scientific design silica sand and sugar rotary dryer machine

rotary dryer machine design and working principle - sunco machinery

rotary dryer machine design and working principle - sunco machinery

For evaporating the moisture from the wet raw material, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. The rotary dryer machines has the direct heating type, in direct heating type. Direct heating type rotary dryer machine are used to apply heat / hot air to contact and heat the raw material such as sawdust, wood chips, chicken manure, silica sand, wood shavings, palm fibre, fly ash, etc. If it is not suitable to apply heat direct to heat and dry the raw material, then rotary dryers of indirect heating design can be furnished so that the heated hot gases will not come in direct contact with the wetraw material. Rotary Dryer is a simple, inexpensive unit forreducing the moisture content from the wet material. Several types ofrotary dryer machine design can be applied for drying different kinds of raw material. RotaryDryerMachine Working Principle: Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow therotary dryersmoothly. There is one hot air furnace supply the hot flue gas for therotary dryerusually. The fuel can be waste wood, coal, natural gas, diesel, etc. Therotarydryercylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into therotary dryercilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in therotarydryercylinder body, the lifting plates inside therotary dryercilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials. There is one high pressure induced draft fan is used to suck out the water vapour out of therotarydryerduring the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney. At the end of therotary dryer, using one belt conveyor to transport the dried material into trucks or storage room directly. The rotarydryer seems very simple, but in fact it is one whole drying system, and the drying system should be designed according to: --- The features of raw material, for example the wet sand has surface water which is easier to be dried, but the wood chips has inner water which is more difficult to be dried. ---Initial moisture content(%) of the wet material. ---Output moisture content(%)the dried material needed. ---Bulk density (kg per cubic meter) of the wet material. ---Input capacity (ton per hour). ---Output capacity(ton per hour). ---Fuel Choice such as coal, waste wood, natural gas, diesel, etc. ---End use of the dried product. When the above information are clear, then Sunco Machinery engineers can calculate and design the suitable and reasonablerotary dryer systemfor the customers accordingly. Sketch Map ofRotaryDryerSystem: Rotary Dryer for drying chicken manure: Rotary Drum Dryer for drying Sawdust: RotaryDryer for drying Wood Chips: Rotary Dryer for drying Wood Shavingsin Greece: RotaryDryer for drying Sandin Malaysia: Rotary Dryer for drying slagin Malaysia: For more details ofrotary dryerworking principle, please feel free to contact us: Email:[email protected] Website:http://www.suncomachinery.com/products/drying/rotary-dryer-01.html Tel / WhatsApp:+86-158 3821 4261

Direct heating type rotary dryer machine are used to apply heat / hot air to contact and heat the raw material such as sawdust, wood chips, chicken manure, silica sand, wood shavings, palm fibre, fly ash, etc.

If it is not suitable to apply heat direct to heat and dry the raw material, then rotary dryers of indirect heating design can be furnished so that the heated hot gases will not come in direct contact with the wetraw material.

Rotary Dryer is a simple, inexpensive unit forreducing the moisture content from the wet material. Several types ofrotary dryer machine design can be applied for drying different kinds of raw material.

Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow therotary dryersmoothly.

Therotarydryercylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into therotary dryercilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in therotarydryercylinder body, the lifting plates inside therotary dryercilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials.

There is one high pressure induced draft fan is used to suck out the water vapour out of therotarydryerduring the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney.

rotary drum dryer working principle- sunco machinery

rotary drum dryer working principle- sunco machinery

Rotary Drum Dryer Working Principle: Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow the rotary dryer smoothly. There is one hot air furnace supply the hot flue gas for the rotary dryer usually. The fuel can be waste wood, coal, natural gas, diesel, etc. The rotarydryer cylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into the rotary dryer cilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in the rotarydryer cylinder body, the lifting plates inside the rotary dryer cilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials. There is one high pressure induced draft fan is used to suck out the water vapour out of the rotarydryer during the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney. At the end of the rotary dryer, using one belt conveyor to transport the dried material into trucks or storage room directly. The rotary drum dryer seems very simple, but in fact it is one whole drying system, and the drying system should be designed according to: --- The features of raw material, for example the wet sand has surface water which is easier to be dried, but the wood chips has inner water which is more difficult to be dried. ---Initial moisture content(%) of the wet material. ---Output moisture content(%)the dried material needed. ---Bulk density (kg per cubic meter) of the wet material. ---Input capacity (ton per hour). ---Output capacity(ton per hour). ---Fuel Choice such as coal, waste wood, natural gas, diesel, etc. ---End use of the dried product. When the above information are clear, then Sunco Machinery engineers can calculate and design the suitable and reasonable rotary dryer system for the customers accordingly. Sketch Map of Rotary Drum Dryer System: Rotary Drum Dryer for drying chicken manure: Rotary Drum Dryer for drying Sawdust: Rotary Drum Dryer for drying Wood Chips: Rotary Drum Dryer for drying Wood Shavings in Greece: Rotary Drum Dryer for drying Sand in Malaysia: Rotary Drum Dryer for drying slag in Malaysia: For more details ofrotary drum dryerworking principle, please feel free to contact us: Email:[email protected] Website:http://www.suncomachinery.com/products/drying/rotary-dryer-01.html Tel / WhatsApp:+86-158 3821 4261 YouTube:https://www.youtube.com/watch?v=i2GiO1HLn0A http://www.youtube.com/watch?v=3K_Q819uqlQ&feature=youtu.be https://www.youtube.com/watch?v=yGzcIJ0aFL0 https://www.youtube.com/watch?v=z1knBGM-3TM http://www.youtube.com/watch?v=w6jA_YBLokM https://www.youtube.com/watch?v=sKSfYwgMx_Q https://youtu.be/TujJp8PLMiI http://www.youtube.com/watch?v=AgRgm-9OWBE

Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow the rotary dryer smoothly.

The rotarydryer cylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into the rotary dryer cilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in the rotarydryer cylinder body, the lifting plates inside the rotary dryer cilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials.

There is one high pressure induced draft fan is used to suck out the water vapour out of the rotarydryer during the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney.

sand dryer - sunco machinery

sand dryer - sunco machinery

Sand DryerBrief Description: Sand Dryeris widely used in construction materials, ore dressing, metallurgy, chemical industry, cement industry, etc. Sand Dryer are used for drying all kinds of sand such as river sand, yellow sand, silica sand, quartz sand, pomegranate sand, etc. Sand Dryer mainly consist of rotary drum, carrier roller, lifting boards, hot air furnace, electric control box, etc. Sand Dryer Features: New type rotary drum dryer, the flights structure in the cylinder of sand dryer is more advanced ; Inner temperature is 450-700, discharging temperature <= 60 , can send into storage room directly, and no need cool device; Made of wear resistant manganese plate, 3 to 4 times more hardwearing than ordinary steel plate ; 1/3 of the traditional drum dryer's coal consumption, electricity power saving 40%,standard coal consumption per tondried sand< 16 kg. Wet Sand Input Dried Sand Output Sand Dryer Workflow: Belt Conveyor or bucket elevator transports the wet sand into the hopper which is on the top of sand dryer. Hot air furnace supply the hot air for the sand dryer. Inside the sand dryer's cylinder, there are many flights, and these flights mix the wet sand and hot air sufficiently. The humidity in the wet sand is heated and evaporated into water vapour. At the end of the sand drying plant, there is one high pressure draft fan. Under the function of draft fan, the water vapour goes out of sand dryer in time. During the sand drying process, there is some dust mixed with the water vapour. In the cyclone separator, the dust is separated from the water vapour, and falls down. The dried sand goes out of the sand dryer machine from the outlet as product. Finally we can use one belt conveyor or bucket elevator to send the dry sand into silo or trucks. Fuel for Sand Dryer: Fuel for the heat source can be wood pellets, waste wood, coal, diesel, natural gas, biomass fuel, etc. The users can choose the most suitable fuel according the actual situation such as fuel available, fuel cost, local environment laws, etc. Partial Technical Data of Sand Dryer Machine: Model Processing Capacity Input Moisture Output Moisture MainMotor forSandDryer Coal CalorificValue Feedinlet Temperature 1.5X14M 10-12 17-23% <10% 15 >5500KCAL/KG 70050 1.8X14M 15-18 17-23% <10% 18.5 >5500KCAL/KG 70050 2.0X16M 20-25 17-23% <10% 18.5 >5500KCAL/KG 70050 2.2X18M 25-30 17-23% <10% 22 >5500KCAL/KG 70050 Notice: Any change ofSandDryertechnical data shall not be advised additionally. Sunco Machinerycan design and supply theSand Dryersystem according to the following information specially : 01. Initial moisture content %of wet sand ? 02. Final output moisture content (%) of dry sandneeded ? 03. Input Capacity (ton per hour ) needed ? 04. Prefered fuel such as coal, waste wood, diesel, or natural gas, etc ? 05. Other special requirements if have ? For detail and price of SandDryer, please refer to: Email:[email protected] Mobile / WhatsApp: Video:https://www.youtube.com/watch?v=hRbrEjSZFaA https://www.youtube.com/watch?v=IMF2nE7eAes https://www.youtube.com/watch?v=u1dgBh-JktI https://www.youtube.com/watch?v=eQ-4iNnxekw https://www.youtube.com/watch?v=4RrghfR9PV4 https://www.youtube.com/watch?v=3OkF8nPLuoQ

Sand Dryer are used for drying all kinds of sand such as river sand, yellow sand, silica sand, quartz sand, pomegranate sand, etc. Sand Dryer mainly consist of rotary drum, carrier roller, lifting boards, hot air furnace, electric control box, etc.

Fuel for the heat source can be wood pellets, waste wood, coal, diesel, natural gas, biomass fuel, etc. The users can choose the most suitable fuel according the actual situation such as fuel available, fuel cost, local environment laws, etc.

Model Processing Capacity Input Moisture Output Moisture MainMotor forSandDryer Coal CalorificValue Feedinlet Temperature 1.5X14M 10-12 17-23% <10% 15 >5500KCAL/KG 70050 1.8X14M 15-18 17-23% <10% 18.5 >5500KCAL/KG 70050 2.0X16M 20-25 17-23% <10% 18.5 >5500KCAL/KG 70050 2.2X18M 25-30 17-23% <10% 22 >5500KCAL/KG 70050

silica sand processing & sand washing plant equipment

silica sand processing & sand washing plant equipment

Silica sand low in iron is much in demand for glass, ceramic and pottery use, and for many of these applications clean, white sand is desired. Impurities such as clay slime, iron stain, and heavy minerals including iron oxides, garnet, chromite, zircon, and other accessory minerals must not be present. Chromium, for example, must not be present, even in extremely small amounts, in order for the sand to be acceptable to certain markets. Feldspars and mica are also objectionable. Generally, iron content must be reduced to 0.030% Fe2O3 or less.

Silica sand for making glass, pottery and ceramics must meet rigid specifications and generally standard washing schemes are inadequate for meeting these requirements. Sand for the glass industry must contain not more than 0.03% Fe2O3. Concentrating tables will remove free iron particles but iron stained and middling particles escape gravity methods. Flotation has been very successfully applied in the industry for making very low iron glass sand suitable even for optical requirements.Sub-A Flotation Machines are extensively used in this industry for they give the selectivity desired and are constructed to withstand the corrosive pulp conditions normally encountered (acid circuits) and also the abrasive action of the coarse, granular, slime free washed sand.

The flowsheet illustrates the more common methods of sand beneficiation. Silica may be obtained from sandstone, dry sand deposits and wet sand deposits. Special materials handling methods are applicable in each case.

The silica bearing sandstone must be mined or quarried much in the manner for handling hard rock. The mined ore is reduced by a Jaw Crusher to about 1 size for the average small tonnage operation. For larger scale operations two-stage crushing is advisable.

The crushed ore is reduced to natural sand grain size by Rod Milling. Generally, one pass treatment through the Rod Mill is sufficient. Grinding is done wet at dilutions in excess of normal grinding practice. A Spiral Screen fitted to the mill discharge removes the plus 20 mesh oversize which either goes to waste or is conveyed back to the mill feed for retreatment.

Sand from such deposits is generally loaded into trucks and transported dry to the mill receiving bin. It is then fed on to a vibrating screen with sufficient water to wash the sand through the 20 mesh stainless screen cloth. Water sprays further wash the oversize which goes to waste or for other use. The minus 20 mesh is the product going to further treatment.

The sand and water slurry for one of the three fore-mentioned methods is classified or dewatered. This may be conveniently done by cyclones or by mechanical dewatering classifiers such as the drag, screw, or rake classifiers.

From classification the sand, at 70 to 75% solids, is introduced into a Attrition Scrubber for removal of surface stain from the sand grains. This is done by actual rubbing of the wet sand grains, one against another, in an intensely agitated high density pulp. Most of the work is done among the sand grains not against the rotating propellers.

For this service rubber covered turbine type propellers of special design and pitch are used. Peripheral speed is relatively low, but it is necessary to introduce sufficient power to keep the entire mass in violent movement without any lost motion or splash. The degree of surface filming and iron oxide stain will determine the retention time required in the Scrubber.

The scrubbed sand from the Attrition Machine is diluted with water to 25-30% solids and pumped to a second set of cyclones for further desliming and removal of slimes released in the scrubber. In some cases the sand at this point is down to the required iron oxide specifications by scrubbing only. In this case, the cyclone or classifier sand product becomes final product.

Deslimed sand containing mica, feldspar, and iron bearing heavy minerals can be successfully cleaned to specifications by Sub-A Flotation. Generally this is done in an acid pulp circuit. Conditioning with H2SO4 and iron promoting reagents is most effective at high density, 70-75% solids. To minimize conditioning and assure proper reagentizing a two-stage Heavy Duty Open Conditioner with Rubber Covered Turbine Propellers is used. This unit has two tanks and mechanisms driven from one motor.

The conditioned pulp is diluted with water to 25-30% solids and fed to a Sub-A Flotation Machine especially designed for handling the abrasive, slime free sand. Acid proof construction in most cases is necessary as the pulps may be corrosive from the presence of sulfuric acid. A pH of 2.5-3.0 is common. Wood construction with molded rubber and 304 or 316 stainless steel are the usual materials of construction. In the flotation step the impurity minerals are floated off in a froth product which is diverted to waste. The clean, contaminent-free silica sand discharges from the end of the machine.

The flotation tailing product at 25 to 30% solids contains the clean silica sand. A SRL Pump delivers it to a Dewatering Classifier for final dewatering. A mechanical classifier is generally preferable for this step as the sand can be dewatered down to 15 to 20% moisture content for belt conveying to stock pile or drainage bins. In some cases the sand is pumped directly to drainage bins but in such cases it would be preferable to place a cyclone in the circuit to eliminate the bulk of the water. Sand filters of top feed or horizontal pan design may also be used for more complete water removal on a continuous basis.

Dry grinding to minus 100 or minus 200 mesh is done in Mills with silica or ceramic lining and using flint pebbles or high density ceramic or porcelain balls. This avoids any iron contamination from the grinding media.

In some cases it may be necessary to place high intensity magnetic separators in the circuit ahead of the grinding mill to remove last traces of iron which may escape removal in the wet treatment scrubbing and flotation steps. Iron scale and foreign iron particles are also removed by the magnetic separator.

In general most silica sands can be beneficiated to acceptable specifications by the flowsheet illustrated. Reagent cost for flotation is low, being in the order of 5 to 10 cents per ton of sand treated. If feldspars and mica must also be removed, reagent costs may approach a maximum of 50 cents per ton.

Laboratory test work is advisable to determine the exact treatment steps necessary. Often, attrition scrubbing and desliming will produce very low iron silica sand suitable for the glass trade. Complete batch and pilot plant test facilities are available to test your sand and determine the exact size of equipment required and the most economical reagent combinations.

Silica sand for making glass, pottery and ceramics must meet rigid specifications and generally standard washing schemes are inadequate for meeting these requirements. Sand for the glass industry must contain not more than 0.03% Fe2O3. Concentrating tables will remove free iron particles but iron stained and middling particles escape gravity methods. Flotation has been very successfully applied in the industry for making very low iron glass sand suitable even for optical requirements.

Sub-A Flotation Machines are extensively used in this industry for they give the selectivity desired and are constructed to withstand the corrosive pulp conditions normally encountered (acid circuits) and also the abrasive action of the coarse, granular, slime free washed sand.

The flowsheet illustrated is typical for production of glasssand by flotation. Generally large tonnages are treated, forexample, 30 to 60 tons per hour. Most sand deposits can be handled by means of a dredge and the sand pumped to the treatment plant. Sandstone deposits are also being treated and may require elaborate mining methods, aerial tramways, crushers, and wet grinding. Rod Mills with grate discharges serve for wet grinding to reduce the crushed sandstone to the particle size before the sand grains were cementedtogether in the deposit. Rod milling is replacing the older conventional grinding systems such as edge runner wet mills or Chilean type mills.

Silica sand pumped from the pit is passed over a screen, either stationary, revolving or vibrating type, to remove tramp oversize. The screen undersize is washed and dewatered generally in a spiral type classifier. Sometimes cone, centrifugal and rake type classifiers may also be used for this service. To clean the sand grains it may be necessary to thoroughly scrub the sand in a heavy-duty sand scrubber similar to the Heavy-duty Agitator used for foundry sand scrubbing. This unit is placed ahead of the washing and dewatering step when required. The overflow from the classifier containing the excess water and slimes is considered a waste product. Thickening of the wastes for water reclamation and tailings disposal in some areas may be necessary.

The washed and dewatered sand from the spiral-type classifier is conveyed to a storage bin ahead of the flotation section. It is very important to provide a steady feed to flotation as dilution, reagents and time control determines the efficiency of the process.

Feeding wet sand out of a storage bin at a uniform rate presents a materials handling problem. In some cases the sand can be uniformly fed by means of a belt or vibrating-type feeder. Vibrators on the storage bin may also be necessary to insure uniform movement of the sand to the feeder. In some cases the wet sand is removed from the bin by hydraulic means and pumped to a spiral-type classifier for further dewatering before being conveyed to the next step in the flowsheet.

Conditioning of the sand with reagents is the most critical step in the process. Generally, for greater efficiency, it is necessary to condition at maximum density. It is for this reason the sand must be delivered to the agitators or conditioners with a minimum amount of moisture. High density conditioning at 70 to 75% solids is usually necessary for efficient reagentizing of the impurity minerals so they will float readily when introduced into the flotation machine.

The Heavy-duty Duplex Open-type Conditioner previously developed for phosphate, feldspar, ilmenite, and other non-metallic mineral flotation is ideal for this application. A duplex unit is necessary to provide the proper contact time. Circular wood tanks are used to withstand the acid pulp conditions and the conditioner shafts and propellers are rubber covered for both the abrasive and corrosive action of the sand and reagents.

Reagents are added to the conditioners, part to the first and the balance to the second tank of the duplex unit, generally for flotation of impurities from silica sand. These reagents are fuel oil, sulphuric acid, pine oil, and a petroleum sulfonate. This is on the basis that the impurities are primarily oxides. If iron is present in sulphide form, then a xanthate reagent is necessary to properly activate and float it. The pulp is usually regulated with sulfuric acid to give a pH of 2.5-3.0 for best results through flotation.

A low reagent cost is necessary because of the low value of the clean sand product. It is also necessary to select a combination of reagents which will float a minimum amount of sand in the impurity product. It is desirable to keep the weight recovery in the clean sand product over 95%. Fatty acid reagents and some of the amines have a tendency to float too much of the sand along with the impurities and are therefore usually avoided.

After proper reagentizing at 70 to 75% solids the pulp is diluted to 25 to 30% solids and introduced into the flotation machine for removal of impurities in the froth product. Thepulp is acid, pH 2 .5 to 3.0 and the sand, being granular and slime free, is rapid settling so a definite handling problem is encountered through flotation.

The Sub-A Flotation Machine has been very successful for silica sand flotation because it will efficiently handle the fast settling sand and move it along from cell to cell positively. Aeration, agitation and selectivity due to the quiet upper zone can be carefully regulated to produce the desired separation. The machine is constructed with a wood tank and molded rubber wearing parts to withstand the corrosive action of the acid pulp. Molded rubber conical-type impellers are preferred for this service when handling a coarse, granular, abrasive sand.

Flotation contact time for removal of impurities is usually short. A 4, and preferably a 6 cell, machine is advisable. Cell to cell pulp level control is also desirable. A 6 cell No. 24 (43 x 43) Sub-A Flotation Machine in most cases is adequate for handling 25 to 30 tons of sand per hour. If the impurities are in sulphide form a standard machine with steel tank and molded rubber parts is adequate provided the pulp is not acid. Otherwise acid proof construction is essential.

The flotation tailing product is the clean sand discharging from the end of the flotation machine at 25 to 30% solids and must be dewatered before further processing. Dewatering can be accomplished in a dewatering classifier and then sent to storage or drying. Top feed or horizontal vacuum filters are often used to remove moisture ahead of the dryer. Dry grinding of the sand to meet market requirements for ceramic and pottery use is also a part of the flowsheet in certain cases.

This particular sand was all minus 20 mesh with only a trace minus 200 mesh and 70% plus 65 mesh. Iron impurity was present as oxide and stained silica grains. The plant which was installed as a result of this test work is consistently making over a 95% weight recovery and a product with not over 0.02% Fe2O3 which at times goes as low as 0.01% Fe2O3.

Si02, minimum..99.8 per cent Al2O3, maximum..0.1 percent Fe2O3, maximum..0.02 per cent CaO + MgO, maximum.0.1 percent For certain markets, a maximum of 0.030 per cent Fe2O3 is acceptable.

Natural silica-sand deposits generally contain impurityminerals such as clay, mica, and iron oxide and heavy iron minerals which are not sufficiently removed by washing and gravity concentration. Flotation is often used to remove these impurity minerals to meet market specifications.

Anionic-type reagents, such as fatty acids, are used to float some impurities in alkaline pulp. Cationic-type reagents such as amines or amine acetates are also used with inhibitors such as sulphuric or hydrofluoric acids to float certain impurity minerals and depress the silica.

evolution of the frac sand dryer

evolution of the frac sand dryer

Favorable market conditions have again brought rise to a boom centered around the quartz sand used in the hydraulic fracturing process; rig counts are up and the amount of sand employed per well is the highest its ever been, with one industry expert anticipating 2018 frac sand demand to be 150% higher than 2016 levels.

After washing, the sand is often stockpiled until it is ready for shipment. While stockpiling does allow some of the moisture content in the sand to be reduced, the sand must still be dried to remove the remaining moisture so it can be used as a proppant. For this reason, a drying plant is needed.

The drying plant serves to reduce the moisture content of the sand, as well as to screen the material into the various grades demanded by the market. Depending on the capacity of the plant, one or multiple dryers may be utilized. Material handling equipment such as bucket elevators and conveyors help to move sand through the processing facility.

Two main types of industrial drying systems are commonly employed in frac sand drying: rotary dryers and fluid bed dryers. While there has been some disagreement over which type of dryer serves the application best, the industry appears to be settling on rotary dryers, and for good reason; rotary dryers have proven to be the prevailing choice for a number of advantages they offer over their fluid bed counterparts:

One of the primary reasons why rotary dryers are chosen for frac sand is their tolerance to variance in the feedstock, which is often a given when it comes to frac sand. Frac sand fed to the dryer covers a range of particle sizes and can vary in moisture content.

Rotary dryers provide a uniform drying solution, despite such variance, while fluid bed dryers are highly sensitive to changes in feedstock, requiring a uniform feedstock to maintain efficient operation.

Capable of processing in excess of 200 TPH, rotary dryers are also the preferred choice in frac sand drying because they offer a high throughput. In an industry where production capacity is critical, a high capacity dryer is an obvious choice.

The overall concept of drying in the frac sand industry has changed as well; what was once an industry that favored low costs over design and durability, the frac sand industry has evolved to meet the changing needs of the market.

While some manufacturers use a larger diameter drum to accommodate a slower airflow velocity, thereby reducing the amount of carryover, the larger the drum diameter, the higher the cost of the equipment.

FEECO utilizes a smaller drum diameter, allowing us to increase airflow velocity through the drum, which in turn maximizes efficiency. However, with increased airflow comes a risk of entrainment. By utilizing an oversize discharge hood (knockout chamber), FEECO is able to use maximum airflow, while minimizing carryover, resulting in a process that is both high capacity and high efficiency. The use of a smaller diameter drum also substantially reduces the cost of the system.

Along with reduced carryover comes reduced dust and mitigation of its associated issues. The ability to minimize dust on-site is becoming increasingly critical, as regulations around dust control tighten. In addition to minimizing dust from carryover, dust can be further reduced through the selection of a proper seal between the rotating drum and the discharge breeching.

Combustion chambers have been implemented to maintain product integrity. The use of a combustion chamber prevents the burner flame from coming into direct contact with the product. When working with frac sand, this avoids breakdown of the product, which can occur if critical breakdown temperature were to be reached as a result of direct contact between the material and the flame.

The abrasive characteristics of frac sand, combined with high capacities, require a drying system designed to withstand such aggressive demands. By utilizing higher grade materials in the design of the unit, frac sand dryers can last reliably for years to come.

Its important to note that this harsh processing environment will also influence the design of frac sand handling equipment. Bucket elevators and conveyor systems will require a heavy-duty design to withstand the demands of handling frac sand.

While flights have always been used in frac sand dryers, flight design and pattern has become more customized to drying frac sand. Advancing flights are often used at the inlet of the dryer to help move sand into the dryer. Flights can also be bolted in for easy replacement when they become worn out.

Throughout the evolution of the frac sand industry, the frac sand dryer has become a cornerstone of processing. This has resulted in the move away from commodity dryers and toward systems engineered around the characteristics of frac sand. As we again approach a boom for the prized sand pumped down hydraulic fracturing wells, producers are looking for high quality dryers that can meet the demanding needs of the industry, while still lasting reliably for years to come.

FEECO provides custom rotary dryers and material handling equipment to the frac sand industry. All of our equipment is designed around the specifications of frac sand to ensure an efficient solution built for longevity. For more information on our custom rotary dryers or material handling equipment, contact us today!

used sand dryer for sale. huarui equipment & more | machinio

used sand dryer for sale. huarui equipment & more | machinio

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Product Features 1. Flexible Operation The operating parameters can be changed according to the nature of the material, and the stable material curtain makes the heat exchange more sufficient. 2. Various Drying M...

Product Features 1. Flexible Operation The operating parameters can be changed according to the nature of the material, and the stable material curtain makes the heat exchange more sufficient. 2. Various Drying M...

Usage: This machine is suitable for heating. The heating method uses up and down heating, dual use of coal and electricity. Stainless steel chain plate structure is inside of the machine. Oven chain, curtain rods...

Rotary dryer is used of drying sand, coal, sludge, coal slurry, brown coal, fly ash, gypsum, clay, kaolin, grain(corn, wheat),mineral powder, slag, iron powder, mill scale, sawdust/woodchips, chicken manure, feed...

Three Cylinder Silica Sea River Quartz Yellow Sand Dryer Equipment Product Description 1.Three pass river sand drum rotary dryer adopts the latest European energy saving technology,clamp type structure. 2. Intern...

Industrial silica sand Browncoal wood sawdust rotary drum dryer machine, three cylinders drum dryer price Baichy three drum dryer three cylinder dryer for hot sale -- Introduction Three-cylinder rotary dryer is m...

Sand dryer rotary iron ore dryer Product Description The tumble dryer has large processing capacity, low fuel consumption, and dry Drying costs are low. The dryer has the characteristics of high temperature resis...

Briefintroduction: 1, Application: The machine is for wool washing, remove fat, sweat, grass and sand. It's rather first selection for raw wool washing machine. 2,Whole equipment list : 1 . B031-152 Wool feeding...

Product Description Product Application: Since sand with lower water content is well needed and sold in the market, we developed a new series of dewatering screen. The TS dewatering screen is mainly used for coar...

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