sand washing dryer

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/The spiral washing machine can achieve the cleaning effect of sand and stone. The spiral washing machine is equipped with a spiral device,

When the washing machine is working, water should be injected first, and then sand should be added for processing. In this way, the long-term sand washing process will be repeated, res

As a large-scale equipment for sand screening and cleaning, sand washing machine plays an important role in the process

In the process of stone processing, due to the fierce collision and the soil content of stone itself, there will be a certain amount of stone powder and mud powder in the manufactu

The washing machine is of great significance to the engineering quality in the engineering construction. However, when the

The sand washing machine is simple in structure, long in service life, large in tr

Sand washing machine is not only an important equipment for washing artificial sand and natural sand, but also an indispensa

In the production process of the washing machine, th

Copyright 2018 Weifang Zhengbang Heavy Industry Machinery Co., Ltd.Lu ICP prepared16049645-4 business scope; sand washing machine, sand washing equipment, sand washing machinery, Guangdong sand washing machine, spiral sand washing machine, spiral sand washing machine, spiral sand washing machine, wheel bucket sand washing machine, Hainan sand washing equipment, sand separator, sand separator, mixing station sand separator, sand separator, concrete sand separator, Washing machine, washing machine equipment, cylinder washing machine, spiral washing machine, high-speed rail washing machine

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.

manufactured home washers and dryers guide: 9 factors to ensure a successful purchase | manufactured home parts and accessories

manufactured home washers and dryers guide: 9 factors to ensure a successful purchase | manufactured home parts and accessories

Standard full size dryers will range between 7.3 cu. ft. to about 8.3 cu. ft. Also, there are some pretty impressive compact units in the market at about 3.4 cu. ft. and mega-capacity options with large cu. ft of about 9.2 cu. ft.

So, whats the perfect size for your mobile home? For a household with just one or two occupants, and one with minimal garments drying needs (no heavy blankets and stuff), a compact dryer would be the perfect option.

One caution though: dont be distracted with sales pitches and terminologies such as extra compact, super-medium, extra-large and stuff like that, they are never standardized definitions of anything.

You are keen to save as much space as possible because you are in a manufactured home. Thats why you would rather go for stackable machines than stand-alone options each of which will require its own slot.

Some manufacturers offer a pair consisting of a washer and dryer. If you are planning to acquire the dryer and the washer from different manufactures but would like to stack them, first check if they are compatible with each other.

This sounds like a factor to consider rather than a feature to look for in a machine. Nonetheless, the cost of the machine can let you know whether you are acquiring a quality machine or not although thats not always the case.

Another feature to pay attention to is the technology that comes with the machine and general functionality. There are several types of dryers and washers grouped based on technology, how they load, portability, and whether they are combo or not.

These dryers would be great for your home if you are living alone or with another person in a mobile home. It would be a real hustle to find a washer with a cu. ft. rating of 1.0 cu. ft. So, you might want to go slow on the rule of thumb for the following dryers:

This dryer is excellent for small loads and can dry up to 5.5 lbs. of garments in one cycle. The best thing is that it can be mounted on the wall, hence a likable space-saving machine. For proper fabric care, you can choose between two temperature settings.

With a capacity of 1.50 cu. ft. this dryer can dry up to 6.6 lbs. of garments in one cycle. It lets you choose from up to 4 drying temperatures. The classic design with a large round window is one of the things you dont want to miss in a dryer. It comes with a wall mounting kit.

The stainless-steel construction, up to 3 different drying modes, the capacity of 1.8 cu. ft. and weight of 44 lbs. are some of the features that make this dryer great for small mobile homes with up to two occupants.

If you live with the other two people in your home, this is the best class of dryers for you. You can easily find washers with over 1.0 to 2.0 cu. ft. (half the capacity of these dryers). Take a glance at these options:

This dryer can be mounted on the wall, dries up to 13 lbs. of garment load, lets you set up to 3 temperatures for better fabric care, and most importantly, comes with overheat protection features so that you dont scorch your clothes.

These mid-sized dryers are larger than small options but not too big to pose a spacing problem in your compact home. Because of their increased capacity, you will part with more dollars for them compared to their small-sized counterparts weve listed above. They are perfect for a small nuclear family. You will easily find a 2.0 3.0 cu. ft. Washers to accompany them. Check them out:

This dryer comes with an LG sensor that detects when your clothes are dry to cut on power consumption. It is a compact 24 dryer perfect for small spaces. The stainless-steel construction is both durable and corrosion-resistant to protect your garments from rust.

This dryers HE Sensor Dry helps protects your clothes from excessive drying. The best part is that you can monitor the drying progress from your smartphone or tablet via Wi-Fi connection. It provides up to 13 drying cycles.

The 4 cu. ft. capacity is enough for your medium-sized family living in a mobile home. The end-of-Cycle notification system lets you know when the drying process is complete. The stainless-steel construction is corrosion-resistant and protects your clothes from rust.

Unless your household consists of over five members, there is no need for this class of dryers. But, because they are compact to fit in limited spaces and comes with a larger capacity (even though we regard this class to be medium), we felt the need to list the following options:

The small capacity of 6.2 cu. ft. (capable of drying over 20 lbs. of load in one cycle) is all you want in a mobile home with a medium-sized family. Quiet-by-Design technology helps cut the amount of noise produced.

This is one of General Electrics mid-size dryers that comes with the Wrinkle Care Cycle option that tumbles the dryer and prevents the formation of wrinkles on your clothes. The electromechanical controls make it is easy to control even for rookies.

If you are a fan of Whirlpools cutting-edge washing and drying products, you might want to buy this premium porcelain-enamel finished dryer. It comes with 3 cycle sections: Colors/Delicates, Permanent Press, and Cotton/Whites.

Dryers in these classes are either too large for a compact mobile home or come with a capacity that is too large for the typical needs of a family living in a mobile home. For that reason, we will leave them unmentioned.

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