peneura of molher cement mill

grate ball mill/grate type ball mill/grate ball milling machine--zhengzhou bobang heavy industry machinery co.,ltd

grate ball mill/grate type ball mill/grate ball milling machine--zhengzhou bobang heavy industry machinery co.,ltd

1. Grate liner, 2. Bearing inner cover, 3. Hollow shaft 4.dustpan shape liner 5.central liner, 6. Rib 7. Wedge block. The grate ball mill is usually used in the first segment of the two stages, or place of discharging the rough ore. The grate ball mill is roughly composed of the cylinder, cylinder liner,big gear ring, discharging grate,and ore feeding device. Except there is a discharging grate plate installed at the discharging end, all the other is similar with the overflow ball mill. The grate ball mill discharging cover head and grate plate have the structure as the drawing: grate liner, bearing inner cover, hollow shaft, dustpan liner, central liner, rib and wedge block. In the head cover of the hollow shaft of the discharging end, it has bearing inner cover and discharging grate installed and the later is made from central liner, grate liner and dustpan liner etc. There are eight radial rib casted on the inner wall of the head cover, which divide the head cover into 8 fan rooms. There installed the dustpan liner inside each fan shape room, with the bolt fixed on the end cover. Finally the grate plate are installed on each fan room shaped by the dustpan liner. The grate liner has two kinds of structure: one is the group formed by two pcs, pressed by the wedge block, which get fixed tightly on head cover with the bolt getting through the rib. The central part are supported by the central liner to prevent them from declining and dropping off. The other kind is get two pcs into one block, fixing with bolt directly. The central liner is star shape, formed by two block, tightened on the rib with the bolt.The hole on the grate liner is arranged at inclining direction. The wideth of the hole is getting bigger gradually to the discharging end, which can prevent the slurry from regorging and rough granularity from blocking. The slurry flow into the fan shape room through the hole on the grate plate from the lower part of the discharging end, and get passed up to the upper part along the cylinder rotating and discharged off the hole path. The hollow shaft neck has the grinding proof inner cover, with one end made of trumpet shape blade to lead the slurry to flow out of the mill.As the slurry in this kind of mill is discharged through the grate plate, it is called the grate ball mill.

The characteristics of the grate ball mill: 1. The fast discharging speed, and high production capacity( 20~30% higher than overflow type, and so does power saving ) 2. Less overgrinding phenomena--discharging at the lower horizontal level. Less slurry stored inside. And easy to discharge the grinded fine particles in time. 3. Much ball loading- not only big ball but also small ball, for the grate fence. Having the good grinding condition. 4. The complicated structure than overflow---multi grate fence, taking certain room and reducing the effective volume. The grinded material are carried by the discharging grate plate in the grate ball mill, which has the compelling function, and fast discharging speed. The slurry level in the discharging end is lower than that of the lowest mother line level in the discharged shaft neck, so it is called the ore low level discharging. The mill has height difference from the material input end to the output end, and the slurry get through the mill with faster speed, discharging the grinded particles in time. As little slurry stored in the grate type ball mill and blocked by the grate plate, the mill can load more balls, easy to load the small ball. When the steel ball dropping off, the striking function lessened by the slurry resistence will be less. These causes make the production capacity and efficiency is higher than that of the overflow mill, with rough granularity finished product and not easy to get overcrushing.

Model Shell Sizemm Effective Volumem3 Grinding Media Weightt Rotate Speedr/min PowerKw Discharge Size Outputt/h Weightt Remark DiaLength GMQY1530 15003000 4.0 8.4 27.6 75 0.8-0.074 11-2.6 15.1 380V GMQY1535 15003500 4.6 10 27.6 75-90 0.8-0.074 13.2-3.0 16.0 380V GMQY1830 18003000 6.5 12 25.3 110-132 0.8-0.074 20-4.5 27.8 380V GMQY1835 18003500 7.58 15 25.3 132-160 0.8-0.074 23-5.0 29.7 380V GMQY1840 18004000 8.65 16 25.3 160-185 0.8-0.074 25-6.0 32.6 380V GMQY1845 18004500 9.75 18 25.3 185-210 0.8-0.074 28-6.8 35.5 380V GMQY2122 21002200 6.7 14.7 23.8 160 0.8-0.074 22-5.0 42.9 380V GMQY2130 21003000 9.2 17 23.8 185 0.8-0.074 25-5.8 46.5 380V GMQY2136 21003600 11 19 23.8 210 0.8-0.074 28-6.0 48.0 380V GMQY2140 21004000 12.2 20.5 23.8 220 0.8-0.074 30-7.0 49.9 380V GMQY2145 21004500 13.8 22 23.8 250 0.8-0.074 34-8.0 51.3 380V GMQY2424 24002400 9.8 18.8 22.8 210 0.8-0.074 30-6.2 54.0 380V GMQY2430 24003000 12.2 23 22.8 250 0.8-0.074 34-6.6 57.0 380V GMQY2436 24003600 14.6 25 22.8 280 0.8-0.074 40.5-7.9 59.68 380V GMQY2440 24004000 16.2 28 22.8 315 0.8-0.074 45-8.7 62.9 380V GMQY2445 24004500 18.2 31 22.8 355 0.8-0.074 50-9.8 65.5 380V GMQY2721 27002100 10.7 20 21.7 280 3.0-0.074 76-6.0 63.5 6-10KV GMQY2727 27002700 13.8 25.5 21.7 315 3.0-0.074 98-7.8 66.7 6-10KV GMQY2730 27003000 15.3 28.0 21.7 355 3.0-0.074 108-8.8 75.6 6-10KV GMQY2736 27003600 18.4 34 21.7 355-400 3.0-0.074 130-10.5 81.8 6-10KV GMQY2740 27004000 20.5 37 21.7 400-450 3.0-0.074 144-11.5 83.5 6-10KV GMQY2745 27004500 23.0 42.5 21.7 500 3.0-0.074 180-13 87.6 6-10KV GMQY3231 32003100 22.65 22.65 18.6 450 3.0-0.074 164-14.4 127 6-10KV GMQY3236 32003600 26.20 26.2 18.6 500 3.0-0.074 171-17.1 131.0 6-10KV GMQY3240 32004000 29.2 29.2 18.6 560 3.0-0.074 190-20 135.0 6-10KV GMQY3245 32004500 32.8 61.0 18.6 630 3.0-0.074 228-22 139.0 6-10KV GMQY3254 32005400 39.3 73.0 18.6 710 3.0-0.074 270-26 148.7 6-10KV GMQY3640 36004000 35.6 67 17.3 710 3.0-0.074 210-20 165 6-10KV GMQY3645 36004500 40.8 76 17.3 800-1000 3.0-0.074 233-26 170 6-10KV GMQY3650 36005000 45.3 86 17.3 1120 3.0-0.074 260-31.5 180 6-10KV GMQY3660 36006000 54.4 102 17.3 1250 3.0-0.074 280-34 200 6-10KV GMQY3685 36008500 79.0 131 17.3 1500 3.0-0.074 400-45 240 6-10KV

Copyright Zhengzhou Bobang Heavy Industry Machinery Co.,Ltd. E-mail : [email protected] Tel0086- 86656957 Address No.11 West Construction Road, Zhongyuan District,Zhengzhou City,Henan Province, China

blended cements with limestone | gcp applied technologies

blended cements with limestone | gcp applied technologies

Portland Limestone cement has distinct advantages in terms of performance, controlling strength, reducing cost, and enhancing sustainability. There are international standards that regulate the use of Portland Limestone cement. For example, the European Standard EN 197-1 permits a number of cement types as well as setting criteria for the limestone itself. Typically the limestone needs to have CaCO3 purity >75%, have a limited clay content (methylene blue test not exceeding 1.20g/100g), and total organic carbon not exceeding 0.20% by mass for "LL" and 0.50% for "L".

The percentage of limestone used has a significant impact on the cement grinding process and ultimately on the final cement performance characteristics. It affects the grinding efficiency of the clinker, mill retention, mill internals coating, moisture input, grinding temperature, and cement flowability. Limestone also generally produces a wider particle size distribution (PSD) for the cement, with both a higher Blaine value and higher residues. Each additional 1% of limestone typically increases the Blaine SSA by 5-8 m2/kg (constant mill kWh/t).

Higher Blaine SSA and wider particle size distribution (PSD) reduces dry flowability, and this tends to be more difficult for limestone cements. It increases material filling in the mill, which is detrimental to the grinding efficiency when it is above the optimum value of void filling. The high fineness and increased moisture input increase agglomeration and coating, also leading to a negative impact on grinding efficiency.

The performance of the cement is strongly impacted by the quantity of the limestone. A wider PSD reduces paste water demand and higher fineness reduces the tendency for bleed water. However, the most noticeable effect concerns strength development, resulting from both the substitution of clinker and the effects from the PSD. The amount that the limestone reduces strength depends on the limestone percentage, the effects on PSD, cement fineness, and any cement additive present.

Cement additives can make an important contribution to grinding efficiency to counter the negative impact on flowability, void filling, coating, and PSD. Given that strength is substantially reduced in these situations, selecting the appropriate quality-improving additive is critical. Typically, there is a strong requirement to improve 28-day strength; additives based on higher alkanolamines are often the most appropriate.

Some improvements in 28-day strength are possible through finer grinding, accomplished by reducing mill output. However, the strength reduction due to higher limestone levels cannot be fully offset by a reduction in mill output alone.

Choosing the right cement additive has a marked impact on the percentage of limestone possible to achieve the target performance. For a typical 5MPa gain from the additive, it would be possible to increase the limestone by approximately 7% for the same mill output. Identifying the correct cement additive has more of an impact on limestone cement production than the effect of the mill output. Importantly, it is also usually more economically and logistically advantageous.

flsmidth | history

flsmidth | history

FLSmidth's historic head office at Vigerslev All in Copenhagen's Valby district has fallen behind the times, and an agreement signed between FLSmidth and ATP Real Estate marks the first step towards a new, modern campus on the site.

In 2017, the FLSmidth Donation Fund gave students at the Instituto Politcnico Nacional (IPN), which is located in one of the most important mining zones in Mexico, access to state-of-the-art laboratory mining equipment. Besides this equipment, the FLSmidth Donation Fund also supports young scientists and various global and local charities.

FLSmidth and Kleemann, part of Wirtgen Group, signed a long-term cooperation agreement on supply of cone crushers for mobile applications in the construction industry. The agreement unites FLSmidth's technology leadership within cone crushers with Kleemann's leading position in the mobile crushing in the construction and aggregate industry, and provided a unique opportunity for FLSmidth to expand into adjacent industries.

2015 also saw FLSmidth take a big step in terms of digitalization, as the company joined forces with GE, leader in Industrial Internet of Things (IIoT) to maximize the potential of connected equipment units, helping the cement and mining industry to increase productivity.

Proving FLSmidths leadership in engineering and solutions for the mining industry, we won the prestigious global Top 100 award for our Rapid Oxidative Leach process at this years R&D 100sin Wachington DC.

Potagua A/S, FLSmidth's principal owner, who represented the founding families, announced at the end of 2001 that it did not consider itself the ideal majority shareholder of the Group in the long term. It proposed that a new Board of Directors be elected comprising mainly professional business people to steer the transition from conglomerate to core businesses.

In response to the increased consolidation and globalization among the Groups customers, and to improve coordination, cost efficiency and flexibility among the Groups companies, the new Board created a new organizational structure with defined global functions. As part of that endeavour, the business operations of F.L.Smidth & Co. A/S and Fuller Company were integrated into one global business unit, with both companies remaining fully operational to serve the global cement industry. As part of that initiative, Fuller Company changed its name to F.L. Smidth Inc. and F.L.Smidth & Co. A/S changed its name to FLSmidth A/S.

Bhagwati Designs, an Indian engineering consultancy; MVT, a supplier of bulk material handling equipment; and Pfaff aqs, a German manufacturer of automatic sampling and sample handling equipment were acquired and joined the Group's cement engineering business.

In the last part of the 20th century, FLSmidth retains its market share in the cement industry by developing new and enhancing existing technologies while at the same time diversifying into other business areas.

The FLS Group acquired Fuller Company and established the F.L.Smidth-Fuller Engineering Group. After the acquisition, two separate minerals processing divisions were formed: Fuller MPD and FLSmidth MPD.

In 1997, the two divisions, Fuller MPD and FLSmidth MPD, were merged into one single company, FFE Minerals. Moreover, Valby Machinery Works was separated from F.L.Smidth & Co. to merge with MAAG Gear, now 80 per cent owned by the F.L.Smidth-Fuller Engineering Group.

The worldwide economic recession that began in the early 1980s caused a slump in the cement machinery market. Tenders fell to less than half, competition among the machinery suppliers became fierce, and prices and profits plummeted.

Nevertheless, F.L.Smidth managed to retain its market share, in some areas even increase it. The organisation was streamlined and measures were taken to develop technologies and products and to enhance service and sales in the Company's main market: the cement industry.

Against this background, FLSmidth introduced the ATOX vertical mill. The mill combined the grinding, separation and drying processes into a single unit. To date, FLSmidth has sold more than 300 ATOX mills.

FLSmidth's cement business was widened at an early stage to include a number of related activities. The Group's involvement in such diverse lines of business as machinery manufacture, packaging production and insurance was prompted by a desire to ensure satisfactory quality and reliability of sub-suppliers and products.

Through acquisitions, non-core activities had gradually grown to two-thirds of Group sales. It was therefore decided to form a new parent company, FLS Industries A/S, to control the some 125 companies in the Group.

The seven sectors mirrored the strategy in place at the time of investing in areas where the Group had a strong position and selling off companies to buyers who had a better opportunity to further develop the activities.

FLSmidth & Co. diversified into new markets in the minerals industry including pyro processing technologies for pulp and paper production, lime and dolomite calcination and metallurgical beneficiation.

At the end of the War, FLSmidth was well placed to penetrate new markets. A number of technical innovations were launched, including the TIRAX mill, the UNAX cooler and the SYMETRO gear. These machines and products greatly streamlined production at cement plants. They boosted FLSmidth's position as an international market leader.

The firm made good progress. It specialized in machinery for the brick and tile industry and received its first major contract for the design of a Danish tile works based on new burning and drying techniques that made it possible to operate a tile works all year round.

Two engineers, Poul Larsen and Alexander Foss, who had been working for the firm for a couple of years, became partners in the business, which changed name to F.L.Smidth & Co. Through its involvement in the tile and brick making industry, the firm had made contacts in the cement industry and was awarded a contract for a cement plant near Limhamn in Sweden. The staff continued to grow and the business moved to Vestergade in central Copenhagen, which remained its location until 1956 when it moved to the present headquarters at Valby.

F.L.Smidth & Co. established the Aalborg Portland Cement Plant in Denmark, which enabled the firm to make thorough studies of all stages of the cement manufacturing process and become a leader in technical innovation. The plant also served as a test facility for new machinery.

F.L.Smidth & Co. opened an office in London. In the following years, offices opened in Paris (1893), New York (1895), Berlin (1901) and other cities. Within a short time span, F.L.Smidth & Co. managed to become a worldwide business.

The firm acquired the rights to a new mill type, the tube mill, from the French/Danish inventor. After being thoroughly redesigned and refined, the tube mill influenced the cement industry in the coming century. After being redesigned, the tube mill became so popular that it was sold all over the world already before the turn of the century.

In the USA, the cement industry used oil to heat the more flexible and greater capacity horizontal rotary kilns. After considerable redesign work, F.L.Smidth introduced the coal-fired rotary kiln on the European market. Together, the tube mill and the rotary kiln revolutionized cement production. F.L.Smidth has since sold over 2000 units of the rotary kiln worldwide, the design of which is continuously being improved to attain ever-higher levels of heat and energy efficiency as well as productivity.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

55 gallon drum vertical axis wind turbine (vawt) : 7 steps - instructables

55 gallon drum vertical axis wind turbine (vawt) : 7 steps - instructables

Take time to carefully draw bisecting lines on the barrels.Draw lines on them using a compass and straight edge. If you don't have a big Harbor Freight compass like mine, you can use a string and a Sharpie as a compass. Don't cut across the spouts because the plastic is very thick there.

Now cut the barrels in half. Cut the barrel with a hand saw or power saw (be careful not to hurt yourself during assembly).When cutting the long sides of the barrels, make sure the barrel won't roll while cutting. I use a jig below but you can trap the barrel against a wall with a heavy object such as a tree stump.

Here we join the two halves.Position barrel halves with 9" overlap and tape using duct tape to hold.Tape a flange spacer into place.Drill at least four quarter inch holes through the barrels using the flange spacer as your guide.Put in some 1/4" nuts and bolts to hold the barrels more firmly.Drill large hole through barrels using the flange spacer as your guide (use a 4 1/2 " hole saw, coping saw, or rotozip).

Using a closet flange on the inside and a flange spacer on the outside, sandwich the barrel halves together.Repeat the process until all barrels are solidly connected.Pound the PVC pipe through all of the barrel sets making keeping the barrel sets at 90 degrees apart.Then drill through the closet flanges into the pipe and use sheet metal screws to keep the barrels in place (or clean and glue instead).

Now fabricate bearings. Here we use "Lazy Susan" bearings to support the turbine.Now put together your bearing assemblies.Using a closet flange, Lazy-Susan bearing, and wood, put together two bearing assemblies as shown.The square pieces of wood are taken from the 1"x8" plank. 4 1/2" holes are drilled through the center. Make sure that you use a center punch to mark the holes for the lazy suzan. the closet flange, and for the center point of the 4 1/2" inch hole to drill before you do any drilling or you won't be able to center the lazy susan around the hole which is very important to avoid precession. After holes are drilled varnish the wood with spar varnish.Follow the instructions on the Lazy Susan for attaching to the wood.Finally, mount a closet flange on the assembly. Drill a hole through the closet flange as shown below and place a wood or sheet metal screw in the hole (but not protruding into the center).Later the screw will attach to the pvc pipe.Screws attaching the bearing to the wood should be through bolted. If countersinking is needed, drill a countersink hole in the wood.

For the price of materials and amount of time it took to build that, that's pretty impresive. The solar panels I'm considering building would end up being something around $40 for 14 watts I think it was.

I would think over time the ball bearings would be damaged due to heat caused by friction. I would suggest a small grease gun with high temp wheel bearing grease would solve the problem and make it quieter. Someone may have already suggested that though. Great Job!

i saw a scrapped hard drive used as a bearing or a harbor freight magnetic nut and bolt holder two for the bottom and two for the top north and south magnet repel each other thats your frictionless bearing

One option might be to not use a lazy susan at all (they're not designed for a heavy duty cycle, really) but to recycle an automobile brake disk or drum as the load bearing device. They're extremely strong, have low-friction tapered roller bearings, very strong mounting studs, are quiet, last virtually forever, and are dirt cheap at any auto wrecking yard. They're also very well balanced and, due to the mass of the disk or the drum, add a bit of a flywheel effect to the rotating turbine. Only drawback I can think of would be that you'd need a bit of welding to anchor it to a bit of steel plate. You could also include an engine's countershaft pully to allow connection to the alternator via an old fan belt. Reuse, recycle :)

I found Mother Earth News thru a friend back in the early 80's and am always on the lookout for the older issues, the newer glossy paper style just isnt the same and seems more corporate than geared to to earthers, but thats just me so... Really nice ible but Id like to see more info on the alternator/generator, how is it hooked up, how many batteries does it keep charged

I'm just charging one marine battery at the moment using a sunforce charge controller which is designed for solar panels, not wind turbines. I am going to grid tie this before winter hits along with several other barrel turbines to help offset my electrical bill. At that point I will make another instructable for the DIY grid tie.

Don't the "Lazy Suzans" keep you awake at night? And couldn't you drive the generator with a v-belt?A fair sized pulley for mounting on the turbine can be had at the hardware store for a lot less than the cost of the gears.

the 10 best restaurants in fort mill - updated july 2021 - tripadvisor

the 10 best restaurants in fort mill - updated july 2021 - tripadvisor

This is the version of our website addressed to speakers of English in the United States. If you are a resident of another country or region, please select the appropriate version of Tripadvisor for your country or region in the drop-down menu. more

Related Equipments