Posted in July 2012

Common failure of the wet ball mill

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Wednesday 11th July 2012, 8:48am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

Wet Ball Mill is the material being broken to smash the key equipment.By feeding, discharging part, turning part, a transmission of the main part.Mill widely used in cement, silicate products, new building materials, refractory materials, fertilizer, black and non-ferrous metal processing and glass ceramic production industry, for all kinds of ores and other materials may be grinding of dry or wet grinding.Ball Mill used for a long time, always more or less appear some problems.Our company based on years of experience for our customers to summarize the common problems in the ball mill.

First, the ball mill anti-blocking, leak-proof basic knowledge:The anti-blocking, we first need to check the sizes of materials and material feeding amount, if the delivery volume overload, can also cause the clogging of import.For the proof, we first check whether the imported seal wear, after a period of time will have leaked, we should timely replacement of packing seal.And we have the entrance position design discharge funnel and pipes, can be timely will leak slurry discharged into the trench.Second, Wet Ball Mill liquid pump speed adjustment:Through debugging during night cyclone station pressure test, to replace the slurry pump belt pulley.In third, ball mill imports and exports effects of abrasive material size:Ball mill control into the limestone particle size, in the scope of design.General Wet Ball Mill feed size of 80% particles of less than 12mm.Regulation of entrance feed mill.General to reduce electricity consumption, mill should be routinely maintained in rated operation conditions, but sometimes as a result of a variety of reasons, the steel ball added is not timely, then according to the ball mill main motor current to reduce properly reduce the feeding quantity, to ensure the qualified pulp particle size.In fourth, the ratio of ball mill to adjust grinding material size:To maintain a reasonable ball loading and the steel ratio.Limestone is on impact, extrusion and milled into slurry, if the ball loading capacity is insufficient, fineness will be difficult to meet the requirements.Running through surveillance of ball mill main motor current to monitor the steel balls loading, if it is found that the current decreased significantly to replenish ball.Ball mill in the first operation when the mass ratio should be according to the design of steel ball.Experience shows, ball supplement in general only the diameter of the largest models, because wear different diameter ball can be included in other types of columns.Can after running for a period of time according to the steel ball wear of ball, generally running 3 months after. Get Mineral Processing,rotary kiln,ball mill From http://www.ballmill8.com

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Properties of the ceramic ball mill

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Wednesday 11th July 2012, 8:47am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

The structure of Ceramic Ball Mill: Ceramic Ball Mill is mainly composed of a driving device, a cylinder body device, feeding device, discharging device and an electrical control device.Ceramic Ball Mill load is large, the power consumption is large, so the ceramic ball mill is usually used between 1 and 2 several hundred watts of power electric motor through a hydraulic coupler to drive the hardened gear reducer, and then by a pair of gears or belt drive the cylinder to rotate, thereby achieving the effect of grinding material.

Ceramic ball mill working principle: the ball mill by feeding department, discharging part, turning part, a transmission part (reducer, small transmission gear, motors, electrical control) and other major parts.Ceramic ball mill has a horizontal cylinder, cylinder by a separator (drill has many small hole sieve) into 3 ~ 4 grinding cavity, each grinding cavity is provided with a certain shape and size of the grinding body, cylinder rotates, the material and grinding body in the friction force and the centrifugal force of cylinder body is lifted to a certain height, then under the action of gravity along a parabolic trajectory falling impact and grind the bottom of the cylinder body is another part of the material, and to produce the axial movement makes the material grinding and mixing.

Ceramic ball mill which belongs to the low-speed heavy load equipment, large loading capacity, starting torque is big, therefore ceramic ball mill is usually used additional starting motor shock initiation or soft starter to start, impact, and started after the completion of operation when the desired torque is reduced, so the energy saving aspect to have the very big space. Get beneficiation,rotary kiln,Mineral Processing From http://www.ballmill8.com

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The difference between Ball Mill and Raymond Mill

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Tuesday 10th July 2012, 1:22am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

Ball Mill materials is being broken, further crush the key equipment. Mill widely used in cement, Portland products, new building materials, refractories, fertilizers, as well as black and non-ferrous metal processing industries such as the production of glass ceramics, various ores and other materials may be grinding of dry or wet grinding.

Mill principle:
The ball mill for the installation of horizontal rotating cylinder, outer edge of which lies Gear, two warehouses, lattice-type ball mill. Feed materials from the device into the compound empty-axis spiral uniform access to the first Mill Wharf, the warehouses have stepped liner or corrugated liner, the contents of different specifications Ball, the centrifugal force will have a rotating cylinder ball to a certain altitude sets, and have severe impact on materials and grinding role. Materials in the first positions to grinding, single-layer at the plate in the second warehouse stores, the warehouses incalculable-liner with a ball, will further polishing materials. Discharge through the grate of powder from plate to complete grinding operations.

Mill structural characteristics:
Feeding this machine by the Department of the Ministry of material, Rotary Department, the Department of transmission (reducer, small transmission gears, motors, electronic control), and other key components. Casting a hollow shaft, lined Looking to the future, casting a rotary gear hobbing processing, cylinder liner wear in incalculable, has good wear resistance. The smooth functioning of the machine, is reliable.

R-type milling machine from the host unit structure, analysis of pipeline installation, blower, according to user needs can be fitted with a broken machine, hoist, electromagnetic Vibrating Feeder, electric motor control components. Materials are needed to crush size, the materials hoist will be sent to storage hopper, to be expected by the vibrating feeder uniform for the mainframe into Raymond Mill grinding room, as when centrifugal rotary role Roll out swinging, press the grinding part of the shovel blade materials to roll grinding and grinding Central, as Roll rolling to achieve the aim of crushing. After grinding the powder material with the circulating air blower into the analysis was conducted at the election, fine through coarse material to re-grinding, qualified powder into the air, finished with the whirlwind set of powder, the powder discharge pipe, which is refined. In Raymond Mill grinding mill indoors due to certain materials in the water, grinding, heat, air-water evaporation, and the pipeline unit interface is not well outside gas inhalation, the cycle of increased pressure to ensure that the mill under negative pressure, the increase in gas flow through the tube into the wind I precipitator was after purification into the atmosphere.

Raymond Mill unit structure features:
One, three-dimensional structure, small footprint, turnkey highly refined powder expected from the block of independent self-production system.

2, refined powder fineness of uniform rate of 99% on screen, it is difficult to other milling equipment available.

3, the Drive installations in confined pulley and gear box, transmission smooth, reliable operation.

4, the important components are used quality steel, wear-resistant performance of wear resistant materials are used, the whole high wear resistance, reliable operation. 5, the electrical system is centralized control, milling plant can be realized no one basic operations and maintenance.

Raymond Mill unit structure features:
1, milling machines used in the process, there should be a fixed custody staff, operators must have a certain level of technology. Mill installed before the operator must conduct the necessary technical training so that they understand the principle of milling machine, familiar with the rules.

2, for the mill to normal, should develop equipment "safe operation of equipment maintenance system" can guarantee long-term security mill operation, a necessary repair tools and grease and corresponding accessories.

3, mill use for a period of time, it should repair, while Roller Mill Central blade repair and replacement of vulnerability, Roller device in use before and after the bolt nut should be carefully examined to see if it is loose, Lubricants and whether adequate.

4, Raymond Mill Roll devices around for more than 500 hours to replace Roll, roll on the roller bearing to the inner cleansing, and replace damaged parts, tools can be manually refueling pumps guns and butter. Get Mineral Processing,rotary kiln,ball mill From http://www.ballmill8.com

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Principle processes of flotation separation of Polymetallic ores

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Tuesday 10th July 2012, 1:22am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

Direct Preferential Flotation
Definition of this method is: separate various helpful minerals in proper order. With its feature of high flexibility, it can adapt the change of ore grade, especially for sulphide ore of high grade. Xilin, Fankou, Lechang lead-zinc dressing plant of our country, and Laisvall lead-zinc dressing plant of Sweden all adopt this method.

Combined Flotation Flowsheet
Firstly, get mixed concentrate through the emersion of all useful minerals in ores; secondly, separate various helpful minerals in sequence from mixed concentrate. These two steps together are called part of amalgamate flotation Flowsheet. This process is suitable for treat raw ores of complex structure, fine embedded grains, and low content of sulfide mineral, which are in close symbiosis relationship. Because this process can simplify process, reduce ores’ over grinding, so as to benefit separation. Almarc Lead-zinc plant of former Soviet Union adopts preferential flotation this process. By using this process, we can get higher index than preferential flotation improve 10% of lead concentrate ore grade and 4.5% of zinc concentrate ore grade, raise the rate of multipurpose utilization from 75.4% to 83.7%, and double labor productivity. Qingchengzi zinc-lead ore dressing plant and Xiaotieshan copper ore dressing plant of our country adopt this process.

Part of Amalgamate Flotation Flowsheet
We can get mixed concentrate by the emersion of two useful minerals in ores together, then separate single concentrate from the mixed concentrate. The two stages together are called part of amalgamate flotation Flowsheet, which is the most widely used process in production. It is quite economical to adopt this process when raw ores contain low-grade nitrogen, copper-lead, copper-zinc, and lead-zinc.

Iso-flotability Flotation Process
According to minerals’ flotability in ores, mineral assemblages of good, medium and worse flotability are separated through flotation separation. Secondly, different helpful minerals are selected out from all mixed concentrates, which is called iso-flotability flotation process. For example, Huangshapinng lead-zinc ore dressing plant of our country, and Zheskaz of former Soviet Union both adopt this process. Get rotary kiln,ball mill,Mineral Processing From http://www.ballmill8.com

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Medium Speed wet milling machine and the relationship between the Ball Mill

Source:
Tuesday 10th July 2012, 1:21am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

So far, the world's medium-speed milling machines are dry law. Hot air carrier that is, separation, sorting products. Therefore in need of a massive and complicated: medium heat generator, fans, vents Central, separator , explosion-proof system (inert gas source), dedusting system, sealing measures and it is difficult to adapt to the high moisture materials, a fine-grained access-class products in the high temperature operating equipment damage and fast, and the situation difficult to control; complete machine too tall. principle but because of movement determined by the grinding efficiency, and in electricity, the cement industry in the milling system is widely used, but no First, wet operations. Therefore, the principle of movement determined by the grinding efficiency has not been fully exploited.

2 and the Mill Although conventional campaign decided by the principle of grinding mill less than the speed, but the wet process is significantly higher than that of dry. Normally, the same conditions wet process Bian Process 30% energy saving.
Because wet (water) by grinding effect, and water is the simplest, cheapest, "aids." Its will to a large extent influence the fragmentation of materials. Adsorbing water because of the solid surface (the activity of a molecule), the surface free energy and the elastic deformation can be reduced, resulting in the weakening bond together to promote and accelerate the materials crack formation and expansion, the reduction of the strength of the materials -- -- This is the famous "out Binchaer effect."
The result: Wet operations for the period to achieve fineness, it can improve product yield, or yield to achieve period, the fracture particles can promote products mill will be more detailed.

3 envisaged, if the mill rate to avoid the disadvantages, while retaining the principle of movement in the rate decisions of the mill grinding efficiency at the same time allow a Wet Ball Mill with water transmission and other election materials and the simplicity of the wet efficient. designed to speed in the wet mill. its effect should be complementary. be wet grinding technology to meet a variety of needs: FGD desulfurization agents such as power plants, coal slurry preparation; while achieving energy conservation, efficiency, energy, environmental protection simple, reliable, the purpose of applicability stronger. This is the speed in the wet grinding birth of the technical background. Get Mineral Processing,rotary kiln,ball mill From http://www.ballmill8.com

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Flotation machine can meet the performance requirements of the flotation process

Source:
Tuesday 10th July 2012, 1:21am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

Flotation Machine can be used to separate nonferrous metal, ferrous metal, heavy metal, nonmetallic mine, chemical material and recycling minerals. Each chute can inhale gas, sink magma, separate. No assiting equipments are required, and Flotation Machine must be levelly installed. Flotation Machine is easy to change the flow chart. The cycling way of magma is very reasonable. Flotation Machine can reduce the impurities to a great extent. There is automatic equipment on the magma surface, easy to adjust. The impeller also owns the upper and lower retroversion blade. The upper one makes the magma cycle upward, while the lower one makes the magma cycle downward.

Flotation machine has many same characteristics with other machines, such as reliable working, wear-resisting, low power consumption, simple structure and low price. It also should have the special requirements like followings to meet the flotation requirements:

1. Well inflatable role: Flotation machine must guarantee a certain of air amount be absorbed or pressed into the ore pulp and disperses in all the slot. For the air can be dispersed more finer and more uniform, the contact between the ore grains and air bubbles will be more so that the flotation efficiency can be higher.

2. Mixing role: Flotation machine should have well mixing role to make the ore grains suspension and distributed in all the slot uniformly. At the same time, the machine can promote the solvation of some hard dissolved agentias, which is in favor of the full function between the agentias and ore grains.

3. Circular flow function: In flotation machine, the circular flow of ore pulp can make more contact between the ore grains and air bubbles. Get Mineral Processing,rotary kiln,beneficiation From http://www.ballmill8.com

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Flotation is widely used for processing all kinds of lode gold ores

Source:
Tuesday 10th July 2012, 1:20am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

In most instances, flotation is used for processing sulfide auriferous ores whose flotability is quite high and the effect is most notable. By flotation, the gold can be enriched to sulfide ore concentrate as much as possible and the abandoned tailings can be got. The ore dressing cost is also quite low. Flotation process can be used to process polymetallic ores, such as gold-copper, gold-lead, gold-antimony, gold-copper-zinc-lead, etc. For this kind of ore, flotation process can effectively select all kinds of auriferous sulfide ore concentrate and realize to achieve the comprehensive utilization of mineral resources. Moreover, patio process or cyanide process can not be used directly to process the undissolved ores and the joint process which contains the flotation to process the undissolved ores.

Certainly, flotation process has boundedness. For the ores with coarse grains, when the gold grains is larger than 0.2mm and the flotation gold is also larger than 0.2mm, the flotation is quite hard to process the gold ores. For the ore stones which is hard to obtain necessary flotation conditions, if the quartz quality gold ores do not have sulfide, after pulp mixing, stable flotation bubbles are hard to be got so the flotation has some difficulties. In the economic indicators. the flotation process needs a large amount of floating agents so the flotation processing cost is higher than gravity separation and patio process. Get ball mill,beneficiation,Mineral Processing From http://www.ballmill8.com

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Cement quarry application

Source:
Tuesday 10th July 2012, 1:20am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

In general, Portland cement is the main production of cement industry. Portland cement is kind of meticulous powder, usually gray, which consists of calcium (from limestone), silicate, aluminate (clay) and ferrite. Limestone is the main raw material of cement production; most factories are located in the vicinity of limestone quarries in order to minimize transportation costs.

Cement Crushing Equipment

Usually we extract raw materials (limestone, shale, silica and pyrite) by blasting or by using cut-off equipment. Raw materials are sent to the crusher to be crushed or hammered into fragments. Usually Primary Crusher is Jaw Crusher while Cone Crusher and Impact Crusher works as secondary crusher.
Cement Mill

In the Raw Mill plant, we use vertical grinding mill and Ball Mill for cement further grinding. At this stage, Vertical Mill works by using the pressure of cylinder leakage to break the materials; ball mill is dependent on the steel ball grinding upon materials. Grinding Equipment works with higher capacity and saves energy greatly by using an electrical automation system which optimizes the grinding process.

Apart in the Raw Mill plant, ball mill is also widely applied in the clinker grinding process. Here the cement clinker is grinded into fine powder together with other raw materials, such as gypsum.
Primary crusher:

For cement primary crushing, we recommend Jaw Crusher to you. With simple structure and high quality, Jaw Crusher works with higher capacity and lower cost.
Secondary crusher:

For cement secondary crushing, you can choose CS Series Cone Crusher or Impact Crusher. Although their working principle is different, both the crushers are widely applied as secondary crushing equipment. You can choose right one according to your requirement. Get rotary kiln,ball mill,ball mill From http://www.ballmill8.com

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Analyze the Steel Type Coal Ball Grinding Mill Faults

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Tuesday 10th July 2012, 1:17am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

1. The little pineapple snaggletooth
In the daily use of Ball Mill, the little pineapple snaggletooth happens most often, the reasons are as follows:
(1). The little pineapple design strength is weak, and the manufacturing quality requirements is relatively low.
(2). The lubricating of the little pineapple is bad, the mesh is bad which lead to localized wear, bubbling, and material quality coming off. The local stress concentration is worsened which speed up the snaggletooth.
(3). Supercharge caused by the too many steel balls added into the Coal Ball Mill in production primary which lead to the coal ball mill electric current reaches to 130A. Decrease the steel ball loading capacity, keeping the current at around 120A. (the current raises 1A with one ton steel ball added,)
2. The little pineapple tooth surface abrasion
The gear wheel surface generally presents bubbling, peeling, scallops, and such corrosive pitting phenomenon. Besides the little pineapple tooth surface temperature is high which makes the coal grinding ball mill gear teeth attrition condition seriously.
The reasons are as follows:
(1). The coal grinding ball mill protection cover sealing is not good. There is no sealing on the association point of activity and inertia between the Coal Mill hollow shaft and shelter which speed up the ash entering to the big pineapple. The preheater of the boiler is the three branch warehouse, with one way the secondary air of the blower, one way the primary air of the primary air fan. As the primary air pressure is over-high, it blows down the ash accumulated from the smoke side carrying by the preheater heating surface and takes it away. The pipeline weld bond of the hot air system is unqualified which leads to serious leakage. The ash then enters to the wheel gear shield and speed up its attrition.
(2) The alignment pin problem: It is regulated that the temperature difference measured along the little cutter teeth width should be no more than 8??, and the highest temperature on the tooth surface should be no more than 100??. Hit the alignment pin in after the intervals between each part is normal. When the temperature difference is more than 8??, raise the bearing end of low temperature. One of the reasons for the ball mill tooth surface attrition is that the alignment pin is not hit due to the great work amount which is also the reason why some individual little cutter teeth surface is high and the two ends temperature difference is relatively large.
It consists of motor, reducer, case, milling device, separator, outlet, coal feeding pipe, loading device, control box and sealing apparatus. The fittings are all of superior performance in the world at present. We ensure good quality and durability of the whole machine.

1) The concrete base weight required is only 3 times of that of other similar machines thus the construction expenses is greatly reduced
2) Small vibration while using and doesn't need shock-absorbing device
3) Large load adjustment scope, so it can run under various environments
4) Can bear very strong explosion pressure
5) The grinding roller adopts new material and new craft, which ensures long service life and low maintenance cost
6) There is gap between the grinding parts; it can start with load or offload. Get ball mill,ball mill,beneficiation From http://www.ballmill8.com

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The basic principle of ore grinding process

Source:
Friday 6th July 2012, 4:48am

One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone.

When the ore grinding machine are rotating in a certain rotate speed, the ore grinding medium in barrel will produce centrifugal force by rotating so that there will be certain friction between ore grinding medium and barrel. The friction will drive the ore grinding medium rotating with the barrel and reach a certain level. When its own gravity (centripetal force of gravity) are larger than centrifugal force, the ore grinding medium will leave the barrel then fall in projectile way. When the medium are falling down, impact force are produced and the grinding medium can crush the ores. At the same time, in the mill operation process, there are sliding phenomenon and extrusion phenomenon that is produced by lining medium to outer medium in the ore grinding medium, which can produce abrasive and extrusion action to ores. So the ores can be ground by combined effect of impact force, grinding force and extrusion pressure of ore grinding medium.

The ore grinding function of ore grinding machine are like the following picture:

Lifting height and motion trail of projectile action of ore grinding medium depend on rotating speed of grinding machine and the filled amount of ore grinding medium. Both the low speed and high speed will have direct influence on the performance of grinding machine. The grinding medium moving condition in three kinds of different working speed are:

1. Grinding machine running in a low speed(pic.a)
The rotating speed is not high so the lifting height of grinding medium is low and the grinding medium will fall to the bottom of barrel along to their own inclined plane for circulating. The medium is in spilling state and has smaller impact. The abrasive and extrusion action are formed by rolling action among mediums. Ball has less grinding action to materials.

2．Grinding machine running in a normal speed(pic.b)
The rotating speed is higher so the lifting height of grinding medium is high and the grinding medium will be up to a certain height with barrel circular motion, then leave the barrel in a certain velocity and do fall down movement along parabolic path. At this time, the grinding medium has high impact and the abrasive and extrusion action will get sufficient exertion. The materials are ground in the most intense level. Most of grinding machines are working in such a ore grinding condition.

3. Centrifugal operation(pic.c)
When the rotating speed of ore grinding machine is enhanced to a limit numerical value, all the grinding medium will do concentric rotation with the barrel and will not fall down, which will be called centrifugal operation. When the medium produces centrifugal operation, the ore grinding action will be lost in theory. So the grinding machine should work in the rotation speed which is below centrifugal operation. Get ball mill,beneficiation,ball mill From http://www.ballmill8.com

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