The structure of a wet ball mill, the difference between dry grinding and wet grinding of a ball mil

The ball mill is mainly composed of the following parts:

1 Combined feeder for feeding.

2. For the cylinder part, there are manholes on the cylinder for overhauling and replacing the lining plate of the cylinder.

3 Discharge section. It is used by the ball mill to discharge qualified products.

4 Main bearing section.

5 Transmission parts.

According to the needs of the process, the mill is divided into left-hand and right-hand rotation, and the supply is according to the order contract.

Wet ball mill structure composition:

1.Mill barrel: The mill barrel of the wet ball mill is composed of a cylinder made of steel plate coil and two manholes with a manhole frame, the parts at both ends of the cylinder are all machined, and the holes on the cylinder are drilled to fix the lining of the mill barrel.

2.End caps and trunnions: Mill inlet and outlet end caps are designed and manufactured by castings, and are connected to the mill barrel with bolts.

The inlet and outlet end caps are designed with complete hollow shafts. The hollow shaft of the inlet end cover is designed as a fixed support, and the hollow shaft of the outlet end cover is designed as a traveling support.

3.Main bearing: The bearing is mounted on the hollow shaft of the mill end cover and is held in the mounting position by means of a pressure ring, and the bearing seat is made of carbon steel welding.

4.Base: The main bearing housing, main gearbox and main drive motor are all mounted on the base of the wet ball mill, the base is equipped with adjustment bolts for easy adjustment, and all anchor bolts are included in the base range.

5.Feeding section: The mill feeding system consists of an inlet chute lined with wear-resistant material and a bearing seat and base to support its weight.

1. The structure of the equipment is differentThe discharge port of the dry ball mill is straight cylindrical, and there is also an induced air device to remove dust; The discharge port of the wet ball mill is flared and has a built-in spiral device for easy discharge. Most of the wet ball mills sold on the market have high grinding fineness and good beneficiation effect.

2. The working principle is differentThe dry ball mill is a cylindrical rotating device, with an outer edge gear drive, two bins, and a lattice type ball mill. The material enters the first bin of the mill evenly through the feeding hollow shaft spiral by the feeding device.

The wet ball mill is that the liquid medium needs to be added during the grinding process, and the grinding concentration must be properly controlled. The amount of water added is generally determined according to the use of the mud, the amount of clay used in the formula and the amount of water absorption value of the clay. The material is gradually crushed under the action of impact and abrasion.

3. The applicable conditions are differentWhen dry grinding, due to the design of the cylinder, sometimes a dead angle will be formed, and some materials in the dead angle can not be milled by balls, but wet grinding also has a weakness compared with dry grinding, that is, the powder after wet grinding should be dried to remove water or other liquid media, so it will increase energy consumption and cost, and cement can not be wet grinding.

Precautions for the use of ball mills.

The ball mill must be replaced with a lubricating oil after the first use and continuous rotation for one month, when all the lubricating oil is removed, the ball mill is thoroughly cleaned, and then the new lubricating oil is replaced. In subsequent use, the ball mill should be guaranteed to change the lubricating oil every six months of operation.

When the ball mill is running, the temperature of the lubricating oil of the main bearing, the transmission shaft and the reducer should be kept below 55 degrees Celsius, and the maximum temperature should not exceed 60 degrees Celsius, otherwise the ball mill should be stopped and inspected in detail.

The ball mill is the key equipment for crushing the material after it is crushed. It is widely used in cement, Portland products, new building materials, refractory materials, chemical fertilizers, black and non-ferrous metal beneficiation and glass ceramics and other production industries, dry or wet grinding of various ores and other grinding materials.

The structure of dry ball mill and wet mill is composed of feeding department, discharging department, rotary department, transmission part (reducer, small transmission gear, motor, electronic control) and other main parts.

The difference between the structure of dry ball mill and wet ball mill: the discharge port of dry ball mill is straight cylinder, and there is also an induced air device to discharge dust. The discharge port of the wet ball mill is flared and has a built-in spiral device for easy discharge.

Most of the ball mills sold on the market are wet ball mills, and the wet ball mills have high grinding fineness and good beneficiation effect.

Working principle of dry ball mill: This machine is a horizontal cylindrical rotating device, outer edge gear transmission, two-bin, lattice type ball mill. The material enters the first bin of the mill uniformly by the feeding device through the feed hollow shaft spiral, which has a stepped lining plate or corrugated lining plate, which is equipped with steel balls of different specifications, and the cylinder rotates to produce centrifugal force to bring the steel balls to a certain height and fall, which has a heavy impact and grinding effect on the materials.

After the material reaches coarse grinding in the first bin, it enters the second bin through a single-layer bin plate, which is inlaid with a flat lining plate and has a steel ball in it, and the material is further ground. The powder is discharged through the discharge grate to complete the grinding operation.

Wet ball mills work on essentially the same principle. It is composed of horizontal simplified body, inlet and outlet hollow shaft and grinding head and other parts, the simplified body is a long cylinder, the cylinder is equipped with a grinding body, the cylinder is made of steel plate, there is a manganese steel lining plate and the simplified body is fixed, the grinding body is generally a steel ball, and is loaded into the cylinder according to different diameters and a certain proportion, and the grinding body can also be used in steel sections. According to the particle size of the grinding material to be selected, the material is loaded into the cylinder by the hollow shaft at the feed end of the mill, when the ball mill is simply rotated, the grinding body is taken away by the cylinder due to the action of inertia and centrifugal force, the effect of friction force, so that it is taken away by the cylinder on the lining plate of the cylinder near it, when it is brought to a certain height, it is thrown down due to its own gravity, and the falling grinding body crushes the material in the cylinder like a projectile to complete the grinding operation.

Cofax Ball Mill Liner Thematic Network" Friendly Answer.

The difference between dry grinding and wet grinding in a ball mill is one with water and one without water.

Shandong Huamin Steel Ball Co., Ltd., ** ball mill with ball - rod mill with rod - Manager Liu.

Mobile phone 139 plus 5310 plus 7473

Generally speaking, normal ball mill wet grinding means that when the material enters the mill, it will complete a certain amount of grinding under the interaction between the abrasive medium and the abrasive itself, and meet the grinding needs of customers. When dealing with ores with high moisture content and argillaceous content, the use of wet ball mills is highly efficient. The agglomerate ball is ground into fine particles, so that the barren material and the plastic material are mixed and mixed evenly, and wet grinding is selected when grinding.

The dry grinding does not need to add water in the processing process, and the material must be dry, when the material has been grinded through a series of grinding and meets the requirements, it will be brought out by the air flow pumped out of the cylinder. For some materials that will react when exposed to water, affecting the quality of the finished product, dry grinding must be used. When the particle size of the powder is not very fine, and the product after ball milling needs to be stored or sold in powder form, dry grinding is more appropriate.

Proper grinding methods help to better grind the processed materials, and can control the input costs within a reasonable range.

So at this point, how to choose high-alumina grinding balls in the wet grinding and dry grinding of ball mills? What are the requirements for the difference between the two grinding methods for high-alumina grinding balls?

The dry grinding of ball mills has very high requirements for the quality of high-alumina grinding balls. The quality evaluation criteria for high-alumina grinding balls in the case of the same alumina content are generally wear and density. In terms of abrasion, wet grinding has liquid medium added, the requirements for abrasion are not very high relative to dry grinding, and the ordinary abrasion is about 1/10,000 is enough to be applied, but the wear requirements of dry grinding for high alumina grinding balls are relatively high, and the high alumina grinding balls on the market are about 10,000 parts of the abrasion according to my understanding, and these low wear balls should be selected; In terms of density, the density of most of the balls nowadays is that this density is not a problem for wet grinding.

Dry grinding, on the other hand, has less water cushioning and has a very large impact on the ball. So the probability of a broken ball is very high. Therefore, high-density high-aluminum grinding balls are very suitable for dry grinding, although the density only increases, but the impact resistance of the ball increases a lot.

In addition, there are two kinds of small-size high-aluminum grinding balls: roll-forming and machine-pressed, and the impact resistance of machine-pressed grinding balls is better, but it is slightly higher than that of roll-molding, and can be adjusted according to their own production conditions.

Well, it's just a water-added one, a no-water, hehe.

Summary. The working principle and structure of wet and dry ball mills and wet ball mills are different, so the transformation of wet and dry ball mills into wet ball mills requires certain technical improvements and equipment modifications. The specific transformation steps are as follows:

1.Replacement of grinding body: The grinding body used in the wet and dry ball mill is relatively hard, which is not conducive to the grinding ore of the wet ball mill, and needs to be replaced with a grinding body suitable for the wet ball mill.

2.Add water topping equipment: Wet ball mills need to add a certain amount of water to wet the ore and make it easier for the ore to be ground.

Therefore, it is necessary to add water top-up equipment to control humidity. 3.Replacement of gears and bearings:

Wet ball mills need to withstand higher loads, so more durable gears and bearings need to be replaced to keep the equipment running.

The working principle of the wet and dry ball mill and the wet ball mill are different from the structure of the mausoleum, so the transformation of the dry and wet ball mill into a wet ball mill requires certain technical improvements and equipment transformation. The specific transformation steps are as follows:1

Replacement of grinding body: The grinding body used in the wet and dry ball mill is relatively hard, which is not conducive to the grinding ore of the wet ball mill, and needs to be replaced with a grinding body suitable for the wet ball mill. 2.

Add water topping equipment: Wet ball mills need to add a certain amount of water to wet the ore and make it easier for the ore to be ground. Therefore, it is necessary to add water top-up equipment to control humidity.

3.Replacement of gears and bearings: Wet ball mills need to withstand greater loads, so more durable gears and bearings need to be replaced to keep the equipment running.

Can you add, I don't quite understand it.

4.Replace the motor and slag transfer belt: The motor and drive belt of the wet ball mill require more power and torque, so the higher power motor and drive belt need to be replaced.

5.Addition of blowdown equipment: Wet ball mills need to remove the mixture of grinding ore and water, so additional blowdown equipment is required to keep the equipment running.

It should be noted that the transformation of a wet and dry ball mill into a wet ball mill requires certain technical and equipment modifications, which need to be modified according to the specific situation and requirements. At the same time, the transformation needs to comply with relevant safety and environmental protection regulations to ensure that the modified equipment meets the relevant technical standards and laws and regulations.

Summary. In addition to high grinding efficiency, wet grinding also has the characteristics of low noise, fine and uniform grinding particle size, and less pollution to the working environment. The advantage of dry grinding of ball mill is that the grate type grinding tail is used for discharging, the discharging speed is fast and smooth, there will be no belly swelling, the cylinder does not need to be cooled, and the service life is long.

The disadvantage of dry grinding is that there may be a dead angle in the mill, once the material enters the dead angle, it cannot come out without the drive of water, and it will not be grinded; The disadvantage of wet grinding is that the process of dewatering and drying is also carried out after grinding, which increases the cost.

In addition to the high filial piety rate of grinding, wet grinding also has the characteristics of low noise, fine and uniform grinding particle size, and less pollution to the working environment. The advantage of dry grinding of ball mill is that the grate type grinding tail is used for discharging, the discharging speed is fast and smooth, there will be no belly swelling, the cylinder does not need to be cooled, and the service life is long. The disadvantage of dry grinding is that there may be a dead angle in the mill, once the material enters the dead angle carefully, it cannot come out without the good light drive of water, and it will not be grinded; The disadvantage of wet grinding is that the process of dewatering and drying is also carried out after grinding, which increases the cost.

The main equipment of the dry grinding of the ball mill is the dry ball mill, and the structure of the dry ball mill is much more complex than the wet ball mill, and it must be equipped with an induced air device, a dust exhaust pipe and a dust collector, which is determined by its working principle. Ball mill dry grinding requires that the material in the mill is dry, no water or other liquid can be added, the material is ground by the ball mill medium in the mill, and the product that meets the requirements is brought out by the wind or air flow. The main equipment of the wet grinding of the ball mill is the wet ball mill, the structure of the wet ball mill is simple, there is no need to add too many auxiliary accessories, the grinding process needs to add water or anhydrous ethanol to the cavity loss, in the grinding operation, the large material will produce cracks under the impact and grinding action of the ball mill medium, the cracks will gradually increase and deepen, and finally the material will be separated from the cracks, so as to achieve the effect of grinding the lead god large materials.

Dry grinding is suitable for materials that will react when exposed to water, such as cement, lime, marble and other building stones, other substances may be produced when exposed to water, and it is not suitable for wet grinding. In addition, due to the scarcity of water resources in some arid areas, dry grinding can also be used to save water. Wet grinding is suitable for most materials, all kinds of metal ores, non-metallic minerals can be, as long as the water will not react, thus affecting the quality of the finished materials, can be used wet grinding, including copper ore, iron ore, molybdenum ore, phosphate ore, feldspar ore, fluorite ore and so on. The ratio of steel ball, material and water during wet grinding is 4:

2:1, the specific ratio needs to be determined by grinding test.