As a common ore dressing and grinding equipment, ball mill is popular among investors. To meet the needs of different industries, different types of ball mills gradually appeared. This article will introduce several commonly used ball mills and their differences. Investors can choose appropriate ball mill according to your own needs.
Classification is based on the following points,
Although the mostly used ball mill is the dry grinding ball mill and wet grinding ball mill classified on working methods, the selection of these two types of ball mill are also the greatest confusion for investors. This part shows you the difference between dry grinding ball mill and wet grinding ball mill.
As the name implies, the dry grinding does not involve any liquid. The process is completed only by the collision and grinding between the raw material and the grinding media.
The ore in the grinding cylinder of the ball mill machine goes through certain crushing and milling. Finished products that meet the requirement will be taken out by the airflow, which is drawn out to the outside of the barrel.
The materials are mixed with the grinding media and are ground into qualified particles by crushing and squeezing. In the dry grinding process, there is no material in the cracks to keep them from being squeezed smaller. This results in lower grinding efficiency and lower material separation speed.
Wet grinding, on the other hand, means that when a certain amount of grinding is completed under the interaction between the grinding media and the ore itself, and water is involved to meet the grinding requirements. The movement of the finished product is driven by water flow.
In the wet grinding process, if there are small cracks on the large material surfaces, water or other liquid media will get into the cracks and paly a role of obstruction. Another crushing and squeezing from the grinding media will enlarge the cracks. Large materials are finally crushed and ground into qualified particles with higher grinding efficiency.
Wet grinding ball mill and dry grinding ball mill on customer sites
The grinding principle of dry grinding ball mill and the wet grinding ball mill is the same. In addition to whether adding water or not in the grinding process, dry grinding ball mill can be distinguished from wet grinding ball mill by the structure and materials processed.
The structural difference between the two types of ball mill is mainly reflected in the discharge port.
The discharge port of dry grinding ball mill is shaped as straight-tube. And the air-inducing device is also equipped to remove dust.
While the discharge port of wet grinding ball mill is shaped like a horn, inside of which is a screw device for more convenient discharge.
Some materials like cement, marble react with water, producing other substances. This reaction affects the quality of the finished products. To deal with such materials, dry grinding can be selected at this time. Besides, some products are required to be stored and sold in the form of powder. Dry grinding is also a better choice.
In addition to materials that cannot be wetly ground or are required as powder, most grindable materials can be processed by wet grinding.
For example, all kinds of metallic ore and non-metallic ore including copper ore, iron ore, molybdenum ore, phosphate ore, feldspar, fluorite and so on.
The specific proportion of grinding media, raw material and water needs to be determined by test.
Difference between wet grinding ball mill and dry grinding ball mill
As the part that pretty much contacts with raw material, the grinding medium of ball mill has also become a common consideration in the selection of ball mill plant. According to the material and shape of the medium, the commonly used ball mill is steel ball mill, ceramic ball mill and rod mill.
Steel ball mill is a common ball mill with the grinding medium of steel ball. The main types of steel ball are high-chromium steel ball and low-chromium steel ball.
Ceramic ball mill is a new type of ball mill. Its grinding medium is a kind of high hardness inorganic non-metallic grinding medium. The main material of this medium is alumina and the additive are modified toughened zirconia. Besides, the liner of the ceramic ball mill is made of ceramic material.
The rod mill is a kind of mill with steel rod loaded in the grinding body, which is often used as a first-stage milling machine. When the rod mill works, the area between grinding medium and raw material is mainly changed from surface contact to line contact.
Ball mills of different grinding media
No matter what the grinding medium in the ball mill cylinder is, the finished material size varies with the medium size, hardness, quantity, etc.
According to different ways of discharging, the ball mill gets different names: grate discharge ball mill and overflow discharge ball mill.
The grate discharge ball mill is equipped with a grate lining board on the discharging side. Products are discharged going through the grate liner and up with the fan chamber leading to the discharge port.
There is no grate liner on the discharge side of the overflow discharge ball mill. Instead, on the inner surface of the hollow bushing at the discharge size, there are helical blades, which rotate oppositely to the rolling barrel of the ball mill. This is to prevent water ball and coarse ore material from being discharged together with pulp.
The discharge of overflow type ball mill is caused by the pulp itself overrunning the lower edge of the bushing of the hollow shaft neck.
Generally speaking, due to the forced discharge mode, the grate discharge ball mill has higher production capacity than the overflow ball mill, while its discharge particle size is larger.
Typically, a ball mill is can be customized with your raw materials. Here are types of common ball mills to process different materials are gold ore ball mill, copper ore ball mill, manganese ore ball mill, chromium ore ball mill, and cement mill.
Because of the enduring economic status of gold, gold ore mining and refining has been hot for centuries. As the main equipment in gold ore processing and refining, gold ore ball mill has always been the investors' favorite selection.
Gold ore ball mill is mainly designed for the gold ore nature. Gold ore is soft, the size and material of grinding media change accordingly. A corresponding grinding method is adopted to process gold ore.
Fote gold ore grinding mill in Zambia
There is a variety of copper ore and it is widely used in many industrial fields. Processed copper ore can be used in metallurgy, building materials, machinery, chemical and other fields. High-quality copper is used to making computer chips.
According to its hardness and wear-resistance, copper ore is milled by the copper ore ball mill with strong wear resistance grinding media and liner. This improves production efficiency, as well as extend the life of copper ore ball mill. Specific material selection will be determined according to different types of copper ore.
Copper ore ball mill customer site
As a kind of ore resource with important strategic significance, the manganese ore is widely used in metallurgy, national defense, electronics, environmental protection and other fields. Sometimes, manganese ore dressed is also used as a laboratory catalyst.
According to different feed sizes, the manganese ore ball mill can load different sizes of grinding media to carry out moderate crushing and grinding to raw materials. Grinding media of large size is mainly in charge of crushing while smaller ones for grinding.
Manganese ore ball mill customer site
Chromium ore is usually of the block, granular form that is highly resistant to high temperature, wear, corrosion and oxidation. The chrome ore ball mill is designed according to the physical characteristics of chrome ore. It effectively realizes the combination of grinding system and mechanical automation to improve the ore dressing effect.
In the present situation of less chrome ore reserves and low production, it plays an important role in promoting the comprehensive utilization of chrome ore.
Chrome ore ball mill customer site
Cement ball mill is also referred to as cement mill. It is mainly used to process the raw materials used in cement production, such as cement clinker, gypsum, slag and so on. Most cement raw materials react to water, which affects the quality of cement. The dry cement process is often used to produce cement.
Cement grinding is the last and the most important link to control the quality of cement. To some extent, the grinding quality can make up for the shortage of clinker quality (that is, grinding can improve the quality of cement) and ensure the qualified rate of final cement. The cement ball mill adopts high chromium alloy steel or dual-medium quenched steel liner, which has high quenching hardness, high toughness, and less wear in production.
Fote cement ball mill
Although the working principle of different types of ball mills is the same, making use of the collision and grinding between the medium and material to achieve ideal product size, the model selection of ball mill differs in individual demands. When investing in the ball mill grinding production line, one not only needs to understand the nature of the raw materials but also take the discharge and output requirements as well as the working environment into consideration.
The appropriate ball mill can not only save cost, shorten the investment cycle period, but also let the production win in the starting line, greatly improving the production efficiency and grinding effect.
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