With the rapid development of modern science and technology, bentonite has been used in metallurgy, steel, feed, cosmetics, papermaking, medicine, chemical, petroleum and other industries as raw materials or additives for related products.

Production process:
1 Bentonite ore is used in steel, metallurgy, chemical, paper, and pharmaceutical industries.

2 Broken bentonite has a Mohs hardness of 1 to 2, which is a soft non-metallic mineral and can be initially crushed.

3 Drying can be natural or heated to remove moisture (water content ≤12%-6%). To prevent changes in the properties of bentonite caused by changes in the structure of montmorillonite, the drying temperature should be lower than 250°C and the time should not be too long.

4 Grinding is in order to meet the requirements of higher fineness of bentonite in industries such as papermaking, plastics and rubber products. Bentonite grinding equipment usually can choose European version mills, overpressure trapezoidal mills and vertical mills for grinding processing.

5 Packaging The finished materials are packaged and sent to the market.

Keep Stable Material Layer
Keep stable material layer is the foundation for raw material grinding and also the key point for the normal operation of vertical roller grinding mill. The thickness of material layer can be adjusted by changing the height of retaining ring. Proper thickness of material layer means a lot to the efficiency of vertical roller grinding mill. If the material layer thickness is too thick, the efficiency will decrease; if the material layer is too thin, vertical roller grinding mill will vibrate. Generally, when vertical roller grinding mill runs normally, the material layer after pressed by roller should not smaller than 40-50ram.

Control Grinding Pressure
Grinding pressure is main factor that affects the capacity, grinding efficiency and power of vertical roller grinding mill. vertical roller grinding mill grinds raw materials through the high pressure on material layer. When the grinding pressure increases, the capacity also increases until it reaches to the limited value. The increasing of grinding pressure also causes the increase of power, which leads to the increase of power consumption per unit. In this case, proper grinding pressure should balance capacity and power consumption. And the proper grinding pressure value is decided by the raw material property, size and feeding volume.

Proper Wind Speed
vertical roller grinding mill mainly drive the raw material circulation by air flow. Proper wind speed can form good inner circulation and make the material layer proper and stable, leading to the high efficiency of vertical roller grinding mill. Wind quantity is decided by the wind speed. And wind quantity is related with the feeding volume. When feeding volume increases, the wind quantity also increases; on the contrary, when feeding volume decreases, the wind quantity also decreases.

Control Final Products Fineness
The fineness of final products is affected by wind quantity, grinding mill load, rotation speed of separator and some other factors. When the wind quantity and load are fixed, we can adjust the fineness by changing the rotation speed.

Vertical roller grinding mill integrates five functions of crushing, grinding, powder selection, drying and material conveying. It is characterized by centralized technological process, small occupational area, low investment, high efficiency, energy conservation and environment protection.

In granite stone quarrying and mining operation, crushing will be the first processing stage. It is important to know which types of crushers are suitable for granite stone crushing, since choosing right crushing machine can optimize production efficiency and minimize operation cost.

As for granite, due to it hardness, it requires crushing machine which can deal hard stone and rocks. SBM is the professional stone crushing machine manufacturer, we provide jaw crusher, impact crusher, cone crusher and VSI crusher for various types of hard and medium hard stones. Jaw crusher can be applied in primary crushing stage in granite sotne crushing, impact crusher and cone crusher are often applied in second crushing operation, VSI crusher can be used in fine sand crushing applications. SBM experts will design cost-effective crushing solution according to your requirements with lowest cost and price.

Granite Jaw Crusher
Jaw crusher is kind of granite crusher which performs as the primary crusher, the feeding size of which can reach 1000mm, and also the final size of granite dust may be adjusted from 10-100 mm. Jaw crusher has super wear resistance and impact resistance, very flexible adaptability, more safe and reliable operation process, ultra-low failure rate, and can give full play to the coarse crushing effect of granite. It is an ideal coarse crushing equipment for granite in the current market.

Granite Impact crusher
The impact crusher is usually used for the medium and fine crushing of granite. It is made of extremely good materials in the world. The structure of each component is reasonable, the quality is quite good, the service life is super long, and it has a large processing capacity, high crushing efficiency, Special advantages such as safe and stable operation, low-carbon and environmental protection, have super pertinence and professionalism in the crushing of granite, and occupy a super high share in the crusher market.

Granite Cone Crusher
Cone crusher is another kind of granite quarrying machine which is used as the secondary crusher. SBM HST series Cone Crusher adopts computer optimization design to speed up the speed of main shaft. The unique crushing chamber replace system can quickly replace components in crushing chamber to meet different size requirement.

For high productivity, low operating and wear costs, long service life, and high product yield with desired fines, there’s no better choice than a cone crusher. The cone crusher equipment has proved revolutionary in providing higher capacity and superior product quality, and in providing a wider range of application suitability. From limestone to taconite, from ballast production to manufactured sand, and from small portable plants, cone crushers provide unbeatable performance in secondary, tertiary, and quaternary applications.

Granite Sand Making Machine
The sand making machine is used to crush granite and make sand. It is an advanced new type of sand making equipment that can be controlled remotely, stable and reliable, and the equipment has strong sealing, not easy to produce dust pollution, and is green and environmentally friendly. It also has the function of shaping, and the finished product has a good shape.

Vibrating Screen
The circular vibrating screen is used for the screening and classification of granite. The materials screened by this equipment are more fine and play an important role in controlling the purity, particle size and quality of finished materials. It has the special advantages of high screening efficiency, high output, strong adaptability, low power consumption and green environmental protection.

Raymond mills are widely used for processing various non-flammable, explosive and non-food materials with Mohs hardness below 9.3, such as commonly used barite, calcite, talc, limestone and more than 280 materials. The humidity of the material should be below 6%. If it exceeds 10%, you can choose to dry it naturally or add a dryer.

Dolomite has a hardness of 3.5-4 and a specific gravity of 2.85-2.9. It is widely distributed in nature. Dolomite is a carbonate mineral, including iron dolomite and manganese dolomite. The color of dolomite is generally off-white, similar in appearance to limestone. Generally called dolomite refers to the purer dolomite with a calcite content of less than 5%.

In the process of ore processing, grinding equipment is indispensable. A grinding mill is a kind of equipment often used in milling process. With the development of the market, the types of milling equipment are also dazzling. The secret of distinguishing mills lies in fineness and productivity. According to the standard of fineness and productivity, it is mainly divided into coarse grinding (0-80 mesh), fine grinding (80-325 mesh, 80-400 mesh) and superfine grinding (325-3250 mesh).

(1) Coarse powder mill (0-80 mesh) includes: Coarse powder mill.

(2) Fine grinding (80-325 mesh, 80-400 mesh) includes: Raymond mill, high pressure suspension roller mill, trapezoidal mill, European type mill (two types of smart and heavy), ball mill and vertical mill Powder machine and so on.

(3) Ultra-fine grinding (325-3250 mesh) includes: ultra-fine vertical mill, micro-grinding, etc.

The European version of the mill is further divided into 5X series European version of the intelligent mill and MTW series of mills. The editor here mainly introduces the MTW series European version of the mill.