What kind of silica sand grinding mill is best?

With the development of iron and steel technology, blast furnace has new requirements for the output and quality of pellets. Compared with the traditional pelletizing process, there are a large number of additives and corresponding grinding systems, such as anthracite (or coke powder, petroleum coke) grinding mill system, limestone (dolomite) grinding mill system, bentonite grinding mill system, etc. Among them, to improve the quality and metallurgical properties of pellets. To supplement the deficiency of SiO2 in iron concentrate, a certain amount of acid flux will be added. Such as olivine, serpentine and silica sand, and silica sand is the most difficult to grind as an acid flux with high hardness. What are the requirements for pellet refined silicon? What kind of silica sand grinding mill machine is used for pelletizing silica sand grinding? This article will explain it in detail for you.

What are the requirements for pellet refined silicon? Silica sand is a hard, wear-resistant and chemically stable silicate mineral with SiO2 as the main mineral composition and particle size of 0.020~3.350mm. Its color is milky white, light yellow, brown and gray, hardness 7, brittleness without cleavage, shell-like fracture, grease luster, relative density 2.65, insoluble in acid, slightly soluble in KOH solution, melting point 1750 ℃. The required particle size of silica sand grinding powder is<0.15mm, and the moisture content is<10%. – 200 mesh accounts for 60%. The requirements for pellet refined silica are as follows: specific surface area 4500c ㎡/g, – 325 mesh accounting for 90%, – 200 mesh accounting for more than 90%, water content 5%, and silicon dioxide content greater than or equal to 90%. So, what equipment of silica sand grinding mill machine can be used to grind silica sand to meet the requirements of the football team?

As a silica sand grinding mill equipment, the roller has a large capacity. However, the system investment is high, and the grain size of the strict product is difficult to meet the requirements of the football ball refined powder silicon, and the price is high. The powder size of the ball mill is relatively fine. Although the initial investment of the equipment is relatively low, the equipment covers a large area, and the steel ball loss is large, and the energy consumption is high, resulting in high equipment operation and capital construction costs. Due to the combination of drying and grinding, the silica sand vertical roller mill has low cost, low humidity, low energy consumption, and adjustable fineness. The content of fine silica powder above 325 mesh can be controlled at about 3%, which can better meet the requirements of the football team’s fine silica powder. In addition, the silica sand vertical roller mill adopts negative pressure production, the air volume is recycled, the continuity is relatively good, the system design is relatively reasonable, the dust concentration in the workshop of the silica powder processing device is very low, and there is no phenomenon of silica dust flying, fundamentally eliminating the possibility of silica dust space dust explosion. Therefore, the vertical grinding of silica sand is an ideal equipment for meeting the requirements of pelletized refined silica.