The first is to remove impurities and improve the purity of products; the second is to reduce the particle size of products to different degrees. At present, the crushing and grinding classification technology and equipment at home and abroad have developed to a new level, which can meet the application needs of the vast majority of raw materials in different industries, including non-metallic minerals, cement, ceramics, chemical industry, coal powder, metal minerals, solid waste of tailings, etc.
Calcium carbonate
At present, the production of heavy calcium carbonate is mainly grinding and surface modification. The dry process is generally used to produce heavy calcium carbonate products with D97 ≥ 3-5 μ M. the grinding equipment mainly includes Raymond mill, impact mill, dry mixing mill, air flow mill, vertical mill, ring roller mill, vibration mill and ball mill (click to see: how to select heavy calcium carbonate grinding equipment and process?).
quartz
Quartz is hard and wear-resistant, especially when it needs fine grinding, it is difficult to obtain the grinding product with ideal fineness only by the grinding effect of medium. Therefore, a certain amount of grinding aids are often added in the process of quartz grinding to improve the grinding effect (click to check: how about adding some grinding aids when quartz is so hard?).
Microsilica
The production of silica powder is mainly by physical comminution, which can be divided into dry process and wet process. The technology of dry process is simple and the production cost is low. For the ultra-fine products with the cut point less than 5 μ m and the surface treatment products are suitable for the wet process (click View: 1) to understand the ultra-fine production technology of silicon powder.
dolomite
Dolomite has a layered structure with a hardness of 3.5-4. Generally, jaw crusher, hammer crusher and impact crusher are used to crush the ore. after screening and classification, dolomite particles with a certain size are obtained. For fine crushing and grinding, roller press, hammer mill, mixing mill and air flow mill are often used (click to check: Dolomite crushing and grading technology).
Ceramic raw materials
At present, the preparation of raw materials in China's ceramic enterprises basically adopts ball milling process, typical of which are intermittent mill + intermittent mill, intermittent mill + continuous ball mill, vertical mill + intermittent mill or vertical mill + continuous mill (click to check: new grinding process and new technology of ceramic raw materials).
cement
At present, most cement plants use the combined grinding system composed of roller press and ball mill for production. The cement grinding system composed of roller press and ball mill has three forms: pre grinding system, combined grinding system and half final (double circle flow) grinding system. The selection of process flow mainly depends on the relative size of roller press and ball mill (click to check: 16 kinds of cement grinding processes and Characteristics).
limestone
Limestone is the main raw material for the production of cement, concrete coarse and fine aggregate, lime, etc. its crushing and grinding generally adopt the dry process, and select the corresponding process according to different application fields (click View: Limestone grinding process).
Fly ash
The particle size and particle shape of fly ash determine its application performance. Choosing the appropriate grinding process according to the physical and chemical characteristics of fly ash and the fineness requirements of the finished product is an important link to determine the economic value and processing cost of the ground ash (click to view: four typical fly ash grinding processes).
Slag
Steel slag is a kind of industrial solid waste produced by converter steelmaking and electric arc furnace steelmaking, which is mainly composed of calcium silicate and calcium ferrite. It is an important way to realize high added value utilization of steel slag by using steel slag as cement admixture or concrete admixture (click View: five grinding processes of steel slag).
slag
Blast furnace slag is a byproduct discharged from the process of blast furnace ironmaking, which has high potential activity. When it is grinded to a certain fineness, it can replace cement in concrete and produce green synthetic cement in equal amount. It can not only be used to prepare ordinary concrete, but also is one of the most commonly used mineral fine admixtures in high-performance concrete (click to check: slag vertical grinding code Type a process and common problems).
Recommended reading:
▌ live broadcast review several key problems in grinding of| minerals
▌ classification and selection principle of grinding aids
▌ four factors influencing the effect of grinding aids and dispersants
▌ top 10 "tricks" to improve grinding efficiency of ball mill
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