Ultrafine Grinding for High Hardness Materials

Description： materials such as silicon carbide, boron carbide, diamond, corundum, zirconia, rare earth materials, tungsten carbide, silicon nitride, chromium carbide, chromium oxide, corundum, chromium corundum, grinder materials, neodymium oxide, natural sand and other hard materials have higher requirements for processing machinery and equipment.

 

Silicon Carbide Information： silicon carbide, commonly known as carborundum, is colorless and transparent. Industrial silicon carbide due to the type and content of impurities contained different, and colors such as pale yellow, green, blue and even black, transparency varies with its purity. SiC crystal structure is divided into α-SiC and either hexagonal or rhombohedral β-SiC (called cubic silicon carbide). α-SiC crystal structure due to their stacking sequences of carbon and silicon atoms constituting the difference in many different variants, have been found more than 70 species. β-SiC into α-SiC at the time of above 2100 °C. Industrial methods of producing silicon carbide use high-quality silicon sand and petroleum coke in furnace refining. Refining crude silicon carbide involves crushing, acid washing, magnetic separation and screening or selection before being and made into various size products. Silicon carbide has many strong properties such as great hardness, with a Moh’s hardness of 9.5, second only to diamond (10), excellent thermal conductivity, is a semiconductor, and also resistance to oxidation at high temperatures.

 

Industrial alumina powder commonly used as raw material in electric application is arc melted at temperatures above 2000 degrees due to its dense structure, high hardness, grain formation, after cooling, shaping, magnetic separation, screening to a variety of size. For the manufacture of ceramics, resin bonded abrasives and grinding, polishing, blasting, precision casting, etc., can also be used to manufacture advanced refractory, codenamed "WA" on the international standard, consistent with national standards, mostly for export, there is a certain amount of supply domestic users. Products sized in accordance with international standards and national standards for manufacturing and processing granularity according to user requirements. The universal size number varies from F4 - F220, with its chemical composition varying depending on grain size. Some features includes small crystal size, high impact resistance, if the self-processing mill broken particles are mostly spherical particles, surface dry cleaning, easy binding agent. There are two different densities of the material, an alumina bulk density of 1.53 - 1.99g / cm³, and true density corundum. The bulk density of the abrasive and the abrasive particle size, size distribution, species, particle shape and other factors, in general, coarse-grained abrasive is larger than the fine-grained abrasive bulk density, particle size of the abrasive mix a bulk density greater than the density of a single particle size. Particle density: 3.95 - 4.0g / cm³, Di Abrasives Co., Ltd., Zhengzhou, China managed to cast special corundum true density in recent years of density 4.1g / cm3, the true density of the abrasive is the unit volume (excluding open pore volume) within contained in the basic particle size of the abrasive mass: 45% to 55%, primary particle size is an important indicator to ensure the effect of the grinding, the production should be suitably controlled, but the production rate is likely to slow.

 

Requirements for Crushing and Separation Machines and Equipment to Process High Hardness Materials：
A. Grinding tools with higher hardness and wear resistance;
B. Similar high requirements on the production lines of the unit;
C. During sorting stage, the crushed superhard materials require a narrower segment grain distribution, requiring better sorting equipment.

 

Grinding and Classifying Processes Commonly Applied for High Hardness Materials: jet milling and grading processes, with enhanced special technology with smooth channeling system are commonly applied for high purity, ultra-fine, high hardness materials.
 

         

                                                                  High Hardness Material Crushing/ Graded Specialised Production Line