Natural stone abrasive applications for development

Abrasive is a high hardness and certain mechanical strength particulate material, or directly used for the manufacture of abrasive grinding and polishing. As an abrasive must have the following five respects: high hardness, moderate crush resistance and self-sharpening, good thermal stability, a certain degree of chemical stability, ease of processing into different sized particles. Divided into natural and artificial abrasive abrasive abrasive two categories. Everything in nature can be used for grinding or abrasive materials referred to as natural abrasives. Good natural abrasives not only to hard, but also toughness and sharp, rich in natural resources, or widely distributed, but also a certain purity. Although the preparation of more sophisticated artificial abrasive, but there are still some natural abrasives status.1 natural diamondDiamond (C) is the hardest known substance, Mohs hardness of 10. Common diamond crystal structure belongs to isometric crystal system of fcc structure, typical atomic crystal. Diamond and hexagonal 2H-type polymorphism phenomenon that is hexagonal diamond, the Department formed when a meteorite hit the surface, also found that tetrahedral amorphous diamond.Natural diamond, mostly eight-sided shape, as well as rhombic dodecahedron, less cubic. Natural diamond {111} surface of a distinct growth layer, the growth layer is less than 10A, and {110}, {100} surface will still produce such growth layer. Most were single crystal natural diamond output, cylindrical granular or crushed granular. Pure colorless diamonds, but relatively rare, mostly different colors, such as yellow, green, brown, pink, blue, gray, black. Gem diamond that is limited to the colorless diamond, nearly colorless, pale yellow, pink, blue, green and so on. In addition, other colors of diamond only used industrially. Diamond density of 3.50 ~ 3.52g/cm3, good thermal conductivity. Natural diamond origin, deposit types, different color, its hardness is also different. Diamond brittle, with a parallel medium {11} cleavage, that the external force, easy crystals along the {111} crystal plane split. The brittleness of diamond crystal is also the internal stress, cracks and other defects. Crystals larger internal stress, cracks and other defects have much impact on the lower can be split.The formation of the two major natural diamond mining system, namely primary ore and placer. Primary ore is mainly based primary kimberlite ore deposits, the quality is poor, the majority do industrial use. The most important is the production of diamond placer deposits, gem quality diamonds is mainly produced in the impact placer. World's most famous diamond origin of South Africa's Kimberley region, Zaire, Western Australia, Russia, Yakutia, Alaska Messina Gerais and Brazil and other places. Of China's Liaoning, Shandong, Hunan and Guizhou are diamond mines to primary ore-based, but not reserves.Natural diamond as an abrasive has two main purposes, namely wheel dressing, grinding and grinding hard materials (such as carbide, precious stones, glass, stone, etc.). Main tools of natural diamond wheel cutter, natural diamond dresser, natural diamond diamond pen, natural diamond blade, natural diamond tools, diamond rasp and glass processing tools. Different uses of diamond have different technical requirements, such as for glass processing tools required natural diamond crystals complete, the shape of 12-sided, eight-sided and transition type crystal; color limitation; transparent or translucent; allowed to have cracks, crystal allowed inside tiny inclusions.