Raymond (Raymond) common sense: Hardness: Because it is destructive test, so the unground of the original stone or precious of minerals can be used. There are two types of hardness scales, one is the absolute hardness, and the other is a Mohs hardness (a relatively hardness) Mohs hardness: Ten to common mineral used as a standard by scratching each other hard to distinguish what what soft , it is customary on mineralogy or gemology is Mohs hardness. Mesh sieve pore is a general characterization of the size of its conversion formula is cm = 16 / mesh, mesh has English and American, British refers to the number of holes per square inch; general Raymond and pressure micro-grinding differences at ordinary Raymond used in mining, building materials, chemical industry, metallurgy and other industries, the limestone, calcite, barite, dolomite, feldspar, marble, talcum, gypsum, kaolin, bentonite, phosphate rock, manganese ore , iron, glass, ceramics, activated carbon, carbon black, refractory materials, insulation materials, chemicals and other Mohs hardness of not more than 7, 300 kinds of humidity below 6% of non-flammable materials were milling process mill, product size between 30 mesh --325 mesh can be adjusted. Pressure micro-grinding used in mining, building materials, chemical industry, metallurgy and other industries 85 milling machine, quartz, feldspar, barite, fluorite, dolomite, garnet, silicon carbide, bauxite, marble, calcite , iron ore, phosphate rock, coal, ceramics, slag, etc. Mohs hardness of not more than 9.3, more than 400 kinds of humidity below 6% of non-flammable materials were milling machining 6r Mill, product size --425 mesh between 30 mesh. According to the above description can be seen, the ordinary Raymond for the raw material hardness no high-pressure micro-grinding machining of large raw material hardness, high-pressure micro-grinding and ordinary Raymond in the fan, crusher buy Mill, analysis and other equally under configuration, high-pressure micro-grinding Raymond one more than the normal spring high pressure, high-pressure micro-grinding mill Raymond finished size than the average particle size should be fine. And under the same conditions yield than the average yield of Raymond to increase 20% -30%. Zhengzhou Lei Machinery Co., Ltd. is a professional manufacturer Raymond manufacturers. The company is set development, production, sales Raymond mill, high pressure micro-grinding, ultra-fine milling machine, extreme pressure hanging roller mill, crushers, shredders and other products as one of the manufacturers. Material I would be processed according to different users is not the Secretary for customers to recommend suitable grinder for the user's needs. 3r milling machine, milling machine, the machine is provided by Lei Lei Machinery Co., Ltd. Zhengzhou. Zhengzhou Lei Machinery Co., Ltd. (www.hnzljx.net) (www.hnzljx.net) strong, credible, in Zhengzhou, Henan crushing grinding equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Lei machinery into the brilliant and you work for a better future!