Raymond milling equipment is used primarily for barite, calcite, potash feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock , plaster, glass, insulation materials and other Mohs hardness less than 9.3, a high fine powder generation and processing humidity below 6% of non-flammable mineral, chemical, construction and other industries more than 280 kinds of materials. Raymond also known as Raymond mill, the English name: Raymond mill. It is suitable for all kinds of ore preparation, coal preparation, such as raw material powder processing ore, gypsum ore, coal and other materials. Raymond, Raymond mill, Raymond efficient, high pressure rotary roller mill. Raymond CVGrueber create history in 1906 in Berlin, Curt Von Grueber machinery factory in the southern suburbs, he obtained the use of patents in the United States produce the first station Maxecon mill, and for BEWAG in Berlin's MOABIT coal power plant equipment as milling, grinding energy up to 5T / H, a few years sold nearly 600 units, respectively applied to the grinding areas of different industries. BEWAG proposed construction year higher yield coal mill. After ECLoesche shares and director Curt Von Grueber machinery factory decided to buy raymond centrifugal US patent discloses a ring roller mill, produced the first generation of Raymond system. The structure was erected in the center of the machine with a belt holder with rotating spindle plum, plum rack hanging three or more rotation roller rotating shaft driven at a constant rotational speed roller swings out, and In the centrifugal force of driving under the pressure mounted on the cylinder wall of the grinding ring. When the material into the grinding area under plow-shaped guide roller blade material beneath the action is brought to the front area of ??the roller. Since Raymond coal mill roller mill grinding force (centrifugal force) is restricted grinding roll diameter and rotation speed of the mill at the time only available in soft, low ash content and grindability good coal quality materials, and Germany hard coal quality, ash content and high need for higher grinding force, Raymond coal mill grinding this structure is difficult to meet the requirements, so Raymond coal mill in Germany have not been universal. At that time, just for the United States Raymond coal mill grinding coal quality requirements, so Raymond coal mill was in the United States has been widely promoted and applied. Raymond mill common sense and Mohs hardness 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. Mohs hardness ten minutes. Talc, gypsum, calcite, fluorite, apatite, feldspar, quartz, topaz, corundum, diamond. Mesh aperture size is generally characterized sieve, the conversion formula is: cm = 16 / mesh Henan Environmental Engineering Technology Co., Ltd. morning million Website: http://www.chenyikeji.cn http://www.chenyikeji.net http : //www.cykjshy.com http://www.cykjly.com http://www.cykj168.com http://www.hncygckj.com http://www.chenyikj.com http: // www. cyhgj.com http://www.sfxksb.com http://www.ztxsjx.com http://www.ztslx.com