Raymond Mill

Raymond mill applicable to a variety ore preparation, coal preparation, such as powder processing of raw ore, gypsum ore, coal and other materials. It is mainly used barite, calcite, potash feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, insulation materials Mohs hardness of not greater 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.

Development History Of Raymond Mill

In 1906 CVGrueber created in the southern suburbs of Berlin, Curt Von Grueber machinery factory, using his gained in U.S. Patent produce Maxecon's first mill, and for the Berlin region BEWAG MOABIT coal power plants as grinding equipment, grinding energy up to 5T / H, within a few years sold nearly 600 units, respectively, used in the field of grinding different industries. The proposed construction of the same period BEWAG higher yields coal mill. After E.C.Loesche shares and director Curt Von Grueber machinery factory decided to buy raymond centrifugal US patent discloses a ring roller mill, Raymond Mill produced the first generation system. Since the grinding force Raymond Mill roller mill (centrifugal force) is limited by the grinding roll diameter and speed of the mill is only applicable to a soft, low ash content and grindability good coal quality materials, while Germany's coal quality at the time hard, and high ash content, the need for higher grinding forces, Raymond coal mill grinding this structure is difficult to meet the requirements, so Raymond coal mill in Germany has not been universal. At that time, just for the United States Raymond coal mill grinding of coal quality requirements, so Raymond coal mill was in the United States has been widely promoted and applied.

In 1925 E.C.Loesche summary of the first generation of Raymond mill use features and structural weaknesses, decided to further improvement of Raymond mill grinding structure, a grinding principle and the opposite mill was developed, called improved Raymond mill. The improved system of Raymond Mill ventilation has positive and negative pressure direct blow in two ways. This type of Raymond Mill patent was soon America Combustion Engineering Company (Combustion Engineering) to buy. Because of the improved Raymond mill still exists ring roller mill, although the roll diameter increased slightly, but the grinding force increases slightly. Later, the United States Combustion Engineering Company Raymond branch and based on the development of a new generation of Raymond mill, called VR mill. The Raymond mill structure in many aspects and the Loesche mill are similar. It is worth noting is it is different in Loesche mill cone grinding roller and the plane grinding, and the use of cylindrical grinding roller and the tape with a 15 degree angle of inclined surface grinding disc. Grinding and in inspection and maintenance has and Loesche mill grinding and pulls out a device similar, and also is provided with the protective device, to prevent the grinding roller and the grinding disc between the metal contact. In addition, before the start of the mill, the grinding roller can be lifted in advance, so that the starting torque of the motor can be reduced. Raymond Mill in application of industrialization in the United States, usually to pulverized coal preparation and the fineness of the product changes in between the 250-325, product fineness and the output regulation of operation in the operation process.

Knowledge Of Raymond Mill

Hardness: Because it is destructive test, so the rough or unpolished precious of minerals can not be used. Hardness scale there are two types, one is the absolute hardness, and the other is a Mohs hardness (a relatively hardness).

Mohs hardness: the ten common minerals as standard with each other scratching hard to distinguish what what soft, customary on mineralogy or gemology is Mohs hardness.

Mohs hardness in ten stages. Talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, diamond. Mesh sieve is a general characterization of the size of the aperture, the conversion formula is: cm = 16 / mesh; mesh has English and American, British refers to the number of holes per square inch.

Raymond Mill Structure

  • The three-dimensional structure of Raymond mill, small footprint, complete and strong, from raw materials to finished powder sub block form up an independent production system.
  • Finished powder fineness uniform rate of 99% through screening, it is difficult for other milling equipment available.
  • Main engine driving device adopts closed gearbox and belt wheel, transmission smooth, reliable operation.
  • Raymond Mill important parts are made of high quality steel, wear resistant parts are used, high performance, anti-wear materials, machine wear resistance of high and reliable.
  • The electrical system with centralized control, mill shop basically no work can be realized, and the maintenance is convenient.

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