Hardness and Mohs hardness

Hardness: because it is a destructive test, so the stone without grinding or not precious ores can be used. The hardness of the scale has two kinds, one kind is the absolute hardness, another kind is the Mohs hardness (a relative hardness).

Mohs hardness: with ten kinds of minerals common comes as standard with a mutual scraping to distinguish or hard or soft, mineralogy gemology habit or are using the Mohs hardness. Mohs hardness is divided into ten stages. Gypsum, talc, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, diamond.

The goal is a general characterization of the pore size sieve size, the conversion formula: cm=16/ mesh; mesh with English and American, British refers to the amount of holes per square inch

Traditional Raymond mill the existence of these problems have been plaguing the mineral processing enterprises and equipment manufacturers. These problems are mainly manifested in:

  1. The fineness of product is low, the General Raymond grinding fineness is generally below 500 meshes, these devices can only occupy the lower powder application market.
  2. Mechanical failure rate is high, power consumption, noise, pollution
  3. The low efficiency of the system, collection system separation effect of the product is not ideal, a large number of fine powder is not effectively collected and repeat the cycle in the system caused by the power waste
  4. The host bellows duct design mistakes, into larger particles in the material grinding zone and future and particle grinding broken is often thrown into the bellows aggregation tail in the cochlear box, and continuously extended forward, the wind gradually decrease, easy cause traffic jams, no powder or less powder, effect of yield.

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