how to measure material hardness and choice right crusher?
1. Moh’s hardness
It is a standard to measure material or mineral ore hardness proposed by Germany mineralogist Mohs. He uses pyramid shape diamond needle to carve on the surface of mineral ore, which is called scarification. The carved depth is used to measure the ore hardness. Moh’s unit is level such as f=2 means the hardness of ore is level 2. The Moh’s hardness is not the absolute ore harness value but a number represent ore harness according to harness order.
2. Compression strength:
It means rock can bear the highest pressure in no lateral bundle situation, often measured by kg or Pa per square centimeter. For example: 1 MPa = 10 kg/cm2
3. HGI (Hartz Grindability Index)
HGI main measures the coal grindability, which reflects different difficult of different coal grinding into powder. The higher the HGI it is, the more fineness it is of same granularity of coal grinding into coal power under on the condition of same power consumption or the less energy consumption of same granularity of coal grinding into coal powder. The coal grindability is a compound physical property, related to coal hardness, intensity, fragility and brittleness as well as relate with coal decade, structure, type of coal and distribution.
4. Bond work index:
It is put forward by American man Bond that describes material from original particle size to 80% fineness with unit output grinding work. In the craft design of cement grinding system, raw material test, and clinker including burdening, mixture material, etc often adopts Bond work index.
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