GB/T 2565-2014 Determination of Grindability Index of Coal - Hardgrove Method
The working principle of the Hastelloy Grindability Index Tester is based on the grinding law (that is, the energy consumed by grinding coal powder is proportional to the new surface area generated by coal powder). The prepared coal sample with a certain particle size range is ground in the Hastelloy Tester, and then screened, weighed, compared, and calibrated to find the grindability index.
The measurement results of the Ha's grindability index tester can accurately reflect the difficulty level of coal grinding, providing a basis for the design and operation of coal mills. The machine has multiple functions, including mechanical bowl feeding, microcomputer counting, automatic shutdown when the counter displays 60 revolutions per minute, emergency stop in case of host failure, and accumulation of revolutions per minute when restarted.
The Hardgrove Grindability Index Tester is based on the grinding law (the energy consumed by grinding coal powder is proportional to the new surface area generated by coal powder). Under the conditions specified in GB 2565 "Method for Determining the Grindability Index of Coal" (Hardgrove Method), the prepared coal sample is ground, screened, and weighed. The Hardgrove Grindability Index is obtained from the calibration chart drawn from the standard coal sample. The larger the index, the easier it is to grind.
1. Spindle speed: 20 ± 1r/min
2. Limit working speed: 60 ± 0.25r
3. Load capacity: 284 ± 2N
4. Electric motor power: 90W
5. Speed: 1400r/min
6. Power supply voltage: three-phase 380V
7. Instrument weight: 85kg
8. Dimensions (length x width x height): 360x420x450mm
GB/T 2565-2014Method for determining the grindability index of coal Hardgrove Law