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Quick AnswerGypsum (CaSO4·2H2O) runs Mohs 1.5-2 - soft and heat-shy; push grinding past ~120°C and it dehydrates to hemihydrate, which gives false set downstream. For 325-2500 mesh high-quality gypsum powder, the HGM three-ring micro-powder mill is the right tool: ring-roller pulverizing is gentle on a soft rock, and the air circuit with the classifier keeps temperature below the dehydration line, yielding a fine, well-shaped powder instead of the flakes a ball mill tends to make. A single jaw (...
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