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steel hardgrove grindability index apparatus

Then, HGI Hardgrove grinding index is calculated and expressed in H. The method was designed for grinding coal, but it later expanded to other materials as well 6. Another method is the Zeisel method, which was invented in 1953 and is based on Hardgrove. It uses a similar apparatus but operates at 100 to 200 mill revolution instead of 60.

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