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V 2 O 5 extracted from coal with SO 2 as the reductant was used to prepare battery grade VOSO 4 . The traditional technology for VOSO 4 preparation was improved. The effects of H 2 SO 4 concentration, pH, and temperature on the solubility of V 2 O 5 are discussed. The result showed that higher temperature benefits the solvation...
Discusses observations of wear patterns of longwall shearer drum bits underground which indicates that bit wear is caused mainly by the rubbing action between the back part of the bit's shank and coal face. Bit wear accelerates after the tungsten carbide tip begins to wear and reduces the bit's clearance angle, resulting in more surface contact between the bit body and coal face.
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