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1984年11月22日由煤炭科学研究院与河南省煤炭厅共同主持在义马矿务局观音堂煤矿召开了水介质旋流器脱除煤中黄铁矿硫工艺设备鉴定会。参加会议的有局、
November 22, 1984 co-chaired by the Coal Research Institute and the Henan Coal Office held a coal-based pyrite sulfur process equipment appraisal meeting at the Guanyintang Coal Mine in Yima Mining Bureau. Attending meetings,