一九七九年四月十日至十四日,由煤炭部生产司、科技局主持,在开滦马家沟矿召开了全国重介质选煤技术会议。参加会议的有:河北省煤管局,全国各有关矿务局、重介选煤厂、大专院校、研究所、设计院等51个单位118名代表。一机部所属有关单位应邀也参加了会议。在开幕式中,部生产司郝凤印副司 From April 10 to January 14, 1979, chaired by the Production Department and Science and Technology Bureau of the Ministry of Coal Industry, a national heavy medium coal preparation technology conference was held in Majiagou Mine, Kailuan. Participants at the conference included 118 delegates from 51 units including Hebei Coal Administration, relevant mining bureaux, heavy medium coal preparation plants, tertiary institutions, research institutes and design institutes. A unit belongs to the relevant units were also invited to attend the meeting. In the opening ceremony, the Department of Production Hao Feng Yin, deputy director