河北省经委、机械局、铸造学会于1982年4月20日至25日在河北宣化召开“张家口地区膨润土试验与研究应用现场会”。参加此次会议的有河北省煤炭、冶金、机械、轻、化工系统的工厂,全国大专院校,科研部门共100个单位130名代表。应邀出席会议的还有北京、天津、山西、内蒙、福建、淅江、江苏、云南、广东、山东等省市代表,沈阳铸造研究所,济南 The Economic Commission of Hebei Province, the Machinery Bureau, and the Foundry Society held the “Zhangjiakou Bentonite Experimental and Research Application Site Conference” in Xuanhua, Hebei Province from April 20th to 25th, 1982. At the meeting, there were representatives from the coal, metallurgy, machinery, light, and chemical systems in Hebei Province, and representatives of universities and research institutes across the country with a total of 130 representatives from 130 institutions. Invited to attend the meeting are Beijing, Tianjin, Shanxi, Inner Mongolia, Fujian, Fujian, Jiangsu, Yunnan, Guangdong, Shandong and other provinces and cities, Shenyang Foundry Research Institute, Jinan