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1981年12月26～30日国家科委、化工部在重庆主持召开了攀枝花钛精矿用预处理—多段逆流酸浸制取人造金红石中间试验的技术鉴
Dec. 26, 1981: State Science and Technology Commission and Ministry of Chemical Industry hosted the prefabrication of the titanium dioxide concentrate for Panzhihua in Chongqing - technical review of the intermediate test of artificial rutile by multi-stage counter-current acid leaching