高温素材プロセッシング

[2710] Production of High-grade Copper Sulfide through Selective Removal of Iron from Cu Ore

^○姜正信^1,2, 李珍榮^1,2 (1.Korea Institute of Geoscience and Mineral Resources, 2.University of Science and Technology)

司会:谷ノ内勇樹(東京大学)

Keywords:Cu sulfide ore, Cuprous chloride, Copper sulfide, Selective chlorination, Iron removal

With the purpose of producing high-grade copper sulfide (Cu₂S) directly from chalcopyrite (CuFeS₂) or Cu sulfide ore, a fundamental study on the selective chlorination process using cuprous chloride (CuCl) as a chlorinating agent was carried out. In the experiments, CuFeS₂ or various types of Cu ores were reacted with CuCl in the presence of sulfur (S) or without S in a quartz crucible at 900 – 1100 K for 5 h under an Ar atmosphere. The iron in the CuFeS₂ or Cu ore was selectively removed as ferrous chloride (FeCl₂), and high-grade Cu₂S was directly obtained in a single step. Owing to the removal of iron, the mass percentage of Cu in CuFeS₂ and Cu ore was increased from 36.8 % and 39.8 % to 76.6 % and 66.6 %, respectively, and the iron removal ratio was 98.0 – 99.5 % under certain conditions. It was thus demonstrated that selective chlorination using CuCl is a feasible method to produce high-grade Cu₂S directly.