The change of iron composition as well as the removal of copper from iron was investigated in the reduction process, and a new way to deal with copper slag was proposed. The iron in copper slag exists mainly in the form of fayalite, and the copper sulfide content accounts for just about 50%. Therefore, the magnetic separation as well as grinding floatation method is not suitable, and a pyrogenic treatment on copper slag is necessary. The carburization and desulfurization process is restricted to a degree within the carbon composite pellets, and copper matte phase precipitates from copper slag in the reduction process, which is immiscible with molten iron and slag. The copper content decreases to 0.4% as the carbon content in molten iron reaches 3.84%, and the removal ratio of copper from molten iron approaches to 80%. The reduction and sulfurization process can be completed in one step, and the copper is separated from iron based on the ternary system of iron-matte-slag.
Key words
copper slag, reduction, sulfurization, matte
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References
[1] 李博，王华，胡建杭，等. 从铜渣中回收有价金属技术的研究进展[J]. 矿冶， 2009，18(1) : 44～48.
[2] 胡建杭，王华，刘慧利等. 铜渣在不同煅烧温度的晶相结构[J]. 湖南科技大学学报：自然科学版，2011，26 ( 2 ) : 97～100.
[3] 张林楠，张力，王明玉，等. 铜渣贫化的选择性还原过程[J]. 有色金属，2005，57( 3) : 44～47.
[4] 陈海清，李沛兴，刘水根等. 铜渣火法强化贫化工艺研究[J]. 湖南有色金属，2006，22( 3) : 16～18.
[5] Reddy R G, Prabhu V L, Mantha D. Recovery of copper from copper blast furnace slag[J]. Minerals＆Metallurgical Processing, 2006, 23(920 : 97～103.
[6] Vaisburd S, Brandon D G, Kozhakhmetov S, et al. Physicochemical properties of matte-slag melts taken from vanyukovs furnace for copper extraction[J]. Metallurgical and Materials Transactions B, 2002, 33B: 561～564.
[7] Sarrafi A，Rahmati B，Hassani H R，et al. Recovery of copper from reverberatory furnace slag by flotation[J]. Minerals Engineering，2004，17(3) : 457～459.
[8] Bruckard W J, Somerville M, Hao F. The recovery of copper, by flotation, from calcium-ferrite-based slags made in continuous pilot plant smelting trials[J]. Minerals Engineering, 2004, 17(4) : 495～504.
[9] 金锐，王景双，龙秋容. 复杂铜冶炼渣浮选试验研究[J]. 江西有色金属， 2009，23(1): 12～14.
[10] 魏明安. 铜转炉渣选矿回收技术研究[J]. 矿冶，2004，13(1): 38～41.
[11] 陈江安，龚恩民，李晓波等. 江西贵溪铜冶炼厂转炉渣选矿工艺研究[J]. 江西理工大学学报，2010，31(3): 19～21.
[12] 李沛兴，刘水根，张振健等. 铜渣火法强化贫化工艺研究[J]. 湖南有色金属， 2006(3): 16～18.
[13] Long T V, Palacios J, Sanches M, et al. Recovery of molybdenum from copper slag[J]. ISIJ International, 2012, 52(7): 1211-1216.
[14] Wang C, Hirama J, Nagasaka T, Ban-Ya S. Phase equilibria of liquid Fe-S-C ternary system[J]. ISIJ International, 1991, 31(11): 1292-1299.
[15] Wang C, Nagasaka T, Hino M, Ban-Ya S. Copper distribution between molten FeS-Na2S flux and carbon saturated iron melt[J]. ISIJ International, 1991, 31(11):1300-1308.
[16] Wang C, Nagasaka T, Hino M, Ban-Ya S. Copper distribution between FeS-alkaline or –alkaline earth metal sulfide fluxes and carbon saturated iron melt[J]. ISIJ International, 1991, 31(11):1309-1315.
[17] Zhang J, Qi Y H, Yan D L, Cheng X L, He P. Study on characteristics and mechanism in reduction and smelting-separation process of copper slag [J]. Journal of iron and steel research
(English edition), 2013.
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Footnotes
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Funding
National science and technology support plan
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