Extracting indium and preparing ferric oxide for soft magnetic ferrite materials from zinc calcine reduction lixivium

Abstract

A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed. Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine as raw solution, copper and indium were firstly recovered by iron powder cementation and neutralization. The recovery ratios of Cu and In are 99% and 95%, respectively. Some harmful impurities that have negative influences on magnetic properties of soft magnetic ferrite material are deeply removed with sulfidization purification and neutral flocculation method. Under the optimum conditions, the content of impurities like Cu, Pb, As, Al in pure Zn-Fe sulfate solution are less than 0.004 g/L, but those of Cd, Si, Ca and Mg are relatively high. Finally, thermal precipitation of iron is carried out at 210 °C for 1.5 h. The precipitation ratio of Fe is 93.33%. Compared with the quality standard of ferric oxide for soft magnetic ferrite materials, the contents of Al and Mg in obtained ferric oxide powder meet the requirement of YHT1 level of ferric oxide, and those of Si, Ca meet the requirement of YHT3 level of ferric oxide. XRD and SEM characterizations confirm that the obtained sample is well-dispersed spindle spherule with regular α-Fe₂O₃ crystal structure. The length-to-diameter ratio of α-Fe₂O₃ powder is (3–4):1 with an average particle size of 0.5 μm.

Keywords

zinc concentrates / zinc hydrometallurgy / indium extraction / deep purification / ferric oxide powder

References

[1] ChenJ.-y., YuS.-q., WuZ.-chun.Separation and utilization of iron in hydrometallurgy [M], 1991, Beijing, Metallurgical Industry Press: 82-92

[2] ElgersmaF., WitkampG. J., van RosmalenG.. Simultaneous dissolution of zinc ferrite and precipitation of ammonium jarosite [J]. Hydrometallurgy, 1993, 34(1): 23-47

[3] DutrizacJ. E.. Effectiveness of jarosite species for precipitating sodium jarosite [J]. JOM, 1999, 51(12): 30-32

[4] ClaassenJ. O., MeyerE. H. O., RennieJ., SandenbeghR. F.. Iron precipitation from zinc-rich solutions: Optimizing the Zincor process [J]. Journal of the South African Institute of Mining and Metallurgy, 2003, 103(4): 253-263

[5] ClaassenJ. O., MeyerE. H. O., RennieJ., SandenbeghR. F.. Iron precipitation from zinc-rich solutions: Defining the Zincor process [J]. Hydrometallurgy, 2002, 67(1/2/3): 87-108

[6] LoanM., NewmanO. M. G., CooperR. M. G., FarrowJ. B., ParkinsonG. M.. Defining the Paragoethite process for iron removal in zinc hydrometallurgy [J]. Hydrometallurgy, 2006, 81(2): 104-129

[7] van Niekerk, ChristoffelJ.. Thermal precipitation of iron from sulphate solutions [J]. Mining & Metallurgical Inst of Japan, 1985, 33(10): 691-706

[8] PappuA., MohiniS., ShyamR. A.. Hazardous jarosite use in developing non-hazardous product for engineering application [J]. Journal Hazardous Materials, 2006, 137(3): 1589-1599

[9] PappuA., MohiniS., ShyamR. A.. Jarosite characteristics and its utilization potentials [J]. Science of the Total Environment, 2006, 359(2): 232-243

[10] HageJ. L. T., SchuilingR. D., VriendS. P.. Production of magnetite from sodiumjarosite under reducing hydrothermal conditions: The reduction of Fe^III to Fe^II with cellulose [J]. Canadian Metallurgical Quarterly, 1999, 38(4): 267-276

[11] PelinoM., CantaliniC., RinconJ. M.. Preparation and properties of glass-ceramic materials obtained by recycling goethite industrial waste [J]. Journal of Materials Science, 1997, 32(17): 4655-4660

[12] MontanaroL., BianchiniN., RinconJ. M., RomeroM.. Sintering behaviour of pressed red mud wastes from zinc hydrometallurgy [J]. Ceramics International, 2001, 27(1): 29-37

[13] PelinoM., CantaliniC., AbbruzzeseC., PlesciaP.. Treatment and recycling of goethite waste arising from the hydrometallurgy of zinc [J]. Hydrometallurgy, 1996, 40(1/2): 25-35

[14] PigaL., StoppaL., MassiddaR.. Recycling of industrial goethite wastes by thermal treatment [J]. Resources, Conservation and Recycling, 1995, 14(1): 11-20

[15] NingS.-m., ChenZ.-fei.. Recovery of zinc and indium from jarosite residues [J]. Transactions of Nonferrous Metals Society of China, 1997, 7(3): 56-58

[16] AlfantaziA. M., MoskalyR. R.. Processing of indium: A review [J]. Minerals Engineering, 2003, 16(5): 687-694

[17] ZaspalisV., TsakaloudiV., PapazoglouE.. Development of a new Mn-Zn ferrite soft magnetic material for high temperature power applications [J]. Journal of Electroceramics, 2004, 13(1/2/3): 585-591

[18] OttG., WrbaJ., LuckeR.. Recent developments of Mn-Zn ferrites for high permeability applications [J]. Journal of Magnetism Magnetic Material, 2003, 254/255: 535-537

[19] TANG Mo-tang, HUANG Xiao-zhong, LU Jun-he, OU Yang-min. A new process to produce magnetic materials. China, ZL95110609 [P]. 1995-01-06. (in Chinese)

[20] TANG Mo-tang, LI Shi-qing, YANG Shen-hai, TANG Chao-bo, HE Jing, PENG Chang-hong, YAO Wei-yi. The hydrometallurgy of zinc and indium without iron residue [J]. Nonferrous Metals: Extractive Metallurgy, 2004, (6): 27–29. (in Chinese)

[21] LiG.-k., ZhaoY.-cai.. Adsorption-flocculation-sedimentation of total iron onto sediments in Yellow River [J]. Environmental Chemistry, 2004, 23(1): 58-61