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Recovery of zinc from electric arc furnace dust by alkaline pressure leaching using iron as a reductant

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Journal of Central South University 2021年第9期28卷 2701-2710页

作者： ZHANG Du-chao LIU Ruo-lin WANG Hao LIU Wei-feng YANG Tian-zu CHEN Lin School of Metallurgy and Environment Central South UniversityChangsha 410083China

To recover zinc from electric arc furnace(EAF)dust,a process of primary normal pressure leaching and secondary alkaline pressure leaching is ***,under the alkaline pressure leaching system,the experiment of pure zinc ferrite being reduced by iron powder was carried *** the optimal reduction conditions(i.e.,temperature of 260℃,NaOH concentration of 6 mol/L,liquid-to-solid ratio of 50 mL/g,and a 5-fold excess of iron powder),89%of zinc was *** iron in the reduced residue exists as a magnetite ***,the normal pressure leaching experiment was carried out with EAF dust as raw material,and 66%zinc was *** main phase of zinc in normal leaching residue was determined to be zinc ***,the normal leaching residue was reduced by iron powder under the alkaline pressure leaching system,and 66.5%of zinc was *** the two-stage leaching process,the leaching rate of zinc in EAF dust can achieve 88.7%.The alkaline pressure leaching solution can be returned as the normal pressure leaching solution,and the magnetite in the alkaline pressure leaching residue can be recovered by magnetic separation.

关键词： electric arc furnace dust normal leaching pressure leaching iron powder

Extraction of Zinc from electric arc furnace dust by Alkaline Leaching Followed by Fusion of the Leaching Residue with Caustic Soda

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Chinese Journal of Chemical Engineering 2004年第2期12卷 174-178页

作者：赵由才 R.Stanforth National Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Laboratory of Environmental Engineering Department of Chemical and Environmental Engineering National University of Singapore Singapore 119620 Laboratory of Environmental Engineering Department of Chemical and Environmental Engineering National University of Singapore Singapore 119620

Extractability of zinc from two types of electric arc furnace (EAF) dusts containing 24.8% and 16.8% of zinc respectively (denoted as Sample A and Sample B) were tested using direct alkaline leaching followed by fusion of the resulting leaching residues with caustic soda. The experimental results show that the extraction of zinc is heavily dependent on the contents of iron in the dusts. The higher iron content, the lower extraction of zinc is obtained. 53% and 38% of zinc can be extracted when both dusts were directly contacted with 5mol·L^-1 NaOH solution for 42h. The remaining zinc left in the leaching residues, which supposed to be present as zinc ferrites, can be further leached when the residues were fused with caustic soda. Quantitative extraction of zinc can be obtained from the leaching residue of Sample A while only 85% from Sample B. The extractability of zinc from dusts wit hvarious contents of iron is compared. The production flowsheet for zinc from the dusts using the process proposed is discussed.

关键词： zinc electric arc furnace dust alkaline leaching fusion caustic soda

Recovery of Zinc and Lead from electric arc furnace dust by Using Selective Chlorination and Evaporation Reaction

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Recovery of Zinc and Lead from Electric Arc Furnace Dust by ...

New pyrometallurgical process of EAF dust treatment with CaO addition

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Kitao Hiroki Matsuura Hiroyuki Tsukihashi Fumitaka Department of Advanced Materials Science Graduate School of Frontier SciencesThe University of Tokyo

Selective chlorination and evaporation reactions could become one of the applicable methods for the treatment of electric arc furnace dust containing considerable amount of zinc and lead. In this study, the selective chlorination and evaporation rate of the FeO–ZnFeO–Zn O–Pb O mixture or practical electric arc furnace dust with Ar–Cl–O gas was measured at 1073 K by gravimetry and the effects of partial pressures of chlorine and oxygen on the Zn and Pb removal rates were investigated. Zinc oxide and lead oxide contained in the oxide mixture were selectively chlorinated and zinc and lead chlorides evaporated to gas phase, while iron oxide remained as oxide in a residue. By chlorinating with Ar–Cl gas, over 99 % of zinc and lead was removed from oxide mixture as well as about 3 % of iron was lost by the chlorination and evaporation reactions. Selective chlorination using Ar–Cl–O gas was conducted to decrease the loss of iron and improve the efficiency of the selective chlorination and evaporation reactions. The selectivity of zinc and lead was improved by using O gas mixture. In the case of practical electric arc furnace dust, over 99 % of zinc was removed while about 17 % of iron was also lost by the chlorination and evaporation reactionswith Cl–O gas.

关键词： electric arc furnace dust zinc lead selective chlorination and evaporation recycling

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 788-797页

作者： Romchat Chairaksa-Fujimoto Yosuke Inoue Naoyoshi Umeda Satoshi Itoh Tetsuya Nagasaka Department of Metallurgy Graduate School of Engineering Tohoku University Toho Titanium Co. Ltd. Honda Motor Co. Ltd.

The non-carbothermic zinc pyrometallurgical processing of electric arc furnace(EAF) dust was investigated on a laboratory scale. The main objective of this process was to convert highly stable zinc ferrite(Zn Fe2O4), which accounts for more than half of total zinc in the EAF dust, into Zn O and Ca2Fe2O5 by Ca O addition. The EAF dust was mixed with Ca O powder in various ratios, pressed into pellets, and heated in a muffle furnace in air at temperatures ranging from 700 to 1100°C for a predetermined holding time. All Zn Fe2O4 was transformed into Zn O and Ca2Fe2O5 at a minimum temperature of 900°C within 1 h when sufficient Ca O to achieve a Ca/Fe molar ratio of 1.1 was added. However, at higher temperatures, excess Ca O beyond the stoichiometric ratio was required because it was consumed by reactions leading to the formation of compounds other than Zn Fe2O4. The evaporation of halides and heavy metals in the EAF dust was also studied. These components could be preferentially volatilized into the gas phase at 1100°C when Ca O was added.

关键词： electric arc furnace dust pyrometallurgy zinc oxid