Recovery of zinc and iron from high iron-bearing zinc calcine by selective reduction roasting

Han, Junwei; Liu, Wei; Qin, Wenqing; Peng, Bing; Yang, Kang; Zheng, Yong-xing

doi:10.1016/j.jiec.2014.07.020

Cited by 57 publications

(17 citation statements)

References 25 publications

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“…Therefore, the addition of Fe 2 O 3 not only improved the sulfidation of ZnO but also promoted the formation and growth of ZnS crystals, because the generation of the intermediates with low melting points (iron sulfides) improved the liquidity of the reactants 32 . On the other hand, the majority of ZnO was converted into iron-bearing zinc sulfides and thus ZnO was hardly found by EDS, but some zinc reacted with iron oxide to zinc-bearing magnetite (Zn x Fe 3− x O 4 ), which is a spinel, magnetic and insoluble in mild solution, and is usually produced during the reduction process of zinc ferrite 46 47 48 , was generated. The spinel formation is bad for the separation of zinc and iron, but it can be decreased by increasing the reducibility of the reaction system.…”

Section: Resultsmentioning

confidence: 99%

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Han

Liu

Zhang

et al. 2017

Sci Rep

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The mechanism of ZnO sulfidation with sulfur and iron oxide at high temperatures was studied. The thermodynamic analysis, sulfidation behavior of zinc, phase transformations, morphology changes, and surface properties were investigated by HSC 5.0 combined with FactSage 7.0, ICP, XRD, optical microscopy coupled with SEM-EDS, and XPS. The results indicate that increasing temperature and adding iron oxide can not only improve the sulfidation of ZnO but also promote the formation and growth of ZnS crystals. Fe2O3 captured the sulfur in the initial sulfidation process as iron sulfides, which then acted as the sulfurizing agent in the late period, thus reducing sulfur escape at high temperatures. The addition of carbon can not only enhance the sulfidation but increase sulfur utilization rate and eliminate the generation of SO2. The surfaces of marmatite and synthetic zinc sulfides contain high oxygen due to oxidation and oxygen adsorption. Hydroxyl easily absorbs on the surface of iron-bearing zinc sulfide (Zn1−xFexS). The oxidation of synthetic Zn1−xFexS is easier than marmatite in air.

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Section: Resultsmentioning

confidence: 99%

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Han

Liu

Zhang

et al. 2017

Sci Rep

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“…The leaching results were evaluated by chemically determining the original materials and leach products using ICP, XRD and SEM-EDS. The element concentrations of both solid and solution samples were determined by ICP (ICAP7400 Radial, Intrepid II XSP, Waltham, MA, USA), and each sample was measured at least three times [26][27][28]. 1 mL of leachate was diluted with 500 mL 10% HNO 3 medium to provide a sample with the appropriate concentration.…”

Section: Methodsmentioning

confidence: 99%

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Liu

Han

et al. 2019

Minerals

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This study investigated the feasibility of using an alkaline pressure oxidative leaching process to treat lead smelter flue dust containing extremely high levels of arsenic with the aim of achieving the selective separation of arsenic. The effects of different parameters including NaOH concentration, oxygen partial pressure, liquid-to-solid ratio, temperature, and time for the extraction of arsenic were investigated based on thermodynamic calculation. The results indicated that the leaching efficiency of arsenic reached 95.6% under the optimized leaching conditions: 80 g/L of NaOH concentration, 1.0 MPa of oxygen partial pressure, 8 mL/g of liquid-to-solid ratio, 120 °C of temperature, 2.0 h of time. Meanwhile, the leaching efficiencies of antimony, cadmium, indium and lead were less than 4.0%, basically achieving the selective separation of arsenic from lead smelter flue dust. More than 99.0% of arsenic was converted into calcium arsenate product and thus separated from the leach solution by a causticization process with CaO after other metal impurities were removed from the solution with the addition of Na2S. The optimized causticization conditions were established as: 4.0 of the mole ratio of calcium to arsenic, temperature of 80 °C, reaction time of 2.0 h. The resulting product of calcium arsenate may be used for producing metallic arsenic.

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“…Currently, more than 85% of zinc is produced through the Roasting-Leaching-Electrowinning (RLE) process, which is the most important method of zinc extraction from sulfide ores and concentrates [3][4][5][6]. During this process, both the sulfide ores and concentrates are roasted at 700 to 900 • C, generating SO 2 , which is known to be an environmental pollutant [7]. Pressure leaching is a promising process for reducing environmental pollution essentially by removing the roasting step from the RLE process thus producing elemental sulfur or sulfate instead of SO 2 [8,9].…”

Section: Introductionmentioning

confidence: 99%

Research on Behavior of Iron in the Zinc Sulfide Pressure Leaching Process

et al. 2020

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Dissolved iron exerts significant effects on mineral leaching, impurity removal, and solution purification in the zinc hydrometallurgy process. To date, iron oxidation and migration behaviors are yet to be fully understood and further research on effective regulation mechanisms of iron is required. In this paper, zinc sulfide concentrate was used as the research object. The behaviors of both Zn and Fe during pressure leaching were investigated for varying temperature, acid addition, and leaching time. At temperature of 100~160 °C, H2SO4/Zn ratio of 0.9:1–1.25:1, and leaching time of 0.5–2.5 h, the zinc extraction increased with temperature, acidity and leaching time. The iron extraction, however, varied differently with increasing temperature, acidity and leaching time: (A) it increased with temperature to 150 °C and then decreased at higher temperature, and (B) displayed an initial increase followed by a decrease with respect to the leaching time. Based on the characteristics of the residue phase, chemical phase analysis was used to analyze the residue in detail. The extent of dissolution of iron-containing minerals and the extent of precipitation of ferric ions during the leaching process were quantitatively calculated.

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Recovery of zinc and iron from high iron-bearing zinc calcine by selective reduction roasting

Cited by 57 publications

References 25 publications

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Research on Behavior of Iron in the Zinc Sulfide Pressure Leaching Process

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