High-Zinc Recovery from Residues by Sulfate Roasting and Water Leaching

Hu, Ming; Peng, Bing; Chai, Liyuan; Li, Yanchun; Peng, Ning; Yuan, Ying-zhen; Chen, Dong

doi:10.1007/s11837-015-1483-8

Cited by 16 publications

(6 citation statements)

References 27 publications

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“…The recovery rate of zinc reaches 99% at 600 °C and then gradually decreases with the temperature increase. Therefore, it can be stated clearly that sulfating of zinc minerals in ZPR, namely, zinc ferrite, zinc oxide, zinc sulfide and zinc silicate, are possible almost completely according to the reaction (4), as well as the following reactions [ 42 ]: ZnS (s) + 2O 2(g) = ZnSO 4(s) ZnO (s) + SO 3(g) = ZnSO 4(s) Zn 2 SiO 4(s) + 2SO 3(g) = 2ZnSO 4(s) + SiO 2(s) …”

Section: Resultsmentioning

confidence: 99%

“…The main advantages are relatively low roasting temperature range, lack of fuel consumption due to exothermic sulfating reactions [ 41 ], the application of water leaching rather than acid leaching after the roasting to extract zinc and other valuable components. Some authors have studied iron sulfates as sulfating agents for roasting of zinc ferrite residues [ 42 , 43 ], copper slag [ 44 , 45 ], copper tailings [ 46 , 47 ] and electric arc furnace dust from steelmaking [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

et al. 2021

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Zinc plant residue (ZPR) is a secondary material generated during hydrometallurgical zinc production that contains considerable contents of valuable elements such as Zn, Cu, Fe, Pb, Cd, Ag, In, Ga, Tl. Zinc, copper and accompanying elements in ZPR are in different minerals, mainly in the ferrites. A promising approach for recycling ZPR is the sulfating roasting using iron sulfates followed by water leaching. In this study, the composition of ZPR and the obtained products were thoroughly investigated by various methods including X-ray diffraction analysis (XRD), chemical phase analysis and Mössbauer spectroscopy. The effect of temperature, amount of iron sulfates and roasting time on the conversion of valuable metals into a water-soluble form was thermodynamically and experimentally studied both using pure ferrites and ZPR. Based on the results of time-resolved XRD analysis and synchronous thermal analysis (STA), a mechanism of the sulfation roasting was elucidated. The rate-controlling step of zinc and copper sulfation process during the ZPR roasting was estimated. The sulfating roasting at 600 °C during 180 min with the optimal Fe2(SO4)3∙9H2O addition followed by water leaching enables to recover 99% Zn and 80.3% Cu, while Fe, Pb, Ag, In, Ga retained almost fully in the residue.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

et al. 2021

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“…Zinc slag therefore provides an important source of indium. [7][8][9] Several processes have been proposed for recovering indium from zinc slag. Dai et al 10 reported a process for extracting indium that involved neutral leaching, concentrated sulfuric acid curing leaching, and alkali leaching; a 99.7% indium leaching ratio was achieved.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Indium from Hard Zinc Slag by Pressure Leaching and Solvent Extraction

Deng

Wei

et al. 2021

JOM

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In this study, hydrometallurgical processes involving pressure acid leaching and solvent extraction were developed to aid recovery of indium from zinc slag, which is produced in the imperial smelting process. Four different acid leaching methods were studied, namely atmospheric leaching, atmospheric leaching with KMnO 4 , roasting-atmospheric leaching, and oxygen pressure leaching in a sulfuric acid medium. Oxygen pressure acid leaching is the most effective method for indium extraction, and 94.1% of indium was leached under the optimum conditions, i.e., 300 g/L H 2 SO 4 ,oxygen pressure 0.4 MPa, liquid/solid ratio 10 mL/g, and temperature 100°C for 5 h. X-ray diffraction and scanning electron microscopy examination of the raw material and leaching residue samples indicated that the intermetallic compounds Cu 5 Zn 8 and Cu 2 Zn, metallic zinc, and iron in the raw material dissolved, leaving the insoluble components PbSO 4 and Pb as the major compounds in the leaching residue. A 98.5% proportion of the indium in the leaching solution was selectively extracted with 30% bis(2-ethylhexyl) phosphate and 70% kerosene by three-stage counter-current extraction, and 99.5% of the indium in the loaded organic phase was stripped by 6 mol/L HCl through four-stage countercurrent stripping. The overall recovery yield of indium through all processes was approximately 92%.

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“…Some authors have studied methods of sulphatizing of ZLR by roasting with elemental sulfur in air [16], with oleum [17], with sulphuric acid [18,19]. In recent years some authors have tested iron sulphates FeSO4 and Fe2(SO4)3 as sulphatizing agents for ZLR roasting [20,21]. In this paper, we consider characteristics of the approach of ZLR sulphatizing roasting in the presence of iron sulphates in order to convert zinc and copper compounds into the water-soluble sulphate form, and transform iron into water-insoluble form.…”

Section: Introductionmentioning

confidence: 99%

Study of Sulphatizing Roasting Process Using Iron Sulphates for the Treatment of Zinc Leach Residue

Grudinsky

Podjelnikova

Dyubanov

2020

MSF

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The paper presents the results of the investigation of zinc leach residue (ZLR) processing by sulphatizing roasting with iron sulphates FeSO4 and Fe2(SO4)3 followed by water leaching. The elemental and phase compositions of ZLR of JSC "Chelyabinsk Zinc Plant" were studied. Based on the thermodynamic calculations using HSC Chemistry 9.9 software, the temperature ranges of the sulphatizing roasting and the required amounts of iron sulphate additives for the sulphation of zinc and copper were determined. Subsequent experiments showed that recovery rates of zinc and copper reached 99.5% and 89.1% respectively, while iron remained in the leached residue. The results have indicated a high efficiency of sulphatizing roasting to transform zinc and copper contained in ZLR from ferrite to water-soluble sulphate.

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High-Zinc Recovery from Residues by Sulfate Roasting and Water Leaching

Cited by 16 publications

References 27 publications

Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

Recovery of Indium from Hard Zinc Slag by Pressure Leaching and Solvent Extraction

Study of Sulphatizing Roasting Process Using Iron Sulphates for the Treatment of Zinc Leach Residue

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