Recovery of zinc from a low-grade zinc oxide ore with high silicon by sulfuric acid curing and water leaching

Zhang, Yadong; Ye, Hua; Gao, Xiao-Bing; Xu, Cunying; Li, Jian; Li, Yan; Zhang, Qibo; Xiong, Lei; Su, Zhaolei; Wang, Mengmeng; Ru, Juanjian

doi:10.1016/j.hydromet.2016.08.010

Cited by 44 publications

(23 citation statements)

References 16 publications

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“…Leaching of copper slag with 2.5 mol/L H 2 SO 4 and 5 mol/L HNO 3 resulted in the formation of a gelatinous phase. The formation of a gelatinous phase causing problems during leaching and filtration was also reported in earlier studies investigating leaching of various types of slags with H 2 SO 4 [26][27][28].…”

Section: Discussionsupporting

confidence: 65%

Efficiency of Chemical and Biological Leaching of Copper Slag for the Recovery of Metals and Valorisation of the Leach Residue as Raw Material in Cement Production

et al. 2020

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Copper slags produced in vast quantities in smelting operations could be considered as secondary material sources instead of stockpiling them in landfills. This study investigates the recovery of valuable metals from copper slag and the valorisation of the leach residue as construction material in line with the principles of a circular economy. By taking into account that the environmental characterization of the as-received copper slag did not allow its disposal in landfills without prior treatment, chemical and biological leaching were tested for the recovery of metals. Pre-treatment with acids, namely HNO3 and H2SO4, resulted in the extraction of several target metals and the production of an almost inert waste. Despite the clearly better oxidative conditions prevailing in the bioleaching reactors, chemical leaching resulted in the higher dissolution of Cu (71% vs. 51%), Co (70% vs. 36%), and Zn (65% vs. 44%). The acid consumption was much lower during the bioleaching experiments compared to the chemical leaching. The bioleach residue was suitable for its use as supplementary cementitious material, showing a better performance than the reference sample without causing any detrimental effects to the calcium aluminate cement (CAC) quality. The complete valorisation of copper slags is expected to improve the economics of the process, by avoiding landfill costs and producing saleable products with high added value.

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Section: Discussionsupporting

confidence: 65%

Efficiency of Chemical and Biological Leaching of Copper Slag for the Recovery of Metals and Valorisation of the Leach Residue as Raw Material in Cement Production

et al. 2020

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“…H 4 SiO 4 and H 3 SiO 4 − , formed during the decomposition of silicate compounds (Hamouda and Amiri, 2014;Kokhanenko et al, 2016;Tobler et al, 2009). Silica gel formation represents a serious drawback in hydrometallurgy because the gel solutions can no longer be filtered (Abkhoshk et al, 2014;Alkan et al, 2018a;Queneau and Berthold, 1986;Shi et al, 2017;Zhang et al, 2016). Meanwhile, a high co-dissolution of aluminium and iron can significantly decrease the efficiency of the further separation process, e.g., solvent extraction and/or ion exchange, to recover selectively the REEs due to their co-adsorption to the ion-exchange resins (Wang et al, 2011).…”

Section: Characterisation Of the Bauxite Residue And Slagsmentioning

confidence: 99%

Selective rare earth element extraction using high-pressure acid leaching of slags arising from the smelting of bauxite residue

et al. 2019

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During acid leaching of bauxite residue (red mud), the increase in dissolution of rare-earth elements (REEs) is associated with a substantial co-dissolution of iron; this poses problems in the downstream processing (i.e. solvent extraction or ion exchange). Six different slags generated by reductive smelting of the same bauxite residue sample were treated by high-pressure acid leaching (HPAL) with HCl and H 2 SO 4 to selectively extract REEs. Thus, up to 90 wt% of scandium was extracted from the slags using H 2 SO 4 at 150°C, while with HCl the extraction of scandium reached up to 80 wt% at 120°C. The extraction of yttrium, lanthanum and neodymium was above 95 wt% when HCl was used as a reagent, but it was much lower (< 20 wt%) with H 2 SO 4 , presumably due to the formation of a double sulfate (NaLn(SO 4 ) 2 ⋅nH 2 O) and/or due to the adsorption on the surface of silicon/aluminium-oxides compounds. In addition, HPAL of bauxite residue slags led to a significant co-dissolution of aluminium (> 90 wt%, 18 g L −1 ), while the concentration of the remaining iron (> 60 wt%) was of 3 g L −1 in the leachate. The co-dissolution of silicon and titanium was lower than 5 wt%.

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“…Polymerisation of silica represents a common problem during leaching of silicate minerals (Abkhoshk et al, 2014;Shi et al, 2016;Zhang et al, 2016), which may be promoted by low pH values and high temperatures (Voßenkaul et al, 2016), resulting in problems of solid-liquid separation that increase the required acid consumption and affect the selective recovery of metals. Figure 15 describes the extraction behaviour of Sc and Y from the highly neutralised sample as function of Al, Fe and Ti dissolution.…”

Section: Leaching Of Neutralised Bauxite Residuementioning

confidence: 99%

Neutralisation of bauxite residue by carbon dioxide prior to acidic leaching for metal recovery

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Gerven

et al. 2017

Minerals Engineering

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Recovery of zinc from a low-grade zinc oxide ore with high silicon by sulfuric acid curing and water leaching

Cited by 44 publications

References 16 publications

Efficiency of Chemical and Biological Leaching of Copper Slag for the Recovery of Metals and Valorisation of the Leach Residue as Raw Material in Cement Production

Efficiency of Chemical and Biological Leaching of Copper Slag for the Recovery of Metals and Valorisation of the Leach Residue as Raw Material in Cement Production

Selective rare earth element extraction using high-pressure acid leaching of slags arising from the smelting of bauxite residue

Neutralisation of bauxite residue by carbon dioxide prior to acidic leaching for metal recovery

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