Lead removal from tin chloride solution by barium sulfate and coprecipitation of (BaxPby)(SO4)2 for the processing of PbSn smelter slag

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Lining Yu, Huazhen Cao, Huibin Zhang, Junfeng Kong, Weilun Qian, Anyang Tang, Wenyu Feng, Guoqu Zheng
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Abstract

Owing to the characteristics of mineral paragenesis (equilibrium sequence of mineral phases), the hydrochloric acid leach liquors of Sn ores and Sn-containing waste materials typically contain large amounts of Pb. In this study, barium sulfate coprecipitation was employed to efficiently remove Pb from a tin chloride solution. The lead removal efficiency, reaction mechanism, and limitations were investigated by varying the Cl and SO42− concentrations. The results showed that the structural formula of the precipitates was (BaxPby)(SO4)2 (x + y = 2), and its solubility product was in the range of 1 × 10−12–1 × 10−13, indicating that Pb2+ and Ba2+ were more easily precipitated in the form of complex salts. In addition, thermodynamic analysis revealed that when the Cl concentration was <1 mol/L in the Pb2+–Sn2+–Cl–H2O system, [Pb2+] and [PbCl+] were the primary species. These positively charged species were readily adsorbed onto the surface of BaSO4 via electrostatic forces, resulting in a significant increase in the Pb content of (BaxPby)(SO4)2. Therefore, the Pb removal efficiency significantly improved as Cl concentration decreased. The lead removal mechanism involves a combination of adsorption and replacement processes. Based on the aforementioned fundamental study, a method involving dechlorination and coprecipitation was proposed to remove lead from an acid leaching solution of Kaldo slag. With the dechlorination via distillation, the Pb removal efficiency could reach 99.9% at 1 mol/L Cl and 0.5 mol/L SO42−.

利用硫酸钡和共沉淀 (BaxPby)(SO4)2 从氯化锡溶液中去除铅,以处理锡铅冶炼渣
由于矿物成因(矿物相的平衡序列)的特点,锡矿石和含锡废料的盐酸浸出液通常含有大量的铅。本研究采用硫酸钡共沉淀法高效去除氯化锡溶液中的铅。通过改变 Cl- 和 SO42- 的浓度,研究了除铅效率、反应机理和限制因素。结果表明,沉淀物的结构式为 (BaxPby)(SO4)2(x + y = 2),其溶度积在 1 × 10-12-1 × 10-13 之间,表明 Pb2+ 和 Ba2+ 更容易以复合盐的形式沉淀。此外,热力学分析表明,当 Pb2+-Sn2+-Cl--H2O 体系中的 Cl- 浓度为 1 mol/L 时,[Pb2+] 和 [PbCl+] 是主要的物种。这些带正电荷的物种很容易通过静电力吸附到 BaSO4 表面,导致 (BaxPby)(SO4)2 中的铅含量显著增加。因此,随着 Cl- 浓度的降低,铅的去除效率显著提高。除铅机理涉及吸附和置换过程的结合。在上述基础研究的基础上,提出了一种涉及脱氯和共沉淀的方法来去除卡尔多矿渣酸浸出液中的铅。通过蒸馏脱氯,在 1 摩尔/升 Cl- 和 0.5 摩尔/升 SO42- 的条件下,铅的去除率可达 99.9%。
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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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