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首页> 外文期刊>Hydrometallurgy >Bioleaching of dewatered electroplating sludge for the extraction of base metals using an adapted microbial consortium: Process optimization and kinetics
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Bioleaching of dewatered electroplating sludge for the extraction of base metals using an adapted microbial consortium: Process optimization and kinetics

机译：使用适应微生物联盟的脱水电镀污泥的脱水电镀污泥的生物浸渍：工艺优化和动力学

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摘要

The main objective of this study was to optimize bioleaching process parameters for high co-extraction of base metals (Cu, Ni, Zn, and Cr) from hazardous electroplating sludge using an adapted microbial consortium and to explore the relevant bioleaching mechanisms. Microbial cultivation and sludge bioleaching were separated. The effect of the relevant process parameters (i.e., bulk pH, pulp density, and Fe2+ concentration) on the extraction of four selected metals through bioleaching by an adapted microbial consortium was investigated in a 1 L stirred tank reactor. Results indicated that maximum metal solubilization (> 95.6% for each of Cu, Zn, and Ni, and 90.3% of Cr) was achieved at a bulk pH of 2.0, Fe2+ of 9.0 g/L, and pulp density of 15% (w/v). Bioleaching kinetics of the selected metals was described by a modified shrinking core model. This indicated that the interfacial transfer and diffusion across the solid film layer was the rate controlling step and controlled the dissolution kinetics. Data from bioleaching and chemical leaching systems showed that bioleaching had some advantages over simple chemical leaching. The mechanisms of improved Cu, Ni, Zn, and Cr extraction by bioleaching were demonstrated. Bioleaching improved metal release, especially from the residual fraction, as indicated by Community Bureau of Reference (BCR) three-stage sequential extraction analysis. Most of the Cu, Ni, and Zn extraction was attributed to H+ attack, as these metals were primarily distributed in the water/acid soluble and exchangeable fractions, along with Fe and Mn oxyhydroxides (> 72.3%). For the extraction of Cr, besides H+, microorganisms and Fe3+ were also responsible. They improved Cr extraction, especially from the residual fraction. These findings indicate that bioleaching with an adapted microbial consortium appears promising for recycling and reutilizing valuable heavy metals from hazardous electroplating waste.
机译：本研究的主要目的是优化使用适应的微生物联盟的危险电镀污泥的高共同提取基础金属（Cu，Ni，Zn和Cr）的生物浸出工艺参数，并探索相关的生物浸入机制。分离微生物栽培和污泥生物浸润。在1L搅拌釜反应器中，研究了相关工艺参数（即，本体pH，纸浆密度和Fe2 +浓度的效果通过通过改进的微生物联盟的生物浸出来提取四种选定金属。结果表明，在2.0，Fe2 +的9.0g / L和纸浆密度为15％（W. / v）。通过改进的缩小核心模型描述了所选金属的生物浸出动力学。这表明穿过固体膜层的界面转移和扩散是速率控制步骤并控制溶解动力学。来自生物浸入和化学浸出系统的数据表明，生物浸出与简单的化学浸出有一些优势。证明了通过生物浸出的改进的Cu，Ni，Zn和Cr提取的机制。生物浸入改进的金属释放，特别是从残留部分，如社区参考（BCR）三阶段顺序提取分析所示。大多数Cu，Ni和Zn萃取归因于H +攻击，因为这些金属主要分布在水/酸可溶和可交换的级分中，以及Fe和Mn羟基氧化物（> 72.3％）。除了H +，除了H +，微生物和Fe3 +也负责。它们改善了Cr提取，尤其是残留部分。这些发现表明，具有适应性微生物联盟的生物浸出似乎有望从危险电镀废物中回收和再利用有价值的重金属。

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  • 来源
    《Hydrometallurgy》 |2020年第2020期|共12页
  • 作者

    Zhang Lijuan; Zhou Wenbo; Liu Yongdi; Jia Honghua; Zhou Jun; Wei Ping; Zhou Hongbo;

  • 作者单位

    Nanjing Inst Technol Sch Environm Engn Nanjing 211167 Peoples R China;

    Cent South Univ Sch Minerals Proc &

    Bioengn Key Lab Biomet Minist Educ Changsha 410083 Peoples R China;

    Nanjing Tech Univ Fac Biotechnol &

    Pharmaceut Engn Nanjing 211816 Peoples R China;

    Nanjing Tech Univ Fac Biotechnol &

    Pharmaceut Engn Nanjing 211816 Peoples R China;

    Nanjing Tech Univ Fac Biotechnol &

    Pharmaceut Engn Nanjing 211816 Peoples R China;

    Nanjing Tech Univ Fac Biotechnol &

    Pharmaceut Engn Nanjing 211816 Peoples R China;

    Cent South Univ Sch Minerals Proc &

    Bioengn Key Lab Biomet Minist Educ Changsha 410083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金技术;
  • 关键词

    Bioleaching; Heavy metals; Electroplating sludge; Kinetics; BCR sequential extraction;

    机译：生物浸润;重金属;电镀污泥;动力学;BCR连续提取;

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