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球磨辅助碱浸铜冶炼烟灰中砷与有价金属选择性分离

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胡中求, 郭莉, 姚瑛瑛, 杜冬云. 球磨辅助碱浸铜冶炼烟灰中砷与有价金属选择性分离[J]. 环境工程学报, 2018, 12(11): 3243-3250. doi: 10.12030/j.cjee.201806171
引用本文: 胡中求, 郭莉, 姚瑛瑛, 杜冬云. 球磨辅助碱浸铜冶炼烟灰中砷与有价金属选择性分离[J]. 环境工程学报, 2018, 12(11): 3243-3250. doi: 10.12030/j.cjee.201806171
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HU Zhongqiu, GUO Li, YAO Yingying, DU Dongyun. Selective separation of arsenic and valuable metals in copper smelting dust by Na2S-NaOH leaching assisted with ball milling[J]. Chinese Journal of Environmental Engineering, 2018, 12(11): 3243-3250. doi: 10.12030/j.cjee.201806171
Citation: HU Zhongqiu, GUO Li, YAO Yingying, DU Dongyun. Selective separation of arsenic and valuable metals in copper smelting dust by Na2S-NaOH leaching assisted with ball milling[J]. Chinese Journal of Environmental Engineering, 2018, 12(11): 3243-3250. doi: 10.12030/j.cjee.201806171
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球磨辅助碱浸铜冶炼烟灰中砷与有价金属选择性分离

  • 1.

    中南民族大学资源与环境学院，环境科学与工程研究所，武汉 430074

  • 2.

    中国地质大学武汉环境学院，生物地质与环境地质国家重点实验室，武汉 430074

  • 基金项目:

    湖北省科技支撑计划项目（2014BEC029）

Selective separation of arsenic and valuable metals in copper smelting dust by Na2S-NaOH leaching assisted with ball milling

  • 1.

    Institute of Environment Engineering and Science, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China

  • 2.

    State Key Laboratory of Biological Geology and Environmental Geology, School of Environmental Studies, China University of GeosciencesWuhan, Wuhan 430074, China

  • Fund Project:

  • 摘要: 为开发高效的铜冶炼烟灰选择性脱砷技术，采用球磨辅助NaOH-Na2S浸取体系选择性分离As与有价金属，在NaOH、Na2S与烟灰质量比0.4:1、球磨转速350 r·min?1、料球比0.6、液固比20:1、填充系数0.45、反应时间60 min条件下，As浸出率可达85%，Cu、Pb、Cd和Zn浸出率均较低；与传统水浴浸出体系相比，As浸出率提高了11%。SEM表明，球磨后烟灰粒径减小、比表面积增大，表面呈剥蚀状，As浸出过程传质速率增加，反应活性位点增多；XPS表明，球磨后烟灰中6.73% As(III)被氧化为As(V)，进一步促进其浸出；XRD表明，浸出残余固体中Pb、Zn主要为硫化物，球磨可将烟灰中PbSO4转化为PbS，从而加快As选择性分离，故球磨可强化As与有价金属在碱浸体系中的选择性分离，为铜冶炼产生的含砷材料的无害化及资源化提供了理论基础。
    Abstract: In order to develop high-efficiency selective arsenic removal technology from copper smelting soot, a NaOH-Na2S leaching system assisted with ball milling was used to selectively separate As and valuable metals. The highest As leaching rate up to 85% was obtained at rotating speed of 350 r·min?1, liquid-solid ratio of 20:1, material-to-ball ratio of 0.6, volume filling coefficient of 0.45, mass ratio of soot and NaOH of 0.4:1, mass ratio of soot and Na2S of 0.4:1 and 60 min leaching. Meanwhile, Cu, Pb, Cd and Zn showed very low leaching rates. Compared with the leaching process by using conventional water bath, milling ball assist led to 11% increase in As leaching rate. SEM images of ball milled soot particles showed decreased size, increased specific surface area and erosion surface, which caused the increase of the mass transfer rate in As leaching process and active sites for reaction. XPS spectra showed that 6.73% As(III) was oxidized to As(V) in ball milled soot, and As leaching was promoted. XRD patterns showed that the sulphides of Pb and Zn were identified in the residues of copper smelting soot after leaching, which implied that part of the PbSO4 in the soot was converted into PbS by ball milling and subsequently the selective separation of As and valuable metals in the alkali leaching system was enhanced. This study provided a theoretical basis for the harmlessness and resource utilization of arsenic-containing materials produced by copper smelting.
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  • 刊出日期:  2018-11-12

球磨辅助碱浸铜冶炼烟灰中砷与有价金属选择性分离

  • 1. 中南民族大学资源与环境学院，环境科学与工程研究所，武汉 430074
  • 2. 中国地质大学武汉环境学院，生物地质与环境地质国家重点实验室，武汉 430074
基金项目:

湖北省科技支撑计划项目（2014BEC029）

摘要: 为开发高效的铜冶炼烟灰选择性脱砷技术，采用球磨辅助NaOH-Na2S浸取体系选择性分离As与有价金属，在NaOH、Na2S与烟灰质量比0.4:1、球磨转速350 r·min?1、料球比0.6、液固比20:1、填充系数0.45、反应时间60 min条件下，As浸出率可达85%，Cu、Pb、Cd和Zn浸出率均较低；与传统水浴浸出体系相比，As浸出率提高了11%。SEM表明，球磨后烟灰粒径减小、比表面积增大，表面呈剥蚀状，As浸出过程传质速率增加，反应活性位点增多；XPS表明，球磨后烟灰中6.73% As(III)被氧化为As(V)，进一步促进其浸出；XRD表明，浸出残余固体中Pb、Zn主要为硫化物，球磨可将烟灰中PbSO4转化为PbS，从而加快As选择性分离，故球磨可强化As与有价金属在碱浸体系中的选择性分离，为铜冶炼产生的含砷材料的无害化及资源化提供了理论基础。

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