铜烟灰酸浸—磁选联合预处理及酸浸液选择性沉砷研究

发布时间：2018-03-15 11:32

  本文选题：铜烟灰　切入点：磁选　出处：《江西理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：铜火法冶炼过程产生大量烟灰,其中含有Cu、Fe、Pb、Zn等多种有价金属,同时含有As、Cd等有害元素。铜烟灰综合利用一直受到企业和科研工作者关注,但传统处理方法仍然存在工艺流程长、有价元素回收率低、有害物质难于开路等难题。论文探索铜烟灰选冶联合预处理技术,同时开展高砷浸出液高效脱砷试验研究,对铜烟灰的绿色高效综合利用技术发展具有重要的理论意义和现实价值。论文根据铜烟灰的化学组成和物相特征,研究酸浸—磁选联合预处理铜烟灰技术,将铁富集到磁选渣,铜、砷、镉等浸出进入浸出液,探索了硫酸初始浓度、液固比、反应温度、反应时间、磁感应强度等参数对各金属浸出率、磁选渣铁含量的影响。实验结果表明,当硫酸初始浓度为0.50 mol·L-1、液固比为L/S=6、反应温度T=65℃、反应时间t=1.5 h时,铜、砷、镉浸出率分别为48.47%、90.01%和90.14%,铁只有12.56%进入浸出液、约85%进入磁选渣,浸出渣含铅54%、含铋5.20%。实现了烟灰中铁的有效富集和开路,有效减少了大量铁对后续回收处理带来的困难。对酸浸—磁选得到的高砷酸浸液进行了选择性沉砷研究,研制了选择性脱砷剂A,最佳条件为:A加入量60g·L-1、H2O2加入量180mL·L-1、反应时间60 min、反应温度65℃、陈化时间30 min,此时,砷脱除率达95.07%,铜、镉分别只有2.83%和2.88%进入富砷渣,表明脱砷剂A具有很好的选择性沉砷效果。对富砷渣开展了碱溶再生脱砷剂的实验研究,当碱溶温度为75℃、NaOH用量为理论用量的3.13倍、碱溶时间为45 min、液固比为6:1时,富砷渣中97.31%的As被脱除,实现了脱砷剂的再生。在最佳浸出液脱砷条件下,将60g·L-1的再生脱砷剂和15 g·L-1新鲜脱砷剂A加入到新鲜的高砷酸浸液中,砷脱除率为95.68%,表明,经过再生得到的脱砷剂能够实现循环使用。
[Abstract]:A large amount of soot is produced in the copper pyrometallurgical process, which contains many valuable metals, such as Cu, Fe, Pb, Zn, and so on, as well as harmful elements such as Ash and CD. The comprehensive utilization of copper soot ash has been concerned by enterprises and researchers, but the traditional treatment method still has a long process flow. The recovery rate of valuable elements is low, the harmful substances are difficult to open the circuit and so on. This paper explores the combined pretreatment technology of copper soot ash processing and metallurgy, and carries out high efficiency arsenic removal test of high arsenic leaching solution. It has important theoretical significance and practical value for the development of green and efficient comprehensive utilization technology of copper soot ash. According to the chemical composition and phase characteristics of copper soot ash, this paper studies the technology of combined pretreatment of copper soot ash with acid leaching and magnetic separation, and concentrates iron into magnetic separation slag. The effects of initial concentration of sulfuric acid, liquid-solid ratio, reaction temperature, reaction time and magnetic induction intensity on the leaching rate and the content of iron in magnetic separation slag were investigated. When the initial concentration of sulfuric acid is 0.50 mol 路L ~ (-1), the ratio of liquid to solid is L / S _ (6), the reaction temperature is 65 鈩，

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