The invention discloses a method for comprehensive recovery of valuable metals in copper smelting ash. First, the copper smelting ash and low iron ash are obtained by magnetic separation method, and the rich iron slag and copper sulphate solution are obtained by sulfuric acid leaching, and the low iron soot is leaching residue and medium soak through neutral leaching; High lead bismuth slag and acid leaching solution are leached with low acid solution, and acid leaching solution is neutral leaching. The medium soak is reduced to As2O3 and copper sulfate solution by SO2, and copper sulfate is electrodeposited. The invention adopts the magnetic separation preprocessing method to separate the black substance containing a large amount of iron and a small amount of copper in the total amount of ash, reducing the amount of neutral leaching and increasing the content of arsenic in the medium, helping SO2 reducing arsenic, reducing the effect of iron on acid leaching, and greatly improving the acidity of acid leaching. The content of arsenic in low acid leaching residue can be obtained from iron rich slag, high lead bismuth residue and Gao Chuntong, so as to realize comprehensive recovery of valuable metals.
【技术实现步骤摘要】
一种综合回收铜冶炼烟灰中有价金属的方法
本专利技术涉及一种有色金属冶炼过程固废的综合处理方法,特别是选冶联合从铜冶炼烟灰中综合回收有价金属的方法。
技术介绍
铜冶炼过程中产生的大量烟灰中含有Cu、Fe、As、Pb、Zn、Bi等多种有价金属,品位高于一般矿石,具有很高的综合利用价值,其有价金属的综合回收利用一直受到广泛关注。常见的方法有碱性浸出、酸性浸出和火法湿法联合法等。由于在铜冶炼过程中,大多数烟灰返回熔炼系统,当Pb、As较高时才考虑外排,故外排量较小,适合湿法处理工艺。其中以硫酸浸出法应用最为广泛,侯新刚等(从铜转炉烟灰中浸出铜、锌试验研究.湿法冶金,2011,30(1):57-59.)采用硫酸浸出铜转炉烟灰,在硫酸浓度1.80mol/L、液固比7:1、浸出温度70℃条件下浸出1.5h,Cu、Zn的浸出率均达90%以上,Fe、Pb则进入渣中,该法工艺简单、环境污染小利于环保;其缺点是液固比过大、浸出液金属浓度低且Pb与Fe未得到进一步分离富集。孙乐栋等(炼铜烟灰硫酸浸出及铜浸出动力学研究.矿冶工程,2016,36(1):97-100.)研究了硫酸浸出炼铜烟灰 ...
【技术保护点】
一种综合回收铜冶炼烟灰中有价金属的方法,其特征在于,包括以下步骤:a. 磁选将铜冶炼烟灰在0.4‑0.8T的磁感应强度下进行磁选分离,得到富铁烟灰和低铁烟灰;b. 酸浸采用硫酸对富铁烟灰进行酸浸,得到富铁渣和硫酸铜溶液,酸浸条件为:硫酸浓度为1‑5mo/L,硫酸与富铁烟灰的液固比为1:1‑6:1 mL/g,温度为45‑85℃,时间为0.5‑2.0 h;c. 中性浸出采用稀硫酸对低铁烟灰进行中性浸出,得到中性浸渣和中性浸液,中性浸出条件为:稀硫酸浓度为0.1‑0.5mol/L,稀硫酸与低铁烟灰的液固比为1:1‑6:1 mL/g,温度为25‑45℃,时间为0.5‑2.0 h;d ...
【技术特征摘要】
1.一种综合回收铜冶炼烟灰中有价金属的方法,其特征在于,包括以下步骤:a.磁选将铜冶炼烟灰在0.4-0.8T的磁感应强度下进行磁选分离,得到富铁烟灰和低铁烟灰;b.酸浸采用硫酸对富铁烟灰进行酸浸,得到富铁渣和硫酸铜溶液,酸浸条件为:硫酸浓度为1-5mo/L,硫酸与富铁烟灰的液固比为1:1-6:1mL/g,温度为45-85℃,时间为0.5-2.0h;c.中性浸出采用稀硫酸对低铁烟灰进行中性浸出,得到中性浸渣和中性浸液,中性浸出条件为:稀硫酸浓度为0.1-0.5mol/L,稀硫酸与低铁烟灰的液固比为1:1-6:1mL/g,温度为25-45℃,时间为0.5-2.0h;d.还原沉砷将中性浸液进行SO2还原沉砷,得到As2O3和硫酸铜溶液,还原沉砷条件为:SO2通入量为理论量的1-5倍,温度为45-85℃,时间为0.5-2.0h;e.低酸浸出采用低酸液对中性浸渣进行浸出,...
【专利技术属性】
技术研发人员:汪金良,胡华舟,谢凌峰,
申请(专利权)人:江西理工大学,
类型:发明
国别省市:江西,36
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