摘要
锌铜合金灰中含有Cu、Zn、Al、Ni、Sn、Pb等多种有色金属,通过筛分实现不同粒径范围锌铜灰的有效处理,考察了硫酸含量、温度、时间、液固比、转速、氧化剂和焙烧对不同金属选择性浸出的影响。研究结果表明,粒径小于0.15 mm的锌铜灰在750℃下焙烧3 h,再在浸出温度85℃,硫酸含量1.2 g/g灰液固体积质量比5/1、搅拌速度400 r/min、H_(2)O_(2)0.075 mL/g灰的条件下浸出5 h,锌去除率达到93.40%,铜去除率为0.23%,与初始铜灰相比,焙烧浸出后铜灰中的ZnO大量减少;将浸出渣与0.15~0.25 mm粒径范围的铜渣混合,在750℃下焙烧4 h,再在相同条件下,用2 mol/L的硫酸溶液酸洗5 h和水洗的步骤能够去除铜渣中大量的杂质金属元素,酸洗后的铜渣物相组成主要为Cu, Cu元素的比例达到92.52%。
Zinc-copper alloy ash contains Cu,Zn,Al,Ni,Sn,Pb and other non-ferrous metals.In this paper,the effective treatment of zinc-copper ash in different particle size ranges is realized by screening.The effects of sulfuric acid content,temperature,time,liquid-solid ratio,rotation speed,oxidant and roasting conditions on the selective leaching of different metals were investigated.The results show that the zinc-copper ash with particle size less than 0.15 mm is calcined at 750℃for 3 hours,and then leached at 85℃,sulfuric acid content of 1.2 g/g ash,liquid-to-solid ratio of 5/1,stirring speed of 400 r/min,H_(2)O_(2)0.075 mL/g ash for 5 h.The removal rate of zinc is 93.40%,and the removal rate of copper is 0.23%.Compared with the initial copper ash,the ZnO in the copper ash after roasting and leaching is greatly reduced.The leaching residue was mixed with copper slag with a particle size of 0.15~0.25 mm,roasted at 750℃for 4 hours,and then washed with 2 mol/L sulfuric acid solution for 5 hours and washed with water under the same conditions.The steps can remove a large number of impurity metal elements in the copper slag.The phase composition of the copper slag after pickling is mainly Cu,and the proportion of Cu elements reach 92.52%.
作者
温珊
易娟
吴旭
WEN Shan;YI Juan;WU Xu(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei HuaDeLai Co.,Ltd.,Wuhan 430223,China;Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin,School of Environmental Science&Engineering,Huazhong University of Science and Technology(HUST),Wuhan 430074,China)
出处
《有色金属工程》
CAS
北大核心
2024年第6期76-83,共8页
Nonferrous Metals Engineering
基金
国家重点研发计划项目(2022YFC3202700)。
关键词
锌铜合金
筛分
选择性浸出
金属分离
zinc-copper alloy
screening
selective leaching
metal separation
