Research on the effect of alkali roasting of copper dross on leaching rate of indium

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Dafang, Liu^1,3 ; Fan, Xingxiang^2 ; Shi, Yifeng^3 ; Yang, Kunbin^3

Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan

650093, China^1

Faculty of Metallurgical Material, Kunming Metallurgy College, Kunming, Yunnan

650033, China^2

Yunnan Copper Co., Ltd, Kunming, Yunnan

650102, China^3

关键词: Acid consumption;    Copper and zinc;    Fluorescence spectrometers;    Leaching rates;    Oxidation roasting;    Refining crude;    Roasting temperature;    Water leaching;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012123/pdf
DOI  :  10.1088/1755-1315/94/1/012123

来源: IOP

【 摘 要 】

The byproduct copper dross produced during refining crude lead was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and fluorescence spectrometer (XRF), which showed that copper dross mainly contained lead, copper, zinc, arsenic, antimony, bismuth, sulfur and a small amount of indium and silver etc. The mineralogical phase change of oxidation roasting of copper dross by adding sodium hydroxide was analyzed with the help of XRD and SEM. The effects of water leaching, ratio of sodium hydroxide, roasting time, and roasting temperature on leaching rate of indium were investigated mainly. The experimental results showed that phase of lead metal and sulfides of lead, copper and zinc disappeared after oxidation roasting of copper dross by adding sodium hydroxide, new phase of oxides of lead, copper, zinc and sodium salt of arsenic and antimony appeared. Water leaching could remove arsenic, and acid leaching residue obtained was then leached with acid. The leaching rate of indium was higher 6.98% compared with alkali roasting of copper dross-acid leaching. It showed that removing arsenic by water leaching and acid leaching could increase the leaching rate of indium and be beneficial to reducing subsequent acid consumption of extracting indium by acid leaching. The roasting temperature had a significant effect on the leaching rate of indium, and leaching rate of indium increased with the rise of roasting temperature. When roasting temperature ranged from 450°C to 600°C, leaching rate of indium increased significantly with the rise of roasting temperature. When roasting temperature rose from 450°C to 600°C, leaching rate of indium increased by 60.29%. The amount of sodium hydroxide had an significant effect on the leaching rate of indium, and the leaching of indium increased with the increase of the amount of sodium hydroxide, and the leaching rate of indium was obviously higher than that of copper dross blank roasting and acid leaching.