中南大学学报（自然科学版）2016，Vol.47Issue(12)：3981-3987,7.DOI:10.11817/j.issn.1672-7207.2016.12.003
炼锌窑渣铁精矿HCl浸出过程中硅的行为研究
Study on silicon behaviors in HCl leaching of iron concentrate recovered from zinc kiln slag
摘要
Abstract
The behaviors of silicon in the hydrochloric acid leaching of iron concentrate recovered from zinc kiln slag were investigated through both thermodynamic calculations and experimental studies. The results show that the variation of total chloride concentration [Cl−]T has little impact on the solubility of FeSiO3 when pH is less than 10, while the solubility of FeSiO3 gradually increases with the increase of total chloride concentration when pH is less than 10. The predominance areas of Fe2+ and Fe(OH)+ are replaced by those of FeCl+and FeCl2(aq) correspondingly. In addition, the precipitation pH of SiO2 increases from 0.73 to 1.31 when the concentration of hydrochloric acid increases from 0 mol/L to 6 mol/L. The leaching of silicon and metal values increases with the increase of leaching temperature and the concentration of hydrochloric acid. However, silicon dissolved in leaching solution will be precipitated significantly as amorphous SiO2 when the concentration of hydrochloric acid increases more than 5 mol/L, which is consistent with the thermodynamics results. The precipitation of silicon adsorbs or encapsulates on the surface of iron concentrate particles by amorphous SiO2, which leads to the decrease of leaching rate of metal.关键词
浸出行为/硅/湿法炼锌/窑渣/盐酸浸出Key words
leaching behaviors/silicon/zinc hydrometallurgy/kiln slag/hydrochloric acid leaching分类
矿业与冶金引用本文复制引用
王红军,刘志宏,张文海,李启厚,何仕超,李思唯,刘智勇..炼锌窑渣铁精矿HCl浸出过程中硅的行为研究[J].中南大学学报（自然科学版）,2016,47(12):3981-3987,7.基金项目
国家自然科学基金资助项目(51574285，51404307)(Projects(51574285,51404307) supported by the National Natural Science Foundation of China) （51574285，51404307）
