拜耳法溶出条件下含硫脱硅产物的形成和转化  

Formation and transformation mechanism of sulfur-containing desiliconization products under simulated Bayer digestion conditions

作　　者：李小斌 席亚伟 王一霖 齐天贵 刘桂华 周秋生 彭志宏 LI Xiao-bin;XI Ya-wei;WANG Yi-lin;QI Tian-gui;LIU Gui-hua;ZHOU Qiu-sheng;PENG Zhi-hong(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Powder Metallurgy Research Institute,Central South University,Changsha,410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]中南大学粉末冶金研究院,长沙410083

出　　处：《中国有色金属学报》2020年第8期1906-1914,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51604309,51804142);中国博士后科学基金资助项目(2019M652799)。

摘　　要：结合物相和成分分析结果,阐明了模拟拜耳法溶出条件下含硫脱硅产物(S-DSP)的形成和转化机制。结果表明:不同含硫离子参与形成的S-DSP中硫含量和脱硫率由大到小的顺序为S2O3^2-、SO4^2-、SO32^-、S^2-,且S2O3^2-和SO4^2-能够显著促进方钠石向钙霞石的转化。S-DSP中硫含量与钙霞石含量线性相关,即含硫离子嵌入过程发生在含硅物相溶解、成核、长大过程中。当溶液初始S2O3^2-含量为2.4 g/L、w(S)/w(SiO2)=0.13时,S-DSP可以脱除铝酸钠溶液中63%的硫。The formation and transformation mechanisms of sulfur-containing desiliconization products(S-DSP)were studied under simulated Bayer digestion conditions by analyzing the phase and composition changes.The results show that the sulfur content and desulfurization rate of S-DSP decrease following the order of S2O3^2-,SO4^2-,SO3^2-and S^2-.Meanwhile,S2O3^2- and SO4^2-markedly promote the transformation of sodalite to cancrinite.The sulfur content in S-DSP is linearly correlated with the cancrinite transformation rate,indicating that the S-DSP forms through a nucleation and growth process.63%of the total sulfur is removed from a simulated S2O3^2--bearing Bayer liquor(ρ0(S)=2.4 g/L,w(S)/w(SiO2)=0.13)by incorporating sulfur-bearing ions into desiliconization products.This progress provides a theoretical basis for the treatment of high-sulfur bauxite by lime-free Bayer digestion process.

关 键 词：高硫铝土矿 含硫离子 方钠石 钙霞石 拜耳法 

分 类 号：TF802[冶金工程—有色金属冶金]