Effects of electrolyte recycling on desulfurization from bauxite water slurry electrolysis  

电解液循环对铝土矿电解脱硫的影响（英文）

作　　者：吕艾静 沈羿麒 公旭中[1] 王志[1] 汪玉华[1] 王明涌[1] 

机构地区：[1]中国科学院过程工程研究所湿法冶金清洁生产国家工程实验室,中国科学院绿色过程工程实验室,北京100190 [2]辽宁工程技术大学环境科学与工程学院,阜新123000

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第6期1714-1720,共7页中国有色金属学报（英文版）

基　　金：Projects(51004090,51474198)supported by the National Natural Science Foundation of China;Project(KF13-03)supported by State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing;Project(2015036)supported by Youth Innovation Promotion Association,Chinese Academy of Sciences

摘　　要：To lower the cost of bauxite electrolysis desulfurization using NaOH solution as the supporting electrolyte, effects of electrolyte recycling on bauxite electrolysis desulfurization were investigated. The results indicate that electrode corrosion, cell voltage, the desulfurization rate and the pH value of the electrolyte have no obvious changes with the increase of cycle times. Additionally, there were some transitive valence S-containing ions in electrolyte after the electrolysis, such as SO3^2-,S2O3^2- . However, most of the sulfur in bauxite was eventually oxidized into SO4^2- into the electrolyte, and these S-containing ions did not affect the recycling utilization for electrolyte.为了降低电解脱硫成本,采用NaOH溶液作为电解液,研究电解液循环对铝土矿电解过程的影响。研究发现随着电解液循环次数增多,电极腐蚀程度、电解电压、脱硫率及母液p H值均无明显变化。另外,电解后电解液中含有一些过渡态的含硫离子,如S_2O_3^(2-)和SO_3^(2-),最终被氧化为SO_4^(2-)溶于水中,这些离子的生成不影响电解液的回收利用。

关 键 词：high sulfur bauxite ELECTROLYSIS DESULFURIZATION ELECTROLYTE RECYCLING 

分 类 号：TF821[冶金工程—有色金属冶金]