(1. 湘潭工學院 化工系, 湘潭 411201；
2. 中南大學 化學化工學院, 長沙 410083)
摘 要: 研究了銦的電解精煉中電解液的選擇與配制和酸度對雜質(zhì)錫含量的影響, 并初步探討了電解液中錫離子的行為。 研究表明: 采用
In２(SO4)３H2SO4體系具有組成簡單、 操作方便、 陽極無毒性氣體析出的優(yōu)點。 錫在陰極主要以Sn2+的形式析出, 電解液的酸度控制在pH值2～3之間, 可將錫含量控制在最低水平。 電解過程中, 陰極pH值將增大, 陽極pH值將變小, 可通過加入H2SO4和固體的NaOH顆粒來控制電解液酸度。
關(guān)鍵字: 銦； 電解精煉； 酸度； 錫
（1. Department of Chemical Engineering,
Xiangtan Polytechnic University, Xiangtan 411201, China；
2. College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China）
Abstract:The selection and preparation of electrolyte solution, the change of acidity and the effect of acidity on level of tin in electrorefining indium were investigated, and the behavior of tin ion in electrolyte solution was studied. Electrolyte solution In2(SO4)3H2SO4 is simple and convenient in operation, and the evolution of poisonous gas is avoided on the anode. Sn2+ can be deposited on cathode, but the tin deposition is decreased to lowest at pH 2～3. pH would increase on the cathode region, but decrease on the anode region in electrolytic refining. The method of acidity control by adding sulfuric acid or solid sodium hydrate was described.
Key words: indium； electrolytic refining； acidity； tin
