摘要
在采用湿法炼锌还原浸出后液进行铟的回收过程中,部分锡进入反萃液中,影响后续精铟质量,除锡渣中含有铟、锡等杂质,锡会在系统中逐步富集,影响萃取剂的使用寿命,降低生产效率。本文进行了采用预调pH值-H_(2)O_(2)氧化方法去除反萃后液中锡的研究,分别对终点pH值、双氧水加入量、反应时间等条件进行试验,考查不同条件下的除锡效果,并对除锡渣进行酸浸和碱浸除锡的探索。试验表明,控制铟的反萃液温度为50℃,终点pH为2.0左右,反应时间为1 h,并缓慢加入双氧水,双氧水加入量5 g/L,即可达到铟和锡分离的效果;采用浓硫酸或浓盐酸浸出除锡渣均不能满足铟的浸出要求,且浸出过程中部分锡也被浸出进入溶液,不能实现铟和锡的彻底分离。采用碱浸的方法,控制反应温度为90℃,液固比为3∶1,反应时间为2 h,氢氧化钠加入量达到100 g/L以上时,80%的锡可以从除锡渣中分离出来,进入溶液中,且铟基本不与氢氧化钠反应,留在渣中,实现了铟和锡的彻底分离。
In the process of recovering indium from the post-reduction leaching solution during hydrometallurgical refining of zinc,part of tin enters the stripping solution,which affects the quality of subsequent refined indium.Due to the impurities such as indium and tin in the tin removal residue,tin will be gradually enriched in the system,as to affect the service life of extractant and reduce the production efficiency.In this paper,the removal of tin in the solution after stripping was studied by using the pre-adjustment of pH value-H_(2)O_(2) oxidation method.Condition tests were made on endpoint pH value,amount of hydrogen peroxide added,reaction duration,etc.to investigate the tin removal effects under different conditions,and exploration was made on tin removal from tin removal residue by means of acid leaching and alkali leaching.The results show that the separation of indium and tin can be achieved by controlling the temperature of indium stripping solution at 50℃,endpoint pH at about 2.0,reaction time at 1 h,amount of hydrogen peroxide added at 5 g/L and the hydrogen peroxide being added in a low speed.Using concentrated sulfuric acid or concentrated hydrochloric acid to leach tin removal residue can not meet the requirements of indium leaching,and part of tin is leached into the solution during the process,which cannot realize the complete separation of indium and tin.If alkaline leaching approach is adopted,when the reaction temperature is controlled at 90℃,the liquid to solid ratio at 3∶1,the reaction duration at 2 h and amount of sodium hydroxide added at 100 g/L or more,80%of tin can be separated from tin removal residue and enters the solution,and indium is basically not react with sodium hydroxide and remains in slag,thus realizing the complete separation of indium and tin.
作者
陆开臣
秦绍学
潘辉
刘洪嶂
LU Kai-chen;QIN Shao-xue;PAN Hui;LIU Hong-zhang
出处
《有色冶金节能》
2022年第1期6-9,共4页
Energy Saving of Nonferrous Metallurgy
关键词
湿法炼锌
铟回收
除锡
碱浸
酸浸
hydrometallurgy of zinc
indium recovery
tin removal
alkali leaching
acid leaching
