含碘废液中碘的回收  

Iodine recovery from Iodine-containing wastewater

作　　者：魏剑英[1] 许炎妹[1] 韩周祥[1] 岳庆先[2] 

机构地区：[1]郑州轻工业学院材料与化工学院,河南郑州450002 [2]郑州二中

出　　处：《无机盐工业》2007年第9期47-49,共3页Inorganic Chemicals Industry

摘　　要：研究了含碘废液中的碘的回收方法。采用硫酸铜为沉淀剂、硫代硫酸钠为还原剂、溴化十六烷基三甲基铵为凝聚剂对含碘废液中碘进行快速沉淀分离,将得到的碘化亚铜沉淀分离后,以氯化铁为氧化剂氧化、升华分离碘;对影响沉淀碘的条件、试剂加入顺序、氧化剂的选择和氧化条件进行了讨论;所得的碘用五氧化二磷进行干燥后用碘量法进行了分析。结果表明该方法工艺操作简便,废液处理量大,回收速度快,所用试剂成本低廉、无毒,回收过程中无有害物质产生,对废液中碘的回收率达到96%以上,所得碘的纯度大于98%。This article introduced a method of iodine recovery from the iodine - containing wastewater. CuSO4 , Na2 S2O3 and cetrimonium bromide were respectively used as the precipitator,reducer and flocculant to quickly settle down the iodine from the wastewater as the form of cuprous iodide （ CuI ） deposit. After filtering, FeCl3 was used as the oxidant to oxidize CuI to iodine, and then the obtained iodine was purified by the sublimation. In addition, the conditions affecting on the precipitation of iodine, the sequence of reagent addition, the selection of oxidants and oxidation conditions were discussed in detail in the article. After desiccated by P2O5 the gained iodine was analyzed by the iodometric method. Results showed that this method is characterized by simple operation, large disposal capacity and fast recovery speed. Moreover, during the process, all the applied reagents were cheap, nontoxic and there were no harmful matters produced in the recycle course. The total iodine recovery rate of the wastewater was up to 96% and the purity of obtained iodine was over 98%.

关 键 词：碘 沉淀 氧化 回收 

分 类 号：TQ124.61[化学工程—无机化工]