含铬污泥酸浸出液中铬离子和铁离子的分离

Study on Separation of Chromium Ion and Iron Ion in Acid Extracting Solution of Chromium Sludge

考察了含铬污泥酸浸出液中铬离子和铁离子的分离方法。采用盐酸溶液将污泥中的铬浸出后,以草酸为沉淀剂对浸出液中的铁进行沉淀,从而将溶液中的铬和铁进行分离。当草酸过量25%、终点p H为3.0、沉淀温度为25℃时,除铁率可达99%以上,铬损失率小于5%。该方法用于污泥处理,可实现铬、铁分离。

Separation method of chromium ion and iron ion in acid extracting solution of chromium sludge was investigated. After extracting in the sludge by hydrochloric acid solution,the iron was precipitated with oxalic acid as the precipitating agent to separate chromium and iron. When oxalic acid is added in excess of 25%,p H at the end is 3.0,the precipitation temperature is 25℃,the iron removal rate can reach more than 99%,and chromium loss rate is less than 5%. The method for sludge treatment can achieve the separation of chromium and iron.