河南某硫酸烧渣制备氯化铁铵的试验研究

Preparation of Ammonium Ferric Chloride from a Pyrite Cinder in Henan Province

以河南某硫酸烧渣为原料,采用盐酸浸出-浓缩净化-氯化铵诱导-冷却结晶工艺制备优级纯氯化铁铵晶体。实验所得最佳工艺条件为:盐酸溶液浓度40%、液固比8∶1、浸出温度85℃、浸出时间40 min、氯化铵过量系数0.9,此条件下原料中铁浸出率为91.43%,所制备的氯化铁铵纯度达到99.85%。

A high-grade pure ammonium ferric chloride crystals was successfully prepared with a kind of pyrite cinder from Henan Province as the raw material by adopting a process consisting of hydrochloric acid leaching,concentration and purification,ammonium chloride induction and cooling crystallization.The optimal process conditions were obtained based on the experiment results,including hydrochloric acid concentration of 40%,the liquid-solid ratio at 8∶1,the leaching temperature at 85℃,the leaching time of 40 min and the excess coefficient of ammonium chloride at 0.9.It is shown that under the optimal conditions,the iron leaching rate from the raw materials is 91.43%,and the purity of the ferric ammonium chloride can reach 99.85%.