钼酸铵生产线废水处理工艺探讨

Discussion on Wastewater Treatment Technology of Ammonium Molybdate Production Line

传统酸盐洗预处理钼酸铵生产工艺多使用强酸对工业氧化钼进行预处理,其废水中含有未反应的强酸、氮氧化物及重金属等物质,通常采用化学沉淀法进行处理,容易造成二次污染。通过对酸盐预处理工艺的钼酸铵生产线废水进行蒸发浓缩、化学沉淀处理,有效去除了废水中的酸和金属离子,产生的蒸发冷凝液和反应除杂滤液可返回酸洗工序循环利用,降低了酸盐预处理工艺的环保风险,提升了酸盐预处理工艺在钼酸铵生产中的优势。

For the traditional production process adopting acid salt washing method to pretreat the ammonium molybdate,strong acid is mostly used to pretreat industrial molybdenum oxide.The wastewater generated from such process contains unreacted strong acid,nitrogen oxides and heavy metals,which are usually treated by chemical precipitation method and such method is easy to cause secondary pollution.Through evaporative thickening and chemical precipitation of the wastewater generated from the ammonium molybdate production line which adopts acid salt pretreatment process,the acid and metal ions are effectively removed,while the generated evaporation condensate and the filtrate resulting from impurity removal can be returned to the acid washing process for recycle,thereby reducing the risk in terms of environmental protection of the acid salt pretreatment process and promoting the advantages of this process in ammonium molybdate production process.