钼酸铵生产中工业废水的综合治理(Ⅰ)

Overall Treatment of Process Effluent from Ammonium Molybdate

研究了加硫化氨用氨水调节pH值的方法处理钼酸铵生产中的酸性废水。在合适的条件下,废水中重金属铜、铅、锌、铁90%以上被沉淀后除去,98%以上的钼共沉淀进入渣中;沉淀渣再用氨水溶解,84 59%的钼转化为钼酸铵溶液,而渣中的铁、铜、铅基本不溶,锌有部分进入钼酸铵溶液中,此溶液可直接返回钼酸铵的主流程中;经沉淀处理后的酸性废水,再经处理除去碱金属离子后,可结晶生产硝酸铵。

Study is made of the treatment of acid effluent from ammonium molybdate plant by addition of ammonium sulfide and pH value control with ammonia spirit.Under proper condition,over 90% of heavy metals Cu,Pb,Zn,Fe in the effluent are precipitated and removed,>98% Mo coprecipitated into the residue.Then,the precipitation residue is dissolved by ammonia spirit with 84.59% Mo converted into ammonium molybdate solution,while Fe,Cu,Pb in the residue are basically insoluable,part of Zn going to ammornium molybdate solution ,which can go directly back to the main circuit of ammonium moybdate.The treated acid effluent is retreated for removal of alkali metal ion before crystalized to produce ammonium nitrate.