Sustainable Mining and Metallurgy

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.