New Process for Molybdenum and Tungsten Extraction from High Pressure Alkaline Leaching Solution

According to the characteristics of high tungsten and molybdenum content in the high pressure alkaline leaching solution of tungsten and molybdenum oxide rough concentrate,a new process for molybdenum-tungsten extraction was adopted including purification with magnesium salt,molybdenum-tungsten co-precipitation,drying,preparation of ammonium molybdate-tungstate.The effects of ammonium chloride dosage,precipitation time,pH,temperature,and solution concentration on molybdenum precipitation rate were investigated.The results show that the final products,i.e.,ammonium molybdate-tungstate,contain 47.57% Mo and 10.13% WO3,respectively,and the impurities of phosphorus and arsenic are 0.0027% and 0.041%,respectively.This product meets requirement of molybdenum-tungsten alloy production.