Hydrochloric Acid Pretreatment-Pyrolusite+Sulfuric Acid Synergistic Leaching Process of Molybdenum Tungsten Ore
In view of the complex structure,difficult flotation and difficult leaching of low-grade mixed tungsten and molybdenum ore of a domestic company,the synergistic leaching of molybdenum and tungsten from molybdenum tungsten ore by hydrochloric acid pretreatment-pyrolusite+sulfuric acid was studied.The effects of various factors on the leaching rate of tungsten and molybdenum were investigated.The results show that under the conditions of hydrochloric acid concentration of 1.5 mol/L,liquid volume to solid mass ratio of 6.5/1 and atmospheric pressure,the tungsten and molybdenum ores are pretreated with hydrochloric acid.Under the optimal conditions of filter slag of 20 g,particle size of 200 mesh,pyrolusite dosage of 4 g,sulfuric acid of 8 mol/L,liquid volume to solid mass ratio of 5/1,temperature of 90 ℃ and leaching time of 3 h,the leaching rates of molybdenum and tungsten are 83％and 73％,respectively.
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