Research on Ammonia Leaching Process of Roasted Sand after Oxidative Roasting-Acid Leaching Pretreatment of Molybdenum Concentrate
After the oxidation roasting acid washing treatment of molybdenum concentrate,the impurity elements in the roasted sand are reduced,and molybdenum is significantly enriched.For the roasted sand after impurity removal,ammonia water is used for leaching to study the influencing factors of molybdenum leaching during the ammonia leaching process.The results show that under the optimal conditions for ammonia leaching of roasted sand,the temperature is 60℃,the ammonia leaching time is 30 min,the liquid-solid ratio is 3.5～4.0,and the pH is 8.5～9.0.The ammonia leaching rate of roasted sand can exceed 98.6%,the ammonia leaching residue rate is about 16%,and the molybdenum content in the ammonia leaching residue is about 3.5%.The residual molybdenum in the ammonia leaching residue is mainly MoS2 that has not been oxidized during the roasting process,while the rest is mainly gangue,and the true specific gravity of the ammonia leaching residue is 2.85 g/cm3.The molybdenum content of ammonia leaching solution is 140～150 g/L,and it also contains a small amount of Fe and Cu,and the specific gravity of ammonia leaching solution is 1.15～1.18 g/cm3.
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