The research on ammonia dissolving after thermal dissociation and direct ammonia dissolving shows that APT solid is thermally dissociated for 50 minutes at temperature of 280±5℃, and then 1:3 ammonia solution of 200 mL is added to dissolve for 6 hours at temperature of 95℃, leaching efficiency is 85.1%. Dissociation time has a little influence on S (Fe)/WO3. Leaching efficiencyof ammonia dissolving after thermal dissociation is higher than that of direct ammonia dissolving, but amounts of S ( Fe ) / WO3are basically similar.
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