Blast furnace gas ash is one of the main solid wastes in iron and steel enterprise. The recovery of zinc from gas ash can result in considerable economic and environmental benefits. The effect of NH_3/NH_4~+, L/S, [NH_3]_T and leaching time on the zinc leaching rate of blast furnace gas ash by using ammonia leaching process had been investigated in this paper. The results show that L/S and NH_3/NH/ are the main influence factors under the experimental condition. The optimal conditions for leaching process are: NH_3/NH_4~+=2:1, L/S=4:l, [NH_3]t =5mol/L, and the leaching time is 3 hours. The zinc leaching rate is 82.84% under the optimized conditions. The lead content in leaching solution is high, so the main task is to improve the removal rate of lead in the purification process.
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