Application of Waste Electrolyte to Recover Gold,Silver and Zinc from Wet Zinc Smelting Slag
A large amount of waste electrolysis is produced in the zinc electrolysis process.Waste electrolyte is acidic and contains many metal ions,such as direct discharge of serious pollution to the environment.Using waste electrolyte and concentrated sulfuric acid as leaching medium,the comprehensive recovery of gold,silver and zinc from wet zinc smelting slag by acid leaching and flotation process was studied.Taking the leaching slag(old slag)produced by conventional leaching process as the main object of study,the effects of pulp stirring speed,waste electrolyte dosage,sulfuric acid addition amount and acid leaching temperature on the flotation indexes of gold and silver were investigated.The results show that using the acid leaching and flotation process,the closed-circuit test of old slag finally obtains the concentrate with gold grade of 10.16 g/t,gold recovery of 78.63％,silver grade of 1 039.64 g/t,silver recovery of 74.72％,zinc grade of 40.64％,zinc recovery of 21.86％,the recovery of zinc in acid leaching solution is 60.15％.The validation test is carried out using the leaching slag(new slag)produced by hot acid leaching process and the fresh slag pulp produced by the leaching process,and a good closed-circuit test index is obtained.The method can realize the recycling of the waste electrolyte and make the valuable metals in the slag be recovered efficiently and comprehensively.
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