Method for recovering metal resource from zinc calcine through reduction roasting-leaching-zinc sinking

Abstract

The invention discloses a method for recovering a metal resource from zinc calcine through reduction roasting-leaching-zinc sinking. High-iron zinc calcine containing zinc ferrite is reduced and roasted under the CO atmosphere, so that the zinc ferrite is decomposed to zinc oxide and iron oxide; the alkaline leaching is performed for the roasting product by sodium hydroxide solution to obtain sodium zincate solution containing few impurity ions; and iron, lead and silver enter the leaching slag for enriching and recovering to realize high-efficiency separation of zinc and iron. The neutralization, the adjustment and the zinc sinking are performed for the leaching liquid by waste electrolyte in conventional zinc wet smelting; the leaching liquid is calcined by a muffle after the precipitation; and the zinc resource is recovered in a form of active zinc oxide. The method prevents the complicated iron sinking flow in the conventional zinc wet smelting procedure, is excellent in zinc-iron separation effect, and achieves the purpose of comprehensively recovering the metal resource.

Description

technical field [0001] The invention belongs to the intersecting field of metallurgical engineering and environmental engineering, and mainly relates to a method for efficiently separating zinc and iron from a traditional zinc hydrosmelting process and recovering valuable metal resources. Background technique [0002] my country is a big country in zinc smelting, and its zinc output has always been among the top in the world. At present, more than 85% of zinc is produced by traditional roasting-leaching-purification-electrowinning wet process. Zinc ore is often associated with 8-15% Fe. During the oxidation roasting process of hydrometallurgy, this part of Fe inevitably reacts with zinc oxide in zinc calcine to form zinc ferrite with stable properties. Zinc ferrite is difficult to dissolve in conventional neutral leaching and acid leaching, resulting in a low recovery rate of zinc, and a large amount of leaching slag containing lead and silver is piled up, causing environmen...

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Problems solved by technology

The process has high energy consumption, high labor operation intensity, low recovery rate of zinc, and serious environmental pollution.

The generated rotary kiln slag is mainly a solid solution of carbon, iron, lead, silver and scattered metals, which is hard, difficult to grind, difficult to follow-up treatment, and a large amount of accumulation pollutes the environment

The wet treatment process is mainly high temperature and high acid leaching-iron precipitation process. Zinc ferrite is forcibly dissolved under high temperature and high acid conditions. The sinking iron process is complicated, the production cost is high, and the requirements for equipment are high. A large amount of sinking iron slag is also a waste of resources and pollutes the environment.

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