A multi-stage countercurrent rinsing device and method for zinc oxide fumes rich in chlorine and fluorine

Abstract

The invention discloses a multistage countercurrent rinsing device and method of zinc oxide smoke rich in chlorine and fluorine. The device is characterized by comprising multiple rinsing pools arranged side by side, multiple press filters arranged above the rinsing pools in a staggered manner, and connecting pipes, wherein a pulp outlet is arranged at one side of the bottom end of each rinsing pool; a material inlet and a filtrate inlet are arranged at the top of each rinsing pool; the multiple press filters are each provided with a pulp inlet, a filtrate outlet and a slag outlet; the pulp outlets of the multiple rinsing pools correspondingly communicate with the pulp inlets of the multiple press filters through ore pulp pumps and pulp pipelines; the filtrate outlets of the multiple press filters communicate with the filtrate inlets of the multiple rinsing pools through guide main pipes; and the slag outlets of the multiple press filters are in staggered communication with the material inlets of the multiple rinsing pools. The device realizes reverse circulation of solid and liquid materials, can deeply remove water soluble compounds in the solid materials, solves the removal problem of water soluble chlorine fluorine compounds in oxide zinc smoke raw materials in wet zinc smelting, and facilitates linking with other procedures.

Description

technical field [0001] The invention belongs to the field of metal smelting, and relates to a rinsing device for removing chlorine and fluorine in zinc oxide dust, in particular to a multistage countercurrent rinsing device and method for zinc oxide dust rich in chlorine and fluorine. Background technique [0002] Industrial zinc oxide dust is a kind of hazardous solid waste, and it is a secondary renewable resource of various valuable metals such as zinc, cadmium, lead, tin, etc. However, due to the high content of chlorine and fluorine in zinc oxide dust, the cost of electrolytic production is correspondingly high. Therefore, before electrolysis, it is necessary to perform fluorine removal and chlorine purification treatment to meet the requirements of electrolysis. [0003] At present, there are many methods and equipments for removing chlorine and fluorine. The industrially used methods are multi-hearth furnace roasting, rotary kiln roasting, microwave roasting, lye rin...

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Problems solved by technology

[0003] At present, there are many methods and equipments for removing chlorine and fluorine. The industrially used methods are multi-hearth furnace roasting, rotary kiln roasting, microwave roasting, lye rinsing, concentrated sulfuric acid method, etc. These methods are aimed at zinc oxide rich in chlorine. The method of dechlorination and fluorine removal of smoke and dust, such methods and equipment, high energy consumption, high equipment investment and operating costs

[0004] And the above method is used only when the chlorine content in the zinc oxide dust is not more than 2%, it can match with the traditional zinc hydrometallurgy process, but the adaptability to zinc oxide dust from a wide range of sources is relatively poor, especially Zinc oxide dust formed after pyroprocessing of secondary resources, which is rich in 2%-25% of chlorine and more than 1% of fluorine

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