A method and device for recovering zinc by leaching blast furnace gas ash by multi-ligand complex coordination ammonia method

Abstract

The invention relates to a method for leaching and recovering zinc from blast furnace dust by a multi-ligand composite coordination ammonia process and a device thereof belong to the technical field of hydrometallurgy. The method provided by the invention comprises the following steps: firstly uniformly mixing a coordination agent selected from citric acid or citrate and a coordination agent selected from tartaric acid or tartrate so as to obtain a coordination mixture; and adding the coordination mixture into pure water, uniformly stirring, successively adding an ammonia-water solution and ammonium sulfate, uniformly mixing to form a coordination leaching agent, controlling the total ammonia concentration of the coordination leaching agent to 0-10 mol / L, leaching under a relatively sealing condition by successively adding blast furnace dust and the coordination leaching agent according to the solid-to-liquid ratio of 1:1-10g / ml into a reaction vessel so as to obtain a zinc leachate. During the leaching process, reaction temperature is controlled to 25-80 DEG C, stirring speed is 100r / min-600r / min, and leaching time is 1.5h-3h. According to the method, zinc is leached out of ferrous metallurgy zinc-containing blast furnace dust by a multi-ligand composite coordination ammonia process, but other impurities are nonsoluble.

Description

technical field [0001] The invention relates to a method and a device for recovering zinc from blast furnace gas ash by a multi-ligand compound coordination ammonia method and belongs to the technical field of hydrometallurgy. Background technique [0002] In addition to zinc mineral resources, zinc-containing slag dust and other metallurgical slag dust are also extremely important available resources in my country, mainly zinc-containing gas mud and gas ash produced in the blast furnace smelting process, zinc-containing smoke dust produced in the electric arc furnace smelting process, and lead smelting. Zinc-containing fume and zinc hydrometallurgy slag after slag volatilization. my country is the world's largest steel producer, with an annual output of more than 500 million tons of steel. According to statistics, every ton of steel produced produces 10-15kg of zinc-containing blast furnace gas mud, and the annual by-product of gas ash is about 5-7 million tons, containing ...

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Problems solved by technology

[0007] The above-mentioned traditional treatment methods all belong to the fire method for recovering zinc, and the calorific value of the furnace charge is required to be high. At present, most domestic enterprises have a calorific value of more than 2,000 kcal / kg for the furnace charge, and the operation rate is low. The service life of the kiln lining is short and the comprehensive energy consumption High, small processing capacity, large investment, high coke consumption rate, high energy consumption such as tailings containing zinc and high carbon, especially for the disposal and utilization of low-grade materials, the economic feasibility is poor

In addition, a long rotary kiln is used to process mixed pellets or dust. If the zinc in the dust is to be directly recovered, a second-stage rotary kiln is required. The zinc-containing steam enters the second rotary kiln for reprocessing. The equipment is huge, the efficiency is low, and it is easy to produce Loop phenomenon

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