Method for removing fluorine from zinc sulfate solution with active alumina

Abstract

The invention relates to a method for removing fluorine from a zinc sulfate solution with active alumina. The method comprises the following steps: A, removing fluorine through adsorption: adding active alumina to the zinc sulfate solution, removing most fluorine through adsorption to the content of fluorine in the solution of less than 0.1 g / L, filtering, allowing the low fluorine zinc sulfate solution to enter into a zinc hydrometallurgy process, and allowing a filter residue to enter into a washing process; B, washing: adding water to the filter residue obtained in step A, washing, filtering, allowing a filtrate to enter into a zinc precipitation process, and allowing a filter residue to enter into a regeneration process; C, regenerating: adding water and caustic soda to the filter residue obtained in step B, regenerating, filtering, allowing a filtrate to enter into a waste water processing process, allowing a filter residue to enter into an adsorption fluorine removal process to obtain active alumina for removing fluorine from a next zinc sulfate solution; D, precipitating zinc: adding a zinc precipitant into the filtrate obtained in the step B, precipitating zinc, filtering,allowing a filtrate to enter into the waste water processing process, and allowing a filter residue to enter into the zinc hydrometallurgy process; and E, processing waste water: adding sulfuric acidand a water processing agent into the filtrates obtained in step C and step D, and discharging when standards are reached. The method has the characteristics of simplicity and easy operation, low cost, environmental protection, good fluorine removal effect, remarkable economic benefit and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy in nonferrous metallurgy, and in particular relates to a method for removing fluorine from zinc sulfate solution by using activated alumina, which is especially suitable for treating high-fluorine zinc sulfate in the process of producing electrolytic zinc from high-fluorine zinc-containing raw materials The solution was defluorinated. Background technique [0002] my country is one of the most important producers of zinc metal in the world, and the growth rate of production capacity far exceeds the world average level. my country's metal zinc is basically produced by hydrometallurgy process. This is because hydrometallurgy zinc It has the characteristics of environmental protection, low cost and high recovery rate. However, in the hydrometallurgy process, the fluorine content in the electrolytic solution needs to be strictly controlled, if the fluorine content is too high (F - >0.1 g / L), the cat...

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Problems solved by technology

[0004] To sum up, at present, my country's metal smelting industry is deeply troubled by excessive fluoride ions in the hydrometallurgy of zinc, and lacks a good solution. It is urgent to independently develop a technical operation that is less difficult to operate, economically feasible, practical and effective. Targeted method for removing fluorine in zinc sulfate solution

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