Method of purifying electrolytic aluminium flue gas and recycling aluminum resources by means of aluminum ash of electrolytic aluminum

Abstract

The invention discloses a method of purifying electrolytic aluminium flue gas and recycling aluminum resources by means of aluminum ash of electrolytic aluminum; in the method, the industrial solid waste, aluminum ash, generated during the aluminum electrolysis process is mixed with manganese sulfate and process water to prepare desulfurization slurry which is then applied to flue gas desulfurization and defluorination coupling of the aluminum electrolysis and aluminum resource recovery, so that not only the aluminum ash is utilized but also flue gas desulfurization and defluorination and aluminum resource recovery are achieved, thus achieving the object of treating wastes with wastes. The technical process of the method includes steps of: preparing the desulfurization slurry, purifying the flue gas, performing acid-leaching oxidization to the desulfurization slurry, cycling the desulfurization slurry, electrolytically separating the desulfurization slurry, and recovering the desulfurization slurry. The method employs simple equipment, is low in investment, is short in process route, and is low in operation cost. The method not only significantly reduce the flue gas desulfurizationcost of industrial aluminum electrolysis, reduces the environment protection load of the aluminum electrolysis industry, effectively recovers the aluminum resources and produces aluminum sulfate, aluminum fluoride and alloy concentrated ore, reduces economic pressure of the aluminum electrolysis industry, and has extensive application prospect.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment in the electrolytic aluminum production process, in particular to a method for purifying electrolytic aluminum flue gas and recovering aluminum resources by using electrolytic aluminum ash. Background technique [0002] The electrolytic aluminum industry is an important basic raw material industry for the development of my country's national economy. The production capacity of electrolytic aluminum industrial enterprises in my country is concentrated. At the end of 2016, the output of electrolytic aluminum in my country reached 35.6 million tons, accounting for about 56% of the global total. The electrolytic aluminum flue gas produced by the electrolytic aluminum industry has the characteristics of large flue gas volume and relatively low sulfur concentration. The amount of flue gas produced by every ton of aluminum produced in my country is about 90,000 to 140,000 m 3 , where SO 2...

AI Technical Summary

Problems solved by technology

However, this method does not recover much alumina

Patent CN201510370094.6 discloses a method for efficiently separating and recovering metallic aluminum from aluminum ash. The aluminum ash is pretreated by adding acid, and then a flux is added to dissolve and recover metallic aluminum in a rotary kiln. The recycling rate of electrolytic aluminum and aluminum ash is not high and SO in electrolytic aluminum flue gas 2 Low concentration, large smoke volume

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