Technology method used for producing poly aluminium chloride and calcium aluminate

Abstract

The invention discloses a technology method used for producing poly aluminium chloride and calcium aluminate. The technology method comprises following steps: 1, ash stir frying is carried out, and metal aluminum is recycled so as to obtain secondary aluminum ash; 2, the secondary aluminum ash is subjected to deamination processing so as to obtain a deaminated aluminum ash slurry; 3, the deaminated aluminum ash slurry is subjected to defluorination processing so as to obtain a defluorinated aluminum ash slurry; 4, the defluorinated aluminum ash slurry is filtered so as to obtain a filtrate anda filtration residue, wherein the filtrate is a poly aluminium chloride solution; and 5, the filtration residue is washed until the pH value is 7, is uniformly mixed with a calcium based auxiliary material, drying and high temperature reaction are carried out, after reaction, cooling, crushing, and grinding processing are carried out so as to obtain calcium aluminate. According to the technologymethod used for producing poly aluminium chloride and calcium aluminate, secondary aluminum ash is subjected to complete harmless processing, so that high efficiency resource utilization of secondaryaluminum ash is realized, and the produced products possess better economical benefit.

Description

technical field [0001] The invention specifically relates to a process for producing polyaluminum chloride and calcium aluminate by utilizing aluminum ash. Background technique [0002] Aluminum ash produced during aluminum electrolysis is an industrial waste with large output and serious pollution. The main source of aluminum ash: aluminum ash produced in the process of electrolytic production of alumina molten salt, aluminum ash in the process of aluminum electrolytic smelting, aluminum ash in the process of aluminum melting and casting, aluminum ash in the process of secondary aluminum processing, simultaneous operation and measurement A certain amount of aluminum ash will also be generated from the carrying of appliances, anode replacement, aluminum tapping, ingot casting, and overhaul of electrolytic cells. The newly released aluminum ash and aluminum slag contain a large amount of metallic aluminum, of which only part of the aluminum can be recycled, and the remaining...

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Problems solved by technology

[0004] However, this invention has disadvantages: on the one hand, the mixed salt obtained after solid-liquid separation has not been rationally utilized as a resource; Gases containing fluoride are produced in the

A new problem has arisen: this process method is incomplete in the harmless treatment of the secondary aluminum ash recycling, and the secondary pollution that may be caused in the process of producing the refining agent calcium aluminate has not been controlled, although the cost has been reduced However, it is not ideal in terms of the integrity of the process method and the harmless treatment of aluminum ash

[0006] However, this invention has disadvantages: on the one hand, the ammonia gas produced by the washed aluminum ash has not been utilized as a resource or the absorption and treatment of the gas; on the other hand, the filter residue after acid dissolution in the process contains fluorides. Hazardous waste, not effectively treated

A new problem arises: although the process is simple, easy to operate, and low in cost, the harmful gas and hazardous solid waste generated during the process have not been effectively treated. In the process of producing polyaluminum chloride, the The harmless treatment of aluminum ash is not complete, and the utilization of resources has not been achieved while harmless

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