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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