Process for producing high-alumina cement by utilizing aluminum ash and fly ash generated after waste incineration

Abstract

The invention discloses a process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration. The process comprises the following steps of: mixing and homogenizing the aluminum ash and the fly ash generated after waste incineration according to the weight ratio of (6-7): (3-4); heating the material to 1400-1700 DEG C by a high-temperature smelting furnace; heating and preserving heat for 2-3 hours; and performing cooling, and then performing crushing and grinding to obtain the high-alumina cement. According to the process, the aluminum ash and the fly ash obtained after waste incineration are mixed, homogenized and fused at high temperature, the high-alumina cement with calcium aluminate and calcium aluminosilicate as main components is prepared, and the high-alumina cement can reach the CA-60 cement grade. After a large amount of heavy metal salts in the fly ash are molten, the leaching rate is very low after the heavy metal salts are stably solidified, dioxin can be degraded and harmlessly treated at about 1400 DEG C; and after treatment, toxic leaching meets the environmental protection requirement and national standard. After chlorate in the aluminum ash is volatilized at the high temperature of 1400-1700 DEG C, calcium chloride is collected through a flue gas pipeline rapid cooling dust collection bag, and a harmless calcium chloride byproduct is formed.

Description

Technical field: [0001] The invention relates to a production process of high-alumina cement, in particular to a process for producing high-alumina cement by utilizing aluminum ash and fly ash produced after garbage incineration. Background technique: [0002] Aluminum ash is a kind of dross floating on the aluminum liquid in the electrolytic tank produced during the aluminum electrolysis process. Aluminum ash is mainly divided into primary aluminum ash (white ash) and secondary aluminum ash (black ash). Primary aluminum ash is the aluminum slag produced in the process of producing aluminum from primary aluminum. Its main components are metallic aluminum and aluminum oxide, and the metallic aluminum content can reach 30-70%. Secondary aluminum ash is the residue of primary aluminum ash or other waste miscellaneous aluminum after using physical or chemical methods to extract metal aluminum. The metal aluminum content is low and the composition is relatively complex. It mainl...

AI Technical Summary

Problems solved by technology

[0004] Since the fly ash produced after waste incineration has the above characteristics, it cannot be directly landfilled, but needs to be stabilized. At present, there are two main ways to stabilize fly ash produced after waste incineration. One is to combine fly ash with Cement, chelating agent, water and other related substances are mixed to stabilize the fly ash (that is, no harmful substances will be revealed) and then landfilled. This method is low in cost and saves land; the second is to modify the fly ash , to produce building materials, this method saves land, but the production cost is high, and the standard of the produced building materials is low, which can only be used as low-standard materials for road construction, etc.