Method for curing dry heaping damming of red mud and device for preparing mixed mud for dry heaping damming

Abstract

The invention discloses a method for curing dry heaping damming of red mud and a device for preparing mixed mud for dry heaping damming, and belongs to the technical field of solid waste disposal in aluminum oxide production. The method for curing dry heaping damming of the red mud comprises the steps that the red mud, power plant ash residues and a binding material are mixed and stirred to be uniform to form the mixed mud, and then the mixed mud is utilized for carrying out curing dry heaping damming and curing storage capacity filling, wherein the dry weight use proportion of the binding material to the power plant ash residues to the red mud in the mixed mud is (0.5-1):(3-5):(5-10), and the binding material comprises motivating ingredients and power plant ash residues. According to thetechnical scheme, the red mud and the ash residues can be comprehensively and effectively treated, damming expenses and ash residue transportation expenses can be saved, the early strength of an accumulation body entering a storage yard is large, and the influence of red mud and ash residue disposal on the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal in alumina production, and more specifically relates to a method for solidifying red mud to dry-stack a dam and a device for preparing mixed mud for dry-stacking a dam. Background technique [0002] After the bauxite is processed by alkali dissolution, the remaining red mud-like strong alkaline solid waste with high water content after producing alumina is called red mud. Its composition and output vary depending on ore grade, production method and technical level. varies. per 1t of Al produced 2 o 3 Discharge about 1-1.5t of red mud. Most foreign aluminum factories directly discharge red mud into the ocean for disposal. Domestic aluminum factories are generally located in inland provinces. Except that sintering red mud can be partially used as cement admixture, Bayer red mud and most sintering red mud All the mud needs to be sent to the red mud yard for storage. Among them, the ...

AI Technical Summary

Problems solved by technology

The traditional disposal process of red mud and ash usually has the following disadvantages: the red mud and ash are stored separately, and the investment is relatively large; the wet storage process needs to be dammed with earth and rock or sintered red mud, which has advantages in the selection of dam materials. Limitation; in the dry storage process, the ash is transported by car, and the transportation cost is high

[0005] For example, the application with the patent publication number CN101845818B discloses a method and device for building a dam by mixing red mud and ash. In this application, the red mud and ash are mixed and dewatered by pressure filtration to obtain semi-dry red mud ash. The slag mixture filter cake, using the obtained filter press product for dam construction, can save dam construction costs and ash transportation costs, and ensure that less water enters the storage yard, reducing the impact of red mud and ash disposal on the environment, but The filter press dehydration process is an intermittent operation, and the dehydration efficiency is low

In addition, the reaction between ash and red mud is slow, and the early deposits are still in danger of muddying and collapsing after encountering heavy rainfall, and the alkali in it has not been recovered and will still spread, which will affect the surrounding environment of the red mud reservoir

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