Method for building dam through red mud curing and dry heaping and preparing device of mixed slurry for dam building through dry heaping

Abstract

The invention discloses a method for building a dam through red mud curing and dry heaping and a preparing device of mixed slurry for dam building through dry heaping, and belongs to the technical field of solid waste disposal in the aluminium oxide production process. According to the method for building the dam through red mud curing and dry heaping, red mud, power plant slag and a binding material are mixed and stirred evenly to form mixed slurry, the mixed slurry is dam building through curing and dry heaping and curing for storage capacity filling are achieved through the mixed slurry, according to the dry weight use proportion in the three components in the mixed slurry, the binding material: the power plant slag: red mud is 0.5-1:3-5:5-10, and the binding material comprises a stimulation component and the power plant slag. According to the technical scheme, the red mud and the slag can be comprehensively and effectively treated, dam building cost and slag transport cost can be saved, meanwhile, the early strength of a stacking body entering a storage yard is higher, and the influence of red mud and slag treatment on the environment can be 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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