Storage-yard damming method of red mud by mixed self-solidifying dry process

Abstract

The invention discloses a storage-yard damming method of red mud by a mixed self-solidifying dry process. The storage-yard damming method comprises the following steps of: (1) counted by the dry weight of red mud slurry, uniformly mixing the sintering-process red mud slurry and the Bayer-process red mud slurry according to the proportion of 1-2:8-9, and obtaining mixed red mud slurry; (2) dewatering the mixed red mud slurry and obtaining a mixed red mud filter cake; (3) conveying the mixed red mud filter cake to a red mud storage yard, distributing, laying and carrying out overturning drying; and (4) rolling the overturning-dried red mud, forming a red mud dam body and finishing the damming of the red mud storage yard. In the method, the amount of the needed sintering-process red mud is only 10%-20% of the total amount of the mixed red mud, and the effect of the existing mixed semidry-process damming method, namely the amount of the needed sintering-process red mud accounts for 40-60% of the total amount of the mixed red mud, can be achieved. The method not only reduces the amount of the needed sintering-process red mud for the storage-yard damming of the red mud greatly, but also has the advantages of high damming speed, low investment, small needed place, high recovery rate of alkali in attached liquid of the red mud and the like.

Description

technical field [0001] The invention relates to a red mud stockpile dam building method, in particular to a sintering method red mud and Bayer process red mud mixed self-condensing drying method stockpile dam building method, which belongs to the field of red mud stockpiling. Background technique [0002] Red mud is a reddish-brown powder muddy, high water content, strong alkaline solid waste left after bauxite has undergone various physical and chemical treatments to produce alumina. According to different alumina production methods, red mud is generally divided into sintering red mud and Bayer red mud, and its output varies with ore grade, production method, and technical level. In the alumina production process, 1.0-1.8 tons of red mud is produced for every ton of alumina produced. The domestic alumina production methods in China mainly include: combined method (sintering method and Bayer method connected in parallel or in series), sintering method, and Bayer method. Am...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects of the existing sintering red mud and Bayer red mud mixed dam construction methods that require a higher blending ratio of sintering red mud, and provide a new sintering red mud , Bayer red mud mixed dam construction method, the blending ratio of sintered red mud required by this method is relatively low, and the cost is low, which can meet the requirements of red mud stockyard dam construction