Sintering process of separating red mud for alumina production

Abstract

The red mud separating process includes cyclonic grading the chamotte lixiviating slurry from the chamotte lixiviating step in a swirler while controlling the feeding pressure in 0.245-0.255 MPa, exhausting the slurry with coarse grains and high solid content via the bottom exhaust port to bottom groove, filtering the slurry with fine grains and low solid content in a bag filter to separate red mud from solution, flushing the filter slag to bottom groove, and returning the filtrate to the coarse liquid groove. The present invention has reasonable separation process, short and stable red mud separating period, high alumina and sodium oxide lixiviating rate and other advantages.

Description

Technical field: [0001] The invention relates to a separation method of sintering red mud produced by alumina. technical background: [0002] At present, flocculant sedimentation separation technology is generally used in the production of alumina red mud by sintering at home and abroad. Although this process is simple to operate, it has strict requirements on the quality of clinker, the concentration of alumina in the eluate, the concentration of alkali, and the degree of grinding. The separation effect is unstable and fluctuates with the clinker quality, the concentration of alumina in the eluate, and the concentration of alkali. At the same time, this process has the fatal defect of long contact time between the eluate and red mud (15 minutes), and the secondary reaction loss is large, resulting in low dissolution rates of alumina and sodium oxide, which are about 85% and 92% respectively. The recoveries of alumina and sodium oxide were obtained. In addition, after sedi...

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Problems solved by technology

[0002] At present, flocculant sedimentation separation technology is generally used in the production of alumina red mud by sintering at home and abroad. Although this process is simple to operate, it has strict requirements on the quality of clinker, the concentration of alumina in the eluate, the concentration of alkali, and the degree of grinding. The separation effect is unstable and fluctuates with the clinker quality, the concentration of alumina in the eluate, and the concentration of alkali

At the same time, this process has the fatal defect of long contact time between the eluate and red mud (15 minutes), and the secondary reaction loss is large, resulting in low dissolution rates of alumina and sodium oxide, which are about 85% and 92% respectively. The recoveries of alumina and sodium oxide

In addition, after sedimentation and separation, the floating solids (impurity content) in the overflow can only reach 5g / l

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