Bayer process red mud processing method

Abstract

The invention discloses a treatment method of Bayer method red mud, comprising the following steps: (a) the red mud is sorted by a beneficiation method and divided into three parts, namely, rough sand, fine sand and soil mortar; (b) milling grinding and settling separation are carried out to the rough sand in the step (a) to obtain rough sand one and tailing ore slurry one; (c) after the rough sand one in the step (b) and the fine sand in the step (a) are mixed, magnetic separation is carried out to obtain iron powder and quartz powder; (d) the iron powder obtained in the step (c) is refined and sorted by a magnetic separator to obtain fine iron powder F and fine iron powder P; and (e) the soil mortar in step (a) is pulse magnetic separated to obtain tailing ore slurry and fine iron powder PI. The method can reduce 35-40 percent of red mud discharge, the iron element effective utilization rate can reach more than 70 percent, and the monomer quartz extraction yield can reach 80 percent. The method optimizes the production flow of alumina by using a combination method, reduces the red mud discharge, protects the environment, reduces the production cost of alumina and improves the alumina production capacity.

Description

technical field [0001] The invention relates to a treatment method of red mud in alumina production, in particular to a treatment method of Bayer process red mud. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. With the continuous development of the bauxite industry, the discharge of red mud in my country is more than 15 million tons per year, and with the new production and the increase and transformation of old equipment, the total amount of red mud has an upward trend. Most alumina plants in the world pile up or pour red mud into the deep sea. The storage of red mud not only takes up a lot of land and farmland, but also costs more yard construction and maintenance costs, and the remaining lye in the red mud will Seep into the ground, causing groundwater pollution. In addition, the dust formed by the red mud in the storage yard is flying everywhere, damaging the ecological environ...

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Problems solved by technology

[0004] The former Soviet Union, Japan, the United States, Germany, etc. have done a lot of research on the recovery of metallic iron in red mud. Although the time of foreign research is relatively early, mostly in the 1960s and 1980s, there is still no large amount of actual research. application