A method for simultaneous resource utilization of iron, sodium and aluminum from red mud

Abstract

The invention discloses a method for simultaneous resource utilization of iron, sodium and aluminum from red mud. According to the method, the red mud is subjected to filtering, drying and grinding treatment, after grinding, sieving is carried out, red mud powder is obtained, the red mud powder and water are mixed to be uniform in a red mud pre-immersion trough according to the solid-liquid mass ratio of 1: (30-50), and red mud paste is obtained; FeSO4 and / or Fe2(SO4)3 and the red mud paste are mixed according to the solid-liquid mass ratio of 1: (20-30), air is fed, and aeration is carried out so that the mixture can sufficiently react; pulp obtained after the reaction is subjected to solid-liquid separation, a solid phase bottom residue part is sold or serves as a solid matrix, a liquidphase part reacts with CaO, the CaO and the liquid phase are mixed according to the solid-liquid mass ratio of 1: (10-15) and then react, a product obtained after the reaction is subjected to solid-liquid separation, obtained solid-phase bottom residue and the bottom residue obtained in a replacement process are treated together, and the liquid phase part is recovered and is mainly used in an aluminum oxide production process. By means of the method, resource utilization and large-scale factory comprehensive utilization of the iron, the sodium and the aluminum in the red mud can be effectivelyachieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of tailings resources, and in particular relates to a method for resource utilization of iron, sodium and aluminum simultaneously from red mud. Background technique [0002] Red mud is industrial solid waste discharged from bauxite after refining alumina. my country's annual alumina output exceeds 1 million tons. Generally, 1.0-2.0 tons of red mud will be produced for every 1 ton of alumina produced. At present, red mud is mainly disposed of by stockpiling and covering soil. The stockpiling of red mud not only requires maintenance, but also occupies land, pollutes the environment, and poses safety hazards. [0003] The content of metal oxides in red mud is rich, especially the content of iron is high. It also has the characteristics of porous materials such as good particle dispersion and large specific surface area, and it has good stability in solution. These characteristics ma...

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Problems solved by technology

[0005] In the prior art, the Chinese patent application with application number CN 104818381 A discloses a method for recovering iron from Bayer process red mud. In this method, red mud powder is mixed with carbon powder and roasted, and the roasted products are sequentially water-quenched , Natural sedimentation and centrifugal treatment to obtain precipitation, mix the obtained sediment with deionized water evenly to obtain ore pulp, conduct magnetic separation with a magnetic separator to obtain magnetic separation, filter and dry the magnetic separation pulp in turn, The iron concentrate is obtained, but after being treated by this method, only the iron in the red mud is used as a resource; the Chinese patent application with application number CN 102851425 B discloses a high-efficiency separation and comprehensive utilization of iron, aluminum and sodium in high-iron red mud The method uses high-iron red mud as raw material, adds iron concentrate and coke powder, presses red mud pellets, and uses a rotary hearth furnace to directly reduce metal oxides such as iron and sodium after drying and preheating. The chemical pellets are sent to the iron bath type oxygen-coal smelting reduction high-temperature melting separation, but this method needs to consume iron ore concentrate, etc., the cost is high, and high-temperature melting separation is required, the energy consumption is high and the equipment quality requirements are high.

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