Red mud treatment and aluminum oxide production method

Abstract

The invention discloses a red mud treatment and aluminum oxide production method. The red mud treatment method includes the steps: uniformly mixing part of mother liquor decompose by a Bayer method and red mud, adding corresponding matching iron sources, caustic soda flakes and lime, leaching mixture to form leaching materials, performing solid-liquid separation to obtain solid andradite and leaching separation liquid, washing and drying the solid andradite to obtain finished product andradite, mixing the leaching separation liquid and andradite washing liquid, and conveying mixture into a mother liquor circulating and matching process in a Bayer method procedure to complete red mud treatment; mixing the leaching separation liquid and andradite washing liquid, and conveying mixture into the mother liquor circulating and matching process in the Bayer method procedure to mix with retained mother liquor decompose by the Bayer method to serve as circulating mother liquor to enter a leaching and diluting process; mixing the circulating mother liquor and monohydrallite to generate aluminum oxide. The method is simple and easy to implement and effectively avoids the problems of difficultcontrol of red mud treatment, high energy consumption and the like in the prior art, construction investment and maintenance cost are greatly reduced, the leaching rate of aluminum oxide and sodium oxide in red mud is high, and comprehensive utilization values of the monohydrallite are improved.

Description

Technical field: [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for red mud treatment and alumina production. Background technique: [0002] The alumina production method widely used in industry is the alkali method, and the production of alumina by the alkali method is subdivided into Bayer method, sintering method and Bayer-sintering combined method and other processes. [0003] The Bayer method has simple process, low energy consumption, good product quality and low cost, but it is more suitable for processing bauxite with higher grade (A / S>5). [0004] The sintering method is suitable for processing low-grade bauxite, but the process is more complicated, and the energy consumption and cost are higher than those of the Bayer method. [0005] Bayer-sintering joint method is applied in some cases, which can get better economic results than Bayer method or sintering method alone, so that bauxite resources ...

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Problems solved by technology

However, in the current mature red mud utilization technology, the method of using red mud as a general basic raw material as a whole has low added value of the product; the sintering method has many problems such as narrow sintering temperature range, difficult control, high energy consumption, and poor economy. Problem: The process of acid treatment of red mud has strict requirements on equipment and is difficult to industrialize

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