Method for treating sulfureous bauxite

Abstract

The invention discloses a method for treating sulfureous bauxite and relates to the technical field of sulfureous bauxite treatment process. The method includes the steps of grinding, desulfuration by reverse flotation and desilication by obverse flotation, and the step of removing H+, Fe3+ and Fe2+ in ore pulp is added before grinding, between grinding and desulfuration by reverse flotation, between desulfuration by reverse flotation and desilication by obverse flotation, or after desilication by obverse flotation. The ore pulp during flotation desilication can be dispersed sufficiently, index of flotation desilication is increased, and the problem of difficulty in alkaline flocculation of alkaline products of concentrates, tailings or red mud in bauxite beneficiation is solved.

Description

technical field [0001] The invention relates to the technical field of sulfur-containing bauxite processing technology. Background technique [0002] The total amount of sulfur-containing bauxite resources in my country exceeds 800 million tons, most of which are medium and low-grade bauxite, mainly concentrated in Guizhou, Chongqing and Henan. With the depletion of bauxite resources in our country, the development and utilization of sulfur-containing bauxite has become increasingly urgent. At present, the sulfur-containing bauxite with high aluminum-silicon ratio can be used for alumina production through desulfurization, while the bauxite with medium and low aluminum-silicon ratio can not be used for the economical Bayer process to produce alumina only by desulfurization, and must be carried out. Desiliconization improves the ratio of aluminum to silicon before it can be used in the production of alumina by the Bayer process. [0003] Sulfur-containing bauxite benefi...

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Problems solved by technology

[0006] 1. At present, the research on sulfur-containing bauxite beneficiation shows that the reverse flotation desulfurization technology is relatively mature, and the flotation desiliconization technology is more difficult, mainly because the pulp of flotation desilication is difficult to disperse, Na 2 CO 3 , NaOH, sodium hexametaphosphate and other regulators are doubled and cannot fully disperse the pulp, resulting in a large amount of flotation reagents, the aluminum-silicon ratio of the concentrate is not high, and the concentrate Al 2 o 3 Low recovery rate

Because the existing research failed to find the reason why the flotation desilication slurry is difficult to disperse, and failed to take better countermeasures, the flotation desilication became a difficult point in the beneficiation of sulfur-containing bauxite. Large-scale alumina plants only carry out flotation desulfurization of high-alumina-silicon ratio ores, but do not perform flotation desiliconization operations, resulting in a large amount of low-aluminum-silicon ratio sulfur-containing bauxite that has not been utilized

[0007] 2. In the bauxite beneficiation process, the concentrate and tailings and other beneficiation products are difficult to settle, and polymer flocculants such as polyacrylamide are often added to make a small amount of polymer flocculants exist in the tailings and concentrate water, and the beneficiation backwater When used, it is easy to cause flocculation of bauxite slurry, which deteriorates the beneficiation effect and makes it difficult to fully utilize the beneficiation backwater

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