Series alumina production process

A production process and method of alumina technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, inorganic chemistry, aluminum compounds, etc., and can solve the problem of narrow sintering temperature range, strict equipment requirements, and low added value of products and other problems, to achieve the effect of high dissolution rate, lower overall cost, lower infrastructure investment and maintenance costs

Inactive Publication Date: 2019-09-10
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 n

Method used

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  • Series alumina production process

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Embodiment 1

[0034] Such as figure 1 As shown, the present embodiment tandem alumina production process is carried out according to the following steps:

[0035] (1) Mix part of the mother liquor decomposed by the Bayer process with red mud evenly, and add fine iron ore, caustic soda and lime to make a slurry to be dissolved. The amount of decomposed mother liquor is based on the mass ratio of liquid to solid in the slurry to be dissolved is 3.5, and the amount of iron ore added is based on the amount of Fe in the iron ore. 2 o 3 Al in red mud 2 o 3 The mol ratio is 0.4; the addition of caustic soda is 20 according to αk in the slurry to be dissolved, and the Nk is 260g / l; the addition of lime is based on the 0.5 ton of active lime added per ton of dry red mud, and the slurry to be dissolved is Reaction at 230°C for 1.0h.

[0036] (2) The material after dissolution is separated from solid and liquid to obtain secondary red mud and dissolution separation liquid; the secondary red mud i...

Embodiment 2

[0040] Such as figure 1 As shown, the present embodiment tandem alumina production process is carried out according to the following steps:

[0041] (1) Mix part of the mother liquor decomposed by the Bayer process with high-iron red mud evenly, and add caustic soda and lime to make a slurry to be dissolved. The amount of decomposed mother liquor is calculated according to the mass ratio of liquid to solid in the slurry to be dissolved is 4.0; the amount of caustic soda is calculated according to the αk in the slurry to be dissolved is 25, and the Nk is 280g / l; the amount of lime added is calculated as per ton of dry red mud 0.4 tons of active lime; react the slurry to be dissolved at 245°C for 0.5h.

[0042] (2) The material after dissolution is separated from solid and liquid to obtain secondary red mud and dissolution separation liquid; the secondary red mud is washed with hot water at 95°C to obtain by-product secondary red mud filter cake and secondary red mud washing li...

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Abstract

The invention belongs to the technical field of mineral processing, and particularly relates to a series alumina production process. The process is carried out according to the following steps: (1) uniformly mixing part of a Bayer method decomposition mother liquor with a red mud, adding an iron source, caustic soda and lime to prepare a slurry liquid to be dissolved out; (2) performing solid-liquid separation on a slurry liquid after dissolving out to obtain a solid secondary red mud and a dissolved out separation liquid; washing the solid secondary red mud with hot water to obtain a byproduct secondary red mud filter cake and a secondary red mud washing liquid; and mixing and then sending the dissolved out separation liquid and the secondary red mud washing liquid to a circulating motherliquor preparing procedure in a Bayer method process, performing mixing with the remaining Bayer method decomposition mother liquor after evaporation, and then entering a dissolving out and dilutionprocedure as a circulating mother liquor; and (3) mixing the circulating mother liquor with a bauxite, and then producing qualified alumina through conventional Bayer method procedures. According to the process, high-alkali dissolving out of a Bayer method red mud is carried out, an extraction rate of alumina is improved, consumption of an alkali is reduced, and thus waste-free discharge and comprehensive utilization of alumina production are realized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a tandem alumina production process. 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 various processes such as Bayer method, sintering method and Bayer sintering combined method. 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). 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. [0003] The Bayer sintering combined method is applied in some cases, which can get better economic results than the Bayer method or sintering method alone, so that the bauxite resources can be more fully...

Claims

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Application Information

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IPC IPC(8): C01F7/06C01F7/14
CPCC01F7/06C01F7/0693C01F7/14
Inventor 赵成明李志国孙津
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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