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Method for removing gallium from low-gallium Bayer process mother liquor

A technology with Bayer method and low concentration, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, purification of aluminate/alumina/aluminum hydroxide, etc., which can solve the problem that the purity of alumina cannot meet the requirements of high-purity production The requirements of aluminum, the difficulty of removing other metal impurities, and the large energy consumption of the evaporation and concentration process have achieved the effects of avoiding high liquid viscosity, reducing the dissolution rate, and preventing resin poisoning

Pending Publication Date: 2019-01-11
中铝山东有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallization method used in industry is to precipitate the vanadium salt by evaporating and concentrating the solution to a certain concentration and then cooling down. However, the evaporation and concentration process consumes a lot of energy. Although the vanadium salt can be removed, it often increases the concentration of other metal impurities, and the concentrated solution The high viscosity makes it more difficult to remove other metal impurities in the follow-up, and the purity of the obtained alumina is not high. The conventional cooling process usually uses cooling water or multiple heat exchanges to achieve cooling, but because the conventional vanadium removal process does not reduce the vanadium removal process In connection with the subsequent gallium removal adsorption process, the cooling standard is usually based on reaching the maximum precipitation temperature of vanadium salt, and the cooling process is not strictly controlled.
The purity of alumina produced by the Bayer process in the market cannot meet the requirements for the production of high-purity aluminum
At present, the market mainly uses ordinary metal aluminum as raw material to produce high-purity aluminum through purification, and there is no special alumina for high-purity aluminum

Method used

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  • Method for removing gallium from low-gallium Bayer process mother liquor
  • Method for removing gallium from low-gallium Bayer process mother liquor

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Effect test

Embodiment 1

[0028] This embodiment provides a method for removing gallium from the Bayer process mother liquor with low gallium concentration, and its process flow chart is as attached figure 1 As shown, the process steps include:

[0029] 1) Use the low-temperature Bayer process to dissolve bauxite to reduce the dissolution rate of metal gallium in the ore. The dissolution temperature is 140°C, and then use concentrated sodium hydroxide solution to convert aluminum hydroxide into sodium aluminate. By diluting and adding The aluminum hydroxide seeds cause the aluminum hydroxide to re-precipitate, and the solution after the aluminum hydroxide is collected is the alumina mother liquor, and the temperature of the alumina mother liquor is lower than 70°C.

[0030] 2) Cooling and impurity removal: The alumina mother liquor obtained in step (1) is subjected to cooling treatment. The initial temperature of the alumina mother liquor is 68° C., and the temperature of the alumina mother liquor afte...

Embodiment 2

[0035] This embodiment provides a method for removing gallium from the Bayer process mother liquor with low gallium concentration, and its process flow chart is as attached figure 1 As shown, the process steps include:

[0036] 1) Use the low-temperature Bayer process to dissolve bauxite to reduce the dissolution rate of metal gallium in the ore. The dissolution temperature is 130°C, and then use concentrated sodium hydroxide solution to convert aluminum hydroxide into sodium aluminate. By diluting and adding The aluminum hydroxide seeds cause the aluminum hydroxide to re-precipitate, and the solution after the aluminum hydroxide is collected is the alumina mother liquor, and the temperature of the alumina mother liquor is lower than 70°C.

[0037] 2) Cooling and removing impurities: the alumina mother liquor obtained in step (1) is subjected to cooling treatment, the initial temperature of the alumina mother liquor is 60°C, and the temperature of the alumina mother liquor aft...

Embodiment 3

[0042] This embodiment provides a method for removing gallium from the Bayer process mother liquor with low gallium concentration, and its process flow chart is as attached figure 1 As shown, the process steps include:

[0043] 1) Use the low-temperature Bayer process to dissolve bauxite to reduce the dissolution rate of metal gallium in the ore. The dissolution temperature is 135°C, and then use concentrated sodium hydroxide solution to convert aluminum hydroxide into sodium aluminate. By diluting and adding The aluminum hydroxide seeds cause the aluminum hydroxide to re-precipitate, and the solution after the aluminum hydroxide is collected is the alumina mother liquor, and the temperature of the alumina mother liquor is lower than 70°C.

[0044] 2) Cooling and removing impurities: the alumina mother liquor obtained in step (1) is subjected to cooling treatment. The initial temperature of the alumina mother liquor is 67° C., and the temperature of the alumina mother liquor a...

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Abstract

The invention provides a method for removing gallium from a low-gallium Bayer process mother liquor. The vanadium content of the Bayer process mother liquor is reduced in a cooling manner, and the temperature is controlled to be 30 + / -2 DEG C to reduce the influences of vanadium on resin. Proper resin and an adsorption process are selected to control the concentration of metallic gallium in the mother liquor, the adsorbed metallic gallium is transferred to other production lines, the time can be momentarily adjusted in the production process as needed, and the gallium-removed mother liquor isfurther purified to meet production needs. The method has the advantages of simple process, low purification cost, realization of high purity of the purified alumina mother liquor, production of high-purity aluminum through purification, and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of alumina production, in particular to a method for removing gallium from Bayer process mother liquor with low gallium concentration. Background technique [0002] Currently, aluminum has become one of the most widely used metals in the world. In recent years, as an environmentally friendly material for energy saving and consumption reduction, aluminum has been further expanded in terms of application scale and consumption, especially in the construction industry, transportation industry and packaging industry. The aluminum consumption of these three major industries usually accounts for the total aluminum sales volume of the year. About 60% of. [0003] With the gradual expansion of the use of aluminum and its alloys, especially in aviation, military and other fields, the quality requirements for aluminum are also getting higher and higher. To improve the quality of aluminum, in addition to the improveme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
CPCC01F7/47C01P2006/80
Inventor 杜善国周波
Owner 中铝山东有限公司
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