Bauxite low temperature continuous dissolving out technology

A bauxite, low-temperature technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of high energy consumption and large equipment investment, and achieve the simplification of employee operation, reduction of operation intensity and operation. simple effect

Active Publication Date: 2006-06-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolution process, as the leading process of alumina production, has many dissolution methods. Many Bayer production lines adopt high temperature dissolution (dissolution temperature is 250-280°C), which requires large equipment investment and high energy consumption.
And the Bayer method does not have a special desiliconization process, but quartz, as a harmful substance produced by alumina, must be removed to the maximum extent, so it is particularly important to use a good process to remove silica

Method used

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  • Bauxite low temperature continuous dissolving out technology
  • Bauxite low temperature continuous dissolving out technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The main components of bauxite are: aluminum oxide 52%, iron oxide 8.2%, silicon oxide 5.8%, aluminum silicon ratio 8.96, the treatment process of low temperature continuous dissolution process is as follows:

[0021] Firstly, it is ground to a solid content of 300g / l and a fineness of +100 # 45% qualified pulp, the pulp temperature is 65°C, and then at 150m 3 The feed rate of / h enters the pipeline dissolution device. There is a heated steam chamber outside the dissolution pipeline. The dissolution tube is spirally coiled from bottom to top. The first layer of the feed is heated by steam condensed water, and the second and third layers are from bottom to top. It is heated with secondary exhaust steam, the fourth and fifth layers are heated with primary exhaust steam, and the top four layers are heated with new steam with a steam pressure of 0.65MPa. The temperature is 142°C, the alumina concentration is 200g / l, the A / S value is 183, and the caustic ratio of the soluti...

Embodiment 2

[0024] The main components of bauxite are: 55% aluminum oxide, 8.8% iron oxide, 5.6% silicon oxide, and the treatment process of the low-temperature continuous dissolution process is as follows:

[0025] First grind it to a solid content of 250g / l, fineness +100 # 40% qualified pulp, the temperature of the pulp is 63°C, and then at 150m 3 The feed rate of / h enters the pipeline dissolution device, the new steam vapor pressure is 0.60MPa, after passing through the tubular dissolution with a flow rate of 1.6m / s, the discharge temperature is 135°C, the alumina concentration is 210g / l, A / S The value is 189, and the solution caustic ratio is 1.41. Then the slurry enters 42m in turn 3 The large and small 0.35MPa pressure insulation tanks are subjected to continuous four-stage heat preservation for 50 minutes. At this time, the desiliconization index is 210, and then enters two stages of self-evaporation cooling.

[0026] Others are basically the same as in Example 1.

Embodiment 3

[0028] The main components of bauxite are: 58% aluminum oxide, 10.4% iron oxide, 6.7% silicon oxide, and the treatment process of the low-temperature continuous dissolution process is as follows:

[0029] First grind it to a solid content of 340g / l, fineness +100 # 38% qualified pulp, the temperature of the pulp is 65°C, and then at 148m 3 The feed rate of / h enters the pipeline dissolution device, the new steam vapor pressure is 0.72MPa, after passing through the tubular dissolution with a flow rate of 1.8m / s, the discharge temperature is 145°C, the alumina concentration is 190g / l, A / S The value is 185, and the solution caustic ratio is 1.38. Then the slurry enters 42m in turn 3 The 0.46MPa pressure insulation tank with large and small sizes is subjected to continuous four-stage heat preservation for 55 minutes. At this time, the desiliconization index is 196, and then enters two-stage self-evaporation cooling.

[0030] Others are basically the same as in Example 1.

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Abstract

The invention belongs to the technical field of alumina production, and specifically relates to a low-temperature continuous dissolution process for bauxite, which includes pipeline dissolution, heat preservation and desilication under pressure, and self-evaporation cooling. The cooled exhaust steam is used for dissolution preheating; the pipeline dissolution is indirect steam heating and dissolution, and there is a heating steam chamber outside the dissolution pipeline, and the spirally coiled dissolution tube from bottom to top corresponds to the feed layer. First-level exhaust steam heating, first-level exhaust steam heating and fresh steam heating. The indirect heating of the bauxite low-temperature dissolution process of the present invention avoids the situation of directly heating the condensed water in the slurry, realizes continuous production, and makes effective use of steam condensed water and exhaust steam waste heat from evaporation and cooling, reducing The amount of steam is reduced, the energy consumption of production is reduced, the operation is simple, it is beneficial to the actual industrial production, and the economic and social benefits are considerable.

Description

technical field [0001] The invention relates to a bauxite dissolution process technology in alumina production, and belongs to the technical field of alumina production. Background technique [0002] Bauxite is currently the most important raw material in alumina production. It is divided into gibbsite type, boehmite type, diaspore type and various mixed types. Its properties and mineral composition determine alumina Currently, the production methods of alumina in the world mainly include Bayer method, sintering method and combined method. Most foreign alumina manufacturers use the Bayer method to produce alumina because they have gibbsite-type bauxite; my country is rich in bauxite resources, but most of the bauxite that has been discovered is diaspore type , gibbsite-type bauxite is very little, therefore, using imported gibbsite-type bauxite to produce alumina by Bayer process is a method for domestic production of alumina. [0003] The dissolution process is one of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/04
Inventor 张玉明温金德杜善国贾海龙马钦王利娟蒋涛刘志云徐伟平
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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