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Continuous carbonation decomposition for high concentration sodium aluminate solution

A technology of carbonation decomposition and sodium aluminate, which is applied in the direction of alkali metal aluminate/alumina/aluminum hydroxide preparation, etc., which can solve the problems of increasing aluminum hydroxide circulation, high equipment and power consumption, and large material circulation flow, etc. problems, to achieve the effect of reducing production costs, reducing equipment and power consumption, and reducing circulation flow

Inactive Publication Date: 2009-07-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the circulation amount of aluminum hydroxide will also be increased, resulting in a large circulation flow of materials, high equipment and power consumption, and increased production costs.

Method used

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  • Continuous carbonation decomposition for high concentration sodium aluminate solution

Examples

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Effect test

Embodiment 1

[0017] The obtained alumina concentration is 165g / l, α k The 1.42 sintering method-Bayer method mixed semen, the semen is pumped to four carbon tanks for three-stage continuous carbonation decomposition, and the first three carbon tanks are fed with CO 2 The gas is continuously carbonated and decomposed, and the last one is the discharge tank. The process conditions are controlled as follows: the first tank is fed with CO 2 There are three gas pipes of φ159, the residence time is controlled to be about 3 hours, and the decomposition rate is controlled at 25±2%; the second tank is fed with CO 2 The gas pipeline is φ159 with 5 pieces, the residence time is controlled to be about 4 hours, the decomposition rate is controlled at 70±2%, and the third tank is fed into CO 2 The gas pipeline is φ159 for 2 pieces, the residence time is controlled to be about 3 hours, and the decomposition rate is controlled at 87±2%; the fourth tank does not enter CO 2 Gas, stay and discharge, contro...

Embodiment 2

[0019] The prepared alumina concentration is 178g / l, α k The 1.43 sintering method-Bayer method mixed semen, the semen is pumped to four carbon tanks for three-stage continuous carbonation decomposition, and the first three carbon tanks are fed with CO 2 The gas is continuously carbonated and decomposed, and the last one is the discharge tank. The process conditions are controlled as follows: the first tank is fed with CO 2 There are three gas pipes of φ159, the control residence time is about 3.5 hours, and the decomposition rate is controlled at 25±2%; the second tank is fed into CO 2 The gas pipeline is 5 pieces of φ159, the residence time is controlled to be about 3.5 hours, the decomposition rate is controlled at 70±2%, and the third tank is fed into CO 2 The gas pipeline is φ159 for 2 pieces, the residence time is controlled to be about 3.5 hours, and the decomposition rate is controlled at 87±2%; the fourth tank does not enter CO 2 Gas, stay and discharge, control the...

Embodiment 3

[0021] The obtained alumina concentration is 182g / l, α k The 1.44 sintering method-Bayer method mixed semen, the semen is pumped to five carbon tanks for four-stage continuous carbonation decomposition, and the first four carbon tanks are fed with CO 2 The gas is continuously carbonated and decomposed, and the last one is the discharge tank. The process conditions are controlled as follows: the first tank is fed with CO 2 There are three gas pipes of φ159, the residence time is controlled to be about 3 hours, and the decomposition rate is controlled at 25±2%; the second tank is fed with CO 2 The gas pipeline is φ159 with 5 pieces, the residence time is controlled to be about 3 hours, the decomposition rate is controlled at 60±2%, and the third tank is fed into CO 2 The gas pipeline is φ159 with 5 pieces, the residence time is controlled to be about 3 hours, the decomposition rate is controlled at 70±2%, and the fourth tank is fed into CO 2 The gas pipeline is φ159 with 2 pie...

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Abstract

The invention discloses method concerning the continuous carbonation decomposition of a high concentration sodium aluminate solution, which comprises the following steps: delivering a refined solution with alumina concentration between 165g / l and 190g / l, and Alpha k between 1.42 and 1.44 to a first tank of carbon decomposing tanks connected in series by a pump, introducing CO2 gas to perform continuous carbonation decomposition; controlling the temperature of the first tank between 75 DEG C and 88 DEG C in the decomposition process, controlling the decomposing speed to be even so that the decomposing reaction is performed stably in 10 to 14 hours. Due to the adoption of the invention, the alumina concentration for decomposing the refined solution is greatly increased, the content of the effective ingredient in the material of the alumina production system is increased, the effective material amount passing through the equipment per area is increased, the circulating flow of the material is reduced, the consumption of the equipment and the power is reduced and the production cost is lowered.

Description

Technical field: [0001] The invention belongs to a method for carbonation decomposition of alumina production, in particular to a method for continuous carbonation decomposition of sodium aluminate solution. technical background: [0002] Continuous carbonization to produce alumina is a new technology being explored in alumina production. At present, the concentration of alumina in sodium aluminate solution used for carbonation decomposition in alumina production at home and abroad is relatively low, about 110-130g / l. This process is more beneficial to the strength and strength index of carbon products, and the produced carbon AH crystals are mosaic type, with better structure and better particle size. However, the concentration of alumina used in this process is low, resulting in low content of useful components in the materials of the alumina production system, and the amount of useful materials passing through the equipment per unit area is small, resulting in a large ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 刘建刚王奎龚智远何在平李长江刘毅伍良渝周江筑卢占勇龚强刘德宽刘昌洌甘孝和龚启文杜江洁冯虎莫小平兰贵林张渝梁寿喜何璞睿张磊
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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