New decomposition method of sodium aluminate solution

A technology of sodium aluminate and a new method, applied in the field of decomposition of sodium aluminate solution, to achieve the effects of increasing production capacity, changing product levels, and shortening decomposition time

Inactive Publication Date: 2010-02-24
河南未来铝业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are still many problems in terms of technology, investment equipment and economic rationality

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of new method of sodium aluminate solution decomposition:

[0031] Combining sodium aluminate solution, propellant and inducer to produce ultrafine aluminum hydroxide:

[0032] Sodium aluminate solution, propellant and inducer are mixed and decomposed. After decomposition, the mother liquor and ultra-fine aluminum hydroxide are separated by a conventional separation system. The separated liquid phase is evaporated for the mother liquor. In the red mud washing, part of the backwater is used as the propellant for the decomposition of the sodium aluminate solution, and the separated solid phase is washed with aluminum hydroxide, and finally the product ultra-fine aluminum hydroxide is obtained, wherein:

[0033] Sodium aluminate solution composition: Al 2 o 3 164.63g / l, Na 2 o C 24.5g / l, α k It is 1.51, and the silicon content index is 205. Get sodium aluminate solution, add D50 and be 1.3 microns of aluminum hydroxide as inducer, the solid cont...

Embodiment 2

[0034] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0035] Sodium aluminate solution composition: Al 2 o 3 170.54g / l, Na 2 o C 23.2g / l, α kIt is 1.51, and the silicon content index is 230. Take sodium aluminate solution, add alumina hydrate with a D50 of 1.1 microns as an inducer, and after preparation, the solid content of aluminum hydroxide is 20g / l, and stir slowly at a stirring speed of 80r / min , after reacting for 5 hours, add evaporating return water at about 25°C, the volume ratio of the amount of evaporating return water to the sodium aluminate solution is 0.1:1, when the sodium aluminate solution decomposes, the initial decomposition temperature is 60°C, and the final decomposition temperature is 60°C. The temperature is 40°C, the decomposition time is 30 hours, and the decomposition rate is 66.8%; the composition of the obtained decomposition mother liquor is Al 2 o 3 51.47g / l, Na 2 o C 20.8g / l, α k It is 4.55, and the D50 of th...

Embodiment 3

[0036] Embodiment 3: a kind of novel method of sodium aluminate solution decomposition:

[0037] Sodium aluminate solution, propellant and inducer are mixed and decomposed. After the decomposition, the cyclone classification is carried out according to the conventional technology. After the cyclone classification, the overflow part and the underflow part are separated from hydrogen and aluminum respectively, and the overflow part is separated by hydrogen and aluminum The solid phase is decomposed again, the separated liquid phase and the underflow part are evaporated by the liquid phase separated by aluminum hydrogen, and the solid phase separated by the underflow part is washed by aluminum hydrogen, and finally the product aluminum hydroxide is obtained, wherein:

[0038] Sodium aluminate solution composition: Al 2 o 3 180.3g / l, Na 2 o C 26.5g / l, α k It is 1.45, and the silicon content index is 230; Get sodium aluminate solution, add the aluminum hydroxide that D50 is 4...

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Abstract

The invention discloses a new decomposition method of sodium aluminate solution. Compared with the prior art, the method is characterized in that inducer and propellent are added while in decomposition of sodium aluminate solution, the addition amount of the inducer is 10-800g per liter sodium aluminate solution, the addition amount of the propellent is 10-100% volume of the sodium aluminate solution, decomposition initial temperature in decomposition of sodium aluminate solution is 40-80 DEG C, decomposition final temperature is 30-60 DEG C, and decomposition time is 20-30 hours. The inducerand propellent are added in the process of decomposition of sodium aluminate solution, decomposition time is greatly reduced, decomposition rate is improved, and the grain of aluminium hydroxide product can be effectively controlled. The technical scheme of the invention produces no new pollution or waste, is environmentally friendly and energy-saving and has obvious social benefit.

Description

1. Technical field: [0001] The invention relates to a method for decomposing sodium aluminate solution, in particular to a new method for decomposing sodium aluminate solution introduced with inducer and propellant. 2. Background technology: [0002] Decomposition of sodium aluminate solution is one of the key processes in the production of Bayer alumina, and it is also the longest process. It directly affects the process indicators such as alkali cycle efficiency, aluminum hydroxide output rate, and evaporated water. Physical and chemical performance indicators also have a great impact. A good decomposition process of the sodium aluminate solution is the guarantee to obtain high-quality aluminum hydroxide products, and a good decomposition process of the sodium aluminate solution can also ensure that the mother liquor with a relatively high molecular ratio is obtained. [0003] The traditional decomposition methods of sodium aluminate solution include carbonation decomposi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 李民菁史智慧冉俊生段晶黎孙克晗翟福霞
Owner 河南未来铝业(集团)有限公司
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