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Method for desiliconizing sodium aluminate solution

A sodium aluminate and desilicate sodium aluminate technology, applied in the field of desiliconization, can solve the problems of reducing the desiliconization production efficiency of sodium aluminate solution, increasing the energy consumption and production cost of the desiliconization process, and increasing the unit cost of alumina production, etc. , to achieve the effect of great promotion and application value, good economic benefits, and low cost of desiliconization

Inactive Publication Date: 2016-05-25
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the above-mentioned desilication method can meet the requirements of carbonation and decomposition of alumina produced by sintering to a certain extent, in order to obtain high-quality alumina products, the silicon content index of desilicate sodium aluminate semen still needs to be improved; in addition, the above-mentioned Methods Milk of lime is used as the calcium source for desiliconization during normal pressure desiliconization, thereby increasing the demand for limestone and the processes of limestone calcination and quicklime emulsification, which not only reduces the production efficiency of desiliconization of sodium aluminate solution, but also Increased energy consumption and production costs in the desiliconization process, which in turn increases the unit cost of alumina production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Sieve the waste slag produced by the production of polyvinyl chloride from calcium carbide, and collect the fine slag that passes through a 100-mesh sieve to obtain calcium carbide slag; after testing, Ca(OH) in the calcium carbide slag 2 The mass content of calcium carbide is not less than 65%, the effective calcium content is greater than 55%, and the particle size of carbide slag is less than 150 μm.

[0022] Get 1L industrial sintering method sodium aluminate crude solution (aluminum oxide concentration is 118.47g / L, SiO 2 The concentration is 0.41g / L, the caustic ratio is 1.2-1.3, and the silicon content index is 288.9), placed in a temperature-controllable reaction tank, and then 20 grams of calcium carbide slag is added to the reaction tank for desiliconization treatment. Stir at a constant speed of 300 r / min for 120 min under the condition, take out after the stirring is completed, and separate by filtration to obtain a sodium desilicate aluminate solution.

[...

Embodiment 2

[0025] Get 1L industrial sintering method sodium aluminate crude solution (aluminum oxide concentration is 98.65g / L, SiO 2 The concentration is 0.34g / L, the caustic ratio is 1.2-1.3, and the silicon content index is 290.1), placed in a temperature-controllable reaction tank, and then 10 grams of calcium carbide slag is added to the reaction tank for desiliconization treatment. Stir at a constant speed of 500 r / min for 120 min under the condition, take out after the stirring is completed, and separate by filtration to obtain a sodium desilicate aluminate solution.

[0026] After testing, the Al in the sodium aluminate solution 2 o 3 The concentration is 97.25g / L, SiO 2 The concentration is 0.12g / L, and the silicon content index is 810.4.

Embodiment 3

[0028] Get 1L industrial sintering method sodium aluminate crude solution (aluminum oxide concentration is 104.23g / L, SiO 2 The concentration is 0.43g / L, the caustic ratio is 1.2-1.3, and the silicon content index is 242.4), placed in a temperature-controllable reaction tank, and then 5 grams of carbide slag is added to the reaction tank for desiliconization treatment. Stir at a constant speed of 150 r / min for 180 min under the condition, take out after the stirring is completed, and separate by filtration to obtain a sodium desilicate aluminate solution.

[0029] After testing, the Al in the sodium aluminate solution 2 o 3 The concentration is 103.84g / L, SiO 2 The concentration is 0.145g / L, and the silicon content index is 716.1.

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Abstract

The invention provides a method for desiliconizing a sodium aluminate solution. The method comprises the following steps: adding carbide slag into the sodium aluminate solution to carry out desiliconization treatment to obtain a desiliconized sodium aluminate solution, wherein the mass content of Ca(OH)2 in the carbide slag is not less than 65 percent, the content of available calcium is more than 55 percent, and the grain size of the carbide slag is less than 150mu m. According to the method, the carbide slag is used as a desiliconizing raw material, recycling and environmental friendliness of waste materials can be realized, the desiliconization cost can be reduced, and the silicon index of the desiliconized sodium aluminate solution is more than or equal to 700.

Description

technical field [0001] The invention relates to a desiliconization method, in particular to a method for desiliconizing sodium aluminate solution. Background technique [0002] In the traditional sintering alumina production process, the crude sodium aluminate solution after clinker dissolution is usually desiliconized by a two-stage desiliconization process consisting of a pressurized desiliconization process and an atmospheric pressure desiliconization process. For example, in the patent with the publication number CN102249253A, first, sodium-silicon slag seed crystals are added to the crude sodium aluminate solution to carry out one-stage deep desiliconization to obtain a first-stage desiliconization refined liquid, and then part of the first-stage desiliconized refined liquid is subjected to a second-stage deep desiliconization Desiliconization to obtain the second-stage desilicate sodium aluminate semen; in the two-stage desilication, the first stage is to add sodium-si...

Claims

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Application Information

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IPC IPC(8): C01F7/04
CPCC01F7/04
Inventor 洪景南孙俊民高志军杨会宾胡剑许学斌王娜
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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