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Separation purification method for iron ion in sodium aluminate solution

A sodium aluminate and iron ion technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of high price of iron-removing reagents, large loss of aluminum elements, complicated process flow, etc. Stable and reliable source of raw materials, strong adsorption capacity, simple and easy-to-control process

Inactive Publication Date: 2008-12-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of them have the following weaknesses: (1) the added iron removal reagent is expensive; (2) Fe 2+ Oxidized to Fe 3+ (3) The material flow rate is large, the technological process is complicated, and the operation is cumbersome; (4) The accumulation and pollution of other impurities are brought, and the loss of aluminum element along with the separation and purification of iron is relatively large; (5) The iron that is separated and removed is colloidal Precipitate, extremely difficult to separate by filtration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 1000g of industrial aluminum hydroxide, put it into an oven, dry it at 110°C for 2.5 hours, then transfer it to a ceramic crucible, put it in a muffle furnace and bake it at 550°C for 2 hours, and the preparation process of the high-efficiency active iron remover is completed.

[0014] Add the prepared iron remover to the aluminum salt (aluminate) solution that needs to be purified and remove iron, and adjust the amount of iron remover to 15-50g / L according to the iron content in the solution. The temperature of the solution is controlled at 30-65° C., and the iron ions in the adsorption solution are stirred for 20-30 minutes. Using the strong adsorption capacity of the iron remover, all the iron ions that need to be removed in the solution are adsorbed on the iron remover, and then the iron remover is separated. The aluminum salt (aluminate) solution has completed the purification and iron removal process, and the separated iron remover can be reused or de-regener...

Embodiment 2

[0019] Use bauxite to produce aluminum sulfate. The iron minerals contained in bauxite are also dissolved in the sulfuric acid leaching solution, and will be precipitated when aluminum sulfate crystallizes. The iron content of the product can reach more than 1%, and the product quality can only be inferior. , using the method for the separation and purification of iron ions in the aluminum salt (aluminate) solution of the present invention, the addition of the iron removal agent is 45g / L, the solution temperature is 45°C, stirring and adsorbing for 30 minutes, and the iron removal agent is separated. The iron content of the product is reduced to 0.015%, which meets the index requirements of superior products.

Embodiment 3

[0021] The industrial sodium aluminate solution is used to purify and remove iron after many times of deactivation. Soak in 5% hydrochloric acid solution at room temperature for 25 minutes, filter, wash, dry and reuse. The added amount of the regenerated iron remover is 20g / L, the solution temperature is 45°C, stirred and adsorbed for 30 minutes, and the iron remover is separated. The prepared 4A zeolite product has a whiteness of 96.8%; the regenerated iron remover still maintains a strong ability to adsorb and purify iron ions.

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Abstract

The invention relates to a method for separating and purifying iron ions in a sodium aluminate solution. The method is characterized in that: powdery activated alumina as a deironing agent is added into the sodium aluminate solution, stirred, absorbed, filtered and separated to obtain the purified sodium aluminate solution and the alumina as the de-ironing agent which absorbs iron impurities. In the method, the de-ironing material has a stable and reliable source, and the method for preparing the de-ironing agent is simple and feasible and uses industrial products with quite cheap prices. The method for separating and purifying the iron ions in the sodium aluminate solution effectively simplifies the technical flow of the de-ironing process, reduces production cost and is easy to popularize and apply in industry.

Description

technical field [0001] The invention relates to a method for separating and purifying iron ions in a sodium aluminate solution. Background technique [0002] Aluminum salt (aluminate) solution is the most basic original solution for producing alumina and aluminum. The purity of the chemical composition of the solution directly affects the chemical purity and product quality indicators of the obtained product. Aluminum salt (aluminate) solutions are prepared by alkali method or acid method, sodium aluminate solution is prepared by alkali method, and aluminum sulfate, aluminum chloride and aluminum nitrate solutions can be obtained by acid method. Because most of them are prepared by using bauxite or aluminum-containing minerals, bauxite or aluminum-containing minerals contain a large amount of impurities, which will more or less enter the product during the preparation process. Therefore, the separation and purification of impurities in the aluminum salt (aluminate) solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
Inventor 张学英吴钢全玉安松琦王红伟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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