Method for removing iron from sodium aluminate solution

A sodium aluminate and sodium ferroaluminate technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of complex operation, high cost of iron removal methods, and limited iron removal effect, and achieves Low process cost, good iron removal effect, and great promotion and application value

Active Publication Date: 2015-08-19
DATANG INT HIGH ALUMINA COAL R & D CENT
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Problems solved by technology

[0004] The invention provides a method for removing iron from a sodium aluminate solution, which is used to solve technical

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  • Method for removing iron from sodium aluminate solution

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Example Embodiment

[0021] Example 1

[0022] Take 100 grams of high-aluminum fly ash (48% alumina content and 40% silica content), add 20 grams of sodium hydroxide solution with a mass percentage of 20% to it, mix well, and place the mixture inside In a reactor lined with polytetrafluoroethylene, the desiliconization reaction is carried out at 90°C, the reactant is taken out after 4 hours of reaction, and filtered to obtain a desiliconization solution and filter residue. Add lime milk to the desiliconization solution, stir at room temperature for 1 hour, filter, dealkalize, wash, and dry to obtain active calcium silicate. The scanning electron microscope image is as follows figure 1 Shown. The results show that the active calcium silicate is spherical, with many wrinkles on the surface, mainly honeycomb, layered, and curled layered. The internal and surface pores of the particles are developed. The particle size is 20-40μm, and the pore size is 2-45nm. , The specific surface area can reach 160m 2...

Example Embodiment

[0024] Example 2

[0025] Take 1L industrial sintering sodium aluminate solution (Al 2 O 3 The content is 96.83g / L, Fe 2 O 3 The content is 0.0152g / L, the causticity ratio is α k 1.2), put it in a temperature-controllable laboratory decomposition tank, then add 10 grams of active calcium silicate prepared in Example 1, and stir at a constant speed for 120 minutes at a rotation speed of 300r / min and a temperature of 90°C, and the stirring is complete Afterwards, it was taken out and separated by filtration to obtain a solution of sodium dealoaluminate. After chemical analysis, the Al in the deferrified sodium aluminate solution 2 O 3 The content is 96.21g / L, Fe 2 O 3 The content is 0.0015g / L, and the iron removal rate is 90.13%.

Example Embodiment

[0026] Example 3

[0027] Take 1L industrial sintering sodium aluminate solution (Al 2 O 3 The content is 105.24g / L, Fe 2 O 3 The content is 0.0101g / L, causticity ratio α k 1.2), put it in a temperature-controllable laboratory decomposition tank, then add 15 grams of active calcium silicate prepared in Example 1, and stir at a constant speed for 60 minutes at a speed of 100r / min and 60°C, and the stirring is complete Afterwards, it was taken out and separated by filtration to obtain a solution of sodium dealoaluminate. After chemical analysis, the Al in the deferrified sodium aluminate solution 2 O 3 The concentration is 104.92g / L, Fe 2 O 3 The concentration is 0.0019g / L, and the iron removal rate is 81.19%.

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Abstract

The invention provides a method for removing iron from a sodium aluminate solution. The method comprises the following steps: adding active calcium silicate into the sodium aluminate solution and then performing solid-liquid separation to obtain the iron-removed sodium aluminate solution; wherein the grain size of the active calcium silicate is smaller than 40 mu m, the aperture is 2-50 nm, and the specific surface area is 150-200 m<2>/g. The method disclosed by the invention is simple and convenient to operate, low in cost and power consumption and good in the iron removal effect.

Description

Technical field [0001] The invention relates to a method for removing iron, in particular to a method for removing iron from a sodium aluminate solution. Background technique [0002] At present, the first grade of metallurgical alumina in the national alumina standard requires Fe 2 O 3 ≤0.02%, and some special-purpose chemicals require lower iron content. However, the sodium aluminate solution from industrial sources contains a small amount of iron, which will enter the alumina product in the subsequent production, thereby affecting the product quality index and product whiteness. With the development of the electrolytic aluminum industry and the chemical alumina industry, especially in the production of high-purity alumina products and zeolite products, the purity and whiteness of the products are difficult to meet the quality requirements, so the requirements for the control of the iron content in the alumina The higher the price, the iron in the sodium aluminate solution has...

Claims

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Application Information

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IPC IPC(8): C01F7/04
Inventor 洪景南张战军杨会宾许学斌
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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