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Method for preparing solid sodium aluminate

A sodium aluminate and solid technology, applied in the field of preparation of solid sodium aluminate, can solve the problems of inability to meet user requirements, difficult to industrialized large-scale production, poor adaptability of raw materials, etc., and achieves convenient large-scale industrialized production, good product quality, and raw material cost. low effect

Active Publication Date: 2006-12-06
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its product index has decreased instant solubility and increased insoluble matter, which cannot meet user requirements.
[0009] The above-mentioned methods have their own advantages and disadvantages, and the product quality has its own characteristics, but there are generally disadvantages of low product quality, difficulty in industrialized large-scale production, and poor adaptability of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of solid sodium aluminate of the present invention, step is as follows:

[0031] (1) 200 g of bauxite with a particle size of 30 μm was reacted with 368 ml of liquid sodium hydroxide having a mass content of 30% of sodium oxide at a reaction temperature of 100° C. and a reaction time of 2 hours to obtain a crude liquid.

[0032] (2) Add milk of lime, a purification aid, to the crude liquid in an amount of 7% of the weight of the crude liquid, and filter to obtain the semen.

[0033] (3) Concentrate the semen, control the concentration of the concentrate to 33% after concentration, and keep the temperature at 90°C.

[0034] (4) Spray drying control: the air inlet temperature is 300°C, the flow rate of the concentrated solution is controlled at 9 L / min, and the concentrated solution is spray-dried to obtain 300 g of solid sodium aluminate product.

Embodiment 2

[0036] (1) 200 g of aluminum hydroxide trihydrate with a particle size of 70 μm was dissolved in 300 ml of water to react with 200 g of solid caustic soda at a reaction temperature of 110° C. and a reaction time of 2.5 hours to obtain a crude solution.

[0037] (2) Add 5 g of activated carbon to the crude liquid, filter to obtain semen.

[0038] (3) Concentrate the semen, control the concentration of the concentrated solution to 35% after concentration, and keep the temperature at 85°C.

[0039] (4) Spray drying control: the air inlet temperature is 400°C, and the concentrate flow rate is controlled at 11L / min. The concentrated solution was spray-dried to obtain 300 g of solid sodium aluminate product.

Embodiment 3

[0041] (1) a particle size of 50% by weight of 100 μm aluminum hydroxide trihydrate and 50% by weight of aluminum hydroxide (alkali content 20%) 200g total, dissolved in 300ml of water with solid caustic soda 160g to react, simultaneously with the process 100 ml of alkali-containing waste liquid was mixed and reacted at a reaction temperature of 110° C. and a reaction time of 1 hour to obtain a crude liquid.

[0042] (2) Add purification aid lime milk to the thick liquid, the add-on is 7% of the weight of the thick liquid, filter to obtain a semen, then add 5 g of activated carbon, and filter to obtain the semen.

[0043] (3) Concentrate the semen, control the concentration of the concentrate to 40% after concentration, and keep the temperature at 95°C.

[0044] (4) Spray drying control: the air inlet temperature is controlled at 350°C, and the concentrate flow rate is controlled at 12L / min. The concentrated solution was spray-dried to obtain 300 g of solid sodium aluminate p...

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Abstract

This invention relates to an improved method for preparing solid sodium aluminate. The method comprises: (1) reacting gibbsite and liquid base to obtain a coarse solution; (2) purifying to obtain a refined solution; (3) spray-drying to obtain the final product. The product has such advantages as high quality and high adaptability of raw materials, and is suitable for mass production.

Description

technical field [0001] The invention relates to an improved preparation method of solid sodium aluminate. Background technique [0002] The solid sodium aluminate described in the present invention is mainly used as water treatment purifying agent, high-grade paper shaping aid, quick-setting agent for cement and foundry, inhibitor for agate and ceramics, protective agent for steel surface treatment, and also used as non-toxic Feedstock for shaped alumina catalysts and molecular catalysts for the conversion of petroleum hydrocarbons. [0003] The difference in physical and chemical properties of solid sodium aluminate series products is mainly caused by the difference in production process. The difference in production process leads to the biggest difference in products in terms of raw material adaptability, particle size, instant solubility, insoluble matter, stability and other indicators. difference. [0004] At present, the production process of solid sodium aluminate c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
Inventor 高建阳王志陈玉国
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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