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Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive

A kind of alumina and Bayer technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of affecting alumina strength, refinement, affecting production sections, etc., to improve strength and particle size, improve decomposition rate, and species separation. The effect of increasing the decomposition rate

Inactive Publication Date: 2015-03-18
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] During the "Eighth Five-Year Plan" period in China, the strength of large state-owned enterprises and related research institutes of Aluminum Corporation of China was concentrated in an attempt to solve the problem of poor particle size and low strength of powdered alumina by changing the production process, but failed
[0006] At present, the additives used at home and abroad for the decomposition of Bayer process sodium aluminate solution seed crystals are water-dispersible additives or oil-soluble additives, all of which belong to additives that increase the particle size of alumina. Although this additive can increase the particle size of alumina, it will cause Reduce the decomposition rate of sodium aluminate solution or affect the strength of alumina
Additives that increase the decomposition rate often cause the refinement of the product alumina
In addition, for my country's diaspore ore, water-soluble additives and water-dispersible additives, foams are often generated due to its residue in the decomposition solution, which affects other production processes

Method used

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  • Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive
  • Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive
  • Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Synthetic method of polystyrene-acrylamide-acrylic acid

[0041] Dissolve 20g of acrylamide in 40 mL of water, add 0.008g of chain extender MPMD (2-methyl-1,5-pentanediamine), slowly pour into a four-neck flask, slowly pour 1.2g of ST-80 emulsifier into a four-necked flask, then add styrene into the reaction system, blow in nitrogen for 20 minutes, add 0.010 g of azobisisobutyronitrile initiator, and react for 1 hour at 30°C under stirring at 300 r / min, and then Under 100r / min stirring, the polymerization reaction was completed in 4 hours;

[0042] Add 40% NaOH slowly into the above solution, and hydrolyze for 1 hour at 60°C; after the reaction, add 10% hydrochloric acid to adjust the pH to 4.5, add methanol until the product precipitates completely and separate; then use 3 Soak in twice the amount of toluene, remove the styrene copolymer, and dry to obtain polystyrene-acrylamide-acrylic acid;

[0043] The ST-80 emulsifier mentioned above is compounded...

Embodiment 2

[0047] Example 2 Preferred additive formula and preparation method thereof

[0048]

[0049]The above-mentioned preparation method of the polymer emulsion type decomposition additive used in the Bayer process alumina production process comprises the following steps:

[0050] (1) Mix polystyrene-acrylamide-acrylic acid with water, stir and dissolve in a water bath at 45°C to form a homogeneous liquid;

[0051] (2) Mix silyl ring carboxylic acid with alcohol, stir and dissolve into solution;

[0052] (3) Mix the product of step (1) and (2), under stirring, add NaOH to adjust the pH, and stir at high speed for 30 minutes to obtain the product.

[0053] At the initial stage of decomposition of the Bayer process sodium aluminate solution, the amount added at one time is 25 mg / L, and the laboratory results are shown in Table 2.

[0054]

[0055] From the test results in Table 2, it can be seen that compared with the blank, the additive can increase the average particle siz...

Embodiment 3

[0058] The preferred additive formula is shown in Table 3, and the experimental results are shown in Table 4

[0059]

[0060] The above-mentioned preparation method of the polymer emulsion type decomposition additive used in the Bayer process alumina production process comprises the following steps:

[0061] (1) Mix polystyrene-acrylamide-acrylic acid with water, stir and dissolve in a water bath at 45°C to form a homogeneous liquid;

[0062] (2) Mix silyl ring carboxylic acid with alcohol, stir and dissolve into solution;

[0063] (3) Mix the product of step (1) and (2), under stirring, add NaOH to adjust the pH, and stir at high speed for 30 minutes to obtain the product.

[0064] At the initial stage of decomposition of the Bayer process sodium aluminate solution, the amount added at one time was 25 mg / L, and the laboratory results are shown in Table 4.

[0065]

[0066] The above-mentioned preparation method of the polymer emulsion type decomposition additive us...

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Abstract

The invention discloses an additive applied to a process for producing aluminum oxide by a bayer method and a preparation method of the additive. The additive comprises the following components in percentage by mass: 0.1 to 20 percent of polystyrene-acrylamide-crylic acid, 1 to 30 percent of silicon alkyl phenyl carboxylic acid, 1 to 20 percent of alcohol, 0.2 to 5 percent of NaOH and the balance of water. The preparation method comprises the following steps: mixing the polystyrene-acrylamide-crylic acid and water, and stirring and dissolving the mixture in the water bath at the temperature of between 30 and 55 DEG C to form uniform liquid; mixing the silicon alkyl cyclic carboxylic acid and the alcohol, stirring and dissolving into solution; and mixing the liquid and the solution, adding the NaOH with stirring to adjust the pH value to be 8 to 11, and stirring at high speed for 30 minutes to obtain product. The additive is applied to the process of producing the aluminum oxide by the bayer method, so that the strength and the granularity of the aluminum oxide can be improved.

Description

technical field [0001] The invention relates to an additive used in the Bayer process for producing alumina and a preparation method thereof. Background technique [0002] Alumina is the main raw material for the production of electrolytic aluminum, and it is also an indispensable and important raw material for industries such as electronics, chemical industry, refractory materials, and ceramics. In recent years, due to the needs of environmental protection and energy saving in electrolytic aluminum plants, especially the promotion of dry flue gas purification and large-scale automatic point-type feeding pre-baking tanks, not only the purity of alumina, but also the physical properties of alumina have also been raised. strict requirements. [0003] The decomposition of sodium aluminate solution seed crystals is one of the important processes in the production of alumina by the Bayer process. The Bayer process in my country uses insoluble diaspore bauxite as raw material, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 陈锋颜虎林陈自强王磊
Owner NORTHEASTERN UNIV LIAONING
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