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Method for producing high-whiteness aluminum hydroxide by two-stage decomposition method

A technology of aluminum hydroxide and decomposition method, applied in the direction of alumina/aluminum hydroxide, etc., can solve problems such as unqualified whiteness and chroma, adverse effects on product quality, fluctuations, etc., to eliminate fluctuations, stabilize product chroma and The effect of whiteness and stable quality

Active Publication Date: 2012-02-08
中铝山东工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the sintering method, due to fluctuations in clinker iron content, fluctuations in clinker sintering conditions, circulating solution with certain impurities entering the sintering process, and fluctuations in desiliconization, the sintering method for producing high-white aluminum hydroxide Fluctuations in the impurity content of the semen lead to fluctuations in its color, that is, fluctuations in the b value, which eventually lead to fluctuations in the whiteness and chroma of the obtained high-white aluminum hydroxide product, and even unqualified whiteness and chroma, which have a negative impact on product quality. cause obvious adverse effects

Method used

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  • Method for producing high-whiteness aluminum hydroxide by two-stage decomposition method
  • Method for producing high-whiteness aluminum hydroxide by two-stage decomposition method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The carbon sub-tank is connected in series by n carbon sub-tanks, and the semen, that is, 115g / l Na 2 o T , 105g / l Al 2 o 3 Pumped into n carbon tanks in series for n-1 level carbonation decomposition (see figure 1 ), the nth slot is the last slot, that is, the discharge slot. Among them, only the second tank and the last tank are not ventilated, and the other tanks are all ventilated with CO 2 gas. CO in the first tank 2 The gas makes the semen carbonation and decomposition, and the decomposition rate is controlled at 15%. Send the semen decomposed by carbonation to the second tank of the carbon tank (the tank is not connected to CO 2 gas) for uniform stirring. After stirring, take out a part of the slurry from the second tank (the amount of the slurry can be taken out according to actual needs) and filter to separate the solid from the liquid. After filtering, the ion content in the filtrate Fe is less than 1ppm, and the b value drops to 0.7. The solution ob...

Embodiment 2

[0019] The semen, namely 115g / l Na 2 o T , 105g / l Al 2 o 3 Pumped into the series of carbon tanks, the first tank through CO 2 The gas makes the semen carbonation and decomposition, and the decomposition rate is controlled at 10%. Send the semen decomposed by carbonation to the second tank of the carbon tank (the tank is not connected to CO 2 gas) for uniform stirring. After stirring, take out a part of the slurry from the second tank (the amount of the slurry can be taken out according to actual needs) and filter to separate the solid from the liquid. After filtering, the Fe ion content in the filtrate is less than 1ppm, and the b value drops to 0.6. The solution obtained from solid-liquid separation is continuously sorted by the existing seed sorting process, and high white aluminum hydroxide with a whiteness greater than 95% and a b value of 0.4 can be obtained. The solid obtained from the solid-liquid separation is transferred together with the remaining slurry in t...

Embodiment 3

[0021] Na 2 o T 125g / l, Al 2 o 3 115g / l pumped into the series of carbon tanks, the first tank through CO 2 The gas makes the semen carbonation and decomposition, and the decomposition rate is controlled at 5%. The Na after carbonation decomposition 2 o T and Al 2 o 3 Send to the second tank of the carbon tank (the tank is not connected to CO 2 gas) for uniform stirring. After stirring, take a part of the slurry from the second tank (the amount of the slurry can be taken out according to actual needs) and filter to separate the solid from the liquid. After filtering, the Fe ion content of the filtrate is less than 1ppm, and the b value drops to 0.6. The solution obtained from solid-liquid separation is continuously sorted by conventional methods, which is a common process in alumina production, to obtain high-white aluminum hydroxide with a whiteness greater than 95% and a b value of 0.4. The solid obtained from the solid-liquid separation is transferred together ...

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Abstract

The invention relates to preparation of aluminum hydroxide, in particular to a method for producing high-whiteness aluminum hydroxide by a two-stage decomposition method. The method comprises the following steps of: decomposing carbonic acid in refining solution into which CO2 is introduced and which is delivered to a carbon decomposing tank from the first tank, transferring the refining solutionin which the carbonic acid is decomposed to a second tank of the carbon decomposing tank for stirring, and after stirring, performing solid-liquid separation; and performing carbon decomposition or continuous seed decomposition of the solution obtained after the solid-liquid separation to obtain the high-whiteness aluminum hydroxide. By adopting the preparation method, the color fluctuation of the aluminum hydroxide stock solution, namely the refining solution, caused by the fluctuation in the production process of a sintering method is eliminated, and the quality of the high-whiteness aluminum hydroxide is stabilized.

Description

technical field [0001] The invention relates to the field of aluminum hydroxide preparation, in particular to a method for producing high-white aluminum hydroxide by adopting a two-stage decomposition method. Background technique [0002] High-white aluminum hydroxide is commonly used in artificial marble plates, and artificial marble has very high and strict requirements on the whiteness and chroma of high-white aluminum hydroxide. Due to the large amount of organic matter in the Bayer process, it is difficult to obtain white aluminum hydroxide. Generally, aluminum hydroxide redissolution or liquid roasting technology is used to obtain a colorless and pure sodium aluminate solution, which is then decomposed to obtain high white aluminum hydroxide. The sintering method has the unique advantage of producing high-white aluminum hydroxide. During the sintering and desiliconization process of the sintering method, not only organic matter is removed, but also impurity ions such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 李文成王晓锋周晓燕戚丽娜徐立军李韶辉
Owner 中铝山东工程技术有限公司
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