Calcium sulfate whisker and production method of raw material calcium sulfate thereof

A technology of calcium sulfate whisker and production method, applied in the directions of polycrystalline material growth, crystal growth, single crystal growth, etc., can solve the problems of intractable processing, low aspect ratio, difficult to carry out acid leaching, etc., and achieve significant economic benefits, The effect of low production cost and improved aspect ratio

Active Publication Date: 2021-09-21
YIBIN TIANYUAN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The quality of calcium sulfate whiskers produced by this method is poor, mainly reflected in low aspect ratio and low usable value
[0009] 2. The by-product of this scheme is a large amount of acidic wastewater, which is difficult to process. In this scheme, the acidic wastewater is returned to the acid leaching process and mixed with hydrochloric acid to leach carbide slag slurry, but this leads to the continuous dilution of HCl after the precipitation of calcium sulfate, and the acid It is difficult to carry out leaching; and the impurity ions in the acidic wastewater are continuously enriched with the process cycle, which has a serious impact on the quality of calcium sulfate whiskers; therefore, the acidic wastewater must still be discharged regularly, and its treatment is a major problem

Method used

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  • Calcium sulfate whisker and production method of raw material calcium sulfate thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Calcium sulfate whiskers are produced as follows:

[0040] (1) Dilute the filtered calcium carbide slag with water to the Ca(OH) in the slurry 2 The mass concentration of the solution is 260g / L, and the surplus chlorine gas in the chlor-alkali industry is passed into until the pH of the solution=4, the chlorine gas is stopped, and the first solution is obtained after a full reaction; the reaction temperature is 50°C, and Ca(ClO) 2 The concentration is 0.86mol / L, and the available chlorine content is 97g / L.

[0041] (2) adding NaOH to the first solution until the pH=7 of the solution stops adding NaOH to obtain the second solution;

[0042] (3) filtering the second solution to obtain the third solution;

[0043] (4) adding Glauber's salt to the third solution for full reaction, and obtaining a fourth solution after the reaction is completed; the reaction temperature is 60°C.

[0044] (5) filter the fourth solution to obtain calcium sulfate solid phase and supernatant...

Embodiment 2

[0050] Calcium sulfate whiskers are produced as follows:

[0051] (1) Dilute the calcium carbide slag (same batch as in Example 1) with water to the Ca(OH) in the slurry after pressure filtration 2 The mass concentration of the solution is 200g / L, and the excess chlorine gas in the chlor-alkali industry is passed into until the pH of the solution=6.5, the chlorine gas is stopped, and the first solution is obtained after a full reaction; Ca(ClO) 2 The concentration is 1.12mol / L, and the available chlorine content is 147g / L.

[0052] (2) adding NaOH to the first solution until the pH=9 of the solution stops adding NaOH to obtain the second solution;

[0053] (3) filtering the second solution to obtain the third solution;

[0054] (4) adding Glauber's salt to the third solution for full reaction, and obtaining a fourth solution after the reaction is completed; the reaction temperature is 50°C.

[0055] (5) filter the fourth solution to obtain calcium sulfate solid phase and s...

Embodiment 3

[0061] Calcium sulfate whiskers are produced as follows:

[0062] (1) Dilute the calcium carbide slag (same batch as in Example 1) with water to the Ca(OH) in the slurry after pressure filtration 2 The mass concentration of the solution is 300g / L, and the excess chlorine gas in the chlor-alkali industry is passed into until the pH of the solution=5, the chlorine gas is stopped, and the first solution is obtained after sufficient reaction; Ca(ClO) 2 The concentration is 0.66mol / L, and the available chlorine content is 105g / L.

[0063] (2) adding NaOH to the first solution until the pH=8 of the solution stops adding NaOH to obtain the second solution;

[0064] (3) filtering the second solution to obtain the third solution;

[0065] (4) adding Glauber's salt to the third solution for full reaction, and obtaining a fourth solution after the reaction is completed; the reaction temperature is 40°C.

[0066] (5) filter the fourth solution to obtain calcium sulfate solid phase and...

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Abstract

The invention discloses a production method of raw material calcium sulfate for producing calcium sulfate whiskers, which comprises the following steps: a. feeding chlorine gas into carbide slag; b. adding NaOH; c. adding NaOH after solid-liquid separation 2 SO 4 ; d, separating and washing the solid phase to obtain raw material calcium sulfate for the production of calcium sulfate whiskers. The invention also discloses a calcium sulfate raw material for producing calcium sulfate whiskers, which is prepared by the above method. The invention also discloses a method for producing calcium sulfate whiskers. The method uses the above-mentioned raw material calcium sulfate for producing calcium sulfate whiskers as a raw material for production. The invention also discloses a calcium sulfate whisker, the calcium sulfate whisker is produced by the above calcium sulfate whisker production method. The advantages are: 1) the length-to-diameter ratio of calcium sulfate whiskers is improved; 2) there is no by-product discharge problem; 3) the production raw materials used are all from industrial by-products, and the method has significant economic benefits.

Description

technical field [0001] The invention relates to a production method of calcium sulfate chemical products, in particular to a production method of calcium sulfate whiskers. Background technique [0002] Carbide slag is a by-product of acetylene gas obtained by hydrolysis of calcium carbide, and its main component is Ca(OH) 2 , and contains a variety of impurities. Affected by my country's energy structure, the production of vinyl chloride monomer from acetylene by calcium carbide method occupies a large proportion in my country. Adding water to 1.0t calcium carbide can produce more than 300kg of acetylene gas and more than 3.0t of calcium carbide slag with a solid content of about 50%. Because calcium carbide slag contains many types of impurities and the cost of purification is high, the value of its by-products is very low, and it is even piled up as waste in some areas, which has an impact on the environment. [0003] Calcium sulfate whiskers are acicular, fibrous subnan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B35/00C01B11/06C01F11/46C30B29/46C30B29/62
CPCC01B11/062C01F11/46C30B29/46C30B29/62C30B35/007
Inventor 邓敏石晓林缑可贞谢濠江
Owner YIBIN TIANYUAN GRP CO LTD
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