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A method for producing wet process phosphoric acid by-product α hemihydrate gypsum whiskers and high purity and high whiteness α hemihydrate gypsum whiskers

A technology of hemihydrate gypsum and wet-process phosphoric acid, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., to achieve the effect of cost saving

Active Publication Date: 2017-08-08
贵州正磷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After searching, there are no relevant patents and reports on the industrialized large-scale production process and method of wet-process phosphoric acid that can simultaneously by-produce two kinds of α-hemihydrate gypsum whiskers

Method used

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  • A method for producing wet process phosphoric acid by-product α hemihydrate gypsum whiskers and high purity and high whiteness α hemihydrate gypsum whiskers

Examples

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Embodiment 1

[0043] Raw material 1: Phosphate rock, collection location: Kailin, Guizhou;

[0044] Raw material 2: sodium citrate, commercially available;

[0045] Raw material 3: aluminum sulfate, commercially available;

[0046] Raw material 4: sodium dodecylsulfonate, commercially available;

[0047] Raw material 5: sulfuric acid, concentration is 97%, commercially available;

[0048] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0049] A method for producing wet-process phosphoric acid byproduct α hemihydrate gypsum whiskers and high-purity and high whiteness α hemihydrate gypsum whiskers, comprising steps as follows:

[0050] (1) Add excess phosphoric acid and phosphate rock powder into the extraction tank, the solid-to-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:17, the concentration of phosphoric acid is 20wt%, under th...

Embodiment 2

[0059] Raw material 1: Phosphate rock, collection location: Kailin, Guizhou;

[0060] Raw material 2: sodium citrate, commercially available;

[0061] Raw material 3: iron sulfate, commercially available;

[0062] Raw material 4: sulfuric acid, concentration is 97%, commercially available;

[0063] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0064] A method for producing wet-process phosphoric acid byproduct α hemihydrate gypsum whiskers and high-purity and high whiteness α hemihydrate gypsum whiskers, comprising steps as follows:

[0065] (1) Add phosphate rock powder and excess phosphoric acid into the extraction tank. The solid-to-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:20, and the concentration of phosphoric acid is 24wt%. Under the condition of constant stirring, after the extraction reaction is complete...

Embodiment 3

[0074] Raw material 1: Phosphate rock, collection location: Kailin, Guizhou;

[0075] Raw material 2: magnesium citrate, commercially available;

[0076] Raw material 3: aluminum sulfate, commercially available;

[0077] Raw material 4: sulfuric acid, concentration is 97%, commercially available;

[0078] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0079] A method for producing wet-process phosphoric acid byproduct α hemihydrate gypsum whiskers and high-purity and high whiteness α hemihydrate gypsum whiskers, comprising steps as follows:

[0080] (1) Add phosphate rock powder and excess phosphoric acid into the extraction tank. The solid-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:22, and the concentration of phosphoric acid is 25wt%. Under the condition of constant stirring, after the extraction reaction is comp...

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Abstract

The invention relates to a method for producing α-hemihydrate gypsum whiskers and high-purity and high-whiteness α-hemihydrate gypsum whiskers produced by wet-process phosphoric acid. After adding phosphoric acid and phosphate rock powder into an extraction tank for extraction reaction, adding sulfuric acid to continue the reaction , make 30%~50% of calcium ions generate dihydrate gypsum, send the dihydrate gypsum into the crystal transformation tank, add crystal transformation agent, and obtain 30%~50% ordinary α hemihydrate gypsum whiskers. In addition, 50% to 70% of calcium ions exist in the phosphoric acid leaching solution in the form of calcium dihydrogen phosphate. After separation, the phosphoric acid leaching solution is introduced into the decalcification reaction tank, and after adding the sulfuric acid solution diluted with the lotion, the calcium is decalcified first. Then the solid is subjected to a crystallization reaction to generate high-purity and high-whiteness alpha hemihydrate gypsum whiskers. The invention not only reduces the phosphorus content in the by-product α hemihydrate gypsum whiskers, but also realizes the industrialized production of ordinary α hemihydrate gypsum whiskers and high-purity and high whiteness α hemihydrate gypsum whiskers produced by wet-process phosphoric acid, and can Meet different industrial production requirements and market demands.

Description

technical field [0001] The invention relates to a production method of α hemihydrate gypsum whiskers, in particular to a method for producing α hemihydrate gypsum whiskers by-product of wet-process phosphoric acid and high-purity and high whiteness α hemihydrate gypsum whiskers. Background technique [0002] α hemihydrate gypsum whiskers have high strength and use value. Compared with other short fibers, calcium sulfate whiskers have the advantages of high temperature resistance, chemical corrosion resistance, good toughness, high strength, and strong affinity with polymers such as rubber and plastics, and the price is the lowest among whiskers, only carbonization It is 1 / 200~1 / 300 of whiskers such as silicon, and has unparalleled cost performance compared to other whiskers. It has a wide range of applications. It is a green environmental protection material with excellent performance and low price, and has strong market competitiveness. [0003] Chinese patent document CN1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/14
Inventor 姚华龙胡兆平陈宏坤刘永秀庞世花李成志
Owner 贵州正磷科技有限公司
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