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Production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers

A technology of hemihydrate gypsum and wet-process phosphoric acid, which is applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of high content of phosphorus pentoxide, reduction of whisker phosphorus content, and unapplied large-scale industrial production , to achieve the effects of recycling, improving production efficiency, shortening the time required for reaction and aging

Active Publication Date: 2015-12-09
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

[0007] In summary, the existing problems in the prior art are: firstly, the content of phosphorus pentoxide in the generated gypsum whiskers is relatively high, and it is difficult to further reduce the phosphorus content of the whiskers; secondly, only dihydrate gypsum whiskers are obtained, which requires subsequent processing In order to become a product with higher added value such as α hemihydrate gypsum whisker or β hemihydrate gypsum whisker; third, the production method of gypsum whisker with low phosphorus content is limited to the laboratory research stage and has not been applied to industrialized large-scale production

Method used

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  • Production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers
  • Production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers
  • Production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1. The phosphate rock is collected in Kailin, Guizhou; the content of phosphorus pentoxide in the phosphate rock is about 30%.

[0053] A kind of production method of wet-process phosphoric acid by-product α hemihydrate gypsum whisker, comprises the steps:

[0054] (1) First, the phosphate rock powder and the dilute sulfuric acid with a mass concentration of 20% are added to the extraction tank at a solid-to-liquid mass ratio of 1:5, the fineness of the phosphate rock powder is 80 mesh, and the content of phosphorus pentoxide in the phosphate rock is 30% , under constant stirring, control the temperature of the extraction tank at 25°C for extraction reaction for 30 minutes to obtain mixed slurry A;

[0055] (2) 1 / 8 of the volume of the mixed slurry A obtained in step (1) is separated through a filter for solid-liquid separation, and the separated clear liquid B is sent to the acid store as finished phosphoric acid, and the solid C is mixed with the remaining ...

Embodiment 2

[0062] Embodiment 2, the phosphate rock is collected in Lufa, Guizhou; the content of phosphorus pentoxide in the phosphate rock is 29%.

[0063] A kind of production method of wet-process phosphoric acid by-product α hemihydrate gypsum whisker, comprises the steps:

[0064] (1) Firstly, phosphate rock powder and dilute sulfuric acid with a mass concentration of 30% are added to the extraction tank at a solid-to-liquid mass ratio of 1:4. The fineness of the phosphate rock powder is 100 mesh, and the content of phosphorus pentoxide in the phosphate rock is 29%. , under continuous stirring, control the temperature of the extraction tank at 35° C. to carry out the extraction reaction for 50 minutes to obtain the mixed slurry A.

[0065] (2) 1 / 3 of the mixed slurry A obtained in the step (1) is separated from the volume through a filter for solid-liquid separation, and the separated clear liquid B is sent to the acid store as finished phosphoric acid, and the solid C is mixed with...

Embodiment 3

[0073] A kind of method of producing wet-process phosphoric acid by-product α hemihydrate gypsum whiskers described in Example 1, the difference is that the crystal modifier component and content of use are different, as shown in table 1:

[0074] Table 1 crystal transformation agent component, content and the performance that obtain product

[0075]

[0076] It can be seen from the above table that the aspect ratio of the α hemihydrate gypsum whiskers prepared by the present invention ranges from 10 to 100, and the aspect ratio can be controlled. By adjusting the formula of the crystal modifier, α hemihydrate gypsum crystals with different aspect ratios can be prepared. Must be used to apply to different market demands.

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Abstract

The invention discloses a production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers. The production method comprises the following steps: adding phosphate rock powder and partial dilute sulfuric acid into an extraction tank for extraction reaction, feeding clear liquid separated from the obtained mixed slurry to an acid warehouse, transferring separated solids and residual mixed slurry to a crystal transformation tank, adding sulfuric acid and a crystal modifier into the crystal transformation tank, carrying out crystal transformation reaction for 2-9 h under the condition that the temperature of the crystal transformation tank is kept to be 40-130 DEG C, and carrying out solid-liquid separation on the obtained acid-mixed slurry, so as to obtain solids namely the alpha semi-hydrated gypsum whiskers. According to the invention, a conventional process and technology are improved, discharge of ardealite and acid-insoluble substances is eliminated, and the content of phosphorus in gypsum is reduced, the utilization ratio of phosphorus is increased, dilution heat of concentrated sulfuric acid is used fully and energy conservation and emission reduction are realized.

Description

technical field [0001] The invention relates to a production method of wet-process phosphoric acid, in particular to a production method of α-hemihydrate gypsum whiskers produced by wet-process phosphoric acid. Background technique [0002] The so-called "wet-process phosphoric acid" actually refers to the sulfuric acid wet-process phosphoric acid, that is, the phosphoric acid produced by decomposing phosphate rock with sulfuric acid. More than 80% of phosphoric acid in my country is produced by the wet process phosphoric acid dihydrate process. However, there are still some insurmountable defects in the dihydric process. The by-product phosphogypsum is subject to many restrictions because of its high phosphorus content. coagulant, most of the phosphogypsum is discarded and stockpiled, causing serious pollution and waste. Therefore, the traditional wet-process phosphoric acid process needs to be further improved to reduce the phosphorus content in phosphogypsum, thereby tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/46C04B11/26
Inventor 陈宏坤姚华龙胡兆平刘永秀李成志张西兴
Owner 贵州正磷科技有限公司
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