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High-strength phosphogypsum powder and production method thereof

A production method and technology of gypsum powder, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low conversion rate, affecting the performance and process cost of high-strength gypsum powder, and low strength, so as to improve conversion rate and The effect of intensity

Pending Publication Date: 2022-06-21
临沂盛丰干燥设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When using phosphogypsum as raw material to prepare high-strength gypsum powder, the production process directly affects the performance and process cost of high-strength gypsum powder. The current production of phosphogypsum technology generally has the problems of low strength and low conversion rate.

Method used

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  • High-strength phosphogypsum powder and production method thereof
  • High-strength phosphogypsum powder and production method thereof
  • High-strength phosphogypsum powder and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for producing high-strength phosphogypsum powder, comprising the following steps:

[0033] (1) adding phosphate rock slurry and / or phosphate rock powder to the reaction tank, then adding sulfuric acid to react, the temperature of the reaction tank is 90 ° C, and reacted under this condition for 4 hours to obtain mixed slurry A;

[0034] (2) 40% of the volume of the mixed slurry A obtained in the step (1) is separated into solid-liquid separation to obtain clear liquid B and solid C, clear liquid B is sent to acid storage as finished phosphoric acid, and solid C is transferred to the reaction tank , the remaining mixed slurry A is transferred to the conversion tank;

[0035] (3) Add sulfuric acid to the conversion tank, add a surfactant-based crystallizer, and control the liquid-solid ratio and H in the mixed slurry 3 PO 4 and H 2 SO 4 The content of the conversion tank was maintained at 60°C for 2 hours; the organic acid type crystallizer was added, and the...

Embodiment 2

[0049] The difference from Example 1 is that the step (3) is to add sulfuric acid to the conversion tank, add a surfactant class crystallizer cetyl trimethyl ammonium bromide, and control the liquid-solid ratio and H in the mixed slurry. 3 PO 4 and H 2 SO 4 The mixed acid slurry D was obtained by maintaining the temperature of the conversion tank for 6 hours under the condition of 60°C.

Embodiment 3

[0051] Different from Example 1, the step (3) is to add sulfuric acid to the conversion tank, add an organic acid crystal-transforming agent sodium citrate, and control the liquid-solid ratio and H in the mixed slurry. 3 PO 4 and H 2 SO 4 The mixed acid slurry D was obtained by maintaining the temperature of the conversion tank under the condition of 80°C for 6 hours to react.

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Abstract

The invention belongs to the technical field of gypsum powder production, and particularly relates to high-strength phosphogypsum powder and a production method thereof. The method comprises the following steps: (1) adding phosphoric ore pulp and / or powdered rock phosphate into a reaction tank, then adding sulfuric acid for reaction, and controlling conditions to obtain mixed slurry A; (2) transferring part of the mixed slurry A obtained in the step (1) to a conversion tank; (3) adding sulfuric acid into a conversion tank, respectively adding a surfactant crystal modifier, an organic acid crystal modifier and an inorganic salt crystal modifier, controlling the liquid-solid ratio in the mixed slurry and the contents of H3PO4 and H2SO4, and adopting gradient crystal transformation control conditions to obtain mixed acid slurry D; and (4) carrying out solid-liquid separation on the mixed acid slurry D obtained in the step (3), washing and drying to obtain the high-strength phosphogypsum powder. The ardealite production process and the crystallizing agent are optimized, and gradient crystal transformation is adopted, so that the product strength and the conversion rate are improved.

Description

technical field [0001] The invention belongs to the technical field of gypsum powder production, and in particular relates to a high-strength phosphorous gypsum powder and a production method thereof. Background technique [0002] At present, most of the phosphogypsum are deposited directly in the open air without being treated, which not only occupies a large amount of land resources, but also contains soluble phosphorus, fluorine, organic matter and a small amount of harmful heavy metal chemicals such as fluorine, arsenic, and lysate, which is very harmful to the environment. . [0003] At present, there are two main ways for comprehensive utilization of phosphogypsum: one is to use it as a cement retarder; the other is to produce gypsum building materials. At present, gypsum powder produced with phosphogypsum as raw material mainly includes building gypsum and high-strength gypsum. High-strength gypsum generally refers to a-hemihydrate gypsum with a compressive strength...

Claims

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Application Information

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IPC IPC(8): C01B25/231C04B11/032C04B11/024
CPCC01B25/231C04B11/032C04B11/024
Inventor 张爱军
Owner 临沂盛丰干燥设备有限公司
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