Method for preparing high-purity calcium sulfate through phosphogypsum recombination and purification

Through wet phase transfer, vacuum suction filtration and acid solution leaching, high-purity extraction of calcium sulfate in phosphogypsum was successfully achieved, and impurity removal problems and high energy consumption pollution in the prior art were solved, and a low-energy consumption and environmentally friendly phosphogypsum purification process was realized.

CN119747369AInactive Publication Date: 2025-04-04GUIZHOU UNIV
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Patent Information

Application Number
CN202411936489.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-04-04
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The prior art is difficult to effectively remove impurities in phosphogypsum, especially silicon separation, and traditional impurity removal methods have problems such as high energy consumption, pollution and complex processes, which limits the comprehensive utilization of phosphogypsum.

Method used

Wet phase transfer is performed by mixing phosphogypsum, sodium carbonate additive and water, and then the phase conversion residue and phase conversion liquid are separated in vacuum suction filtration, and leaching is performed in acid solution, and high-purity calcium sulfate is obtained through ionic recombination.

Benefits of technology

The high-purity extraction of calcium sulfate in phosphogypsum was achieved, and the calcium sulfate content reached 98.89%, while reducing energy consumption, simplifying the process, avoiding waste emissions, and solving the high energy consumption and pollution problems of traditional methods.

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Abstract

The invention relates to the technical field of ardealite recycling, in particular to a method for preparing high-purity calcium sulfate through ardealite recombination and purification. The method comprises the following steps: mixing ardealite, an additive and deionized water to react, enabling the ardealite to generate phase transfer, performing solid-liquid separation on ore pulp after the reaction to obtain phase transfer slag and phase transfer liquid, leaching the phase transfer slag by adopting an acid leaching method, and regulating and controlling the leachate obtained after the solid-liquid separation and the phase transfer liquid to prepare the high-purity calcium sulfate. According to the method, impurities such as silicon, aluminum and fluorine in the ardealite can be completely eliminated, so that the content of the recombined and purified high-purity calcium sulfate is as high as 98.89%, the purified gypsum calcium sulfate mainly exists in a semi-hydrated form, the recombined filtrate is a sodium chloride crude salt solution, and the method has the advantages of low energy consumption, simple process and no waste discharge, and is suitable for industrial production. The method can effectively solve the problems of high energy consumption, high pollution, complex process and the like during phosphogypsum treatment in the prior art.
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