A modified phosphogypsum composite material and its preparation method and application

By mechanically activating the modified phosphogypsum composite material, combining phosphogypsum with surfactant, solving the problem of removing wastewater at high phosphorus concentration, and achieving efficient and economical wastewater treatment and recycling of phosphorus resources.

CN118767896BActive Publication Date: 2025-03-21CHINA AGRI UNIV
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Patent Information

Application Number
CN202411023639.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-29
Publication Date
2025-03-21
Estimated Expiration
2044-07-29

AI Technical Summary

Technical Problem

The prior art is difficult to effectively remove high phosphorus chemical wastewater with high phosphorus concentrations, and traditional methods have problems such as high material cost, complex process or secondary pollution.

Method used

Through mechanical activation method, phosphogypsum is mixed with quaternary ammonium salt cationic surfactant, and ion exchange and electrostatic attraction are performed, so that the hydrophilicity of the surface of phosphogypsum is turned into hydrophobicity and its adsorption ability is improved.

Benefits of technology

It has achieved efficient removal of phosphorus in wastewater with a high phosphorus concentration, with a removal rate of more than 98%, which is cheap and simple in process. The treated materials can be used for slow-release phosphorus fertilizers to realize the recycling of phosphorus resources.

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Abstract

The present invention belongs to the technical field of wastewater phosphorus removal, and provides a modified phosphogypsum composite material, a preparation method and an application thereof. The present invention comprises the following steps: after the treated phosphogypsum and a quaternary ammonium salt cationic surfactant are mixed, mechanical activation is performed to obtain the modified phosphogypsum composite material. The present invention mixes the phosphogypsum and cetyltrimethylammonium bromide, and adopts a mechanical activation method. Under the action of mechanical force, the positively charged ions of cetyltrimethylammonium bromide can not only exchange ions with inorganic cations on the surface of the phosphogypsum, but also strongly interact with the negatively charged surface of the phosphogypsum through electrostatic attraction and hydrophilic action, and change the original properties of the surface of the phosphogypsum, that is, the hydrophilicity is converted into hydrophobicity, and the phosphogypsum is combined with the surfactant, so as to realize the composite optimization of the physical surface and chemical properties of the modified material, and can efficiently purify the wastewater of the phosphorus chemical industry under high concentration.
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