Functional ceramsite for efficiently purifying phosphorus-containing wastewater, preparation method and application thereof

By using functional ceramsite with natural clay minerals and functional additives to stabilize pH, the problems of increased water pH and insufficient adsorption capacity at neutral pH after the use of calcium-rich ceramsite are solved, achieving efficient phosphate removal and possessing low cost and high adsorption characteristics.

CN118344172BActive Publication Date: 2026-04-21HEBEI UNIV OF TECH +1
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Patent Information

Application Number
CN202410393623.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-02
Publication Date
2026-04-21
Estimated Expiration
2044-04-02

AI Technical Summary

Technical Problem

Existing calcium-enriched functional ceramic particles cause an increase in water pH after use, and their phosphate adsorption capacity is poor at neutral pH with limited adsorption capacity, posing a risk of secondary pollution.

Method used

Functional ceramsite was prepared by using natural clay minerals rich in Al2O3 and SiO2 as binders, combined with calcium-rich industrial solid waste and functional additives such as desulfurized gypsum and salt gypsum, through steps such as pretreatment, mixing, granulation, drying and calcination. The synergistic effect stabilized the pH value and improved the adsorption efficiency.

Benefits of technology

It achieves efficient phosphate removal under neutral pH conditions, with a removal efficiency of 82-99.5% and an adsorption capacity of 82-99.5 mg/g. It solves the problem of pH increase, extends service life and reduces costs.

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Abstract

This invention relates to a highly efficient functional ceramsite for purifying phosphorus-containing wastewater, its preparation method, and its application. Based on a complementary functional strategy, it uses natural clay rich in Al2O3 and SiO2 as a binder and calcium-rich industrial solid waste as the calcium-rich active component. Functional additives are also added to mitigate pH changes caused by calcium oxide reactions. The above raw materials are calcined at high temperature to obtain inexpensive, calcium-rich functional ceramsite with high mechanical strength, large adsorption capacity, and ecological safety. This effectively solves the common problems of increased water pH and poor phosphate adsorption capacity at neutral pH in calcium-based ceramsite, achieving highly efficient phosphorus purification in water. This invention uses inexpensive and readily available natural clay and calcium-rich industrial solid waste as raw materials, resulting in low cost, good effect, and effective application in the treatment of low-pollution water.
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