Method for modifying tailings sand with nitrogen, phosphorus and potassium loaded biochar-vermiculite composite and application thereof

By combining biochar and vermiculite to improve tailings sand, nitrogen, phosphorus, and potassium nutrients are loaded, solving the problems of single function and easy nutrient loss of tailings improvement materials. This achieves long-term restoration and promotes vegetation growth, embodying the green restoration concept of low carbon and reduced volume.

CN122404082APending Publication Date: 2026-07-17WUHAN SURVEYING GEOTECHN RES INST OF MCC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN SURVEYING GEOTECHN RES INST OF MCC
Filing Date
2026-04-02
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing tailings improvement technologies use materials with limited functionality, making it difficult to simultaneously improve structure, water retention, fertilizer retention, and nutrient supply. Chemical fertilizers are prone to loss and have short-lived effects. When used alone, biochar or vermiculite lacks sufficient nutrient carrying capacity and slow-release regulation capabilities, making it difficult to achieve long-term stable improvement.

Method used

By constructing a porous-exchange synergistic carrier with biochar obtained from the pyrolysis of agricultural waste and vermiculite, nitrogen, phosphorus, and potassium nutrients are loaded using an impregnation and adsorption method, thereby achieving integrated improvement and fertilization of tailings sand and forming a composite improvement material.

Benefits of technology

It achieves long-term remediation of tailings sand, improves water retention capacity and nutrient utilization efficiency, promotes vegetation growth, and has the advantages of low-cost and environmentally friendly resource utilization.

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Abstract

The application provides a method for modifying tailings sand by using nitrogen, phosphorus and potassium loaded biochar-vermiculite composite and application thereof. The method mainly comprises preparation of a modification liquid, preparation of modified biochar, modification of vermiculite, and composite modification of tailings sand by using the modified biochar and the modified vermiculite. The biochar is prepared by pyrolysis carbonization of agricultural or organic waste, and the nitrogen, phosphorus and potassium nutrients are loaded in the biochar and vermiculite by impregnation or compounding. The application forms a developed pore structure and rich functional groups on the surface of the biochar by composite modification of the biochar and the vermiculite, and the vermiculite plays a good water absorption and expansion and nutrient release effect. The two are used in combination and added to the tailings substrate, which can effectively improve the water holding capacity and nutrient utilization efficiency of the substrate, improve the substrate structure condition, and promote the growth of vegetation.
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