Road modified phosphogypsum, and preparation method and application thereof

By modifying phosphogypsum with cement, a harmless modified phosphogypsum for road use is generated, which solves the problem that phosphogypsum cannot be directly applied to road base materials. This achieves a high proportion of harmless and resource-based utilization, improves the stability and durability of the material, and meets the requirements of a green circular economy.

CN120794403BActive Publication Date: 2026-04-07HUBEI JUHAI ENVIRONMENTAL TECH CO LTD
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Patent Information

Application Number
CN202511300878.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-12
Publication Date
2026-04-07
Estimated Expiration
2045-09-12

AI Technical Summary

Technical Problem

Existing technologies for using phosphogypsum as a road base material have several drawbacks, including the presence of harmful substances, the inability to dry attached water, complex pretreatment processes, and high costs. These issues prevent the large-scale harmless and resource-based utilization of phosphogypsum. Furthermore, existing methods may introduce new chemical substances, thereby damaging the properties of green and circular resources.

Method used

Phosphogypsum is treated harmlessly using cement as a single modified material. The alkaline properties of cement neutralize the free acid in the phosphogypsum and reduce the amount of attached water, while generating stable hydration products such as ettringite and hydrated calcium silicate gel, thus forming harmless modified phosphogypsum for road use. This modified phosphogypsum can then be used as a raw material for roadbed filler and ecological restoration materials.

Benefits of technology

It achieves a high proportion of harmless and resource-based utilization of phosphogypsum, meets current regulations and standards, improves the stability and durability of materials, avoids secondary environmental pollution, reduces construction complexity and cost, and maintains the attributes of a green and recyclable resource.

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Abstract

The present application relates to solid waste resource utilization technical field, provide a kind of road modified phosphogypsum and its preparation method and application, the road modified phosphogypsum is by the phosphogypsum waste of 15~40% attached water and cement A, with mass ratio 100:1~10 homogenization, aging is obtained.The present application only uses cement as modifier, realizes the harmless treatment of traditional phosphogypsum waste, while, obtains the road modified phosphogypsum of excellent performance, avoids the addition of excessive material and influences its good attribute of green recyclable resource use, simultaneously, avoids the moisture content too large when directly as roadbed material and ecological restoration material, cannot be compacted and formed and the secondary environmental pollution problem generated by the disposal of harmful substance.Furthermore, cement is used as cementing material for the preparation of composite material of the specific road modified phosphogypsum, can realize more excellent physical and mechanical properties under the condition that the utilization rate of phosphogypsum is more than 80%.
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