A method for synergistic activation of multiple solid wastes based on a red mud-based fluidized solidification gelation system

By pretreatment and proportion optimization of red mud, steel slag, fly ash and desulfurized gypsum, combined with composite activators and segmented mixing process, the problems of insufficient dosage and environmental risks in red mud gelation technology have been solved, realizing a high-performance, low-risk fluidized solidification gelation system suitable for road base courses and backfilling projects.

CN122127101APending Publication Date: 2026-06-02NORTHEASTERN UNIV CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV CHINA
Filing Date
2026-03-10
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing red mud cementing technologies, insufficient red mud content leads to a sharp drop in early strength, alkali-aggregate reaction easily causes internal cracking of concrete, environmental risks remain, and excessive Na+ leaching concentration poses a risk of alkaline pollution, making it difficult to achieve a balance between high performance and environmental safety.

Method used

By pretreating the core solid waste raw materials, including the dealkali purification and heavy metal stabilization of red mud, the aging and digestion and magnetic separation of converter steel slag, the high-temperature activation of fly ash, and the adjustment of the setting time of desulfurized gypsum, and in conjunction with the optimization of the gradation of slag powder, the configuration of composite activators and the adaptation of additives, a multi-solid waste synergistic ratio and segmented mixing process are designed, and the performance of the fluidized solidification gelation system is optimized by combining the curing regime.

Benefits of technology

It achieves efficient synergistic activation of the resource utilization of red mud, steel slag, fly ash and desulfurization gypsum, improves the performance and environmental safety of fluidized solidification cementitious system, meets engineering requirements, and has high solid waste content, low environmental risk and excellent engineering performance.

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Abstract

This invention discloses a synergistic activation method for multiple solid wastes based on a red mud-based fluidized bed gelation system, belonging to the field of high-value utilization technology of industrial solid waste. The invention uses red mud, converter steel slag, fly ash, and desulfurization gypsum as core solid wastes. It achieves this by pretreating the core solid waste raw materials, optimizing the gelation of the auxiliary fluidized bed gelation system and the matching of additives, synergistic proportioning of multiple solid wastes, controlling mixing and preparation process parameters, and directionally optimizing the performance of the fluidized bed gelation system. Finally, performance verification and process adjustments are performed to prepare a fluidized bed gelation system with a 28-day compressive strength of not less than 30 MPa, a fresh slurry flowability of 120-130 mm, a freeze-thaw cycle resistance of 180-200 cycles, and a microporous density of 11%-13%. The method provided by this invention exhibits a significant synergistic activation effect, requires no special process modification, has strong process controllability, overcomes the bottleneck of single solid waste application, and demonstrates outstanding economic efficiency and applicability with a wide range of applications.
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