System and method for preparing green cementing material by thermal coupling of metallurgical slag

Through the coupling reaction between steel slag and blast furnace slag in the thermal state, the ore phase reconstruction in metallurgical slag is realized and highly active minerals are generated, which solves the problems of low gelling activity and volume stability when steel slag is used in cement, and significantly improves the activity and stability of the gelling material.

CN119954417APending Publication Date: 2025-05-09МААНЬШАНЬ АЙРОН ЭНД СТИЛ КО ЛТД
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Patent Information

Application Number
CN202510056859.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-14
Publication Date
2025-05-09

AI Technical Summary

Technical Problem

When steel slag is used in cement, the gelling activity is relatively low, especially the early activity and the content is not high, resulting in volume stability problems. The existing technology has not effectively solved these problems.

Method used

By coupling the steel slag with blast furnace slag in a hot state and combining with a reasonable cooling system, ore phase reconstruction in the metallurgical slag is achieved, and high-active minerals such as C3S, C2S, C3A, and C4AF are generated, while reducing the f-CaO content.

Benefits of technology

The gelling activity of steel slag micro powder is significantly improved, especially the early activity, reaching or even exceeding the activity of slag micro powder, and reducing the f-CaO content, solving the problem of volume stability.

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Abstract

The invention discloses a system for preparing a green cementing material by thermal coupling of metallurgical slag. Comprising a reaction furnace for receiving the hot blast furnace slag and the hot steel slag, and a stirring device for stirring the hot slag in the reaction furnace, the cooling and granulating system is used for receiving the hot-state slag from the reaction furnace and carrying out cooling and granulating treatment on the hot-state slag; and the grinding system is used for receiving slag particles from the cooling and granulating system and carrying out grinding on the slag particles. According to the system for preparing the green cementing material through metallurgical slag thermal-state coupling, after steel slag is subjected to thermal-state coupling modification, the cementing activity of steel slag micro powder is remarkably improved, especially the early activity is greatly improved, and the S95-level performance requirement of the slag micro powder is met; the content of f-CaO in the steel slag is greatly reduced, and the problem of volume stability of a steel slag product is solved. The invention further discloses a method for preparing the green cementing material through metallurgical slag thermal-state coupling.
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