Method for producing calcium sulfoaluminate modified silicate clinker by sulfur fixation

CN122380685APending Publication Date: 2026-07-14SOUTHEAST UNIV

View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: SOUTHEAST UNIV
Filing Date: 2026-05-13
Publication Date: 2026-07-14

AI Technical Summary

Technical Problem

In existing technologies, endogenous sulfur is difficult to fix, SO2 emissions are easily volatilized in the preheating section, preheater scaling and blockage occur, calcium sulfoaluminate and C3S temperature zones are mismatched and difficult to co-fire in one step, high-alkali and low-grade limestone has low utilization rate, sulfur-containing solid waste is difficult to co-dispose of, and clinker strength and energy consumption do not meet standards.

Method used

By employing methods such as raw material compatibility, joint grinding, rate control, composite mineralization, and alkali-mediated sulfur locking-release staged calcination, sulfur is fixed in a specific direction and utilized for resource recovery. This process produces calcium sulfoaluminate modified silicate clinker, which involves the compatibility of high-alkali, low-grade limestone with silicon-aluminum-iron corrective raw materials and sulfur-containing solid waste, joint grinding and activation, precise control of the raw material B rate, and staged temperature-controlled calcination to generate calcium sulfoaluminate minerals that are co-fired with C3S.

Benefits of technology

It achieves efficient fixation of endogenous sulfur, reduces SO2 emissions, simplifies the process and reduces costs, improves clinker strength, increases the utilization rate of low-grade limestone, stably disposes of various solid wastes, reduces calcination energy consumption, and meets the requirements of low-carbon and green production.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN122380685A_ABST

Patent Text Reader

Abstract

This invention discloses a method for preparing calcium sulfoaluminate modified silicate clinker through sulfur fixation. Utilizing a dual mechanism of low-temperature sulfur locking with alkali metals and high-temperature sulfur release through composite mineralization, the method directionally fixes and transforms endogenous sulfur from sulfur-containing limestone, high-sulfur coal, and sulfur-containing solid waste into calcium sulfoaluminate minerals, achieving co-firing with C3S in a single step. This solves industry problems such as sulfur volatilization in the preheating stage, high SO2 emissions, and the difficulty of coexisting sulfur with silicate mineral phases. Through integrated processes of raw material matching, efficient grinding, composite mineralization, precise rate control, and segmented calcination, the method achieves a sulfur fixation rate ≥92%, a clinker 28-day compressive strength ≥60.7 MPa, a calcination temperature reduction of 30-60℃, a standard coal consumption reduction of 6%-12%, and a comprehensive environmental load reduction of 14.4%. It can handle large-scale applications of alkali-containing or high-alkali low-grade limestone, high-sulfur coal, as well as solid waste such as phosphorus slag, red mud, and engineering waste. It is compatible with new dry-process cement production lines, reducing enterprise desulfurization costs, fully utilizing mineral resources, and demonstrating significant environmental and economic benefits.

Need to check novelty before this filing date? Find Prior Art