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| Low-carbon Grading and Separate Grinding Process and Engineering Application Based on Cement Vertical Roller Mill |
1 CNBM Equipment Group, Hefei Zhongya Building Material Equipment Co., Ltd. Tianjin Branch, Tianjin 300133, China； 2 CNBM Equipment Group, Technology & Equipment Research Academy, Tianjin 300133, China
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Abstract The low-carbon graded separate grinding process based on cement vertical roller mills, compared to traditional mixed grinding processes, offers significant advantages including a lower clinker factor, reduced energy consumption, decreased carbon emissions, and enhanced overall cement performance. This study analyzes the mechanism of the low-carbon graded separate grinding technology, which leverages differences in the hydration activity of various raw materials. It involves grinding raw materials separately to different particle sizes before mixing them to produce the final product. The research focuses on comparative experiments of low-carbon graded separate grinding, investigates the fineness strategies for grinding raw materials with different activities (such as slag, clinker), and proposes two graded grinding process solutions: a combined grinding system ("vertical roller mill pre-grinding + ball mill grinding") and a vertical roller mill finish grinding system. Engineering practices demonstrate that the application of a low-carbon graded separate grinding system based on cement vertical roller mills can reduce clinker consumption by 10%~15% and decrease CO2 emissions by approximately 80kg/t while maintaining or even improving cement performance. This system also enables the production of ultra-fine slag powder with a specific surface area exceeding 600m2/kg, establishing it as an advanced production process promoting green and low-carbon development in the cement industry.
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Received: 29 April 2025
Published: 22 September 2025
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