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| Retrofitting Practice of a Cement Clinker Production Line Utilizing Waste Heat for Slag Powder Production and Utilization |
| ZHOU Jie
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| Guangdong Conch Hongfeng Cement Co., Ltd. , Shaoguan Guangdong 512000, China |
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Abstract To address the issues of idle equipment, high energy consumption, and elevated costs in traditional slag powder production at a 4 500t/d cement clinker production line, this study implemented technical upgrades to the idle coal vertical mill, pneumatic conveying system, fly ash storage, and dispersion system, establishing an integrated "production-conveyance-self-use-outbound" process for S95-grade slag. The project utilized waste heat from clinker grate coolers to replace hot blast stove energy, optimized grinding pressure and baffle ring height parameters of the coal vertical mill to improve slag grindability, and improved the slag conveying and metering systems to resolve issues of excessive grinding and storage collapse causing cement mill blockages. Post-upgrade, the slag's technical specifications met S95-grade slag quality standards, achieving a 28d activity index of 102.2%. When replacing 7% of clinker with slag in cement production, the system increased hourly mill output by 18t/h, reduced power consumption by 1.4kW·h/t, and generated annual economic benefits of 5.771 5 million RMB through self-use and outbound sales, successfully realizing efficient utilization of idle resources and achieving energy-saving transformation goals.
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Received: 19 April 2025
Published: 25 January 2026
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