Abstract: To address the issues of reduced clinker strength and increased material consumption in a 6 000t/d cement production line caused by changes in raw materials and fuel, a specialized technical initiative was implemented. By strengthening quality control of raw materials and fuel, the project strictly regulated the MgO content in limestone, the alkali content in siliceous raw materials, and the stability of raw coal blending. The clinker three-ratio values were optimized to improve the burnability of raw meal. A 3.5% yellow phosphorus slag was added as a mineralizer to promote C3S formation and crystallization. Raw meal grinding aids were introduced to enhance particle size distribution and homogeneity. Precise control temperatures at the kiln inlet and outlet , tertiary air dampers, and grate cooler air supply ratios was implemented to improve calcination and cooling efficiency. Post-implementation results showed that the 3d clinker strength reached 33.4MPa (a 2.4MPa increase year-on-year), and the 28d strength reached 62.8MPa (a 3.2MPa increase year-on-year). The qualified rate of free calcium improved to 94.1%, achieving high-quality, efficient, and low-consumption operation of the kiln system. These measures also reduced corporate carbon emission pressure, providing technical support for sustainable development in the cement industry.
