Abstract: A cement grinding station adopting the "vertical mill pre-grinding + closed-circuit ball mill" process had low capacity utilization and remained in a state of shutdown and losses for a long time. Therefore, it decided to carry out transformation to switch production to high-quality fly ash. First, the operation status of the grinding system before transformation and the performance of fly ash raw materials were analyzed. On this basis, a transformation implementation path was proposed: the raw fly ash is separated by a classifier, the coarse fly ash is sent to the ball mill for grinding, and the collected dust (fine fly ash) is transported to the finished product warehouse. Furthermore, based on the theoretical analysis and calculation of the production capacity of the conveying system and grinding system, the following optimizations were made: the fly ash metering system was replaced; the gradation of the grinding media (balls) in the ball mill was optimized; P·O42.5 cement and first-grade fly ash were blended to produce masonry cement. After the transformation, the performance indicators and production efficiency of the products have been significantly improved: for the first-grade fly ash product: the specific surface area is about 400m2/kg, and the average hourly output is more than 110t/h;for the M32.5 masonry cement product: the 3d compressive strength is ≥20.8MPa, and the average hourly output is more than 120t/h. This transformation has enabled the grinding station to turn losses into profits, demonstrating the technical transformation value of "low investment and high returns".
