Abstract: The problem facing the plant is that the clean coarse-grained slime is high in content of entrained fine slime and moisture. To address this issue, renovation work is made on the use of the large-diameter thickening cyclone, stacked-up high-frequency vibrating screen and horizontal slime dewatering centrifuge respectively in place of the small-diameter cyclone, 3-mass high-frequency vibrating screen and vertical scraper-discharge centrifuge. Practice shows the renovation work makes it possible for the clean coarse slime to drop its ash from 9.19% to 7.96% and its moisture from 13.30% down to 9.20%—a noticeable improvement well meeting the requirements for upgrading of product and improvement of operating efficiency.