The general ball milling process of gypsum powder is to input gypsum powder into ball mill for ball milling and control its specific surface area to be 3500~4000 cm2/g. Using ball milling treatment can improve the particle morphology and grading of gypsum powder. After ball milling, the gypsum powder particles become smaller. If used as cementing material, fluidity can be increased, water consumption of standard consistency can be greatly reduced, void ratio of low hardening body can be reduced, defects can be reduced, thus the bending resistance and bending strength can be increased.
Ball milling for 60-75min has the best effect on strength modification of gypsum powder; Particle size decreases gradually with the increase of ball milling time; Ball milling for 75min has the best effect on the improvement of gypsum powder crystal form; Fluidity increases gradually with the increase of ball milling time; With the increase of ball milling time, the initial setting time of gypsum powder lengthens, the initial final setting time interval increases, the ball milling time exceeds 120min, and the hardening body.
Feed the aged clinker into the ball mill quantitatively for grinding modification, increase the specific surface area, enhance its hydration activity, and improve the phenomenon of narrow particle size distribution range, thus changing the rheological property of the slurry and improving the physical performance index. The material after grinding is the finished product, which is sent to the finished product silo for storage through conveying equipment.