(1) The coagulant must be beaten. Gypsum powder is mixed evenly with a little raw soybean milk. It must be dry and not thin. It usually takes an hour to hammer it in a mortar. It is important to mix and hammer quickly, which will slow down the swelling of gypsum and affect the solidification effect. After plastering, the gypsum should be diluted with water, and the concentration of 8% is better to remove coarse impurities. Gypsum is white and transparent fiber gypsum, and the solidified substance of soybean milk is quite scraping, elastic and strong in binding force. Other kinds of gypsum are not as effective as it.
(2) The correct rushing angle must be mastered in pulp flushing. A small amount of soybean milk and gypsum solution (referred to as slurry paste for short) for slurry flushing is washed down against the wall of the slurry container at an angle of15 ~ 35, and the slurry paste smoothly rushes down the wall to the bottom of the device, impulsive soybean milk to turn up, turn up and down, and all of them are turned over to be evenly mixed with gypsum, with good solidification effect. Part of the grout flushed at an angle less than15 will rush out of the container, the impulse will be weakened, the dosage of gypsum will be reduced, and the setting will be incomplete. Due to the reaction of the wall, the slurry injected at an angle of 40 ~ 50 degrees splashes around, and most of the slurry bounces back to the middle and upper layers of the washed soybean milk, and only a small part of the slurry rushes to the bottom, so the impulse is too small, the soybean milk can't turn up, the gypsum is unevenly mixed and sinks, and the solidification is partially incomplete and partially overdone. The bigger the angle, the worse the effect.