Calcium hydroxide digestion residue is the residue left over from the lime digestion process. If not properly treated, the alkaline substances and other components in it can seep into the soil and flow into water bodies, causing soil compaction, imbalances in water pH, and serious damage to the ecological environment. Today, with the help of advanced deep processing and grinding technologies, digestion residue can be transformed into high-value-added products, such as high-quality building material additives. This effectively transforms waste into valuable resources, reduces environmental pollution, and contributes significantly to the development of a resource-conserving and environmentally friendly society.