1results about How to "Increase pulp yield" patented technology

This invention provides a low-cost and environmentally friendly papermaking pulping process, comprising the following steps: S1. Pretreatment of papermaking fiber plant raw materials. S2. Oxy-alkali cooking: The pretreated papermaking fiber plant raw materials are mixed with an aqueous sodium carbonate solution, and cooked for 0.5–5 hours using oxygen as an oxidant. Then, sodium hydroxide is added, and cooking continues for 0.3–2 hours. Finally, the pulp and black liquor are separated by pressing. S3. Black liquor treatment: The black liquor is mixed with fiber waste, pressed, and burned as biomass fuel. S4. Recovery and causticization. This papermaking pulping process uses sodium carbonate and a small amount of sodium hydroxide for staged oxy-alkali pulping, and the generated black liquor is mixed with fiber waste and burned to recover sodium carbonate and heat, reducing the causticization rate and pulping costs.