9results about How to "Increase pulp yield" patented technology

The invention relates to the technical field of pulping, in particular to a bamboo reed raw material biological fermentation cellulose pulping method and application thereof. Bacillus licheniformis, bacillus subtilis, bacillus pumilus and bacillus cereus are compounded into a complex microbial inoculant, the fermented bamboo reed raw material is used for pulping, all strains are mutualistic and synergistic, meanwhile, a rich complex enzyme system is provided, the prepared paper is good in physical performance and high in quality, pulping is conducted through biological treatment, and the paper is environmentally friendly and environmentally friendly. The use of a large amount of chemical agents in the traditional pulping is avoided, and the discharge of wastewater in the traditional pulping process is reduced.

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.

The invention relates to the technical field of cold grinding machine tailing treatment, in particular to a fine screening tailing treatment system which is characterized in that a grinding roller is arranged in a cold grinding machine body, a liquid outlet is formed in the cold grinding machine body, an output pipe is arranged at the output end of a material pumping pump body, and a spiral press master is arranged on the surface of a material guiding frame; the cold mill has the beneficial effects that firstly, wood grinding tailings enter the cold mill body in a high-concentration manner after being extruded by the spiral press master, and then good pulp flows out through the liquid outlet to conveniently enter a papermaking finished product pool subsequently after the wood grinding tailings enter the cold mill body; unqualified tailings flow back to the cold grinding machine body through cooperation of a material pump body, a material conveying pipe and an output pipe, secondary grinding is conducted on the tailings through a grinding roller, or the output pipe is connected to the side face of a spiral press master, so that the tailings are subjected to circulating pulp grinding again, and the purposes of improving the pulp yield of wood chips and reducing the production cost are achieved; and the problem of low utilization rate of actual wood chip grinding wood pulp is also avoided.

This invention discloses a method for preparing pulp from bamboo strips, comprising the following steps: 1) adding bamboo strips to a twin-screw extruder for kneading to obtain kneaded bamboo strips; 2) adding the kneaded bamboo strips to a rotary multi-tank digester, then adding sodium hydroxide, sodium sulfate, and water for sulfate cooking, followed by washing, dewatering by extrusion, and screening with a flat sieve to obtain pulp. The method for preparing pulp from bamboo strips of this invention has advantages such as high pulp yield, low kappa number, and low reagent dosage, making it suitable for large-scale industrial application.

The present application relates to the technical field of tailings treatment of cold grinding machine, in particular to a fine screen tailings treatment system, which comprises a grinding roller arranged in the cold grinding machine body, a liquid discharge opening arranged in the cold grinding machine body, an output pipe arranged at the output end of the material pumping body, and a spiral pulp extruder arranged on the surface of the material guide frame; the beneficial effects are as follows: firstly, the wood pulp tailings are extruded by the spiral pulp extruder and then enter the cold grinding machine body, then the wood pulp tailings enter the cold grinding machine body and then flow out through the liquid discharge opening, so that the subsequent papermaking finished product pool is convenient, the unqualified tailings are returned to the cold grinding machine body through the cooperation of the material pumping body, the material conveying pipe and the output pipe, and then the tailings are secondarily ground by the grinding roller or the output pipe is connected to the side of the spiral pulp extruder to make the tailings circulate again, the purpose is to improve the wood chip pulp yield and reduce the production cost, and the problem of low utilization rate of actual wood pulp is avoided.

A kind of paper pulp mechanical pressurization preparation system, the system includes pulper, cooking device, washing device, screening device, bleaching device, concentration device, pulper, cooking device, pulp filter press, washing device, screening device, bleaching device and concentration device are sequentially connected installation, washing device is made of three to five stage washing machine, wherein still including pulp filter press;Pulp filter press is connected and installed at the rear end of cooking device or the front end of any stage washing machine in the first three stages of washing device.The system of the utility model improves the pulp yield of paper pulp pulping, wood raw material conversion rate, environmental protection and the quality and value of paper pulp.

This invention relates to the field of pulping and cooking, and discloses a pulping and cooking system, including a cooking pot, a pumping unit, and a receiving tank. The receiving tank includes a white liquor tank, a warm black liquor tank, and a hot black liquor tank. The white liquor tank contains white liquor, the warm black liquor tank contains warm black liquor, and the hot black liquor tank contains hot black liquor. The cooking pot is connected to the white liquor tank, the warm black liquor tank, and the hot black liquor tank, respectively, to reduce cooking time and increase pulp yield.

The invention provides a method for preparing chemical pulp by circulating and boiling golden bamboo grass fiber raw materials with black liquor calcified alkali liquor, belonging to the technical field of papermaking. The method comprises the following steps: adding sodium hydroxide solid particles and golden bamboo grass into a cooking pot, wherein the mass of sodium hydroxide is 20% of the mass of golden bamboo grass, adding water, wherein the mass ratio of water to the mass of golden bamboo grass is 6:1, boiling, draining to obtain softened golden bamboo grass, subjecting the crude pulp to five times of pressing and four times of pulp washing alternately to obtain chemical pulp, and post-treating the pulp, wherein the chemical pulp is subjected to pulping treatment to obtain good pulp. The invention adopts pulping waste liquor for recycling after calcification, so that 30%-32% of the alkali liquor used in the boiling of golden bamboo grass comes from the recycled alkali liquor, and 68%-70% comes from the newly added alkali liquor. The wastewater recycled after the pulping waste liquor is calcified accounts for 80%-81% of the total wastewater. The recycling and reuse of the wastewater reduces discharge, reduces the cost of conventional chemical pulp wastewater treatment, and reduces the production cost of pulping.

The invention relates to the field of pulping, and discloses a pulping system, comprising a pulping workshop, the pulping workshop comprising a cooking system, a screening system, a bleaching system and a pulp washing system, the screening system comprising a knot remover and a multi-stage fine screening system, the pulp washing system comprising a coarse screening section pulp washer, a fine screening section pulp washer, a screening pulp washer, an oxygen descaling section pulp washer, a D0 section pulp washer, an EOP section pulp washer, a D1 section pulp washer and a reflux pipe, the knot remover, the coarse screening section pulp washer, the multi-stage fine screening system, the fine screening section pulp washer and the bleaching system are connected in sequence, the filtrate outlet of the coarse screening section pulp washer is connected to the cooking system, and the filtrate outlet of the fine screening section pulp washer is connected to the multi-stage fine screening system, so as to improve the pulping rate of bamboo pulp and reduce resource waste.