8results about "Pulp liquor regeneration" patented technology

The present invention provides a method for recovering white liquor and a white liquor separation accelerator that makes it possible to reduce the amount of white liquor contained in the lime mud after recovering the white liquor from the emulsion, thereby enabling the separation and recovery of more white liquor from the lime mud. [Solution] The method for recovering white liquor includes a white liquor treatment step of recovering white liquor by separating the lime sludge from the emulsion, which is a mixture of white liquor and lime sludge generated during the manufacture of kraft pulp, by filtration, and further includes a separation enhancement step of adding a white liquor separation enhancer, which contains at least a nonionic surfactant and promotes the separation of lime sludge and white liquor in the emulsion, to the emulsion before or during the white liquor treatment step.

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.

A foam control agent and a method of using the foam control agent to control foam for paper and pulp production, wherein the agent comprises at least a branched alcohol.

The utility model provides an environmental protection type paper production equipment of uniform stirring relates to environmental protection type paper production technical field, including pulper, one end of pulper is connected with flow box, the inner wall of flow box is opened with preliminary filter box, the inner wall of flow box is opened with deposit case, the inner wall of flow box is opened with recovery groove, the inner wall of preliminary filter box is connected with screen cloth, the inner wall fixed connection of flow box has the clamping groove, the inner wall of clamping groove is connected with filter plate, one side of flow box is connected with water pump, the outer surface fixed connection of water pump has the flow guide pipe. The utility model, the pulp will drop into the inside of deposit case through screen cloth, and the originally paper pulp inside contains a large amount of white water and will enter the inside of recovery groove through filter plate, then through water pump and inject the inside of flow guide pipe with white water, then through flow guide pipe and inject the inside of pulper with white water again, thereby realizes the recycling of water source.

This utility model discloses a papermaking white water fiber recovery device, including a main body. Water pumps are symmetrically installed on both sides of the top surface of the main body. An inlet pipe is fixedly connected to one side of each water pump, and an outlet pipe is fixedly connected to the top surface of the water pump. A fixing frame is connected through the surface of the outlet pipe and is fixedly connected to the main body. A conveying pipe is connected through the top surface of the outlet pipe, and stabilizing frames are connected through both sides of the conveying pipe. The bottom surface of the stabilizing frame is fixedly connected to the main body. Several adjustable rotating nozzles are connected through the surface of the conveying pipe. Through the cooperation of the water pumps, inlet pipe, outlet pipe, fixing frame, conveying pipe, stabilizing frame, adjustable rotating nozzles, and protective components, the frequency of filter disassembly can be reduced when the entire device is shut down for cleaning, thereby avoiding increased time costs to a certain extent.

The invention relates to new solutions for effective recovery of chemicals in a Kraft pulp mill A method for recovering chemicals in a Kraft pulp mill is provided. The method comprises producing green liquor in a recovery boiler, conveying green liquor from the recovery boiler to a green liquor stripper, stripping the green liquor with a gas stream comprising or consisting of CO2 so as to produce a stripper off-gas, feeding the stripper off-gas to a sulfuric acid plant, and producing sulfuric acid from the stripper off-gas. Further, a system as well as use of the same for recovering chemicals in a Kraft pulp mill are provided.

The application provides a pulp board machine flow conveying part temperature regulation system based on pulp waste liquid waste heat recovery, and belongs to the technical field of papermaking equipment. The system comprises: a process water-acidic wastewater heat exchange unit configured to heat process water by using the waste heat of acidic wastewater generated in a pulp workshop; a white water-black liquor heat exchange unit configured to heat white water of a pulp board machine by using the waste heat of black liquor generated in the pulp workshop; and a conveying pipeline unit connected to the process water-acidic wastewater heat exchange unit and the white water-black liquor heat exchange unit respectively. The waste heat of acidic wastewater and black liquor generated in the pulp workshop is recovered by the double-path heat exchange units to heat process water and white water, replacing the traditional steam heating mode, achieving accurate temperature regulation of the pulp board machine flow conveying part, significantly reducing steam consumption and production cost, and realizing resource utilization of waste heat energy.