Application of efficient penetrating agent in high-yield pulp making

A high-yield, penetrant technology, used in pulp bleaching, pretreatment with alkaline compounds, textiles and papermaking, etc. problems such as poor soaking effect, to achieve the effect of reducing pulping cost, reducing woodchip fiber loss and improving refining environment

Inactive Publication Date: 2015-12-23
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of high torque, high tearing, and high concentration of chemicals in MSD, the loss of wood chip fibers will increase; at the same time, the wear of the screw shaft, blades, screen frame, and anti-sk

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0010] Pump the high-efficiency penetrant through the metering pump to the pump inlet of the chemical mixing tank to mix with chemicals such as sodium hydroxide, sodium silicate, and chelating agent, and then pump it to the outlet of the MSD through the chemical mixing tank to mix with hydrogen peroxide After entering the macerator to react with wood chips and optimize the H 2 o 2 and NaOH dosage. Its production process is as follows: material preparation—wood chip washing—1-stage extrusion presoaking (adding 1# pre-soaking liquid)—2-stage extrusion pre-soaking (2# pre-soaking liquid adding, adding high-efficiency penetrating agent)— ——1 stage mill (addition point of bleaching liquid)——1# cyclone separator——cooling spiral——high consistency bleaching tower; the addition amount of high-efficiency penetrating agent per ton of dry pulp is 0.15-0.6kg; The chemical addition amount of 1 ton absolute dry pulp of soaking liquid is: NaOH20-40, H 2 o 2 20-35kg, Na 2 SiO 3 10-20kg, ...

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PUM

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Abstract

The invention discloses application of an efficient penetrating agent in high-yield pulp making. The application is mainly characterized in that in high-yield pulp making, the efficient penetrating agent which has alkali resistance and oxidative resistance, is easy to dissolve in water and has good emulsifying and penetrating properties is selected to accelerate penetration of pre-immersing chemical liquid and increase the treatment degree of wood chips, improve pulp grinding quality, reduce the wood chip fiber loss in pulp grinding, increase the yield of pulp grinding and improve physical strength of pulp grinding. According to the technological method, the efficient penetrating agent is pumped into an inlet of a chemical mixing tank pump through a metering pump to be mixed with sodium hydroxide, sodium silicate, chelating agents and other chemicals, the mixture is pumped to an MSD outlet expansion pup joint through the chemical mixing tank pump to be mixed with hydrogen peroxide, and then the new mixture enters an immerser to react with the wood chips. According to the quality of needed pulp, the usage amount of H2O2 and NaOH is optimized. The cost of producing the high-yield pulp is lower, the physical strength of the pulp is better, the pulp making yield is higher, and the content of COD in discharged waste water is lower.

Description

technical field [0001] The invention relates to the application of a high-efficiency penetrating agent in high-yield pulping. Background technique [0002] At present, the actual production of chemical mechanical pulp mainly relies on improving MSD torque control and increasing reaction time or increasing the amount of chemicals to increase the extrusion and tearing effect on wood chips, so that wood chips can fully absorb chemicals. However, under the conditions of high torque, high tearing, and high concentration of chemicals in MSD, the loss of wood chip fibers will increase; at the same time, the wear of the screw shaft, blades, screen frame, and anti-skid strips of MSD will be increased, and the service life will be shortened. However, if the pre-impregnation effect of wood chips is not good, the power consumption of pulping will increase and the strength of pulp will decrease. Contents of the invention [0003] The purpose of the present invention is to provide an a...

Claims

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Application Information

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IPC IPC(8): D21B1/16D21C1/06D21C9/16
Inventor 朱宏伟陈金山肖友年李望南赵靖李加华
Owner YUEYANG FOREST & PAPER CO LTD
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