CN1446977A

CN1446977A - Enclosed type cycle oxygenolysis pulping method

Info

Publication number: CN1446977A
Application number: CN 02131353
Authority: CN
Inventors: 李克世; 李刚荣; 李朝旺
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-10-08
Filing date: 2002-10-08
Publication date: 2003-10-08
Anticipated expiration: 2022-10-08
Also published as: CN1188568C

Abstract

An enclosed circulating pulping method by oxygen distintegration includes kneading raw material to obtain fibre tows, softening by low-temp oxygen disintegration, adding the oxidizing-decoloring agent, grinding, bleaching, squeezing, adding the oxidizing flocculant, depositing, cyclic use of supernatant, and neutralizing the deposit. Its advantages are high output of pulp, no environmntal pollution and short period.

Description

A kind of enclosed type cycle oxygenolysis pulping method

Technical field the present invention is the pioneering invention in paper-making pulping field.

The domestic and international traditional pulp-making method of background technology is divided into chemical pulping method, half chemical semi-mechanical pulping method, all are the grass sections that raw material cut into wood chip or 2-4 centimetre, be placed on High Temperature High Pressure in the boiling vessel, strong acid and strong base boiling 4-5 hour, with low dense disc mill the slurries of 2%--12% are ground, pulp washing, need 120 tons of water, 300 degree electricity could be made one ton of slurry, and cause serious black liquor pollution, alkali reclaims and administers the water contaminated equipment if start, then need up to ten million units to drop into, strengthen cost, make the medium and small paper mill of annual return about ten million yuan not have profit even loss.In recent years at home the demonstration the explosion pulping technology, on raw material, can only be used for the paddy and wheat grass, wood pulp still fails to put into production in development, need to reach the 170-200 degree with high temperature, high pressure is more than 25 kilograms, and output is very low, the slurry beating degree is irregular, bleaching, pulp washing need a large amount of waters, and COD content reaches more than 20,000, and pollution problem still can not solve.

Summary of the invention the technology of the present invention feature is to divide silk with rubbing mill with the hands, soak into softening, high dense mill, same one-Step bleach, the slurries circulation, omnidistance oxygenation degraded COD, changed traditional chemical half chemical technology water, electricity consumption, use vapour, use alkali, time spent is many, must starch few " more than five one is few " defective, also changed continuous vapour phase (explosion) slurrying steam temperature air pressure height, COD content height, the product cost height, " three high one the is low " drawback that yields poorly, adopt atmospheric low-temperature, the method that circulation oxygen is separated makes various raw materials handle (branch silk through three times, softening, decolouring), promptly become and to make various height, in, the over dry of low-grade paper is starched in vain, reaches pollution-free, zero-emission, the treatment of wastes with processes of wastes against one another, become the useless main cleaning pulping target that is.

The specific embodiment 1, (wheatland, rice field, cotton field, forest zone etc.) are divided into fibre bundle with kneading or grinding leaser with various raw materials (rice wheat straw, bagasse, wood chip, bamboo chip, wood chip, cotton stalk, reed, waste of flax, mulberry shoot etc.) in the large tracts of land farmland, it is about 10% to remove foreign material, broken leaf and earth simultaneously, transports the fibre bundle bundling to pulp mill.

2, fibre bundle is added water one to three and immerse the reflection storehouse, be heated to the 90-100 degree and make fibre bundle softening, lignin separates, the 5-10 ton that at every turn feeds intake is advisable, send in the high concentration plate mill after 45 minutes and roughly grind, extrude lignin and black liquor with acroll press washer again, become moisture about 25% natural-color straw pulp.

3, natural-color straw pulp is delivered in the reflection storehouse, add water and add special oxidative decoloration soup, the pressurization of need not heating, the difunctional efficient fiberizer grinding of usefulness DFSP double plate, decolouring by one to one, then extrude white liquid, become the commercial white slurry moisture about 25%, that whiteness is the 75-90 degree with press master.

4, institute's extruding black liquor and to extrude white liquid importing reserves for the second time be to neutralize in 300 tons the tank for the first time, throw in (1: 20) special-purpose oxidizing, flocculating liquid of some again, the suspended matter flocculation is sunk, it is clear that slurries become, use for preimpregnation, thing such as sediment, lignin regularly takes out, and makes " biological carpet " and building materials, fuel.

Claims

1, a kind of closed circulation oxygen is separated pulping process, is the pioneering technological invention in paper-making pulping field.Its major technique feature is with kneading or grinding leaser paper making raw material to be divided into fibre bundle earlier; Make fibre bundle softening with low-temperature atmosphere-pressure, the oxygen method of separating; Add the oxidation decolorizer with high concentration plate mill and carry out defibrination, bleaching; Recycle importing after the slurries oxidation clarification of extruding to soak in storehouse and the reflection storehouse; Flocculated suspension thing post precipitation is done the neutral organic substrate that is used for " biological carpet " of handling of pH value; Slurrying overall process oxygen solution degraded COD.

2, closed circulation oxygen according to claim 1 is separated pulping process, and its principal character is with rubbing mill with the hands, dividing the silk machine paper making raw material to be made the fibre bundle of long 10-20mm, wide 1.5-2.5mm, thick 0.4-0.8mm.

3, closed circulation oxygen according to claim 1 is separated pulping process, and its principal character is that fibre bundle was added water with 1: 3, is heated to the 90-100 degree, and normal temperature, oxygenation preparation soaked into 1 hour.

4, closed circulation oxygen according to claim 1 is separated pulping process, and its principal character is with spiral propeller slurry to be delivered to add the oxidation decolorizer in the high concentration plate mill and carry out height dense (35-40%) defibrination, bleach the degree to 70-90.

5, separate pulping process according to claim 1,2,3,4 described closed circulation oxygen, its principal character is to recycle after adding the clarification of oxidation flocculant with the slurries that high dense press master is extruded.

6, separate pulping process according to claim 1,5 described closed circulation oxygen, its principal character is that flocculated suspension thing post precipitation is done the organic substrate of doing " biological carpet " after pH value neutrality is handled.

7, separate pulping process according to claim 1,2,3,4,5 described closed circulation oxygen, its principal character is all oxygenation or oxide operations in the softening storehouse, spiral propeller, high concentration plate mill, reflection storehouse in complete closed, makes the COD degraded.