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Process for biological treating collosol material by pulping paper making technology

A technology for pulping and papermaking and biological treatment, which is applied in the biological treatment of mechanical pulp, waste newsprint pulp and white water sol substances, and in the field of biological treatment of sol substances in the pulping and papermaking process, which can solve problems such as hazards, reduce production costs, reduce The effect of adding amount and reducing the required amount of positive charge

Inactive Publication Date: 2006-06-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention mainly aims at the current situation that newsprint mills adopt mixed pulp of deinked pulp and mechanical pulp to produce, the harm caused by colloidal substances in pulp and white water (hereinafter referred to as DCS) and the deficiency of existing treatment technology, and provides a kind of pulping A method for the biological treatment of sol substances in the papermaking process, specifically a new type of mechanical pulp, waste newsprint pulp, and DCS enzymatic treatment method in white water, to reduce the amount of cationic charge required in pulp or white water, improve the effect of cationic additives and reduce gum Sticky deposits, improved machine runnability and improved product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of waste newsprint deinking pulp:

[0029] The disintegration of waste newsprint is to add 1.0% surfactant in the pulper equipped with U.S. 8# waste newsprint and water, other conditions: NaOH 1.0%, NaOH 2 SiO 3 2.0%, H 2 o 2 1.0%, 0.1% ethylenediaminetetraacetic acid (EDTA), slurry concentration 4%-20%, temperature 30°C-75°C, pulping time 10-40min. All the above are percentages by weight.

[0030] The flotation is carried out in the flotation tank, the crushed pulp is diluted to a pulp concentration of 1%, and the ventilation rate is controlled to be 7-28m 3 / h, the pressure is 0.1-1.0MPa, flotation at room temperature for 5-30min.

[0031] Dilute the diluted pulp to a concentration of 0.2%-0.5%, and wash it through an 80-mesh copper mesh.

[0032] 2. Hydrogen peroxide bleaching

[0033] The above-mentioned washed pulp is bleached with hydrogen peroxide, and the process conditions are: pulp concentration 5%-18%, NaOH 2%, NaOH 2 SiO3 2%, MgSO ...

Embodiment 2

[0038] Enzyme treatment is carried out on the bleached chemical thermomechanical pulp (CTMP). The treatment process is: enzyme dosage 80g / ton of pulp, temperature 40°C-60°C, time 2h-6h, pH 8.0-10.0.

[0039] The mechanical pulp suspension after the enzyme treatment was centrifuged at 2000rpm for 30min, and the supernatant was DCS. Compared with the pulp DCS without enzyme treatment, the positive charge requirement was reduced by 40%. When the polyethyleneimine (PEI) addition was 2.0g / g, when the addition of cationic polyacrylamide (CPAM) is 0.4g / g, the retention rate of fine fibers is increased by 20%, and the deposition of stickies is reduced by 10%-40%.

Embodiment 3

[0041] Newsprint mills using waste newsprint deinked pulp and CTMP mixed pulp reuse white water for enzyme treatment. The treatment process is: enzyme dosage 20g / ton of water, temperature 40°C-60°C, time 2h-8h, pH 8.0-10.0.

[0042] After the enzyme treatment, the positive charge requirement of the white water is reduced by 50%, and at the same time, the deposition of stickies can be reduced by 10%-40%.

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PUM

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Abstract

The invention relates to collosol material biological treatment method in Kraft process paper technology. It belongs to Kraft process paper technique field. It includes the following steps: adding pectase into bleached mechanics pulp, crushed news paper deink pulp, or off-machine water; the use level of pectase is 20-160g / ton pulp or 1.0-40g / ton off-machine water; treatment temperature is 40-80 centigrade degree; treatment time is 1h-8h; pH value is 7.0-11.0. The invention can greatly reduce mechanics pulp and waste paper pulp DCS charge demand to reduce cation polymer adding quality or cancel, increase fiber fines keeping rate and DCS adsorption, reduce production cost and gooey, and increase paper unit working capability.

Description

(1) Technical field [0001] The invention relates to a method for biological treatment of sol substances in a pulping and papermaking process, in particular to a biological treatment technology for sol substances in mechanical pulp, waste newsprint pulp and white water, and belongs to the technical field of pulping and papermaking. (2) Background technology [0002] Lipophilic substances in wood can be dispersed in process water to form colloids with a size of 0.1-1.0um during pulping and bleaching of mechanical pulp or waste paper pulp, and these colloids are stable under certain conditions. In addition, a large amount of hemicellulose, lignan, low molecular weight lignin and pectin substances, as well as inorganic electrolytes introduced from raw materials and process water, are produced during pulping and bleaching. These substances are dissolved in in process water. The lipophilic colloidal substances dispersed in the process water or slurry water system and the non-cell...

Claims

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Application Information

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IPC IPC(8): D21H21/02D21H17/22D21H23/08D21H23/14
Inventor 秦梦华李宗全傅英娟徐清华
Owner QILU UNIV OF TECH
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