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Pulping method with zero discharge of sewage

A zero-emission, pulping technology, applied in pulping of cellulose raw materials, textiles and papermaking, papermaking, etc., can solve the problems of high operating costs and large investment in alkali recovery technology, and achieve investment saving, less bleaching agent consumption, The effect of high extraction rate

Inactive Publication Date: 2015-12-23
蒋寿悟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of huge investment and high operating costs in the existing alkali recovery technology, and to provide a new technology for the treatment of black liquor and sewage in the pulping process of soda or soda zero residual alkali cooking, so that the pulping process not only has no sewage Discharge, also because black liquor is used for producing alkali lignin or lignin sulfonate, black liquor and sewage treatment have produced economic benefit, the present invention is not limited by papermaking scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In 2000kg of crushed and dedusted reeds, add 700L of sodium hydroxide solution with a temperature of 80°C and a concentration of 10%, add the catalyst under stirring, stir evenly, and then add it to the cooking pot for cooking. The cooking pressure is 0.4-0.8Mpa, the cooking time is 2 hours, the slurry concentration is controlled at 20-45%, and the mass dosage of the catalyst is 3.1%, wherein anthraquinone is 0.1%, and methanol is 3%. After cooking, the pulp first passes through three twin-screw extruders for three-stage serial countercurrent high-concentration extrusion, and the supplementary water is added by the last twin-screw extruder, and the amount of water added is 4-5m 3 / ton of pulp, the black liquor obtained by extruding the slurry from the last twin-screw extruder is returned to the second twin-screw extruder, and the black liquor obtained by the extrusion of the first and second twin-screw extruders is combined , extract black liquor, the extraction rate o...

Embodiment 2

[0033] In 2000kg of broken and dedusted cotton stalks, add 700L of sodium hydroxide solution with a temperature of 80°C and a concentration of 12%, add the catalyst under stirring, stir evenly, and then add it to the cooking pot for cooking. The cooking pressure is 0.4-0.8Mpa, the cooking time is 3 hours, the slurry concentration is controlled at 20-45%, the catalyst mass consumption is 3.15%, wherein the oxygen chlorine is 0.15%, and the methanol is 3%. After cooking, the pulp first passes through three twin-screw extruders for three-stage serial countercurrent high-concentration extrusion, and the supplementary water is added by the last twin-screw extruder, and the amount of water added is 4-5m 3 / ton of pulp, the black liquor obtained by extruding the slurry from the last twin-screw extruder is returned to the second twin-screw extruder, and the black liquor obtained by the extrusion of the first and second twin-screw extruders is combined , extract black liquor, the extr...

Embodiment 3

[0035] In 2000kg broken and dedusted poplar chips, adding temperature is 80 DEG C, concentration is 700L of cooking agent solution of 15%, adds catalyst under stirring, joins in cooking pot after stirring evenly and cooks. The cooking pressure is 0.4-0.8Mpa, the cooking time is 2 hours, the slurry concentration is controlled at 20-45%, and the mass dosage of catalyst is 4.15%, of which chlorine oxygen is 0.15%, methanol is 3%, and urea is 1%. The cooking agent is a mixture of sodium sulfite and sodium hydroxide at a ratio of 4:1. After cooking, the slurry is firstly extruded through three twin-screw extruders in series in three stages of countercurrent high-concentration extrusion, and the supplemented water is extruded by the last twin-screw extruder. Added by machine, the amount of water added is 4-5m 3 / ton of pulp, the black liquor obtained by extruding the slurry from the last twin-screw extruder is returned to the second twin-screw extruder, and the black liquor obtaine...

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Abstract

A pulping method with zero discharge of sewage comprises the steps: 1) mixing evenly a pulping raw material with a steam cooking agent and a catalyst, then adding into a spherical digester, then introducing steam, and carrying out steam cooking; 2) allowing the steam-cooked raw materials to pass through a plurality of series-connection twin-screw extruders successively, extruding and extracting black liquids, to obtain a pulp, allowing the black liquid obtained from the final twin-screw extruder to return to the former twin-screw extruder, stirring and mixing, then continuing to extrude, directly merging the black liquids obtained from the first twin-screw extruder and the second twin-screw extruder, concentrating and drying the merged black liquid to obtain alkali lignin or lignosulfonate, wherein the pulp concentration of pulp washing and pulp bleaching is 25-40%; 3) then sending the pulp into a twin-screw rubbing and kneading pulping machine, carrying out multi-section series washing while rubbing kneading and grinding, or carrying out multi-section series washing and multi-section series bleaching, allowing the washing water to return to the former-section washing process, finally obtaining washing water namely residuary washing water containing the black liquid coming from the first-section washing process, and allowing the washing water to return to the pulping raw material or the spherical digester; and 4) finally, allowing the pulp to enter a dual-disk pulp grinding machine, adding water and carrying out fine grinding.

Description

technical field [0001] The invention belongs to the technical field of papermaking and pulping, and in particular relates to a technology for making the pulping process without sewage discharge. Background technique [0002] After alkaline pulping, a large amount of fiber and non-fiber raw materials and most of the alkaline substances are dissolved in the cooking liquid to become black liquor, which is the largest pollution source in the paper industry, and the pollution load can reach 90% of the total pollution load. At present, large-scale papermaking enterprises at home and abroad mostly use traditional alkali recovery technology to treat black liquor. This technology is more effective in reducing environmental pollution caused by the paper industry. However, the one-time investment of traditional alkali recovery technology is huge, and it generally takes The investment is tens of millions of yuan, and the daily operating costs are quite high. Therefore, many small and med...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22
Inventor 蒋寿悟
Owner 蒋寿悟
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