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Method for extracting papermaking black liquor

A technology of papermaking black liquor and black liquor, which is applied in the field of extracting straw pulp and papermaking black liquor, can solve the problems of incomplete extraction of black liquor and sewage discharge, achieve good washing effect, reduce pollution load, and increase production

Inactive Publication Date: 2005-03-30
邓州市老廷实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of incomplete black liquor extraction and sewage discharge in the prior art

Method used

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  • Method for extracting papermaking black liquor
  • Method for extracting papermaking black liquor

Examples

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Embodiment Construction

[0018] refer to figure 1 The method for extracting papermaking black liquor of the present invention is specifically described. In this preferred embodiment, the black liquor extraction equipment is a double-screen filter press and a horizontal belt washer. Specific steps are as follows:

[0019] ① Add 68.63 tons of diluent to dilute the raw pulp with a concentration of 12% sprayed from the steaming ball to a pulp 1 with a concentration of 8-9%. Pressing out 144.39 tons of dense black liquor, 75.76 tons of which are sent to dry, 68.63 tons are returned to the original pulp for the described dilution, and the concentration of the remaining slurry is 22%;

[0020] ② Dilute the slurry 2 from the first double-net filter press to 9%, and then pump it into the second double-net filter press for extrusion filtration. The filtered first-class dilute black liquor is 131.31 tons, of which 110.45 20.86 tons of alkali return steaming balls were sent to dry;

[0021] 3. Rinse the second...

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Abstract

A process for extracting black paper-making liquor includes diluting the raw pulp from spherical digester, squeezing in the first black liquor extractor, drying part of black liquor, returning the rest back to raw pulp for diluting it, diluting the pulp slurry from the first extractor, introducing into the second extractor for extracting, flushing the extractor with clean water, returning the water back to pulp slurry for diluting it, and treating in the third extractor. Its advantages are high black liquor extracting rate up to 98.6%, and nearly no discharge of black liquor.

Description

technical field [0001] The invention relates to a method for extracting papermaking black liquor, in particular to a method for extracting straw pulp papermaking black liquor. Background technique [0002] The chemical method is used to cook herbaceous raw materials to produce raw pulp. The black liquor extraction and pulp washing process should use as little water as possible to extract as high a concentration of black liquor as possible. At the same time, the pulp should be washed clean to reduce screening. The water consumption of the workshop and the bleaching liquor consumption of the bleaching workshop. [0003] At present, the methods commonly used in the black liquor extraction section include twin-roll presses, pressure presses, single-screw presses, double-screw presses, etc., but the black liquor extraction rate of these methods generally does not exceed 80%. It brings problems such as high operating cost and difficult treatment to the middle section of water tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00
Inventor 马廷云全国林马冠
Owner 邓州市老廷实业有限公司
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