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Method for treating sulfate pulping black liquor by using black liquor coal water slurry prepared from dilute black liquor

A treatment method and technology for pulping black liquor, which are applied in the regeneration of pulping liquid, regeneration of alkali liquor, and fiber raw material treatment, etc. The effect of reducing costs and eliminating pollution

Pending Publication Date: 2022-02-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the preparation of black liquor coal-water slurry mainly consists of thick black liquor preparation and black liquor as an additive preparation. The former consumes too much energy, and the latter uses a very limited amount of black liquor.

Method used

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  • Method for treating sulfate pulping black liquor by using black liquor coal water slurry prepared from dilute black liquor
  • Method for treating sulfate pulping black liquor by using black liquor coal water slurry prepared from dilute black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of coal powder: Take raw coal with a calorific value of 24.03MJ / kg, an ash content of 15%, and a volatile content of 40%, and pulverize it with a ball mill, and sieve the pulverized coal powder through a 40-mesh sieve to obtain coal pink.

[0028] Preparation of additives: the stabilizer is sodium carboxymethyl cellulose, the dispersant is sodium polynaphthalene sulfonate, add sodium carboxymethyl cellulose: sodium polynaphthalene sulfonate at a ratio of 2:3, and then fully stir.

[0029] Add additives to coal powder: Add additives according to 1% of the mass of coal powder, stir while adding, so that coal powder and additives are fully mixed.

[0030] Mix the pulverized coal with additives and black liquor: Add the pulverized coal with additives to the black liquor for stirring, the solid content of the black liquor is: 10%, the pulverized coal with additives: the mixing ratio of black liquor: 1 :0.6.

[0031] Combustion: The prepared black liquor coal-wa...

Embodiment 2

[0033] Preparation of coal powder: Take raw coal with a calorific value of 26.67MJ / Kg, an ash content of 8.25%, and a volatile content of 27.68%, and pulverize it with a ball mill, and sieve the pulverized coal powder through a 40-mesh sieve to obtain coal pink.

[0034] Preparation of additives: the stabilizer is sodium carboxymethyl cellulose, the dispersant is sodium polynaphthalene sulfonate, add sodium carboxymethyl cellulose: sodium polynaphthalene sulfonate at a ratio of 2:3, and then fully stir.

[0035] Add additives to coal powder: Add additives according to 1% of the mass of coal powder, stir while adding, so that coal powder and additives are fully mixed.

[0036] Mix the pulverized coal with additives and black liquor: Add the pulverized coal with additives to the black liquor for stirring, the solid content of the black liquor is: 12%, the pulverized coal with additives: the mixing ratio of black liquor: 1 :1.2.

[0037] Combustion: The prepared black liquor co...

Embodiment 3

[0039] Preparation of coal powder: Take raw coal with a calorific value of 35MJ / Kg, an ash content of 7%, and a volatile content of 10%, and pulverize it with a ball mill, and sieve the pulverized coal powder through a 40-mesh sieve to obtain coal powder .

[0040] Preparation of additives: the stabilizer is sodium carboxymethyl cellulose, the dispersant is sodium polynaphthalene sulfonate, add sodium carboxymethyl cellulose: sodium polynaphthalene sulfonate at a ratio of 2:3, and then fully stir.

[0041] Add additives to coal powder: Add additives according to 1% of the mass of coal powder, stir while adding, so that coal powder and additives are fully mixed.

[0042] Mix the pulverized coal with additives and black liquor: Add the pulverized coal with additives to the black liquor for stirring, the solid content of the black liquor is: 20%, the pulverized coal with additives: the mixing ratio of black liquor: 1 :1.7.

[0043] Combustion: The prepared black liquor coal-water...

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Abstract

The invention relates to a method for treating sulfate pulping black liquor by using black liquor coal water slurry prepared from dilute black liquor. The method comprises the following steps: preparing black liquor coal water slurry by taking thin black liquor generated by a paper mill as a main raw material, wherein the sulfate-process papermaking black liquor is treated by a coal water slurry process for eliminating high-load organic matter pollution in the black liquor through burning the black liquor coal water slurry; then mixing pulverized coal and an additive, mixing the mixture with papermaking black liquor with the solid content concentration of 10%-20% generated by pulping by a sulfate process according to a mixing ratio (mass ratio) of 1:0.6 to 1:1.7 to prepare the coal water slurry, and burning the black liquor coal water slurry to eliminate high-load organic matter pollution of papermaking wastewater. The method has the characteristics of low investment, high economic practicability, safety in use, energy conservation, emission reduction, simplicity and feasibility in operation and the like, and can be popularized to sulfate-process papermaking enterprises.

Description

technical field [0001] The invention belongs to the field of waste water treatment and energy consumption optimization in the papermaking industry, and in particular relates to a method for preparing black liquor coal-water slurry by using dilute black liquor to treat kraft pulping black liquor. Background technique [0002] The paper industry is one of the important traditional industries in my country, which has the characteristics of large demand for chemical raw materials, high energy consumption, large water consumption and serious pollution. In recent years, under the encouragement of policies, my country's pulp mills have been developing towards large and medium-sized ones with high speed, high efficiency, high quality, low consumption, continuous production, automation, environmental coordination, and circular economy. The direction of large-scale industry development. Papermaking black liquor (Black Liquor), papermaking black liquor is the black waste liquor produce...

Claims

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Application Information

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IPC IPC(8): D21C11/04D21C11/00C10L1/32C10L5/08
CPCD21C11/04D21C11/0085C10L1/326C10L5/08
Inventor 尹勇军杨晶晶刘江陈绍旭
Owner GUANGXI UNIV
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