Improved lime mud recovering process and its application for producing neutral glue blending paper

A white mud and process technology, applied in the white mud recycling process and its application in the production of neutral sizing paper, can solve the problems of light calcium carbonate not meeting the national standard quality requirements, cumbersome procedures, waste of resources, etc. Achieve significant social and environmental benefits, increase economic benefits, and reduce secondary pollution

Active Publication Date: 2004-11-17
SHANDONG BOHUI PAPER INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Publication number CN 1084413C discloses a kind of " papermaking black liquor alkali recovery green liquor causticization new process ", adopts green liquor pretreatment, and excess lime causticizes green liquor twice, according to its report, obtains recyclable caustic soda solution and Light calcium carbonate; its disadvantage is: the process is cumbersome, and only the light calcium carbonate recovered from the wood pulp method green liquor can meet the national standard quality requirements; the straw pulp method green liquor recovery light calcium carbonate can not meet the national standard quality requirements
[0005] Publication No. CN 1349861A discloses a "white mud recovery process", which is an improvement on the

Method used

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  • Improved lime mud recovering process and its application for producing neutral glue blending paper
  • Improved lime mud recovering process and its application for producing neutral glue blending paper
  • Improved lime mud recovering process and its application for producing neutral glue blending paper

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1 A kind of improved recycling lime mud process and its application in neutral sizing paper

[0043] That is to add a flocculation step in the clarification process of the original green liquor, the green liquor assists the causticizing step to the lime mud, and adds washing residual alkali and grinding and regularizing steps to the lime mud, wherein:

[0044] (1) Add milk of lime to its flocculation treatment in the original green liquor, the concentration of milk of lime is 8~10% w / w,

[0045] Its weight ratio is: former green liquid: milk of lime=30:1;

[0046] During flocculation treatment, the temperature is 90-100°C; stirring for 20-40 minutes; the treatment liquid is left to stand, and the green mud residue is separated for separate treatment;

[0047] (2) The clear green liquid that separation obtains assists causticizing to the white mud in the sedimentation tank, the white mud concentration is 30% w / w,

[0048]Its weight ratio is: white mud: clear...

Embodiment 2

[0084] Recycling white mud process

[0085] (1) Add milk of lime to its flocculation treatment in the original green liquor, the concentration of milk of lime is 8~10% w / w,

[0086] Its weight ratio is: former green liquid: milk of lime=30: 1.2;

[0087] During flocculation treatment, the temperature is 90-100°C; stirring for 20-40 minutes; the treatment liquid is left to stand, and the green mud residue is separated for separate treatment;

[0088] (2) The clear green liquid that separates obtains assists causticizing to the white mud in the sedimentation tank, and the white mud concentration is 25% w / w,

[0089] Its weight ratio is: white mud: clear green liquor = 5:1; under conventional stirring, the auxiliary causticizing temperature is 90-100°C;

[0090] (3) Wash the residual alkali in the white mud with normal water, the weight ratio of water consumption and white mud is: white mud: water=1:8;

[0091] After stirring and washing, the residual alkali content is reduced...

Embodiment 3

[0099] Recycling white mud process

[0100] (1) Add milk of lime to its flocculation treatment in the original green liquor, the concentration of milk of lime is 8~10% w / w,

[0101] Its weight ratio is: former green liquid: milk of lime=30: 1.1;

[0102] During the flocculation treatment, the temperature is 90-100°C; stirring for 30 minutes; the treatment solution is left to stand, and the green sludge is separated and treated separately;

[0103] (2) The clear green liquid that separates obtains assists causticizing to the white mud in the sedimentation tank, and the white mud concentration is 28% w / w,

[0104] Its weight ratio is: white mud: clear green liquor = 6:1; under conventional stirring, the auxiliary causticizing temperature is 90-100°C;

[0105] (3) Wash the residual alkali in the white mud with normal water, the weight ratio of water consumption and white mud is: white mud: water=1:9;

[0106] After stirring and washing, the residual alkali content is reduced t...

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Abstract

The invention is a kind of improved white clay reclaiming process and its application in neutral glue executing paper production. The original green liquid in flocculation: lime cream=30:1-1.2; they are stirred under 90-100 degrees for 20-40 minutes; when in assisting causticization, the white clay: clear green liquid =5-8:1; 90-100 degrees; rinses the residual alkali, the white clay: water =1:8-10; the white clay is grinded into particle with radius smaller than 20-30 micro meter. The density is 12-18%w/w; the white degree is 80-95%; the residual alkali is less than 0.5%; the active CaO is less than 0.5%; the pH value is from 9 to 11; the deposited volume in ten minutes is 3-10 ml/g; the dust degree is less than 0.5mm2/g; 325 items residual is less than 0.055; when filling, the absolute dry pulp: talc powder: reclaimed white clay: positie ion starch=1;0-0.2:0.15-0.4:0.015-0.02, the AKD emulsion quantity is 15-18 kg/T paper.

Description

technical field [0001] The invention belongs to the recycling and utilization of three wastes in the papermaking industry, and in particular relates to an improved lime mud recycling process and its application in the production of neutral sizing paper. Background technique [0002] In many countries in the world, the main raw material for papermaking is wood pulp. However, due to the impact of resources in my country's papermaking industry, the main raw material for papermaking is straw pulp, reed pulp, sugarcane pulp or a mixture of the above-mentioned pulp and wood pulp. Due to the influence of straw pulp raw materials, the silicon content in the by-product caustic lime mud in the waste liquid alkali recovery process is relatively high, so it is not suitable for the conventional calcination method, and the chemical method and water washing method commonly used in the industry, or because of The cost is too high and it is not suitable for the national conditions; or the qu...

Claims

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Application Information

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IPC IPC(8): B09B3/00D21C11/00
Inventor 陈商金立星
Owner SHANDONG BOHUI PAPER INDUSTRY CO LTD
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