CN109279637B - Method for refining filler calcium carbonate by recovering white mud from chemical sulfate wood pulp alkali - Google Patents
Method for refining filler calcium carbonate by recovering white mud from chemical sulfate wood pulp alkali Download PDFInfo
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- CN109279637B CN109279637B CN201811104097.5A CN201811104097A CN109279637B CN 109279637 B CN109279637 B CN 109279637B CN 201811104097 A CN201811104097 A CN 201811104097A CN 109279637 B CN109279637 B CN 109279637B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/65—Chroma (C*)
Abstract
The invention comprises the process steps of material preparation, clarification, coarse screening, flocculation breaking, fine screening, carbonization, finished product storage and the like, wherein the carbonization parameters are as follows: the concentration of the white mud is more than or equal to 19 percent, and the carbonization temperature is less than 40-60 ℃; the carbonization time is more than 2 hours, the carbonization pressure is 1.0-2.0 kg/cm2, and the carbonization PH value is 7.5-10.5; fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles such as tiny coal particles, furnace ash, carbon black and the like contained in the white mud are removed by adopting rotary vibration screening, and the 275-mesh screen residue is less than 0.5%; and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank. The invention solves the technical problems of greenish color of white mud produced by causticization, low whiteness of refined calcium carbonate, unstable chemical process of a wet part of a paper machine, color difference of paper and the like in the sulfate method wood pulp pulping black liquor due to high sulfur content, and meets the requirement of high-grade cultural paper making on a high-speed paper machine.
Description
Technical Field
The invention relates to a method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali.
Background
Resource and environmental protection are two major factors restricting the development of the paper industry at present. The papermaking black liquor is the most serious pollution, the alkali recovery is the fundamental way for treating the papermaking black liquor pollution, but the secondary pollution caused by a large amount of alkaline waste residues (white mud) generated by the alkali recovery is a major problem which needs to be solved by the alkali recovery. White mud discharged from the alkali recovery causticization process of sulfate straw pulp is difficult to calcine into regenerated lime for causticization recycling due to high calcium silicate, and is generally directly buried or used for producing papermaking filler by adopting a new technology. The new process (CN200710034312.4) of refining filler calcium carbonate from white mud of Yueyang paper industry GmbH better solves the technical problem of making paper filler from alkaline straw pulp white mud. The lime mud discharged from the alkali recovery causticization process of the sulfate wood pulp is calcined into regenerated lime, and the regenerated lime is causticized and recycled, and particularly, the method is generally adopted by enterprises mainly using chemical pulp made of wood, so that the enterprises at home and abroad do not research and apply a lot on refining calcium carbonate as a filler by the alkali recovery lime mud of the sulfate wood pulp pulping, but compared with the method for preparing the refined calcium carbonate as the filler by the alkali recovery lime of the sulfate wood pulp pulping, the method has the advantages of low cost, less pollution, low energy consumption and the like.
Because the sulfate method wood pulp pulping black liquor has high sulfur content, the color of white mud produced by causticization is green, the whiteness of refined calcium carbonate is low, and a plurality of technical problems of unstable chemical process of a paper machine wet end, color difference of paper and the like are easily caused. Thus. At present, the refining filler calcium carbonate from white mud of sulfate wood pulp pulping enterprises at home and abroad is still under exploration.
In the last two years, the Yueyang forest paper limited company withdraws the grass fiber raw materials due to the adjustment of the pulping fiber raw materials, and all the grass fiber raw materials adopt wood fiber raw materials. Therefore, the refining of calcium carbonate as a filler by using chemical wood pulp alkali recovery white mud is a challenge. Through the scientific and technological challenges of scientific and technological personnel in nearly two years, the invention provides a novel technology for refining filler calcium carbonate by recovering white mud from chemical wood pulp alkali, and the novel technology well solves a plurality of technical problems of high sulfur content in the sulfate method wood pulp pulping black liquor, green color of the white mud produced by causticization, low whiteness of the refined calcium carbonate, unstable chemical process of a wet part of a paper machine, color difference of paper and the like.
Disclosure of Invention
The invention aims to solve the problems, provides a method for refining filler calcium carbonate by recovering white mud from chemical sulfate wood pulp alkali, solves the technical problems of greenish color of white mud produced by causticization, low whiteness of refined calcium carbonate, unstable chemical process of a paper machine wet part, color difference of paper and the like in sulfate wood pulp pulping black liquor due to high sulfur content, and meets the requirement of high-grade cultural paper making on a high-speed paper machine.
In order to realize the purpose, the invention adopts the technical scheme that: a method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali comprises the process steps of material preparation, clarification, coarse screening, flocculation decomposition, fine screening, carbonization, finished product storage and the like, and the specific parameters are as follows:
1) preparing materials: the temperature of the white mud is 80-85 ℃, the concentration is 23-26%, and the whiteness is more than or equal to 83% ISO;
2) clarifying and washing: after clarification, water is added for washing and residual alkali is recovered, and the pH value of the white mud is reduced;
3) coarse screening: screening by a screen mesh of 80-100 meshes, removing large-particle coarse residues by adopting equipment such as a rotary vibration screen and the like, wherein the residue of the 100-mesh screen is less than 2.5%;
4) b, uniform flocculation decomposing: the size of the particle size change of the calcium carbonate particles can be determined only by determining the adding quantity of the deflocculating medium during the homogenization deflocculation, so that the requirements of different paper machines and different paper products can be met;
5) carbonizing: the concentration of the white mud is more than or equal to 19 percent, and the carbonization temperature is less than 40-60 ℃; the carbonization time is more than 2 hours, the carbonization pressure is 1.0-2.0 kg/cm2, and the carbonization PH value is 7.5-10.5;
6) fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles such as tiny coal particles, furnace ash, carbon black and the like contained in the white mud are removed by adopting rotary vibration screening, and the 275-mesh screen residue is less than 0.5%;
7) and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank.
Preferably, the carbon source used for carbonization is flue gas obtained by washing, dedusting, desulfurizing and dewatering in an alkali furnace.
The invention has the beneficial effects that: the invention solves the technical problems of greenish color of white mud produced by causticization, low whiteness of refined calcium carbonate, unstable chemical process of a wet part of a paper machine, color difference of paper and the like in the sulfate method wood pulp pulping black liquor due to high sulfur content, and meets the requirement of high-grade cultural paper making on a high-speed paper machine.
The carbon source adopted by the carbonization is flue gas water which is obtained by washing, dedusting, desulfurizing and dewatering in the alkali furnace and then is used for adjusting the pH value of the white mud, so that the cost is reduced, the stability and the non-rebound of the pH value of the white mud are ensured, the emission of the flue gas of the alkali furnace is reduced, and the carbonization furnace is energy-saving and environment-friendly.
Detailed Description
The invention is further illustrated by the following examples.
Example 1:
a method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali comprises the process steps of material preparation, clarification, coarse screening, flocculation decomposition, fine screening, carbonization, finished product storage and the like, and the specific parameters are as follows:
1) preparing materials: the temperature of the white mud is 80-85 ℃, the concentration is 23-26%, and the whiteness is more than or equal to 83% ISO;
2) clarifying and washing: after clarification, water is added for washing and residual alkali is recovered, and the pH value of the white mud is reduced;
3) coarse screening: screening by a screen mesh of 80-100 meshes, removing large-particle coarse residues by adopting equipment such as a rotary vibration screen and the like, wherein the residue of the 100-mesh screen is less than 2.5%;
4) b, uniform flocculation decomposing: the size of the particle size change of the calcium carbonate particles can be determined only by determining the adding quantity of the deflocculating medium during the homogenization deflocculation, so that the requirements of different paper machines and different paper products can be met;
5) carbonizing: the concentration of the white mud is 21.9 percent, and the carbonization temperature is 40 ℃; the carbonization time is 2.5h, the carbonization pressure is 1.0kg/cm2, and the carbonization PH value is 7.5;
6) fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles such as tiny coal particles, furnace ash, carbon black and the like contained in the white mud are removed by adopting rotary vibration screening, and the screen residue (275 meshes) is less than 0.5%;
7) and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank.
Preferably, the carbon source used for carbonization is flue gas which is obtained by washing, dedusting, desulfurizing and dewatering in an alkali furnace.
Example 2:
a method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali comprises the process steps of material preparation, clarification, coarse screening, flocculation decomposition, fine screening, carbonization, finished product storage and the like, and the specific parameters are as follows:
1) preparing materials: the temperature of the white mud is 80-85 ℃, the concentration is 23-26%, and the whiteness is more than or equal to 83% ISO;
2) clarifying and washing: after clarification, water is added for washing and residual alkali is recovered, and the pH value of the white mud is reduced;
3) coarse screening: screening by a screen mesh of 80-100 meshes, removing large-particle coarse residues by adopting equipment such as a rotary vibration screen and the like, wherein the residue of the 100-mesh screen is less than 2.5%;
4) b, uniform flocculation decomposing: the size of the particle size change of the calcium carbonate particles can be determined only by determining the adding quantity of the deflocculating medium during the homogenization deflocculation, so that the requirements of different paper machines and different paper products can be met;
5) carbonizing: the concentration of the white mud is 22.2 percent, and the carbonization temperature is less than 45 ℃; the carbonization time is 3 hours, the carbonization pressure is 1.5kg/cm2, and the carbonization PH value is 8.5;
6) fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles such as tiny coal particles, furnace ash, carbon black and the like contained in the white mud are removed by adopting rotary vibration screening, and the screen residue (275 meshes) is less than 0.5%;
7) and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank.
Preferably, the carbon source used for carbonization is flue gas which is obtained by washing, dedusting, desulfurizing and dewatering in an alkali furnace.
Example 3:
a method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali comprises the process steps of material preparation, clarification, coarse screening, flocculation decomposition, fine screening, carbonization, finished product storage and the like, and the specific parameters are as follows:
1) preparing materials: the temperature of the white mud is 80-85 ℃, the concentration is 23-26%, and the whiteness is more than or equal to 83% ISO;
2) clarifying and washing: after clarification, water is added for washing and residual alkali is recovered, and the pH value of the white mud is reduced;
3) coarse screening: screening by a screen mesh of 80-100 meshes, removing large-particle coarse residues by adopting equipment such as a rotary vibration screen and the like, wherein the residue of the 100-mesh screen is less than 2.5%;
4) b, uniform flocculation decomposing: the size of the particle size change of the calcium carbonate particles can be determined only by determining the adding quantity of the deflocculating medium during the homogenization deflocculation, so that the requirements of different paper machines and different paper products can be met;
5) carbonizing: the concentration of the white mud is 22.5 percent, and the carbonization temperature is less than 60 ℃; the carbonization time is 4 hours, the carbonization pressure is 2.0kg/cm2, and the carbonization PH value is 10.5;
6) fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles such as tiny coal particles, furnace ash, carbon black and the like contained in the white mud are removed by adopting rotary vibration screening, and the screen residue (275 meshes) is less than 0.5%;
7) and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank.
Preferably, the carbon source used for carbonization is flue gas which is obtained by washing, dedusting, desulfurizing and dewatering in an alkali furnace.
The analysis and measurement result of the finished calcium carbonate is as follows:
it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The method for refining calcium carbonate as filler by using chemical sulfate wood pulp alkali recovery white mud provided by the invention is described in detail, the principle and the embodiment of the invention are explained in the text, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (1)
1. A method for refining calcium carbonate filler by recovering white mud from chemical sulfate wood pulp alkali comprises the process steps of material preparation, clarification, coarse screening, flocculation breaking, fine screening, carbonization and finished product storage, and is characterized in that the specific parameters are as follows:
1) preparing materials: the temperature of the white mud is 80-85 ℃, the concentration is 23-26%, and the whiteness is more than or equal to 83% ISO;
2) clarifying and washing: after clarification, water is added for washing and residual alkali is recovered, and the pH value of the white mud is reduced;
3) coarse screening: screening by a screen of 80-100 meshes, removing large-particle coarse slag by adopting rotary vibration screening equipment, wherein the residue of the 100-mesh screen is less than 2.5%;
4) b, uniform flocculation decomposing: the size of the particle size change of the calcium carbonate particles can be determined only by determining the adding quantity of the deflocculating medium during the homogenization deflocculation, so that the requirements of different paper machines and different paper products can be met;
5) carbonizing: the concentration of the white mud is more than or equal to 19 percent, and the carbonization temperature is less than 60 ℃; the carbonization time is more than 2 hours, and the carbonization pressure is 1.0-2.0 kg/cm2The pH value of carbonization is 7.5-10.5, and a carbon source used for carbonization is flue gas obtained by washing, dedusting, desulfurizing and dewatering an alkali furnace;
6) fine screening: fine screening is carried out by adopting a 200-275-mesh screen, fine colored particles of tiny coal particles, furnace dust and carbon black contained in the white mud are removed by adopting rotary vibration screening, and the 275-mesh screen residue is less than 0.5%;
7) and (4) finished product storage: the whiteness of the finished calcium carbonate is more than or equal to 88 percent ISO, and a stirrer is arranged in a finished product storage tank.
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| CN1320205C (en) * | 2004-07-27 | 2007-06-06 | 岳阳纸业股份有限公司 | Technology for mfg, high whiteness paper making filling light calcium carbonate recovered from lime mud |
| CN100441508C (en) * | 2007-01-21 | 2008-12-10 | 岳阳纸业股份有限公司 | New technique for refining filler of calcium carbonate from lime mud |
| CN103061187B (en) * | 2012-12-17 | 2014-12-03 | 陕西科技大学 | Technology of recycling white slime to refine pearl filler with sulfate process |
| CN103387253A (en) * | 2013-05-10 | 2013-11-13 | 岳阳林纸股份有限公司 | Carbonization process for white mud by using flue gas of alkali recovery boiler |
| CN106395878A (en) * | 2015-08-03 | 2017-02-15 | 海南金海浆纸业有限公司 | Method for preparing calcium carbonate filler for papermaking from wood pulp white mud and calcium carbonate filler |
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