CN110132787B - Method for detecting limestone powder for papermaking - Google Patents
Method for detecting limestone powder for papermaking Download PDFInfo
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- CN110132787B CN110132787B CN201910482171.5A CN201910482171A CN110132787B CN 110132787 B CN110132787 B CN 110132787B CN 201910482171 A CN201910482171 A CN 201910482171A CN 110132787 B CN110132787 B CN 110132787B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0272—Investigating particle size or size distribution with screening; with classification by filtering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0019—Means for transferring or separating particles prior to analysis, e.g. hoppers or particle conveyors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N2015/0288—Sorting the particles
Abstract
The inventor provides a method for detecting limestone powder for papermaking, which comprises the following steps: sieving with 100um sieve, sieving with 50um sieve, and sieving with 10um sieve. The technical scheme is that three sieves with different apertures of 100um, 50um and 10um are respectively adopted to sequentially carry out water sieving on the raw limestone powder, the detection method is adopted to ensure that the raw limestone powder and limestone powder are mixed with different fineness and are used as substitutes of OCC raw materials in the papermaking process, and better retaining and printing effects can be achieved.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a method for detecting limestone powder for papermaking.
Background
At present, the limestone fineness is detected by referring to a method for measuring the coal powder fineness (DL/T567.5-1995), the limestone powder particles have a large particle size and a large particle agglomeration tendency (mostly below 50 mu m), the mutual attractive force among the particles is larger than the self weight of the particles, the direct sieving measurement operation of a vibrating sieve is not facilitated, and the relative standard deviation of the detection result according to the standard is large, so that the requirement of guiding production cannot be met.
Disclosure of Invention
Therefore, a method for quickly, simply and accurately detecting the limestone powder for papermaking needs to be provided, and the limestone powder is subjected to raw material inspection. In order to achieve the above object, the inventor provides a method for detecting limestone powder for papermaking, comprising the following steps:
sieving by a 100um sieve: weighing 20.00g of limestone powder, pouring the limestone powder into a standard sieve with the aperture of 100um, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 100-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 100 um;
sieving by a 50um sieve: pouring water and limestone powder which pass through a 100-micron sieve into a standard sieve with the aperture of 50 microns, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 50-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of the residue on sieve of 50 um;
sieving by a 10um sieve: pouring water and limestone powder which pass through a 50um sieve into a standard sieve with the aperture of 10um, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; drying the stainless steel standard sieve with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculate the percent sift of 10 um.
Further, the detection result is judged as: when the oversize percentage of 100um is less than 1 percent, the oversize percentage of 50um is 5 to 15 percent and the oversize percentage of 10um is 20 to 50 percent, the limestone powder meets the requirements of paper making raw materials. Researchers find that limestone powder mixed with different fineness can achieve better retention and printing effects in the papermaking process.
Further, the detection result is judged as: when the percent of the residue on sieve is less than 0.1 percent, the percent of the residue on sieve of 50um is 9-11 percent and the percent of the residue on sieve of 10um is 28-32 percent, the limestone powder meets the requirements of paper making raw materials.
Furthermore, water splash cannot be splashed during the process of washing by tap water.
Further, the calculation formula of the percent screen residue is as follows: percent oversize (oversize/20.00 g) x 100%.
The inventor provides the limestone powder for papermaking, and the limestone powder for papermaking is detected by adopting any one of the detection methods.
Different from the prior art, the technical scheme adopts three sieves with different apertures of 100um, 50um and 10um to sequentially carry out water sieving on the limestone powder raw material, the deviation rate is lower than 5 percent, and the method is adopted to carry out limestone powder raw material detection, and is simple, rapid and accurate to operate. The detection method can ensure that the limestone powder as the raw material is limestone powder mixed with different fineness, and can achieve better retention and printing effects when being used as a substitute of OCC raw material in the papermaking process.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
In a new study of this department, it was found that good printing effect can be obtained by using limestone powder (calcium carbonate) to partially replace OCC as a component of the slurry. In further research, researchers find that the fineness of the limestone powder has a certain influence on the quality of the paper pulp. The limestone powder has small fineness and is beneficial to adsorption of papermaking fibers, but the retention rate of the limestone powder in the papermaking process is reduced, so that the waste of raw materials is caused; and if the limestone powder is large in fineness, the roughness of the paper surface is large, and the printing function of the paper surface is influenced.
Researchers find that better retaining and printing effects can be achieved by adopting limestone powder (less than 100 um) mixed with different finenesses in the papermaking process.
Example 1A limestone powder for papermaking
Sieving by a 100um sieve: weighing 20.00g of limestone powder in the same batch of limestone powder, pouring into a standard sieve with the aperture of 100um, and washing the limestone powder (without splashing in the washing process) on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 100-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 100 um;
sieving by a 50um sieve: pouring water and limestone powder which pass through a 100um sieve into a standard sieve with the aperture of 50um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 50-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of the residue on sieve of 50 um;
sieving by a 10um sieve: pouring water and limestone powder which pass through a 50um sieve into a standard sieve with the aperture of 10um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; drying the stainless steel standard sieve with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculate the percent sift of 10 um.
Percent oversize (oversize/20.00 g) x 100%.
The detection result is as follows:
the residue sieve percentage of 100um is 0.5 percent, the residue sieve percentage of 50um is 8 percent, the residue sieve percentage of 10um is 49 percent, and the limestone powder batch meets the requirements of paper making raw materials.
Example 2A limestone powder for papermaking
Sieving by a 100um sieve: weighing 20.00g of limestone powder in the same batch of limestone powder, pouring into a standard sieve with the aperture of 100um, and washing the limestone powder (without splashing in the washing process) on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 100-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 100 um;
sieving by a 50um sieve: pouring water and limestone powder which pass through a 100um sieve into a standard sieve with the aperture of 50um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 50-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of the residue on sieve of 50 um;
sieving by a 10um sieve: pouring water and limestone powder which pass through a 50um sieve into a standard sieve with the aperture of 10um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; drying the stainless steel standard sieve with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculate the percent sift of 10 um.
Percent oversize (oversize/20.00 g) x 100%.
The detection result is as follows:
the residue sieve percentage of 100um is 0.2 percent, the residue sieve percentage of 50um is 13 percent, the residue sieve percentage of 10um is 43 percent, and the limestone powder batch meets the requirements of papermaking raw materials.
Example 3A limestone powder for papermaking
Sieving by a 100um sieve: weighing 20.00g of limestone powder in the same batch of limestone powder, pouring into a standard sieve with the aperture of 100um, and washing the limestone powder (without splashing in the washing process) on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 100-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 100 um;
sieving by a 50um sieve: pouring water and limestone powder which pass through a 100um sieve into a standard sieve with the aperture of 50um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 50-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of the residue on sieve of 50 um;
sieving by a 10um sieve: pouring water and limestone powder which pass through a 50um sieve into a standard sieve with the aperture of 10um, and washing the limestone powder (water splash is not splashed in the washing process) placed on the stainless steel standard sieve with tap water until the sieved water is clear and transparent; drying the stainless steel standard sieve with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculate the percent sift of 10 um.
Percent oversize (oversize/20.00 g) x 100%.
The detection result is as follows:
the residue sieve percentage of 100um is 0.08%, the residue sieve percentage of 50um is 10%, the residue sieve percentage of 10um is 30%, and the limestone powder batch meets the requirements of papermaking raw materials.
Examples 4 to 6, 160g/m2Preparation of Kraft liner paper (limestone powder for paper making detected in examples 1-3 was used as limestone powder)
Preparing slurry by using OCC:
the OCC slurry is prepared by using waste cardboard paper as a raw material through the processes of pulping, screening and purifying, thermal dispersion and grinding disc;
in the grinding disc step, a high-concentration disc grinder is used for grinding pulp, and the beating degree of the pulp is 19-20SR after the pulp is ground by the high-concentration disc grinder. Then grinding the mixture into thick liquid by using a low-concentration disc grinder; the grinding sheet of the low-concentration disc grinder is broomed. The low-concentration disc mill is changed from the original cutting type to the brooming type, so that the fiber length is ensured to the maximum extent and the paper strength is ensured.
Under the pressure of pulp, the pulp enters the tooth slot of the inner circle part of the rotary millstone from the center of the disc grinder and makes circular motion in a reflection shape, when the pulp is blocked by a closed ring or a dam, part of the pulp is forced to pass through the gap of the rotary millstone, a pulp film is formed on the tooth surface, and simultaneously, the pulp film is subjected to the shearing action of the tooth edge and the grinding action of the tooth surface, and the fibers are also rubbed with each other. Most of pulp is driven by the rotating movable disc, enters the tooth space of the fixed disc at a high speed, is in turbulent flow type turnover flow, flows outwards along the tooth space, and then is subjected to various forces (twisting force, shearing force, friction force, kneading force and hydraulic impact force) to enable fibers to be torn, cut, crushed, twisted and broomed, so that the pulping effect is completed, and finally the pulp is discharged from a pulp outlet of the disc grinder.
Slurry preparation: preparing the OCC slurry into slurry for a surface layer, a core layer and a bottom layer;
surface layer pulp of kraft liner board paper, the American waste OCC pulp accounts for 80%, wood pulp accounts for 5%, and limestone powder accounts for 15%;
core layer pulp of kraft liner board paper, wherein the domestic waste OCC pulp accounts for 80%, the wood pulp accounts for 10%, and the American waste OCC pulp accounts for 10%;
bottom layer pulp of kraft liner board paper, the beautiful waste OCC pulp accounts for 80%, wood pulp accounts for 5%, limestone powder accounts for 15%;
manufacturing paper:
the pulp is dewatered and formed by a net part, squeezed by a squeezing part, dried by a front drying part, sized by a sizing machine, dried by a rear drying part, calendered by a calender, reeled, rewound, packed and warehoused to manufacture paper.
In the sizing process in the papermaking step, the concentration of the upper roll glue solution of the sizing machine is 10-12%, and the solubility of the lower roll glue solution is 15%.
160g/m prepared in examples 4-62The kraft liner board has improved surface ink absorption and smoothness, and thus raised surface printing performance. In example 6, the ink absorption and smoothness were further improved as compared with examples 4 and 5.
Through a large number of experiments and researches, the inventor uses the detection method to detect the limestone powder as the raw material, the method is simple and quick, the limestone powder obtained by the detection method is mixed with different fineness, and can be used as a substitute of an OCC raw material in a papermaking process, and better retention and printing effects can be achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (4)
1. A method for detecting limestone powder for papermaking is characterized by comprising the following steps:
sieving by a 100um sieve: weighing 20.00g of limestone powder, pouring the limestone powder into a standard sieve with the aperture of 100um, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 100-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 100 um;
sieving by a 50um sieve: pouring water and limestone powder which pass through a 100-micron sieve into a standard sieve with the aperture of 50 microns, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; collecting water and limestone powder which pass through a 50-micron sieve, drying a stainless steel standard sieve which is left with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of the residue on sieve of 50 um;
sieving by a 10um sieve: pouring water and limestone powder which pass through a 50um sieve into a standard sieve with the aperture of 10um, and flushing the limestone powder on the stainless steel standard sieve by using tap water until the sieved water is clear and transparent; drying the stainless steel standard sieve with the limestone powder at the temperature of 100-105 ℃, separating the limestone powder left on the standard sieve, and weighing the surplus of the limestone powder; calculating the percent of residue on sieve of 10 um;
and judging the detection result as follows: when the oversize percentage of 100um is less than 1 percent, the oversize percentage of 50um is 5 to 15 percent and the oversize percentage of 10um is 20 to 50 percent, the limestone powder meets the requirements of paper making raw materials.
2. The detection method according to claim 1, wherein the detection result is determined as: when the percent of oversize of 100um is less than 0.1 percent, the percent of oversize of 50um is 9-11 percent and the percent of oversize of 10um is 28-32 percent, the limestone powder meets the requirements of paper making raw materials.
3. The detection method according to claim 1, wherein water splash cannot be splashed during the flushing process of tap water.
4. The method of claim 1, wherein the percent rejects is calculated by: percent screen residue = (screen residue/20.00 g) × 100%.
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| CN1056166C (en) * | 1996-04-09 | 2000-09-06 | 中国制浆造纸工业研究所 | Super-fine-ground calcium carbonate for paper-making and production method thereof |
| CN1837777A (en) * | 2006-04-24 | 2006-09-27 | 中电投远达环保工程有限公司 | Method for analyzing particle diameter of limestone powder |
| CN101768378B (en) * | 2009-12-29 | 2012-11-14 | 上海东升新材料有限公司 | Method for grinding superfine heavy calcium carbonate in dry method |
| CN101851365B (en) * | 2010-06-29 | 2012-11-28 | 上海东升新材料有限公司 | Stone paper and manufacturing method thereof |
| CN102225576A (en) * | 2011-04-18 | 2011-10-26 | 贺红文 | Full-automatic stone papermaking production process |
| CN102628787A (en) * | 2012-04-06 | 2012-08-08 | 广西电网公司电力科学研究院 | Water flushing analysis method for limestone fineness for desulfurization of thermal plant |
| CN103588995B (en) * | 2013-09-22 | 2016-03-30 | 郑文彬 | Starch environment-friendlypaper paper and preparation method thereof |
| RS55981B1 (en) * | 2014-05-26 | 2017-09-29 | Omya Int Ag | Process for the preparation of crumbles comprising calcium carbonate |
| CN107603278A (en) * | 2017-08-31 | 2018-01-19 | 贺州钟山县双文碳酸钙新材料有限公司 | A kind of paper grade (stock) modified calcium carbonate and its processing technology |
| CN107574707A (en) * | 2017-09-20 | 2018-01-12 | 林龙 | A kind of preparation method of the special powdered whiting of papermaking |
| CN107724171A (en) * | 2017-09-30 | 2018-02-23 | 广西华洋矿源材料有限公司 | A kind of Nano calcium carbonate dedicated preparation method of papermaking |
| CN108286206A (en) * | 2018-04-14 | 2018-07-17 | 福建省大投科技有限公司 | Stone fiber papermaking method |
| CN108867161A (en) * | 2018-05-10 | 2018-11-23 | 桂林永福恒达实业有限公司 | A kind of preparation method of the micro mist calcium carbonate suitable for papermaking |
| CN108409169A (en) * | 2018-06-05 | 2018-08-17 | 贵州隆盛源建材有限公司 | A kind of fast energy-saving preparation method of quick lime |
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