CN101913639B - Self-retention heavy calcium carbonate and preparation method thereof - Google Patents
Self-retention heavy calcium carbonate and preparation method thereof Download PDFInfo
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- CN101913639B CN101913639B CN2010102529079A CN201010252907A CN101913639B CN 101913639 B CN101913639 B CN 101913639B CN 2010102529079 A CN2010102529079 A CN 2010102529079A CN 201010252907 A CN201010252907 A CN 201010252907A CN 101913639 B CN101913639 B CN 101913639B
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Abstract
The invention discloses self-retention heavy calcium carbonate and a preparation method thereof. Particles of the self-retention heavy calcium carbonate are in an aggregation form, the particle diameter D50 is equal to 5 to 10 microns, and D25 is more than or equal to 2.5 microns. The preparation method comprises the following steps of: (1) mixing and stirring calcite mineral powder, dispersant and water uniformly to obtain calcite mineral powder slurry; (2) delivering the mineral powder slurry obtained in the step (1) to a stirring grinder, and continuously grinding the mineral powder slurry till the average particle diameter is 1.6 to 2.4 microns; and (3) transferring the slurry obtained after grinding in the step (2) into a modifying machine filled with a modifying agent, and continuously stirring the slurry till the slurry is fully aggregated. The self-retention heavy calcium carbonate product serving as a filling agent in papermaking pulp can fully replace the filling material such as talcpowder, light calcium carbonate and the like.
Description
Technical field
The present invention relates to a kind of grinding water-ground limestone and preparation method thereof, especially relate to a kind of self-retention heavy calcium carbonate and preparation method thereof.
Background technology
Being used for the grinding water-ground limestone of paper industry as weighting agent and coating pigment in the slurry, all is to be raw material with the natural calcite at present, through crack, in small, broken bits, wet grinding is prepared from.Because its whiteness height, inexpensive has huge application potential at paper industry.But adopt the grinding water-ground limestone of existing method preparation as weighting agent in the slurry, exist keep poor, influence two large problems such as sheet bulk, for example, adopting the grinding water-ground limestone to make filler compares as filler with adopting light calcium carbonate, under the identical condition of other condition maintenance, the initial journey retention descends 5～8%, the thickness of page 2～4 μ m that on average descend, and the retention rate decline that the initial journey retention descends and causes other chemical, it consumes increase, so that the common grinding water-ground limestone still can not replace fillers such as light calcium carbonate.
Summary of the invention
The present invention aims to provide the preparation method that a kind of integral body is kept height and do not influenced the novel grinding water-ground limestone of sheet bulk.
The objective of the invention is to be achieved through the following technical solutions:
The feature of the present invention's grinding water-ground limestone product is, its particle is accumulation shape, and its particle diameter is D50=5～10 μ m, and D25 〉=2.5 μ m.
The present invention's grinding water-ground limestone preparation method may further comprise the steps:
(1) with whiteness 〉=93%ISO, fineness 〉=325 purpose calcite mineral powder, dispersion agent and water, mixing and stirring gets calcite mineral powder slurry, and the solid content of described calcite mineral powder slurry is 40wt%～70wt%;
Described dispersion agent can be sodium polyacrylate or Sodium hexametaphosphate 99, and consumption is the 0.3wt～0.8wt% of calcite mineral powder weight;
(2) mineral powder slurry that step (1) is obtained, with being pumped into mixer grinder, continuously grinding to median size is 1.6～2.4 μ m;
(3) with the slurry that obtains after step (2) grinding, be transferred in the modifying machine, put into properties-correcting agent in the modifying machine inner core, continuously stirring till assembling fully, promptly obtains from keeping the grinding heavy calcium carbonate slurry;
Described properties-correcting agent can be to be selected from a kind of in polyacrylamide, acrylamide-acrylic copolymer, the diallyl dimethyl ammoniumchloride or two kinds, and its molecular weight is 1 * 10
6～1 * 10
7, its charge species can be positively charged ion or negatively charged ion; Add-on is the 0.01wt～0.05wt% of calcite mineral powder weight.
Slurry after adopting laser size distribution instrument to modification detects, and its median size is 5～10 μ m, is 250～550% of initial size.
Keeping certainly of adopting that the inventive method prepares ground the heavy calcium carbonate slurry container of can packing into and directly is transported to the paper mill, uses as weighting agent in the papermaking slurry, replaces fillers such as talcum powder, light calcium carbonate fully.
Compared with prior art, the invention has the advantages that: 1. the form of product pellet changes, no longer is almost spherical, but is accumulation shape, and this accumulation shape can be resisted shearing force, can be held back by fibre network, thereby realize self keeping; 2. the particle diameter of product pellet and size distribution change, particle diameter after the modification is 250～550% of an initial size, and superfine small-particle at first participates in assembling, thereby size distribution is narrowed down, settling velocity reaches unanimity, and helps uniform settling on fibre network, thereby can improve the amount of filling out that adds, even the page ash improves 3～8 percentage points, can not cause dry linting yet.3. because particle is accumulation shape, the structure that can obtain to loosen after the sedimentation is improved the bulk of page, has overcome the disadvantage that present grinding water-ground limestone influences sheet bulk.4. product has no adverse effects to the page process of manufacturing paper with pulp, and also need not change the machine hand and plant condition to obtain high retention.5. technical process is simple, the fixture less investment, and manufacturing cost is lower.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
The grinding water-ground limestone product pellet of present embodiment is accumulation shape, and median size D50 is 7.2 μ m; D25 is 2.8 μ m.
Preparation: (1) joins 3.5kg sodium polyacrylate dispersion agent in the 300kg water and dilutes, and stirs down, and 700kg325 order calcite in powder is joined in the above-mentioned aqueous solution that contains sodium polyacrylate, stir, the calcite ore pulp;
(2) step (1) gained calcite ore pulp is squeezed into the continous way mixer grinder, has put into 100 kg abrasive---zirconia balls in the machine, continuously grinding to D50 be 1.8 μ m;
(3) step (2) being ground gained calcite ore pulp squeezes in the modifying machine, put into properties-correcting agent polyacrylamide solution 100kg(in the machine and wherein contained polyacrylamide 0.25 kg) and water 300kg, continuously stirring, till assembling fully, what obtain solid content and be 50wt% keeps the grinding heavy calcium carbonate slurry certainly.
Detect its particle diameter, D50 is 7.2 μ m; D25 is 2.8 μ m.
Application test: on 2640/500 paper machine, adopt 100% chemical reed pulp to produce 58g/m
2Offset paper adopts present embodiment to grind the water-ground limestone product from keeping, and adding the amount of filling out is 33% o'clock, becomes paper ash part on average to reach 29.5%, and thickness maintains 77 ± 1 μ m, and vertically fracture length maintains more than the 4.2km, and the page smooth surface does not have harsh feeling.And adopt common grinding water-ground limestone, and its D50=1.8 μ m under same condition, adds the amount of filling out and reaches at 33% o'clock, and average ash can only reach 24.2%, and thickness can only reach 73 ± 1 μ m.
Embodiment 2
The grinding water-ground limestone product pellet of present embodiment is accumulation shape, and median size D50 is 6.6 μ m; D25 is 2.6 μ m.
Preparation: (1) joins 4.5 kg Sodium hexametaphosphate 99s in the 400kg water, stirs, and until dissolving fully, 800kg325 order calcite in powder is joined in the above-mentioned aqueous solution that contains Sodium hexametaphosphate 99, stir, the calcite ore pulp;
(2) step (1) gained calcite ore pulp is squeezed into the continous way mixer grinder, has put into 120 kg abrasive---zirconia balls in the machine, continuously grinding to D50 be 2.0 μ m;
(3) the calcite ore pulp after step (2) grinding is squeezed in the modifying machine, put into properties-correcting agent diallyl dimethyl ammoniumchloride aqueous solution 150kg(in the machine and wherein contained diallyl dimethyl ammoniumchloride 0.3 kg) and water 200kg, continuously stirring is till assembling fully.What obtain solid content and be 51.5wt% keeps the grinding heavy calcium carbonate slurry certainly.
Detect its particle diameter, D50 is 6.6 μ m; D25 is 2.6 μ m.
Application test: on 2640/500 paper machine, adopt 100% chemical reed pulp to produce 58g/m
2Offset paper, the employing present embodiment is described, and adding the amount of filling out is 33% o'clock from keeping the grinding water-ground limestone, becomes paper ash part on average to reach 28.2%, and thickness maintains 78 ± 1 μ m, and vertically fracture length maintains more than the 4.1km, and the page smooth surface does not have harsh feeling.And adopt common grinding water-ground limestone, and its D50=1.8 μ m under same condition, adds the amount of filling out and reaches at 33% o'clock, and average ash can only reach 24.2%, and thickness can only reach 73 ± 1 μ m.
Embodiment 3
The grinding water-ground limestone product pellet of present embodiment is accumulation shape, and median size D50 is 7.7 μ m; D25 is 2.9 μ m.
Preparation: (1) joins 3.5 kg sodium polyacrylate dispersion agents in the 300kg water and dilutes, and stirs down, and 700kg325 order calcite in powder is joined in the above-mentioned aqueous solution that contains sodium polyacrylate, stir, the calcite ore pulp;
(2) step (1) gained calcite ore pulp is squeezed into the continous way mixer grinder, has put into 100 kg abrasive---zirconia balls in the machine, continuously grinding to D50 be 1.6 μ m;
(3) step (2) is ground gained calcite ore pulp and put into modifying machine, put into properties-correcting agent acrylamide-acrylic copolymer aqueous solution 175kg(in the machine and wherein contained acrylamide-acrylic copolymer 0.35kg) and water 300kg, continuously stirring, till assembling fully, what obtain solid content and be 47.5wt% keeps the grinding heavy calcium carbonate slurry certainly.
Detect its particle diameter, D50 is 7.7 μ m; D25 is 2.9 μ m.
Application test: on 2640/500 paper machine, adopt 100% chemical reed pulp to produce 60g/m
2Offset paper adopts present embodiment to grind the water-ground limestone product from keeping, and adding the amount of filling out is 34% o'clock, becomes paper ash part on average to reach 30.1%, and thickness maintains 78 ± 1 μ m, and vertically fracture length maintains more than the 4.0km, and the page smooth surface does not have harsh feeling.And adopt common grinding water-ground limestone, and its D50=1.8 μ m under same condition, adds the amount of filling out and reaches at 34% o'clock, and average ash can only reach 24.9%, and thickness can only reach 73 ± 1 μ m.
Claims (1)
1. a self-retention heavy calcium carbonate is characterized in that product pellet is accumulation shape, and its particle diameter is D50=5～10 μ m, and D25 〉=2.5 μ m;
The preparation method of described self-retention heavy calcium carbonate may further comprise the steps:
(1) with whiteness 〉=93%ISO, fineness 〉=325 purpose calcite mineral powder, dispersion agent and water, mixing and stirring gets calcite mineral powder slurry, and the solid content of described calcite mineral powder slurry is 40wt～70wt%;
Described dispersion agent is sodium polyacrylate or Sodium hexametaphosphate 99, and consumption is the 0.3wt～0.8wt% of calcite mineral powder weight;
(2) mineral powder slurry that step (1) is obtained, with being pumped into mixer grinder, continuously grinding to median size is 1.6～2.4 μ m;
(3) with the slurry that obtains after step (2) grinding, be transferred in the modifying machine, put into properties-correcting agent in the modifying machine inner core, continuously stirring till assembling fully, promptly obtains from keeping the grinding heavy calcium carbonate slurry;
Described properties-correcting agent is to be selected from a kind of in polyacrylamide, acrylamide-acrylic copolymer, the diallyl dimethyl ammoniumchloride or two kinds, and the molecular weight of described polyacrylamide, acrylamide-acrylic copolymer or diallyl dimethyl ammoniumchloride is 1 * 10
6～1 * 10
7The properties-correcting agent add-on is the 0.01wt%～0.05wt% of calcite mineral powder weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102529079A CN101913639B (en) | 2010-08-13 | 2010-08-13 | Self-retention heavy calcium carbonate and preparation method thereof |
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| CN2010102529079A CN101913639B (en) | 2010-08-13 | 2010-08-13 | Self-retention heavy calcium carbonate and preparation method thereof |
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Families Citing this family (6)
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| CN102351230A (en) * | 2011-07-06 | 2012-02-15 | 湖南磊鑫新材料科技有限公司 | Preparation method of ultrafine active heavy calcium carbonate |
| CN103525136A (en) * | 2013-09-17 | 2014-01-22 | 池州市大恒生化有限公司 | Preparation method of ultrafine modified ground calcium carbonate |
| CN104341798A (en) * | 2014-04-15 | 2015-02-11 | 池州市大恒生化有限公司 | Modified fine heavy calcium carbonate |
| CN104403372A (en) * | 2014-12-08 | 2015-03-11 | 广西利升石业有限公司 | Dry-process preparation method of superfine heavy calcium carbonate |
| CN104650623B (en) * | 2015-01-30 | 2017-07-28 | 苗汉陟 | A kind of modified heavy calcium carbonate and preparation method thereof |
| CN110003686A (en) * | 2019-05-06 | 2019-07-12 | 长沙理工大学 | The preparation method and application of paper grade (stock) heavy calcium carbonate filling |
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| ES2221686T3 (en) * | 1996-03-04 | 2005-01-01 | Fp-Pigments Oy | PIGMENT PARTICLES COVERED WITH PRECIPITATED CALCIUM CARBONATE AND A PROCESS FOR THE PREPARATION OF THE SAME. |
| CN101193986A (en) * | 2005-03-31 | 2008-06-04 | 英默里斯高岭土公司 | Aggregated particulate minerals, compositions comprising aggregated calcium carbonate, methods of making and uses thereof |
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