CN105256652A - Method for improving whiteness of papermaking filler - Google Patents
Method for improving whiteness of papermaking filler Download PDFInfo
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- CN105256652A CN105256652A CN201510595402.5A CN201510595402A CN105256652A CN 105256652 A CN105256652 A CN 105256652A CN 201510595402 A CN201510595402 A CN 201510595402A CN 105256652 A CN105256652 A CN 105256652A
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- filler
- whiteness
- papermaking
- paper
- slurry
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Abstract
The invention provides a method for improving the whiteness of a papermaking filler. Filler slurry is treated by using chemical and physical methods so as to remove heavy metal groups and impurities in the filler slurry, so the whiteness of a filler product is improved. The method provided by the invention can eliminate influence of color development reaction of metal ions on the whiteness of paper, exerts obvious effect on improvement of the whiteness of the filler, is friendly to environment, does not increase waste water pollution load and accords with environmental protection requirements.
Description
Technical field
The present invention relates to pulp technology for making paper, be specifically related to a kind of method promoting papermaking filler whiteness.
Background technology
Along with growth in the living standard, people are being on the increase the demand of paper.The whiteness of paper is an important indicator of paper quality evaluation criterion always, affects the visual effect of paper subsequent applications, and for some special paper kinds, the whiteness of paper even affects the effect of printing, thus affects its application.The demand of existing market to cultural paper trends towards high whiteness, and whiteness requires even higher at 90%ISO ~ more than 96%ISO.
The a lot of because have of paper whiteness are affected into, comprising the whiteness of green end filler, the whiteness of long and short fiber chemical pulp, the whiteness of mechanical pulp and the application consumption etc. of joining the ratio of copying, fluorescent whitening agent in paper making process.Thus, by the improvement of applying in these, the final whiteness of sheet paper products can be promoted in paper production.Because in actual production, wet end furnish etc. cannot change, the general mode by adjustment fluorescent whitening agent and fluorescent brightening promoter reaches the higher whiteness of paper at present.High fluorescent whitening agent consumption can promote Paper White Degree, but its reinforcing yin essence electrically has a negative impact to the functional performance of other chemicals of system.Therefore, how to take a kind of more effectively better method to promote the difficult problem that Paper White Degree becomes insider.
Summary of the invention
The invention provides a kind of method of whitening of papermaking filler, by chemical method, physical method process filler slurry, remove the heavy metal group in slurries and impurity, to promote the whiteness of filler product, under the existing green end chemicals adding conditional of maintenance, filler whiteness is promoted.
For achieving the above object, technical scheme of the present invention is: a kind of method promoting papermaking filler whiteness, and described method adds reductant in filler slurries, adjustment filler slurry pH value is to alkalescence, to heat stir process, stir after adding chelating agent, then leave standstill, flotation.
Preferably, described method is in filler slurries, add the reductant that weight is filler oven dry weight 0.05% ~ 0.20%, adjust filler pH value again to 9 ~ 11, stir process at 60 DEG C ~ 90 DEG C temperature, add the chelating agent that weight is filler oven dry weight 0.1% ~ 0.4% again, then stir, leave standstill, be separated, dry, sieve.
Preferably, described papermaking filler is calcium carbonate.
Described reductant is FAS (first rice sulfinic acid).
Described chelating agent is the one of EDTA (ethylenediamine tetra-acetic acid) or DTPA (diethyl pentetic acid).
Be that pH adjusting agent regulates filler pH value with NaOH.
FAS (first rice sulfinic acid) applies wider a kind of strong reductant in the industry.FAS is a kind of excellent bleaching agent, can be used for reducing bleach; More stable to the oxygen in air, can in the dense lower bleaching of the slurry of existing device; Reduction potential is high, good stability, is particularly suitable for high temperature continuous bleaching; Environmentally friendly, do not increase contaminated wastewater load, meet environmental requirement.Under the effect of alkali, urea and sodium sulfite can be decomposed into, produce very strong reducibility.Its decomposition mechanism is:
(NH)(NH
2)CSOOH+H
2O＝(NH)(NH
2)CSOO
-+H
3O
+
(NH)(NH
2)CSOO
-+OH
-＝(NH
2)
2CO+SO
2 2-
The effect of chelating agent is: 1. to Fe
3+ion has extremely strong capturing ability and dispersion effect, avoids Fe
3+phenol radical reaction in ion and paper pulp forms dark colour compound, and protection fiber, improves pulp brightness, reduces yellowing reversion of pulp; 2. effectively can stop the metal ion such as calcium, magnesium that chemical reaction occurs in pulp bleaching process and form sediment, thus prevent system equipment, pipeline scale, and progressively can remove the original fouling of rinse-system; 3. there is certain dispersibility, the dispersiveness of sodium metasilicate can be improved.
FAS (first rice sulfinic acid) is decomposed into the sulphoxylic acid radical ion (SO with strong reducing property under the condition of meta-alkalescence
2 2-), react with ferric ion in pearl filler slurries, ferrous ion iron ion being reduced into do not develop the color.But metal ion is still in filler slurries, then ferrous ion forms chelate under the chelation of chelating agent, through screening separating treatment pearl filler slurries, chelate is separated by calcium carbonate serosity, thus the impact that the chromogenic reaction eliminating iron ion causes Paper White Degree.
As the raw material such as calcium carbonate, talcum powder, china clay of papermaking filler, the principal element affecting its whiteness has the material of heavy metal ion and compound and other organics, the present invention to adopt the content of heavy metal in elimination or reduction filler and impurity to be methods effectively promoting filler whiteness.Result of the present invention batch testing on Laboratory Evaluation and machine shows, is lifted at 2%ISO ~ 3%ISO to filler level calcium carbonate whiteness.
The impact that the chromogenic reaction that the present invention can eliminate metal ion causes Paper White Degree, obvious to the castering action of filler whiteness, and environmentally friendly, do not increase contaminated wastewater load, meet environmental requirement.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read content of the present invention, these equivalent form of values fall within limited range of the present invention equally.
Embodiment 1
(1) bleaching calcium carbonate slurry is used to be fill out with calcium carbonate in 60 grades;
(2) add FAS consumption 0.6kg/t (to calcium carbonate over dry), adding NaOH consumption is FAS: NaOH=2: 1;
(3) to add after solution carry out 300rpm, 2 hours stirring, temperature 60 C reaction treatment;
(4) add 2.0kg/tEDTA, concentration of slurry 40% ~ 70%, carry out 300rpm, 10min and stir; To bleaching, chelating rear slurry leaves standstill, flotation process.
Embodiment 2
(1) bleaching calcium carbonate slurry is used to be fill out with calcium carbonate in 60 grades;
(2) add FAS consumption 1.2kg/t (to calcium carbonate over dry), adding NaOH consumption is FAS: NaOH=2: 1;
(3) to add after solution carry out 300rpm, 2 hours stirring, temperature 60 C reaction treatment;
(4) add 3.0kg/tEDTA, carry out 300rpm, 10min and stir; To bleaching, chelating rear slurry leaves standstill, flotation process.
Embodiment 3,
(1) bleaching calcium carbonate slurry is used to be fill out with calcium carbonate in 60 grades;
(2) add FAS consumption 1.8kg/t (to calcium carbonate over dry), adding NaOH consumption is FAS: NaOH=2: 1;
(3) to add after solution carry out 300rpm, 2 hours stirring, temperature 60 C reaction treatment;
(4) add 4.0kg/tDTPA, carry out 300rpm, 10min and stir; To bleaching, chelating rear slurry leaves standstill, flotation process.
With the filler of embodiment 1 ~ 3 for raw material, room is assessed and batch testing on machine by experiment, 2%ISO ~ 3%ISO is lifted to filler level calcium carbonate whiteness, reduce the consumption that paper brightens fluorescent whitening agent, the paper of 96%ISO whiteness of manufacturing paper with pulp, the consumption of total fluorescer reduces 2-3kg/t paper, become this section to fall to chemicals and green end system enhancement etc. all obvious.
Therefore, the impact that the chromogenic reaction that the present invention can eliminate metal ion causes Paper White Degree, obvious to the castering action of filler whiteness, and environmentally friendly, do not increase contaminated wastewater load, meet environmental requirement.
Be more than the description to the embodiment of the present invention, by the above-mentioned explanation to the disclosed embodiments, professional and technical personnel in the field realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. promote a method for papermaking filler whiteness, it is characterized in that, described method adds reductant in filler slurries, and adjustment filler slurry pH value is to alkalescence, and stir process of heating, stirs after adding chelating agent, standing, flotation.
2. the method promoting papermaking filler whiteness as claimed in claim 1, it is characterized in that, described method is in filler slurries, add the reductant that weight is filler oven dry weight 0.05% ~ 0.20%, adjust filler slurry pH value again to 9 ~ 11, stir process at 60 DEG C ~ 90 DEG C temperature, add the chelating agent that weight is filler oven dry weight 0.1% ~ 0.3% again, then stir, leave standstill, be separated, dry, sieve.
3. the method promoting papermaking filler whiteness as claimed in claim 1 or 2, it is characterized in that, described papermaking filler is calcium carbonate.
4. the method promoting papermaking filler whiteness as claimed in claim 1 or 2, it is characterized in that, described reductant is FAS.
5. the method promoting papermaking filler whiteness as claimed in claim 1 or 2, it is characterized in that, described chelating agent is the one of EDTA or DTPA.
6. the method promoting papermaking filler whiteness as claimed in claim 1 or 2, it is characterized in that, be that pH adjusting agent regulates filler pH value with NaOH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510595402.5A CN105256652A (en) | 2015-09-18 | 2015-09-18 | Method for improving whiteness of papermaking filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510595402.5A CN105256652A (en) | 2015-09-18 | 2015-09-18 | Method for improving whiteness of papermaking filler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105256652A true CN105256652A (en) | 2016-01-20 |
Family
ID=55096568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510595402.5A Pending CN105256652A (en) | 2015-09-18 | 2015-09-18 | Method for improving whiteness of papermaking filler |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103821A (en) * | 1985-05-13 | 1986-11-12 | 陈学廉 | Increase the method for whiteness of low density calcium carbonate |
| US4824653A (en) * | 1988-09-29 | 1989-04-25 | Franklin Industries, Inc. | Method of bleaching limestone |
| CN1170394A (en) * | 1994-11-21 | 1998-01-14 | 矿业技术有限公司 | Method for purification of calcium carbonate |
| CN1544535A (en) * | 2003-11-11 | 2004-11-10 | 赵路军 | Method for purifying and whitening calcium carbonate |
| CN102502749A (en) * | 2011-10-20 | 2012-06-20 | 福建省万旗非金属材料有限公司 | Method for preparing rose calcium carbonate from low-grade limestone |
| CN103215849A (en) * | 2013-04-28 | 2013-07-24 | 陕西科技大学 | Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali |
-
2015
- 2015-09-18 CN CN201510595402.5A patent/CN105256652A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103821A (en) * | 1985-05-13 | 1986-11-12 | 陈学廉 | Increase the method for whiteness of low density calcium carbonate |
| US4824653A (en) * | 1988-09-29 | 1989-04-25 | Franklin Industries, Inc. | Method of bleaching limestone |
| CN1170394A (en) * | 1994-11-21 | 1998-01-14 | 矿业技术有限公司 | Method for purification of calcium carbonate |
| CN1544535A (en) * | 2003-11-11 | 2004-11-10 | 赵路军 | Method for purifying and whitening calcium carbonate |
| CN102502749A (en) * | 2011-10-20 | 2012-06-20 | 福建省万旗非金属材料有限公司 | Method for preparing rose calcium carbonate from low-grade limestone |
| CN103215849A (en) * | 2013-04-28 | 2013-07-24 | 陕西科技大学 | Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160120 |