CN110424179B - Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler - Google Patents
Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler Download PDFInfo
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- CN110424179B CN110424179B CN201910791049.6A CN201910791049A CN110424179B CN 110424179 B CN110424179 B CN 110424179B CN 201910791049 A CN201910791049 A CN 201910791049A CN 110424179 B CN110424179 B CN 110424179B
- Authority
- CN
- China
- Prior art keywords
- papermaking
- sludge
- calcium hydroxide
- filler
- ash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000010802 sludge Substances 0.000 title claims abstract description 98
- 239000000945 filler Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002910 solid waste Substances 0.000 title claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 36
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 31
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 31
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 18
- 238000003763 carbonization Methods 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000004537 pulping Methods 0.000 claims abstract description 9
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 8
- 239000002761 deinking Substances 0.000 claims abstract description 7
- 239000010840 domestic wastewater Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000006011 modification reaction Methods 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 230000004048 modification Effects 0.000 abstract description 9
- 238000012986 modification Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 6
- 238000011049 filling Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 7
- 230000008901 benefit Effects 0.000 description 7
- 239000000376 reactant Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000012764 mineral filler Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- 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
- D21H17/01—Waste products, e.g. sludge
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler. The papermaking sludge mainly comprises the following types: deinking sludge, sludge produced in the pulping and papermaking process, sludge produced in the pulping and papermaking wastewater treatment, sludge produced in the domestic wastewater treatment and the like. The preparation process comprises the following steps: firstly, burning one or more kinds of paper making sludge to obtain paper making sludge ash; and stirring and mixing the papermaking sludge ash and calcium hydroxide, and then introducing mixed gas of carbon dioxide and air for carbonization modification to obtain the composite papermaking filler. The composite papermaking filler prepared by the invention not only meets the filling performance of paper, but also realizes high-valued resource utilization of the solid waste sludge.
Description
Technical Field
The invention relates to the field of pulping and papermaking, in particular to a method for modifying solid waste after incineration of papermaking sludge to be used as a papermaking filler.
Background
The paper making industry is an important industry in China, the discharge amount of paper making sludge in China is the first in the world, the discharge amount is about more than 2000 ten thousand tons every year, and most paper mills mainly treat the paper making sludge in modes of landfill, fluidized bed high-temperature incineration and the like. The land is filled in a large amount, which causes waste of land resources. Moreover, as the national environmental requirements have been increased over the years, large-scale paper mills generally require fluidized bed treatment, and the amount of incineration sludge produced thereby has been increasing year by year. Therefore, the reasonable recycling of the papermaking byproducts not only is an environmental protection problem urgently needed to be solved by the current society, but also meets the requirement of China on the construction of 'waste-free cities'.
Sludge ash generated after the incineration of the papermaking sludge has similar physical and chemical properties with some papermaking fillers. In addition, the sludge ash is rough and porous in surface, and is beneficial to the retention of fillers among papermaking fibers.
In 2017, the total yield of paper and paperboard in China is 12542 million tons, about 4000 million tons of inorganic mineral fillers are required on average to meet the production requirement, even if 30 percent of inorganic mineral fillers are replaced, about 1200 million tons of sludge ash composite paper making fillers can be consumed in the paper making industry every year in China, the cost of each ton of composite fillers can be saved by 600 yuan, and the total cost is 72 million yuan per year.
Therefore, the method for carbonizing and modifying the papermaking sludge ash realizes that the papermaking sludge ash is used as a papermaking filler, has great significance for continuously promoting modification of solid waste, reducing landfill amount to the maximum extent, realizing high-value utilization of industrial solid waste of the papermaking sludge ash, reducing papermaking cost and the like, and has good environmental benefit, social benefit and economic benefit.
Disclosure of Invention
The invention aims to provide a preparation method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler, thereby solving the problems of serious waste of land resources and environmental pollution caused by the accumulation of a large amount of papermaking sludge ash, and simultaneously providing a feasible technical process for the resource high-value utilization of the papermaking sludge.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler comprises the following steps:
(1) burning the papermaking sludge to obtain papermaking sludge ash;
(2) mixing the papermaking sludge ash obtained in the step (1) with calcium hydroxide solids, then adding water, fully stirring and mixing, and finally introducing mixed gas of carbon dioxide and air to perform carbonization modification reaction to obtain the composite papermaking filler.
In the method, the papermaking sludge comprises deinking sludge, sludge produced in the pulping and papermaking process, sludge produced in the pulping and papermaking wastewater treatment and sludge produced in the domestic wastewater treatment.
In the method, the incineration temperature is 600-.
In the method, the calcium hydroxide accounts for 1.0-20.0% of the total mass of the papermaking sludge ash, the calcium hydroxide and the water.
In the method, the flow rate of the carbon dioxide is 0.10-1.00L/min.
In the method, the ratio of the carbon dioxide to the air flow rate is 1: 1-4.
In the method, the stirring speed of the carbonization modification reaction is 400-1200 r/min.
In the method, the calcium hydroxide is purchased or prepared from calcium oxide and water.
In the method, the mass ratio of the papermaking sludge to the calcium hydroxide is 1: 1 to 5.
The invention provides a preparation method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler, which comprises the following steps: burning the papermaking sludge to obtain papermaking sludge ash: and stirring and mixing the papermaking sludge ash and calcium hydroxide, and introducing mixed gas of carbon dioxide and air for carbonization modification to obtain the composite papermaking filler. The invention removes organic substances such as fiber in sludge by means of incineration.
The papermaking sludge provided by the invention comprises deinking sludge, sludge produced in the pulping and papermaking process, sludge produced in the pulping and papermaking wastewater treatment, sludge produced in the domestic wastewater treatment and the like. After being incinerated, the sludge has a physical structure and chemical components similar to the properties of some common papermaking fillers. In addition, the surface of the paper sludge is rough and porous due to the removal of some organic substances, and the paper sludge is easy to remain among fibers.
Compared with the prior art, the invention has the advantages that:
according to the invention, the papermaking sludge ash and the calcium hydroxide are stirred and mixed, and the mixed gas of the carbon dioxide and the air is introduced for carbonization modification, so that on one hand, the whitening of the papermaking sludge ash is realized by crystallizing the calcium carbonate on the surface of the sludge ash, and on the other hand, the carbon dioxide can be directly sourced from flue gas as a raw material, so that the reaction process is simple, and the industrial scale and equipment requirements are not high. Meanwhile, precipitated calcium carbonate is also one of several fillers commonly used in papermaking. The composite filler prepared by the invention is applied to papermaking, not only provides a technical route for high-value resource utilization for papermaking sludge ash, but also creates great economic benefit, environmental benefit and social benefit for papermaking enterprises.
Detailed Description
The invention provides a preparation method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler, which comprises the following steps:
burning the papermaking sludge to obtain papermaking sludge ash;
and stirring and mixing the papermaking sludge ash and calcium hydroxide, and introducing mixed gas of carbon dioxide and air for carbonization modification to obtain the composite papermaking filler.
The invention obtains the papermaking sludge ash after burning the papermaking sludge. In the present invention, the incineration temperature is preferably 800-1200 ℃, more effectively 900-1000 ℃, and the incineration time is preferably 1.5-6.5h, more preferably 2.0-3.0 h.
After the papermaking sludge ash is obtained, the papermaking sludge ash and calcium hydroxide are stirred and mixed, and carbon dioxide is introduced for carbonization modification, so that the composite papermaking filler is obtained. In the present invention, the mass concentration of the calcium hydroxide is preferably 1.0% to 20.0%, more preferably 7.0% to 15.0%. In the present invention, the flow rate of the carbon dioxide is preferably 0.10 to 1.00L/min, more preferably 0.20 to 0.80L/min. In the present invention, the ratio of the carbon dioxide to the air flow rate is 1: 1-4, more preferably 1: 2-3. In the invention, the stirring speed of the carbonization reaction is preferably 400-1200r/min, and more preferably 600-800 r/min. In the invention, the calcium hydroxide is purchased or prepared by calcium oxide and water. In the present invention, the mass ratio of the paper sludge to the calcium hydroxide is preferably in the range of 1: 1-5, more preferably 1: 1-3.
The following will describe in detail the preparation method of the present invention for modifying solid waste after incineration of paper sludge for use as filler in paper making with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Burning 20g of paper-making deinking sludge at 1000 ℃ for 2.5h to obtain paper-making sludge ash; cooling, and mixing the papermaking sludge ash and calcium hydroxide according to the weight ratio of 1: 1, stirring and mixing uniformly, then continuously adding water, stirring the powder simultaneously, fully stirring and mixing, wherein the reactant calcium hydroxide accounts for 7 percent of the total mass of the papermaking sludge ash, the calcium hydroxide and the water, the stirring speed is 600r/min, then mixing 0.20L/min carbon dioxide and 0.80L/min air, introducing the mixture into a carbonization reaction device, and stopping the reaction after prolonging for 20min when the pH is reduced to 7. The whiteness of the sludge ash is improved from 70.12 percent ISO to 79.12 percent ISO through detection, and the particle size is in the particle size range of common papermaking fillers.
Example 2
Burning 20g of paper-making deinking sludge at 1000 ℃ for 2.5h to obtain paper-making sludge ash; cooling, and mixing the papermaking sludge ash and calcium hydroxide according to the mass concentration of 1: 3, stirring and mixing uniformly, then continuously adding water, stirring the powder simultaneously, fully stirring and mixing, wherein the mass of a reactant calcium hydroxide accounts for 7% of the total mass of the papermaking sludge ash, the calcium hydroxide and the water, the stirring speed is 600r/min, then mixing 0.20L/min carbon dioxide and 0.80L/min air, introducing the mixture into a carbonization reaction device, and stopping the reaction after prolonging for 20min when the pH is reduced to 7. The detected whiteness of the sludge ash is improved from 70.28 percent ISO to 80.99 percent ISO, and the particle size is in the particle size range of common papermaking fillers.
Example 3
Burning 20g of paper-making deinking sludge at 1000 ℃ for 2.5h to obtain paper-making sludge ash; cooling, and mixing the papermaking sludge ash and calcium hydroxide according to the weight ratio of 1: 3, stirring and mixing uniformly, then continuously adding water, stirring the powder simultaneously, fully stirring and mixing, wherein the mass of a reactant calcium hydroxide accounts for 15 percent of the total mass of the papermaking sludge ash, the calcium hydroxide and the water, the stirring speed is 600r/min, then mixing 0.20L/min carbon dioxide and 0.80L/min air, introducing the mixture into a carbonization reaction device, and stopping the reaction after prolonging for 20min when the pH is reduced to 7. The whiteness of the sludge ash is improved from 70.18% ISO to 81.93% ISO through detection, and the particle size is in the particle size range of common papermaking fillers.
From the above embodiment, the invention provides a preparation method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler, which comprises the following steps: burning the papermaking sludge to obtain papermaking sludge ash; and stirring and mixing the papermaking sludge ash and calcium hydroxide, and introducing carbon dioxide for carbonization modification to obtain the composite papermaking filler. The data show that the method can realize that the incinerated papermaking sludge ash can be successfully used as the papermaking filler, the whiteness of the composite papermaking filler is improved along with the increase of the proportion of the calcium hydroxide, but the whiteness is lower, mainly because the generated calcium carbonate has more nucleation crystals on the surface of the sludge ash when the reactant amount is larger. Meanwhile, when the mass concentration of the calcium hydroxide is increased, the whiteness of the calcium hydroxide is also improved, because when the concentration of the reactant is higher, the collision probability of reactant molecules can be improved, the generated calcium carbonate is favorably crystallized on the surface of the sludge ash, and the whiteness of the composite papermaking filler is improved. The particle size of the composite sludge ash filler generated at the same time is also in the range of the particle size of common papermaking fillers.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (1)
1. A method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler is characterized by comprising the following steps:
(1) burning the papermaking sludge to obtain papermaking sludge ash;
(2) mixing the papermaking sludge ash obtained in the step (1) with calcium hydroxide solids, then adding water, fully stirring and mixing, and finally introducing mixed gas of carbon dioxide and air to perform carbonization modification reaction to obtain a composite papermaking filler;
the flow rate of the carbon dioxide is 0.10-0.20L/min;
the ratio of the carbon dioxide to the air flow rate is 1: 1-4;
the papermaking sludge comprises deinking sludge, sludge produced in the pulping and papermaking process, sludge produced in the pulping and papermaking wastewater treatment and sludge produced in the domestic wastewater treatment;
the burning temperature is 600-1000 ℃, and the burning time is 1.5-6.5 h;
the calcium hydroxide accounts for 1.0-20.0% of the total mass of the papermaking sludge ash, the calcium hydroxide and the water;
the stirring speed of the carbonization modification reaction is 400-1200 r/min;
the calcium hydroxide is purchased or prepared by calcium oxide and water;
the mass ratio of the papermaking sludge to the calcium hydroxide is 1: 3 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791049.6A CN110424179B (en) | 2019-08-26 | 2019-08-26 | Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler |
| PCT/CN2020/111165 WO2021037033A1 (en) | 2019-08-26 | 2020-08-26 | Method for solid waste modification of papermaking sludge after incineration to be used as papermaking filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791049.6A CN110424179B (en) | 2019-08-26 | 2019-08-26 | Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110424179A CN110424179A (en) | 2019-11-08 |
| CN110424179B true CN110424179B (en) | 2021-09-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910791049.6A Active CN110424179B (en) | 2019-08-26 | 2019-08-26 | Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110424179B (en) |
| WO (1) | WO2021037033A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424179B (en) * | 2019-08-26 | 2021-09-21 | 华南理工大学 | Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759258A (en) * | 1995-03-15 | 1998-06-02 | Minerals Technologies Inc. | Recycling of mineral fillers from the residue of a paper deinking plant |
| GB9507494D0 (en) * | 1995-04-11 | 1995-05-31 | Ecc Int Ltd | Recovery of useful materials from de-inking plant sludge |
| GB9507710D0 (en) * | 1995-04-13 | 1995-05-31 | Ecc Int Ltd | Waste paper treatment process |
| RU2079454C1 (en) * | 1995-07-18 | 1997-05-20 | Грудинин Владимир Павлович | Method of processing excessive activated sludge |
| BR9908118B1 (en) * | 1998-02-20 | 2009-12-01 | process for obtaining integral fiber with calcium carbonate particles and complex product, containing fibers and crystallized charges in their contact. | |
| EP2075295A4 (en) * | 2006-10-02 | 2013-08-14 | Okutama Kogyo Co Ltd | Coating solution and coated paper coated with the same |
| JP4952540B2 (en) * | 2007-11-27 | 2012-06-13 | 王子製紙株式会社 | Coated paper for gravure printing |
| GB0921820D0 (en) * | 2009-12-14 | 2010-01-27 | Calcitech Synthetic Minerals Ltd | Production and/or recovery of products from waste sludge |
| CN106224980A (en) * | 2016-08-10 | 2016-12-14 | 山东华泰纸业股份有限公司 | A kind of papermaking solid waste incineration proportioning process |
| CN110424179B (en) * | 2019-08-26 | 2021-09-21 | 华南理工大学 | Method for modifying solid waste after incineration of papermaking sludge to be used as papermaking filler |
-
2019
- 2019-08-26 CN CN201910791049.6A patent/CN110424179B/en active Active
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2020
- 2020-08-26 WO PCT/CN2020/111165 patent/WO2021037033A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021037033A1 (en) | 2021-03-04 |
| CN110424179A (en) | 2019-11-08 |
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