CN113445356A - Diatomite filter aid for special papermaking - Google Patents
Diatomite filter aid for special papermaking Download PDFInfo
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- CN113445356A CN113445356A CN202110693689.0A CN202110693689A CN113445356A CN 113445356 A CN113445356 A CN 113445356A CN 202110693689 A CN202110693689 A CN 202110693689A CN 113445356 A CN113445356 A CN 113445356A
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- soil
- coarse
- diatomite
- crushing
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- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- 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
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a diatomite filter aid for special papermaking, which comprises the following components in percentage by mass: 30-80% of fine soil and 20-70% of coarse soil, wherein the particle size of the fine soil is less than or equal to 45 mu m, the pore size of the fine soil is 0.1-0.3 mu m, the particle size of the coarse soil is less than or equal to 45 mu m, and the pore size of the coarse soil is 0.8-1.0 mu m; the fine soil is obtained by coarsely crushing diatomite raw ore, washing with alkali, drying and crushing to 325 meshes; the coarse soil is prepared by coarse crushing raw diatomite ore and adding 5% Na2CO3Mixing, calcining and crushing to 325 meshes. The diatomite filter aid has the following advantages: the water filtering performance is improved, and the energy is saved. Secondly, the diatomite filter aid is a softer loose mineral material and can be used as a filler, so that the cost is saved. Third, adsorbability: can be produced cleanly, and the service life of the blanket and the net is prolonged. Adsorption: reduce the ionic garbage discharged from the waste water, and is beneficial to environmental protection.
Description
Technical Field
The application relates to a diatomite filter aid for special papermaking.
Background
As early as 10 years ago, computer networks were popularized, and paperless office work was started. The productivity of the cultural paper is gradually reduced over the years, and the trend of the paper making is declined. However, the productivity of paper manufacture has not decreased over the years, but has increased over the years. The renewable recycling of paper is its bright spot. Therefore, the replacement of wood by paper and the replacement of plastic by paper are the precondition of rapid development of papermaking in recent years, and the replacement of wood by environment-friendly paper and the replacement of plastic engineering materials by environment-friendly paper are more and more different. Moreover, the research directions of saving wood fiber and recycling waste fiber materials, filling wear-resistant mineral fillers and the like are the research directions of the papermaking process.
As is well known, the production of high quality paper without separation of high quality wood pulp, environmental protection and saving of wood pulp fiber are the subjects of continuous pursuit and research in paper making technology. Therefore, in the existing papermaking process, the aim of saving wood pulp fiber by adding other fiber materials such as minerals is pursued, so that the environment is protected, and the cost is saved. However, the addition of other fibrous materials such as minerals may increase the viscosity and the like, which is disadvantageous for dewatering.
At present, in the production of common papermaking and special papermaking processes in China, a flocculating agent is generally adopted as a filter aid, the flocculating agent is generally a cation or anion high polymer, the uniformity of the produced paper is poor by using the flocculating agent, the high polymer belongs to organic matters, COD is increased, and the environment is influenced. Therefore, with the increasing requirements of the papermaking process, the invention provides a papermaking filter aid developed aiming at the production process of the special paper.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a special diatomite filter aid for papermaking.
The diatomite filter aid for special papermaking comprises the following components in parts by mass: 30-80% of fine soil and 20-70% of coarse soil, wherein the particle size of the fine soil is less than or equal to 45 mu m, the pore size of the fine soil is 0.1-0.3 mu m, the particle size of the coarse soil is less than or equal to 45 mu m, and the pore size of the coarse soil is 0.8-1.0 mu m; the fine soil is obtained by coarsely crushing, alkali washing, drying and crushing raw diatomite ores; the coarse soil is prepared by coarse crushing raw diatomite ore and adding Na2CO3Mixing, calcining and crushing.
Preferably, the special diatomite filter aid for papermaking comprises the following components in parts by mass: fine soil 40-50% and coarse soil 50-60%.
Preferably, the special diatomite filter aid for papermaking comprises the following components in parts by mass: 80% of fine soil, 20% of coarse soil, the aperture of the fine soil is 0.1 mu m, and the aperture of the coarse soil is 0.8 mu m; or 50% of fine soil, 50% of coarse soil, the aperture of the fine soil is 0.2 mu m, and the aperture of the coarse soil is 0.9 mu m; or 30% of fine soil, 70% of coarse soil, the aperture of the fine soil is 0.3 μm, and the aperture of the coarse soil is 1.0 μm.
Preferably, the fine soil is prepared by the following method: step 1): mixing Si02Airing the diatomite raw ore with the content of more than 80 percent, coarsely crushing the diatomite raw ore to the diameter of 0.5cm, and performing the step 2): leaching with 1% NaOH solution, and then airing or drying with a hot blast stove, wherein the step 3) is as follows: and crushing the mixture to 325 meshes by a centrifugal mill, wherein the passing rate is more than 99 percent, and obtaining the fine soil.
Preferably, step 1): will select Si02Coarse crushing the diatomite raw ore with the content of more than 80% to the diameter of 0.5cm, and step 2): adding 5% Na2CO3Uniformly mixing, calcining in a rotary kiln at the temperature of 1000-: after the hammer crusher is crushed, the coarse soil is crushed to 325 meshes by a centrifugal grinder, and the passing rate is more than 99 percent to obtain the coarse soil.
The present application is further described below:
the diatomite filter aid is used for helping the filtered liquid to improve the filtering speed, and has a unique pore structure and stable chemical property. Not only can obtain high flow rate ratio of the filtered body, but also can prevent fine suspended substances from losing. The diatomite filter aid can prevent fine particles with the particle size of 0.1-1 mu m at minimum, so the diatomite filter aid can improve the filtration speed firstly and improve the retention rate secondly, and is very suitable for papermaking.
The production process comprises the following technical approaches:
the purpose of the diatomaceous earth is to obtain the most desirable pore size and pore volume, which may improve the filtration capacity of the article. We define the processed diatomaceous earth as fine and coarse.
Fine earth, which means diatomaceous earth with small pore size, about 0.2 μm in pore size. Fine soil: the advantages are that: the manufacturing cost is low. The disadvantages are as follows: small aperture and low whiteness.
Coarse earth, refers to diatomaceous earth with large pore size, about 0.9 μm in pore size. Coarse soil has the advantages that: high whiteness and large aperture, which is beneficial to dehydration. The disadvantages are as follows: the manufacturing cost is high.
The coarse soil has large volume and high whiteness, but the production cost is high; the invention selects fine soil and coarse soil to compound to prepare the finished product according to the requirements of cost, whiteness, filtration speed and the like.
Formulation example one
Fine soil 80%, grain size less than or equal to 45 μm
20 percent of coarse soil and particle size less than or equal to 45 mu m
Whiteness of 70-80
Formulation example two
50% of fine soil and particle size less than or equal to 45 mu m
50% of coarse soil and grain diameter less than or equal to 45 mu m
Whiteness of 80
Formulation example three
30 percent of fine soil and grain diameter less than or equal to 45 mu m
70 percent of coarse soil and the grain diameter of less than or equal to 45 mu m
Whiteness > 80
The fine soil production process flow of the invention is described as follows: selecting Si0 with better whiteness2Airing the diatomite raw ore with the content of more than 80 percent to be half-dry; coarsely crushing to 0.5cm in diameter. Rinsing with alkaline water (1% NaOH solution), and air drying or drying with hot-blast stove. And crushing the mixture by a centrifugal mill until the passing rate of 325 meshes is more than 99 percent to obtain fine soil.
The process flow of the coarse soil production is described as follows: selection of Si02Raw diatomite ore with content of more than 80 percent; coarsely crushing to 0.5cm in diameter. Adding 5% of Na2CO3Mixing evenly, calcining in a rotary furnace at 1050 ℃ and 1000 ℃ and crushing by a hammer crusher, and crushing by a centrifugal mill until the 325-mesh passing rate is more than 99 percent to obtain coarse soil.
The diatomite filter aid is obtained by matching coarse soil and fine soil in proportion, and the technologies of aperture, filtering speed, whiteness, cost and the like of the diatomite filter aid can meet the requirements of special papermaking.
Compared with the prior art, the diatomite filter aid has the advantages that:
the diatomite filter aid has the characteristics that: the shape is complex and has no compressibility. Has ideal properties as a filter aid, and has stability and insolubility. Can form a 'bridging' phenomenon among particles and form a 'rigid' skeleton structure. The filtration rate is improved by 28 percent.
Depth effect: during filtration, smaller particles are retained by the pores of the internal deep and tortuous microchannels.
Adsorption: in effect, charge attraction. The particles attract each other to form clusters and adhere to the fibers. It can be considered that: intermolecular forces (also called van der waals forces) include permanent dipole action, induced dipole action and instantaneous dipole action; presence of Zeta potential; and thirdly, ion exchange process.
The diatomite filter aid for papermaking, researched and produced by the invention, can meet the requirement of filling other materials, and has the following advantages: the water filtering performance is improved, and the energy is saved. Secondly, the diatomite filter aid is a softer loose mineral material and can be used as a filler, so that the cost is saved. Third, adsorbability: can be produced cleanly, and the service life of the blanket and the net is prolonged. Adsorption: reduce the ionic garbage discharged from the waste water, and is beneficial to environmental protection. 5) The diatomite filter aid has the advantages that the diatomite filter aid is quick in dehydration in the process of manufacturing special paper, the formed paper entering a drying cylinder is drier, and the dry strength of the formed paper is increased. The steam consumption is reduced, the drying time is saved, the vehicle speed can be improved, and the yield is increased. The white water in the wire becomes clear and the conductivity is reduced.
Drawings
FIG. 1 is a flow chart of the fine soil preparation process of the present application,
FIG. 2 is a flow diagram of a process for making coarse soil according to the present application.
Detailed Description
Example 1
The diatomite filter aid for special papermaking is prepared by mixing the following components in parts by mass: fine soil 80% and coarse soil 20%, wherein the fine soil has a particle size of 45 μm or less, the fine soil has a pore size of 0.1 μm, the coarse soil has a particle size of 45 μm or less, and the coarse soil has a pore size of 0.8 μm.
Wherein the fine soil is prepared by the following method: step 1): mixing Si02Airing the diatomite raw ore with the content of more than 80 percent, coarsely crushing the diatomite raw ore to the diameter of 0.5cm, and performing the step 2): leaching with 1% NaOH solution, airing (or drying with a hot blast stove), and step 3): crushing the mixture to 325 mesh by a centrifugal mill, wherein the passing rate is more than 99 percent, and the fine soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 0.1 mu m is obtained.
The coarse soil is composed ofPrepared by the following method, step 1): will select Si02Coarse crushing the diatomite raw ore with the content of more than 80% to the diameter of 0.5cm, and step 2): adding 5% Na2CO3Uniformly mixing, calcining in a rotary kiln at the temperature of 1000-: after the crushing of the hammer crusher, the coarse soil is crushed to 325 meshes by a centrifugal grinder, the passing rate is more than 99 percent, and the coarse soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 0.8 mu m is obtained.
The whiteness of the special diatomite filter aid for papermaking prepared in the example 1 is 70-80.
Compared with the filter aid for special papermaking in the prior art, the diatomite filter aid for special papermaking prepared in example 1 has the following advantages:
the cost is low, the dewatering is fast, and the formed paper entering a drying cylinder is drier. The steam consumption is reduced by 10%, the drying time is saved, the vehicle speed can be improved, and the yield is increased. ② the white water under the net becomes clear, and the conductivity is reduced from 3000ms/m to 1500 ms/m.
Example 2
The diatomite filter aid for special papermaking is prepared by mixing the following components in parts by mass: 50% of fine soil and 50% of coarse soil, wherein the particle size of the fine soil is less than or equal to 45 mu m, the pore size of the fine soil is 0.2 mu m, the particle size of the coarse soil is less than or equal to 45 mu m, and the pore size of the coarse soil is 0.9 mu m.
The fine soil is prepared by the following method: step 1): mixing Si02Airing the diatomite raw ore with the content of more than 80 percent, coarsely crushing the diatomite raw ore to the diameter of 0.5cm, and performing the step 2): leaching with 1% NaOH solution, airing (or drying with a hot blast stove), and step 3): crushing the mixture to 325 mesh by a centrifugal mill, wherein the passing rate is more than 99 percent, and the fine soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 0.2 mu m is obtained.
The coarse soil is prepared by the following method: will select Si02Coarse crushing the diatomite raw ore with the content of more than 80% to the diameter of 0.5cm, and step 2): adding 5% Na2CO3Uniformly mixing, calcining in a rotary kiln at the temperature of 1000-: after the crushing of the hammer crusher, the coarse soil is crushed to 325 meshes by a centrifugal grinder, the passing rate is more than 99 percent, and the coarse soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 0.9 mu m is obtained.
The whiteness of the special diatomite filter aid for papermaking prepared in the example 2 is 80.
Compared with the filter aid for special papermaking in the prior art, the diatomite filter aid for special papermaking prepared in example 2 has the following advantages: the cost is moderate, the dehydration is fast, and the formed paper entering a drying cylinder is drier. The steam consumption is reduced by 12%, the drying time is saved, the vehicle speed can be improved, and the yield is increased. ② the white water under the net becomes clear, and the conductivity is reduced from 3000ms/m to 1200 ms/m.
Example 3
The diatomite filter aid for special papermaking is prepared by mixing the following components in parts by mass: 30 percent of fine soil and 70 percent of coarse soil, wherein the grain diameter of the fine soil is less than or equal to 45 mu m, the pore diameter of the fine soil is 0.3 mu m, the grain diameter of the coarse soil is less than or equal to 45 mu m, and the pore diameter of the coarse soil is 1.0 mu m.
The fine soil is prepared by the following method: step 1): mixing Si02Airing the diatomite raw ore with the content of more than 80 percent, coarsely crushing the diatomite raw ore to the diameter of 0.5cm, and performing the step 2): leaching with 1% NaOH solution, airing (or drying with a hot blast stove), and step 3): crushing the mixture to 325 mesh by a centrifugal mill, wherein the passing rate is more than 99 percent, and the fine soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 0.3 mu m is obtained.
The coarse soil is prepared by the following method: will select Si02Coarse crushing the diatomite raw ore with the content of more than 80% to the diameter of 0.5cm, and step 2): adding 5% Na2CO3Uniformly mixing, calcining in a rotary kiln at the temperature of 1000-: after the crushing of the hammer crusher, the coarse soil is crushed to 325 meshes by a centrifugal grinder, the passing rate is more than 99 percent, and the coarse soil with the grain diameter less than or equal to 45 mu m and the pore diameter of 1.0 mu m is obtained.
The whiteness of the special diatomite filter aid for papermaking prepared in the embodiment 3 is more than 80.
Compared with the filter aid for special papermaking in the prior art, the diatomite filter aid for special papermaking prepared in example 3 has the following advantages: the cost is slightly high, the whiteness is high, and the paper is suitable for high-grade white paper. The dewatering is fast and the formed paper entering the drying cylinder is drier. The steam consumption is reduced by 15%, the drying time is saved, the vehicle speed can be improved, and the yield is increased. ② the white water under the net becomes clear, and the conductivity is reduced from 3000ms/m to 1000 ms/m.
Claims (5)
1. The diatomite filter aid for special papermaking comprises the following components in parts by mass: 30-80% of fine soil and 20-70% of coarse soil, wherein the particle size of the fine soil is less than or equal to 45 mu m, the pore size of the fine soil is 0.1-0.3 mu m, the particle size of the coarse soil is less than or equal to 45 mu m, and the pore size of the coarse soil is 0.8-1.0 mu m; the fine soil is obtained by coarsely crushing, alkali washing, drying and crushing raw diatomite ores; the coarse soil is prepared by coarse crushing raw diatomite ore and adding Na2CO3Mixing, calcining and crushing.
2. The diatomite filter aid for special papermaking according to claim 1, characterized in that: the diatomite filter aid for special papermaking comprises the following components in percentage by mass: fine soil 40-50% and coarse soil 50-60%.
3. The special papermaking diatomite filter aid according to claim 1 or 2, characterized in that: the diatomite filter aid for special papermaking comprises the following components in percentage by mass: 80% of fine soil, 20% of coarse soil, the aperture of the fine soil is 0.1 mu m, and the aperture of the coarse soil is 0.8 mu m; or 50% of fine soil, 50% of coarse soil, the aperture of the fine soil is 0.2 mu m, and the aperture of the coarse soil is 0.9 mu m; or 30% of fine soil, 70% of coarse soil, the aperture of the fine soil is 0.3 μm, and the aperture of the coarse soil is 1.0 μm.
4. The diatomite filter aid for special papermaking according to claim 1, characterized in that: the fine soil is prepared by the following method: step 1): mixing Si02Airing the diatomite raw ore with the content of more than 80 percent, coarsely crushing the diatomite raw ore to the diameter of 0.5cm, and performing the step 2): leaching with 1% NaOH solution, and then airing or drying with a hot blast stove, wherein the step 3) is as follows: and crushing the mixture to 325 meshes by a centrifugal mill to obtain fine soil.
5. The diatomite filter aid for special papermaking according to claim 1, characterized in that: the coarse soil is prepared by the following method: step 1): will select Si02Coarse crushing the diatomite raw ore with the content of more than 80% to the diameter of 0.5cm, and step 2): adding 5% Na2CO3Mixing uniformly at 1000-1050 ℃ in a rotary kiln, step 3): after the crushing by the hammer crusher, the coarse soil is obtained by crushing by a centrifugal grinder to 325 meshes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110693689.0A CN113445356A (en) | 2021-06-22 | 2021-06-22 | Diatomite filter aid for special papermaking |
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| CN202110693689.0A CN113445356A (en) | 2021-06-22 | 2021-06-22 | Diatomite filter aid for special papermaking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318244A (en) * | 2022-08-24 | 2022-11-11 | 长白朝鲜族自治县天宝硅藻土功能制品有限公司 | Raw ore filter aid for producing diatom and process preparation method thereof |
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2021
- 2021-06-22 CN CN202110693689.0A patent/CN113445356A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318244A (en) * | 2022-08-24 | 2022-11-11 | 长白朝鲜族自治县天宝硅藻土功能制品有限公司 | Raw ore filter aid for producing diatom and process preparation method thereof |
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