CN114229857B - Production process of white carbon black special for printing ink - Google Patents
Production process of white carbon black special for printing ink Download PDFInfo
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- CN114229857B CN114229857B CN202111622773.XA CN202111622773A CN114229857B CN 114229857 B CN114229857 B CN 114229857B CN 202111622773 A CN202111622773 A CN 202111622773A CN 114229857 B CN114229857 B CN 114229857B
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- carbon black
- white carbon
- sodium silicate
- solution
- silicate solution
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 239000006229 carbon black Substances 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000010009 beating Methods 0.000 claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 12
- 239000003607 modifier Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 78
- 239000004115 Sodium Silicate Substances 0.000 claims description 68
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 68
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 68
- 239000000047 product Substances 0.000 claims description 64
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 50
- 238000004537 pulping Methods 0.000 claims description 40
- 239000002002 slurry Substances 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- -1 iron ions Chemical class 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 229920000573 polyethylene Polymers 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000706 filtrate Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 238000001694 spray drying Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910021645 metal ion Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000945 filler Substances 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 description 13
- 235000012239 silicon dioxide Nutrition 0.000 description 12
- 238000012856 packing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
- C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/90—Other properties not specified above
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Silicon Compounds (AREA)
- Paper (AREA)
Abstract
A production process of white carbon black special for printing ink comprises the following steps: a) synthesis reaction, b) filtration and beating treatment, c) drying treatment, d) modifier treatment and e) crushing treatment. The special white carbon black for the ink prepared by the production process has high quality, is designed aiming at the ink, has the hydrophobicity of 40-50, can effectively improve the physicochemical property of the ink when being added into the ink, has a good three-dimensional network structure, has large specific surface area and high activity, can form the network structure when the ink is dried, and thus improves the storage stability, printing adaptability and other properties of the ink; meanwhile, the strength and the smoothness of the ink are improved, and particularly the adsorption force and the filler dispersibility of the ink are greatly improved, so that the printing effect is very good.
Description
Technical Field
The invention relates to the field of white carbon black production, in particular to a production process of white carbon black special for printing ink.
Background
The ink is an important material for printing, and is a viscous colloidal fluid, and patterns and characters are displayed on a printing stock through printing or spray painting. As social demands increase, ink varieties and yields expand and grow accordingly. The prior ink is generally added with a certain amount of white carbon black to improve the physicochemical properties of the ink such as adsorption capacity and filler dispersibility.
The prior white carbon black is generally prepared by adopting a traditional precipitation method, sodium silicate solution and sulfuric acid are used as raw materials, and the white carbon black can be obtained through the steps of synthesis, washing, refining, drying and the like. Therefore, there is an urgent need to produce a white carbon black for ink. Thus, it has been desired to produce a white carbon black for ink.
Disclosure of Invention
The invention provides a production process of white carbon black special for ink, which aims to overcome the defects that the white carbon black prepared by the existing production process is not designed for the ink, so that the effect of improving the physicochemical property of the ink is not ideal, and particularly the adsorption force and filler dispersibility of the ink are not good.
In order to solve the technical problems, the invention adopts the following technical scheme:
A production process of white carbon black special for printing ink comprises the following steps: a) The method comprises the steps of (1) carrying out a synthesis reaction, placing a sodium silicate solution with the concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-55 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, and controlling the reaction by adjusting the flow rate of the solution to the pH value of the reaction solution to be 3.0-6.0 to obtain a first dilute slurry; b) Filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, controlling the solid content of a white carbon black filter cake to be 10% -20% and the sulfate content to be below 0.5%, and pulping by a pulping machine to obtain second thin slurry; c) Drying, namely conveying the second thin slurry into a drying tower for spray drying, so that the moisture content of the white carbon black product after the drying is controlled within 3%, and obtaining a first white carbon black finished product; d) Treating with modifier, adding quantitative polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to 110+/-5 ℃, adding a first white carbon black finished product after the polyethylene wax is completely melted, and starting stirring for 0.5-1 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 10-20% of that of the white carbon black product; e) And (3) crushing the second white carbon black finished product to a particle size of 3-5 mu m by a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 40-50.
Further, the first thin slurry in the step a) is produced by adopting a plurality of gradual synthesis modes, and the specific modes are as follows: 1) The sodium silicate solution with the concentration of 0.1-1.0mol/L is placed in a reaction kettle, so that the temperature of the sodium silicate solution in the reaction kettle is controlled to be 10-30 ℃, under the condition of stirring the sodium silicate solution, dilute sulfuric acid solution with the mass fraction of 5-10% is slowly added, the reaction temperature is controlled to be 10-30 ℃ through cooling water, and after the pH value of the solution after the reaction reaches 5.0-7.0, the sulfuric acid solution is stopped to be added, and the first solution is obtained after the reaction is finished; 2) Standing the first solution in the reaction kettle for a period of time, and aging the first solution after the first solution becomes gel, wherein the aging time is controlled to be 0.5-1.0 hour; 3) And (3) rapidly and uniformly scattering gel liquid in the reaction kettle, rapidly heating the reaction kettle to 50+/-5 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.1-1.0mol/L and a dilute sulfuric acid solution with the mass fraction of 5% -10% under the condition of ensuring constant temperature, and controlling the reaction by adjusting the flow of the solution to obtain the first dilute slurry until the pH value of the reaction solution is 3.0-6.0.
Further, the pulping treatment in the step b) is three-stage pulping treatment, firstly, the white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine, and the rotating speed of the primary pulping machine is controlled to be 60-100 revolutions per minute; then, carrying out secondary beating operation on the primary pulp through a secondary beating machine to obtain middle-grade pulp, wherein the rotating speed of the secondary beating machine is controlled to be 80-120 r/min; and finally, carrying out third beating operation on the medium-grade pulp through a three-grade beating machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-grade beating machine is controlled to be 100-140 revolutions per minute, and the high-grade pulp is the second dilute pulp.
Further, the sodium silicate solution is required to be purified before the step a) to remove impurities and heavy metals in the sodium silicate solution.
Further, in the step e), the second white carbon black finished product is coarsely crushed by an airflow crusher, and then the coarsely crushed second white carbon black finished product is finely crushed by an ultrafine crusher, so that the grain size of the final second white carbon black finished product is 3-5 μm.
By adopting the technical scheme, the special white carbon black for the ink has the beneficial effects that the special white carbon black for the ink prepared by the production process has high quality and is designed for the ink, the hydrophobicity of the special white carbon black for the ink can reach 40-50, the special white carbon black for the ink can be added into the ink to effectively improve the physicochemical property of the ink, and the white carbon black has a good three-dimensional network structure, large specific surface area and high activity, and can form the network structure when the ink is dried, so that the storage stability, printing adaptability and other properties of the ink are improved; meanwhile, the strength and the smoothness of the ink are improved, and particularly the adsorption force and the filler dispersibility of the ink are greatly improved, so that the printing effect is very good.
Drawings
FIG. 1 is a schematic illustration of the process flow of the present invention.
FIG. 2 is a schematic diagram of another process flow of the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
Example 1
Reference is made to fig. 1. A production process of white carbon black special for printing ink comprises the following steps: a) The method comprises the steps of (1) carrying out a synthesis reaction, placing a sodium silicate solution with the concentration of 0.1mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 50 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5% under the condition of stirring the sodium silicate solution, and controlling the reaction by adjusting the flow of the sodium silicate solution and the dilute sulfuric acid solution until the pH value of the reaction solution is 6.0+/-0.5, so as to obtain a first dilute slurry; the first dilute slurry is produced by adopting a mode of stepwise synthesis for a plurality of times, and the specific mode is as follows: 1) Placing a sodium silicate solution with the preparation concentration of 0.1mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 30 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5% -10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 30 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the solution after the reaction reaches 7.0, and obtaining a first solution after the reaction is finished; 2) Standing the first solution in the reaction kettle for a period of time, and aging the first solution after the first solution becomes gel, wherein the aging time is controlled to be 0.5 hour; 3) And (3) rapidly and uniformly scattering gel liquid in the reaction kettle, rapidly heating the reaction kettle to about 50 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.1mol/L and a dilute sulfuric acid solution with the mass fraction of 10% under the condition of ensuring constant temperature, and controlling the reaction by adjusting the flow of the solution to the pH value of the reaction solution to be 6.0+/-0.5, thereby obtaining the first dilute slurry.
B) Filtering and pulping, namely performing plate-and-frame (i.e. plate-and-frame filter press) filtering and washing treatment on the first thin slurry, controlling the solid content of a white carbon black filter cake to be 10% and the sulfate content to be less than 0.5%, and pulping by a pulping machine to obtain second thin slurry; the pulping treatment is three-stage pulping treatment, firstly, a white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine, and the rotating speed of the primary pulping machine is controlled at 60 revolutions per minute; then, carrying out secondary beating operation on the primary pulp through a secondary beating machine to obtain middle-grade pulp, wherein the rotating speed of the secondary beating machine is controlled at 80 revolutions per minute; and finally, carrying out third beating operation on the medium-grade pulp through a three-grade beating machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-grade beating machine is controlled to be 100 revolutions per minute, and the high-grade pulp is the second dilute pulp.
C) Drying, namely conveying the second thin slurry into a drying tower for spray drying, so that the moisture content of the white carbon black product after the drying is controlled within 3%, and obtaining a first white carbon black finished product; the silicon dioxide also needs to be subjected to strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then packaging and bagging are carried out; the method for the strong magnetic iron removal treatment comprises the following steps: a strong magnetic rod is arranged on a discharge hole of the packing machine, and the strong magnetic rod is used for carrying out strong magnetic action on the silicon dioxide, so that magnetic metal impurities in the silicon dioxide are effectively removed.
D) Treating with modifier, adding quantitative polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to about 105 ℃, adding the first white carbon black finished product after the polyethylene wax is completely melted, and stirring for 1 hour to obtain the second white carbon black finished product, wherein the mass of the polyethylene wax is 10% of the mass of the white carbon black product.
E) And (3) crushing the second white carbon black finished product to a particle size of 3 mu m by a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 40. And (3) carrying out coarse grinding on the second white carbon black finished product through an airflow grinder, and then carrying out fine grinding treatment on the second white carbon black finished product after coarse grinding through an ultrafine grinder, so that the grain size of the final second white carbon black finished product is 3 mu m.
Example two
Reference is made to fig. 1. A production process of white carbon black special for printing ink comprises the following steps: a) The method comprises the steps of (1) carrying out a synthesis reaction, namely placing a sodium silicate solution with the preparation concentration of 1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 10 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 10% under the condition of stirring the sodium silicate solution, and controlling the reaction by adjusting the flow of the sodium silicate solution and the dilute sulfuric acid solution until the pH value of the reaction solution is 3.0+/-0.5, so as to obtain first dilute slurry; the first dilute slurry is produced by adopting a mode of stepwise synthesis for a plurality of times, and the specific mode is as follows: 1) Placing a sodium silicate solution with the preparation concentration of 1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 10 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 10 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the solution after the reaction reaches 5.0+/-0.5, and obtaining a first solution after the reaction is finished; 2) Standing the first solution in the reaction kettle for a period of time, and aging the first solution after the first solution becomes gel, wherein the aging time is controlled to be 1.0 hour; 3) And (3) rapidly and uniformly scattering gel liquid in the reaction kettle, rapidly heating the reaction kettle to about 45 ℃, simultaneously adding a sodium silicate solution with the concentration of 1.0mol/L and a dilute sulfuric acid solution with the mass fraction of 5% under the condition of ensuring constant temperature, and controlling the reaction by adjusting the flow of the solution to obtain the first dilute slurry until the pH value of the reaction solution is 3.0+/-0.5.
B) Filtering and pulping, namely performing plate-and-frame (i.e. plate-and-frame filter press) filtering and washing treatment on the first thin slurry, controlling the solid content of a white carbon black filter cake to be 20% and the sulfate content to be less than 0.5%, and pulping by a pulping machine to obtain second thin slurry; the pulping treatment is three-stage pulping treatment, firstly, a white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine, and the rotating speed of the primary pulping machine is controlled at 100 revolutions per minute; then, carrying out secondary beating operation on the primary pulp through a secondary beating machine to obtain middle-grade pulp, wherein the rotating speed of the secondary beating machine is controlled at 120 revolutions per minute; and finally, carrying out third beating operation on the medium-grade pulp through a three-grade beating machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-grade beating machine is controlled to be 140 revolutions per minute, and the high-grade pulp is the second dilute pulp.
C) Drying, namely conveying the second thin slurry into a drying tower for spray drying, so that the moisture content of the white carbon black product after the drying is controlled within 3%, and obtaining a first white carbon black finished product; the silicon dioxide also needs to be subjected to strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then packaging and bagging are carried out; the method for the strong magnetic iron removal treatment comprises the following steps: a strong magnetic rod is arranged on a discharge hole of the packing machine, and the strong magnetic rod is used for carrying out strong magnetic action on the silicon dioxide, so that magnetic metal impurities in the silicon dioxide are effectively removed.
D) Treating with modifier, adding quantitative polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to about 115 ℃, adding a first white carbon black finished product after the polyethylene wax is completely melted, and stirring for 0.5 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 20% of the mass of the white carbon black product.
E) And (3) crushing, namely crushing the second white carbon black finished product to a particle size of 5 mu m through a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 50. And (3) carrying out coarse grinding on the second white carbon black finished product through an airflow grinder, and then carrying out fine grinding treatment on the second white carbon black finished product after coarse grinding through an ultrafine grinder, so that the grain size of the final second white carbon black finished product is 5 mu m.
Example III
Reference is made to fig. 2. A production process of white carbon black special for printing ink comprises the following steps: it comprises the following steps:
a) Purifying to remove impurities and heavy metals in the sodium silicate solution. The purification treatment mode is as follows: 1) Introducing the sodium silicate solution into a micro-pore filter (such as a pore diameter of 0.2-1 um) for filtering to obtain a first sodium silicate solution so as to remove solid impurities in the first sodium silicate solution; 2) Placing the first sodium silicate filtrate into a reaction kettle, and then adding a precipitant (such as sodium sulfide) into the reaction kettle under the condition of stirring the first sodium silicate filtrate, wherein the adding amount of the precipitant is 4-6% of the mass of the first filtrate (the optimal value is 5%), stopping stirring after a preset stirring time is obtained to obtain a second sodium silicate solution, wherein the stirring time in the reaction kettle is controlled to be 35-55 minutes (the optimal time is 45 minutes), and the temperature in the reaction kettle is controlled to be 55-65 ℃ (the optimal temperature is 60 ℃); the purpose is to react iron ions and other metal ions with a precipitator to produce solid particles with larger particle size; 3) And (3) carrying out deep filtration on a second sodium silicate solution precise filter (the medium is active carbon), and eliminating metallic impurities (such as iron ions) existing in ionic state in the first filtrate to obtain high-purity sodium silicate. The purification treatment mode is ideal, and adopts a mode of combining physical impurity removal filtration and chemical impurity removal filtration to greatly remove solid impurities in the sodium silicate solution and metal impurities existing in ionic state, thereby greatly improving the quality of sodium silicate.
B) The method comprises the steps of (1) carrying out a synthesis reaction, placing a sodium silicate solution with the preparation concentration of 0.6mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 45 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 8% under the condition of stirring the sodium silicate solution, and controlling the reaction by adjusting the flow of the sodium silicate solution and the dilute sulfuric acid solution until the pH value of the reaction solution is 5.0+/-0.5, so as to obtain a first dilute slurry; the first dilute slurry is produced by adopting a mode of stepwise synthesis for a plurality of times, and the specific mode is as follows: 1) Placing a sodium silicate solution with the preparation concentration of 0.6mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 20 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 8% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 20 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the solution after the reaction reaches 6.0, and obtaining a first solution after the reaction is finished; 2) Standing the first solution in the reaction kettle for a period of time, and aging the first solution after the first solution becomes gel, wherein the aging time is controlled to be 0.8 hour; 3) And (3) rapidly and uniformly scattering gel liquid in the reaction kettle, rapidly heating the reaction kettle to about 45 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.6mol/L and a dilute sulfuric acid solution with the mass fraction of 8% under the condition of ensuring constant temperature, and controlling the reaction by adjusting the flow of the solution to the pH value of the reaction solution to be 5.0+/-0.5, so as to obtain the first dilute slurry.
C) Filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, and controlling the solid content of a white carbon black filter cake to be 15% and the sulfate content to be below 0.5%; pulping by a pulping machine to obtain second dilute slurry; the specific operation is as follows: and the first thin slurry is filtered (i.e. coarse filtered) by a plate-and-frame filter press to obtain thick slurry, and then the thick slurry is conveyed to a membrane filter press to be filtered (i.e. fine filtered) again to obtain a white carbon black filter cake. The two-step filtering operation, namely the operation mode of combining coarse filtering and fine filtering, is adopted, and the filtering and washing treatment effect is good. The pulping treatment is three-stage pulping treatment, firstly, a white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine, and the rotating speed of the primary pulping machine is controlled at 80 revolutions per minute; then, carrying out secondary beating operation on the primary pulp through a secondary beating machine to obtain middle-grade pulp, wherein the rotating speed of the secondary beating machine is controlled to be 100 revolutions per minute; and finally, carrying out third beating operation on the medium-grade pulp through a three-grade beating machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-grade beating machine is controlled to be 120 revolutions per minute, and the high-grade pulp is the second dilute pulp.
D) Drying, namely conveying the second thin slurry into a drying tower for spray drying, so that the moisture content of the white carbon black product after the drying is controlled within 3%, and obtaining a first white carbon black finished product; the silicon dioxide also needs to be subjected to strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then packaging and bagging are carried out; the method for the strong magnetic iron removal treatment comprises the following steps: a strong magnetic rod is arranged on a discharge hole of the packing machine, and the strong magnetic rod is used for carrying out strong magnetic action on the silicon dioxide, so that magnetic metal impurities in the silicon dioxide are effectively removed.
E) Treating with modifier, adding quantitative polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to about 110deg.C, adding the first white carbon black product after the polyethylene wax is completely melted, and stirring for 0.6 hr to obtain the second white carbon black product, wherein the mass of the polyethylene wax is 15% of that of the white carbon black product.
F) And (3) crushing, namely crushing the second white carbon black finished product to a particle size of 4 mu m through a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 45. And (3) carrying out coarse grinding on the second white carbon black finished product through an airflow grinder, and then carrying out fine grinding treatment on the second white carbon black finished product after coarse grinding through an ultrafine grinder, so that the grain size of the final second white carbon black finished product is 4 mu m.
The purification treatment may be performed in the following manner: under the condition of stirring the sodium silicate solution, adding a flocculating agent with the preparation concentration of 0.15% into the sodium silicate solution with the preparation concentration of 1.0mol/L, and filtering out impurities separated out from the sodium silicate solution by using a plate frame after stirring uniformly for 1.2 hours to obtain the 1.0mol/L sodium silicate solution with higher purity so as to remove the impurities and heavy metals in the sodium silicate solution; the flocculant can be inorganic salt flocculant such as polyaluminum sulfate, polysilicic acid or aluminum silicate.
The test results of the white carbon black finished product prepared by the above examples are shown in the following table:
| Project name | Example 1 | Example two | Example III |
| Silica content (based on post-ignition product)% | 98.5 | 98.9 | 99.5 |
| Specific surface area square meter/g | 280 | 300 | 350 |
| Degree of hydrophobicity | 40 | 50 | 45 |
| The content of total iron (Fe) is mg/kg less than or equal to | 300 | 200 | 100 |
| The content of heavy metal As is less than or equal to mg/kg | 0.5 | 0.35 | 0.15 |
| The Pb content of heavy metal is less than or equal to mg/kg | 0.8 | 0.6 | 0.4 |
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (2)
1. A production process of white carbon black special for printing ink is characterized by comprising the following steps: it comprises the following steps: a) The preparation method comprises the steps of (1) carrying out a synthesis reaction, namely placing a sodium silicate solution with the preparation concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-55 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, and controlling the reaction by adjusting the flow rate of the solution until the pH value of the reaction solution is 3.0-6.0, so as to obtain a first dilute slurry, wherein the first dilute slurry is produced by adopting a mode of stepwise synthesis for a plurality of times, and the specific mode is as follows: 1) The sodium silicate solution with the concentration of 0.1-1.0mol/L is placed in a reaction kettle, so that the temperature of the sodium silicate solution in the reaction kettle is controlled to be 10-30 ℃, under the condition of stirring the sodium silicate solution, dilute sulfuric acid solution with the mass fraction of 5-10% is slowly added, the reaction temperature is controlled to be 10-30 ℃ through cooling water, and after the pH value of the solution after the reaction reaches 5.0-7.0, the sulfuric acid solution is stopped to be added, and the first solution is obtained after the reaction is finished; 2) Standing the first solution in the reaction kettle for a period of time, and aging the first solution after the first solution becomes gel, wherein the aging time is controlled to be 0.5-1.0 hour; 3) The gel liquid in the reaction kettle is quickly and evenly dispersed, after the temperature in the reaction kettle is quickly raised to 50+/-5 ℃, under the condition of ensuring constant temperature, sodium silicate solution with the concentration of 0.1-1.0mol/L and dilute sulfuric acid solution with the mass fraction of 5% -10% are simultaneously added, and the reaction is controlled through the flow adjustment of the solution of the sodium silicate solution and the dilute sulfuric acid solution until the pH value of the reaction solution is 3.0-6.0, so that first dilute slurry is obtained; before the step a), the sodium silicate solution is further subjected to purification treatment to remove impurities and heavy metals in the sodium silicate solution, wherein the purification treatment mode is as follows: 1) Introducing the sodium silicate solution into a microporous filter for filtering to obtain a first sodium silicate solution so as to remove solid impurities in the first sodium silicate solution; 2) Placing the first sodium silicate filtrate in a reaction kettle, then adding a sodium sulfide precipitant into the reaction kettle under the condition of stirring the first sodium silicate filtrate, wherein the adding amount of the sodium sulfide precipitant is 4-6% of the mass of the first filtrate, stopping stirring after a preset stirring time is obtained to obtain a second sodium silicate solution, controlling the stirring time in the reaction kettle to be 35-55 minutes, and controlling the temperature in the reaction kettle to be 55-65 ℃; the purpose is to react iron ions and other metal ions with sodium sulfide precipitant to produce solid particles with larger particle size; 3) Deep filtering the second sodium silicate solution through a precise filter with an active carbon medium to eliminate metallic impurities existing in ionic state in the first filtrate to obtain high-purity sodium silicate; b) Filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, controlling the solid content of a white carbon black filter cake to be 10% -20% and the sulfate content to be below 0.5%, and pulping by a pulping machine to obtain second thin slurry; the pulping treatment is three-stage pulping treatment, firstly, a white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine, and the rotating speed of the primary pulping machine is controlled to be 60-100 revolutions per minute; then, carrying out secondary beating operation on the primary pulp through a secondary beating machine to obtain middle-grade pulp, wherein the rotating speed of the secondary beating machine is controlled to be 80-120 r/min; finally, carrying out third beating operation on the medium-grade pulp through a three-grade beating machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-grade beating machine is controlled to be 100-140 revolutions per minute, and the high-grade pulp is the second dilute pulp; c) Drying, namely conveying the second thin slurry into a drying tower for spray drying, so that the moisture content of the white carbon black product after the drying is controlled within 3%, and obtaining a first white carbon black finished product; the white carbon black product is subjected to strong magnetic iron removal treatment to obtain a first white carbon black finished product with strong anti-caking capacity and strong fluidity, and then packaging and bagging are carried out; the method for the strong magnetic iron removal treatment comprises the following steps: a strong magnetic rod is arranged on a discharge hole of the packer, and the strong magnetic rod is used for carrying out strong magnetic action on the white carbon black product, so that magnetic metal impurities in the white carbon black product are effectively removed; d) Treating with a modifier, putting quantitative polyethylene wax into high-speed mixing equipment, heating the high-speed mixing equipment to 110+/-5 ℃, putting a first white carbon black finished product after the polyethylene wax is completely melted, and starting stirring for 0.5-1 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 10-20% of that of the white carbon black product; e) Crushing, namely crushing the second white carbon black finished product to a particle size of 3-5 mu m by a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product reaches 40-50.
2. The production process of white carbon black special for ink according to claim 1, wherein the production process is characterized in that: in the step e), the second white carbon black finished product is firstly subjected to coarse grinding through an airflow grinder, and then the second white carbon black finished product after coarse grinding is subjected to fine grinding through an ultrafine grinder, so that the grain size of the final second white carbon black finished product is 3-5 mu m.
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