CN116375072A - Method for producing modified calcium carbonate by aid method - Google Patents
Method for producing modified calcium carbonate by aid method Download PDFInfo
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- CN116375072A CN116375072A CN202310379095.1A CN202310379095A CN116375072A CN 116375072 A CN116375072 A CN 116375072A CN 202310379095 A CN202310379095 A CN 202310379095A CN 116375072 A CN116375072 A CN 116375072A
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- Prior art keywords
- calcium carbonate
- calcium
- mixed solution
- suspension
- white mud
- Prior art date
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 44
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 38
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 38
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 38
- 239000000725 suspension Substances 0.000 claims abstract description 38
- 239000011259 mixed solution Substances 0.000 claims abstract description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000003763 carbonization Methods 0.000 claims abstract description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 42
- 239000001110 calcium chloride Substances 0.000 claims description 23
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 10
- 239000004115 Sodium Silicate Substances 0.000 abstract description 11
- 229910052911 sodium silicate Inorganic materials 0.000 abstract description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000378 calcium silicate Substances 0.000 abstract description 5
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012467 final product Substances 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 229910004762 CaSiO Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- -1 on the one hand Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/65—Chroma (C*)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Abstract
The invention relates to the technical field of papermaking white mud treatment, in particular to a method for producing modified calcium carbonate by an auxiliary agent method, which comprises the following steps of: s1: adding a calcium chloride solution into the white mud suspension, stirring and reacting for 0.5-1h, and heating to 80-90 ℃ to obtain a first mixed solution for later use; s2: transferring the first mixed solution into a reaction kettle, adding calcium hydroxide suspension, reacting at constant temperature for 1.5-2.5h, and stirring after the constant temperature reaction is finished to obtain a second mixed solution for later use; s3: and (3) adding a calcium chloride solution into the second mixed solution obtained in the step S2, stirring and reacting for 0.5-1h, and then introducing carbon dioxide for carbonization to obtain the modified calcium carbonate. The aim is that: by converting sodium silicate in papermaking white mud into calcium silicate, not only can the blocking and attaching conditions of a transportation pipeline be reduced, but also the content of hydrochloric acid insoluble matters in the modified calcium carbonate can be reduced, and the quality of the modified calcium carbonate is improved.
Description
Technical Field
The invention relates to the technical field of papermaking white mud treatment, in particular to a method for producing modified calcium carbonate by an auxiliary agent method.
Background
For a long time, a large amount of white mud generated in the production process of paper factories is difficult to recover calcium carbonate because of high silicon content, and because the alkali content is more than 3%, the white mud is directly discharged, and huge pollution is generated to ecological environment and water resources and waste is caused, so that the papermaking white mud is generally recycled after being treated, and the papermaking white mud can be used for building mortar, building ceramic, cement production and the like.
In the subsequent treatment process of the papermaking white mud, because the papermaking white mud contains sodium silicate, due to the nature of the sodium silicate, the sodium silicate blocks a pipeline in the conveying process, is attached to transmission equipment to reduce the performance of the transmission equipment, and is converted into silicon dioxide in the subsequent carbonization process, so that the index of hydrochloric acid insoluble matters is reduced, and the quality of the final product is influenced.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for producing modified calcium carbonate by an auxiliary agent method, which not only can reduce the blocking and adhesion of a transportation pipeline, but also can reduce the content of hydrochloric acid insoluble substances in the modified calcium carbonate and improve the quality of the modified calcium carbonate by converting sodium silicate in papermaking white mud into calcium silicate.
The invention solves the technical problems by the following technical means:
a method for producing modified calcium carbonate by an auxiliary agent method comprises the following steps:
s1: adding a calcium chloride solution into the white mud suspension, stirring and reacting for 0.5-1h, and heating to 80-90 ℃ to obtain a first mixed solution for later use;
s2: transferring the first mixed solution into a reaction kettle, adding calcium hydroxide suspension, reacting at constant temperature for 1.5-2.5h, and stirring after the constant temperature reaction is finished to obtain a second mixed solution for later use;
s3: and (3) adding a calcium chloride solution into the second mixed solution obtained in the step S2, stirring and reacting for 0.5-1h, and then introducing carbon dioxide for carbonization to obtain the modified calcium carbonate.
Further, in the step S1, the concentration of the calcium chloride solution is 1.7-1.9mol/L, and the content of calcium chloride in the calcium chloride solution is 1.3-1.38 times of the content of sodium hydroxide in the white mud suspension.
Adding a calcium chloride solution into the white mud suspension to enable the calcium chloride solution to react with alkaline substances in the white mud suspension, mainly sodium hydroxide, to generate calcium hydroxide precipitate so as to reduce the concentration of soluble alkaline substances in the white mud suspension and facilitate the subsequent reaction; and the excessive addition of calcium chloride is avoided by controlling the addition of calcium chloride, so that the final material is hardened.
Before the white mud is prepared into a white mud suspension, the content of sodium hydroxide in the white mud is detected and analyzed, and the adding amount of calcium chloride is controlled according to the content of sodium hydroxide in the white mud.
In the step S2, when the calcium hydroxide suspension is added, preheating is needed, the preheating temperature is 80-90 ℃, and the Baume degree of the calcium hydroxide suspension is 14-16 Bes.
In the examples herein, the Baume degree of the calcium hydroxide suspension is preferably 15 Bes.
The preheated calcium hydroxide suspension is added to enable the calcium hydroxide suspension to directly react with sodium silicate in the white mud suspension to generate calcium silicate and CaSiO 3 With CO 2 Does not react, and does not have SiO in the later carbonization and drying processes 2 The production of the sodium silicate-sodium silicate composite material reduces the insoluble matters of hydrochloric acid, converts sodium silicate into calcium silicate, ensures that the white mud can not block a pipeline and be attached to transmission equipment during conveying, and simultaneously solves the problems of Na 2 SiO 3 The viscosity of the calcium carbonate to agglomerate and reduce the sedimentation volume.
Further, the content of hydrochloric acid insoluble matters in the calcium hydroxide is below 0.5%, and the purity of the calcium hydroxide is above 98%.
By controlling the content of the hydrochloric acid insoluble matters in the calcium hydroxide, the introduction of new hydrochloric acid insoluble matters is avoided, and the influence on the final product is reduced.
Further, in the step S2, the amount of the calcium hydroxide suspension added is 3-5% of the mass of the lime mud.
By controlling the amount of the added calcium hydroxide suspension, on the one hand, sodium silicate in the white mud suspension is fully reacted as much as possible, and on the other hand, the introduction of new impurities is reduced.
Further, in the step S3, the amount of calcium chloride added is 70-90% of the mass of the calcium hydroxide in the step S2.
The newly generated sodium hydroxide in the white mud suspension is completely reacted by adding the calcium chloride again, so that the existence of the sodium hydroxide in the white mud is avoided, the sodium hydroxide is converted into sodium carbonate in the subsequent carbonization process, and the sodium carbonate can cause yellowing of a final product and influence the quality of the product when the modified calcium carbonate is dried; the whiteness of the final product can be increased by controlling the amount of the added calcium chloride, and meanwhile, the alkali reaction (pH rise) caused by the residual sodium carbonate is avoided.
Further, in the step S3, the specific steps of carbonization are as follows: after the slurry is moved to a carbonization tower, CO is introduced 2 The stirring speed is 50r/min, the carbonization is 0.5 to 1H, and the pH of the slurry is less than 8.5.
By carbonizing, the excessive calcium hydroxide is completely converted into modified calcium carbonate, the modified calcium carbonate does not contain silicon dioxide, a product with lower content of hydrochloric acid insoluble matters can be obtained, and the quality of the modified calcium carbonate is better.
Further, the carbon dioxide content is more than 98%, and the flow is more than 245g/min.
The invention adopting the technical scheme has the following beneficial effects:
1. on one hand, the sodium silicate in the white mud can be converted into calcium silicate by adding two auxiliary agents, namely calcium chloride and calcium hydroxide, into the white mud suspension in steps, so that the problems of pipeline blockage, transmission equipment adhesion and calcium carbonate agglomeration caused by the sodium silicate contained in the white mud and influence on the sedimentation volume of the calcium carbonate are solved; on the other hand, the problem of yellowing of calcium carbonate caused by sodium carbonate generated by sodium hydroxide in the carbonization process caused by sodium hydroxide in the white mud is avoided, and meanwhile, the problem of alkali reversion (pH rise) caused by sodium carbonate residues is also solved;
2. the method is beneficial to the reaction in the whole process by controlling the amount and the steps of the added calcium chloride, and can completely remove the sodium hydroxide in the white mud and increase the whiteness of the calcium carbonate.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, based on the embodiments of the invention, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the invention:
example 1 method for producing modified calcium carbonate by aid method
S1: adding a calcium chloride solution into the white mud suspension, wherein the content of calcium chloride in the calcium chloride solution is 1.3 times of the content of sodium hydroxide in the white mud suspension, the concentration of calcium chloride is 1.7mol/L, slowly stirring and reacting for 0.5h, heating to 80 ℃ to obtain a first mixed solution, and the Baume degree of the first mixed solution is 20 Be for later use;
s2: transferring the first mixed solution into a reaction kettle, adding a calcium hydroxide suspension preheated to 80 ℃, wherein the content of hydrochloric acid insoluble matters in the calcium hydroxide is below 0.5%, the purity of the calcium hydroxide is above 98%, the Baume degree of the calcium hydroxide suspension is 15 Be, the added amount is 3% of the mass of the white mud, and carrying out constant-temperature reaction for 1.5 hours under the condition of 80 ℃, so as to obtain a second mixed solution after the constant-temperature reaction is finished for later use;
s3: adding a calcium chloride solution into the second mixed solution in the step S2, wherein the concentration of calcium chloride is 1.7mol/L, the amount of calcium chloride is 70% of the mass of calcium hydroxide in the step S2, stirring and reacting for 0.5h, transferring the slurry to a carbonization tower, and introducing CO 2 The carbon dioxide content is more than 98%, the flow is more than 245g/min, the stirring speed is 50r/min, the carbonization is carried out for 0.5h, and the pH of the slurry is less than 8.5, thus obtaining the modified calcium carbonate.
Example 2 method two of the additive Process for producing modified calcium carbonate
S1: adding a calcium chloride solution into the white mud suspension, wherein the content of calcium chloride in the calcium chloride solution is 1.35 times of the content of sodium hydroxide in the white mud suspension, the concentration of calcium chloride is 1.8mol/L, slowly stirring and reacting for 0.5h, heating to 85 ℃ to obtain a first mixed solution, and the Baume degree of the first mixed solution is 20 Be for later use;
s2: transferring the first mixed solution into a reaction kettle, adding a calcium hydroxide suspension preheated to 85 ℃, wherein the content of insoluble substances in the calcium hydroxide is below 0.5%, the purity of the calcium hydroxide is above 98%, the Baume degree of the calcium hydroxide suspension is 15 Be, the added amount is 4% of the mass of the white mud, reacting at a constant temperature for 2 hours under the condition of 85 ℃, after finishing the constant temperature reaction, slowly stirring and cooling to 20-35 ℃ to obtain a second mixed solution for standby;
s3: adding the second mixed solution after the step S2Adding a calcium chloride solution, wherein the concentration of calcium chloride is 1.8mol/L, the amount of calcium chloride is 80% of the mass of calcium hydroxide in the step S2, stirring and reacting for 1h, transferring the slurry to a carbonization tower, and introducing CO 2 The carbon dioxide content is more than 98%, the flow is more than 245g/min, the stirring speed is 50r/min, the carbonization is carried out for 1h, and the pH of the slurry is less than 8.5, thus obtaining the modified calcium carbonate.
Example 3 method three of additive Process for producing modified calcium carbonate
S1: adding a calcium chloride solution into the white mud suspension, wherein the content of calcium chloride in the calcium chloride solution is 1.38 times of the content of sodium hydroxide in the white mud suspension, the concentration of calcium chloride is 1.9mol/L, slowly stirring and reacting for 1h, heating to 90 ℃ to obtain a first mixed solution, and the Baume degree of the first mixed solution is 20 DEG Be for later use;
s2: transferring the first mixed solution into a reaction kettle, adding a calcium hydroxide suspension preheated to 90 ℃, wherein the content of hydrochloric acid insoluble matters in the calcium hydroxide is below 0.5%, the purity of the calcium hydroxide is above 98%, the Baume degree of the calcium hydroxide suspension is 15 Bee, the added amount is 5% of the mass of the white mud, and carrying out constant-temperature reaction for 2.5 hours under the condition of 90 ℃, so as to obtain a second mixed solution after the constant-temperature reaction is finished for later use;
s3: adding a calcium chloride solution into the second mixed solution in the step S2, wherein the concentration of calcium chloride is 1.9mol/L, the amount of calcium chloride is 90% of the mass of calcium hydroxide in the step S2, stirring and reacting for 1h, transferring the slurry to a carbonization tower, and introducing CO 2 The carbon dioxide content is more than 98%, the flow is more than 245g/min, the stirring speed is 50r/min, the carbonization is carried out for 1h, and the pH of the slurry is less than 8.5, thus obtaining the modified calcium carbonate.
In the above embodiments, the modified calcium carbonate with better quality can be prepared, and the problems mentioned in the application can be solved. In the above examples, the modified calcium carbonate prepared in example 2 has the best performance and is compared with the performance of the calcium carbonate prepared by the existing papermaking white mud, as shown in table 1:
from table 1, it is clear that the modified calcium carbonate having a lower content of hydrochloric acid insoluble matter can be obtained by the treatment of the present method, and the whiteness of the modified calcium carbonate is higher, the sedimentation volume and the yield are larger, i.e., more modified calcium carbonate can be produced under the same volume of liquid, and the yield is improved. By means of the pH (10% suspended matter), it is demonstrated that the method can also lower the pH of the solution, which is beneficial to subsequent wastewater treatment.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention. The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (8)
1. A method for producing modified calcium carbonate by an auxiliary agent method, which is characterized by comprising the following steps:
s1: adding a calcium chloride solution into the white mud suspension, stirring and reacting for 0.5-1h, and heating to 80-90 ℃ to obtain a first mixed solution for later use;
s2: transferring the first mixed solution into a reaction kettle, adding calcium hydroxide suspension, reacting at constant temperature for 1.5-2.5h, and stirring after the constant temperature reaction is finished to obtain a second mixed solution for later use;
s3: and (3) adding a calcium chloride solution into the second mixed solution obtained in the step S2, stirring and reacting for 0.5-1h, and then introducing carbon dioxide for carbonization to obtain the modified calcium carbonate.
2. The method for producing modified calcium carbonate according to claim 1, wherein in the step S1, the concentration of the calcium chloride solution is 1.7-1.9mol/L, and the calcium chloride content in the calcium chloride solution is 1.3-1.38 times of the sodium hydroxide content in the white mud suspension.
3. The method for producing modified calcium carbonate according to claim 1, wherein in the step S2, when the calcium hydroxide suspension is added, the preheating is required, the preheating temperature is 80-90 ℃, and the baume degree of the calcium hydroxide suspension is 14-16 °.
4. A method for producing modified calcium carbonate according to claim 3, wherein the content of hydrochloric acid insoluble in calcium hydroxide is 0.5% or less and the purity of calcium hydroxide is 98% or more.
5. The method for producing modified calcium carbonate according to claim 4, wherein in the step S2, the calcium hydroxide suspension is added in an amount of 3 to 5% by mass of the white mud.
6. The method for producing modified calcium carbonate according to claim 2, wherein in the step S3, calcium chloride is added in an amount of 70 to 90% by mass of calcium hydroxide in the step S2.
7. The method for producing modified calcium carbonate according to claim 1, wherein in the step S3, the specific steps of carbonization are as follows: after the slurry is moved to a carbonization tower, CO is introduced 2 The stirring speed is 50r/min, the carbonization is 0.5 to 1H, and the pH of the slurry is less than 8.5.
8. The method for producing modified calcium carbonate according to claim 7, wherein the carbon dioxide content is more than 98% and the flow rate is more than 245g/min.
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| CN105417568A (en) * | 2015-12-03 | 2016-03-23 | 浙江理工大学 | Method for preparing lime mud calcium carbonate from non-wood-pulp-alkali recovered green liquor through low-temperature three-step causticization |
| CN108101089A (en) * | 2017-12-25 | 2018-06-01 | 绵阳市荣坤科技有限公司 | A kind of method that high-quality calcium carbonate albarium is prepared using paper white sludge |
| CN108793215A (en) * | 2018-05-30 | 2018-11-13 | 福建鼎盛元环保科技有限公司 | A kind of production technology producing whiting using pulping and paper-making white clay |
| CN109704383A (en) * | 2018-12-30 | 2019-05-03 | 广西碳酸钙产业化工程院有限公司 | Cube crystalline form calcium carbonate, preparation method and applications |
| CN111333095A (en) * | 2020-03-10 | 2020-06-26 | 广东玉峰粉体材料股份有限公司 | Method for producing superfine calcium carbonate from industrial alkaline residue white mud |
| CN114956145A (en) * | 2022-06-10 | 2022-08-30 | 重庆碳福森环保科技有限公司 | Method for preparing light calcium carbonate from papermaking white mud |
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