CN102674425B - Production technique of nano calcium carbonate by normal temperature method - Google Patents
Production technique of nano calcium carbonate by normal temperature method Download PDFInfo
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- CN102674425B CN102674425B CN 201210158716 CN201210158716A CN102674425B CN 102674425 B CN102674425 B CN 102674425B CN 201210158716 CN201210158716 CN 201210158716 CN 201210158716 A CN201210158716 A CN 201210158716A CN 102674425 B CN102674425 B CN 102674425B
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 98
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000013078 crystal Substances 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000010000 carbonizing Methods 0.000 claims abstract description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 29
- 238000003763 carbonization Methods 0.000 claims description 27
- 230000015572 biosynthetic process Effects 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 238000007670 refining Methods 0.000 claims description 15
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
- 238000000746 purification Methods 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000003112 inhibitor Substances 0.000 claims description 11
- 239000012065 filter cake Substances 0.000 claims description 10
- 235000013336 milk Nutrition 0.000 claims description 10
- 239000008267 milk Substances 0.000 claims description 10
- 210000004080 milk Anatomy 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 230000005587 bubbling Effects 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000012847 fine chemical Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000003889 chemical engineering Methods 0.000 abstract 1
- 239000003973 paint Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 5
- MOMKYJPSVWEWPM-UHFFFAOYSA-N 4-(chloromethyl)-2-(4-methylphenyl)-1,3-thiazole Chemical compound C1=CC(C)=CC=C1C1=NC(CCl)=CS1 MOMKYJPSVWEWPM-UHFFFAOYSA-N 0.000 description 3
- 238000005255 carburizing Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 235000019983 sodium metaphosphate Nutrition 0.000 description 3
- 239000001488 sodium phosphate Substances 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical group [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 3
- 235000019801 trisodium phosphate Nutrition 0.000 description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 3
- 229960001763 zinc sulfate Drugs 0.000 description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
The invention discloses a production technique of nano calcium carbonate by a normal temperature method, belonging to the technical field of fine chemical engineering. The production technique comprises the following steps: proportioning, carbonizing, treating, dehydrating, primary drying, secondary drying and depolymerizing. The invention has the characteristics of low equipment investment, low energy consumption, low production cost and the like, can implement production under normal temperature conditions, and can control the particle size and crystal form. The nano calcium carbonate produced by the technique disclosed by the invention can be used as a filling material in plastics industry, rubber industry, paint industry, paper manufacturing industry, ink industry, adhesive industry and other industries.
Description
Technical field
The present invention relates to the fine chemical technology field, particularly a kind of normal temperature method nanometer grade calcium carbonate production technique.
Background technology
Nanometer grade calcium carbonate claims again super fine calcium carbonate, is mainly used in plastics industry, rubber industry, coatings industry, paper industry, printing ink industry and sizing agent industry etc.The production method of nanometer grade calcium carbonate is mainly carborization, the main mode of production of nanometer grade calcium carbonate carbonization at present is low-temperature freezing, as: band stirs bubbling carborization, high-gravity carbonation method etc., these production technique all must be equipped with the cryogenic freezing device, thereby, its facility investment is larger, and energy consumption and production cost are all very high.
Summary of the invention
The purpose of this invention is to provide that a kind of facility investment is few, energy consumption and production cost is lower, can produce under normal temperature condition, and can control particle diameter, also can control the nanometer grade calcium carbonate production technique of crystal formation.
The technical solution used in the present invention is a kind of normal temperature method nanometer grade calcium carbonate production technique of invention, and its technical process is:
A, batching: aqua calcis, through the suspension separator, is removed to impurity, and add water and adjust calcium oxide concentration content in solution at 6-10%, become refining aqua calcis, standby;
B, carbonization: standby refining aqua calcis is placed in to carbonating tower, pass into carbon dioxide after purification (generally, carbonic acid gas volume content wherein is 20-40%) carry out bubbling carbonizing, and interpolation accounts for crystal formation directed agents and the crystal formation inhibitor of calcium oxide weight 1-3% in refining aqua calcis, carry out carbonizing treatment at 20-65 ℃ of temperature, when reaching 6.5-7.5, the pH value in solution can stop carbonization, nano-calcium carbonate milk sap after the collection carbonization, standby;
Crystal formation directed agents used and crystal formation inhibitor are a kind of in vitriol, phosphoric acid, phosphoric acid salt, citric acid, lactic acid, polyacrylic acid, sodium polyacrylate, starch, Mierocrystalline cellulose or two or more or all; When adopting two or more or all the time, the proportioning of each component can adopt single-candidate, also can adopt other ratio;
C, processing: standby nano-calcium carbonate milk sap is heated to 60-80 ℃, adds the sodium stearate that accounts for calcium oxide weight 2-2.5%, carry out surface treatment, become and process the nano-calcium carbonate mixed solution, standby;
D, dehydration: standby processing nano-calcium carbonate mixed solution is carried out to processed, allow its water content be down to 40-60%, collect the nano-calcium carbonate filter cake after dewatering, standby;
E, one-level drying: standby nano-calcium carbonate filter cake is carried out to drying for the first time, allow its water content be down to 10-20%, become just dry nano-calcium carbonate, standby;
F, secondary drying: standby first dry nano-calcium carbonate is carried out to the redrying processing, allow its water content be down to below 0.5%, become the work in-process nano-calcium carbonate, standby;
G, depolymerization: standby work in-process nano-calcium carbonate is pulverized to depolymerization, become nanometer grade calcium carbonate.
In the carburising step of B step, the interpolation time of crystal formation directed agents and crystal formation inhibitor, for before passing into purification of carbon dioxide gas or when passing into purification of carbon dioxide gas or pass into the carbonization mid-term after purification of carbon dioxide gas.
In the carburising step of B step, its carbonization temperature is 35-55 ℃.
In the carburising step of B step, its carbonization temperature is 45 ℃.
In the carburising step of B step, described vitriol is calcium sulfate or zinc sulfate, and described phosphoric acid salt is trisodium phosphate or sodium-metaphosphate.
Normal temperature method nanometer grade calcium carbonate production technique of the present invention, owing to having selected suitable crystal formation directed agents and crystal formation inhibitor, passivation its susceptibility to carbonization temperature, make its carbonization temperature can be in the normal temperature scope; Simultaneously, as required, the crystal formation directed agents, the inhibitor that add different amounts can make the particle diameter of product be controlled at the 20-100 nanometer, and the crystal formation of selecting different crystal formation directed agents and inhibitor can control product is cubes, spherule, mixed crystal type; In addition, abandoned the freezing process in the traditional technology, so, both reduced the investment of refrigerating apparatus, also reduced the energy consumption that the operation because of refrigerating apparatus consumes, thereby, its production cost reduced.
Embodiment:
Below in conjunction with embodiment, the present invention is described further.Following explanation is the mode exemplified, but protection scope of the present invention is not limited to this.
Embodiment mono-:
The technical process of the present embodiment is:
A, batching: aqua calcis, through the suspension separator, is removed to impurity, and add water and adjust calcium oxide concentration content in solution 10%, become refining aqua calcis, standby;
B, carbonization: standby refining aqua calcis is placed in to carbonating tower, the carbon dioxide passed into after purification carries out bubbling carbonizing, and (both proportionings are single-candidate to add the zinc sulfate account for calcium oxide weight 3% in refining aqua calcis and trisodium phosphate mixture, also can be other ratio) as crystal formation directed agents and crystal formation inhibitor, carry out initial carbonizing treatment (in whole carbonization process under the normal temperature scope of 20-65 ℃ of temperature, the heat that carburizing reagent produces, the temperature of solution although can raise, but still do not need to take cooling measure); When reaching 7.0, the pH value in solution can stop carbonization, the nano-calcium carbonate milk sap after the collection carbonization, and standby; The interpolation time of zinc sulfate and trisodium phosphate be pass into purification of carbon dioxide gas before;
C, processing: standby nano-calcium carbonate milk sap is heated to 70 degree, adds the sodium stearate that accounts for calcium oxide weight 2% to carry out surface treatment, become and process the nano-calcium carbonate mixed solution, standby;
D, dehydration: standby processing nano-calcium carbonate mixed solution is carried out to processed (can adopt plate-and-frame filter press or other dehydration equipment), allow its water content be down to 40%, collect the nano-calcium carbonate filter cake after dewatering, standby;
E, one-level drying: standby nano-calcium carbonate filter cake is carried out to dry (adopting duplex drying machine or chain-plate type drying machine) for the first time, allow its water content be down to 20%, become just dry nano-calcium carbonate, standby;
F, secondary drying: standby first dry nano-calcium carbonate is carried out to redrying processing (can adopt board-like drying machine or flash dryer or other drying plant), allow its water content be down to below 0.5%, become the work in-process nano-calcium carbonate, standby;
G, depolymerization: standby work in-process nano-calcium carbonate is pulverized to depolymerization (can adopt high speed powder mill or other disintegrating apparatus), become nanometer grade calcium carbonate.
The nanometer grade calcium carbonate product that this scheme is produced, after testing, its crystal formation is spherule, median size is the 40-80 nanometer.
Embodiment bis-:
The technical process of the present embodiment is:
A, batching: aqua calcis, through the suspension separator, is removed to impurity, and add water and adjust calcium oxide concentration content in solution 8%, become refining aqua calcis, standby;
B, carbonization: standby refining aqua calcis is placed in to carbonating tower, the carbon dioxide passed into after purification carries out bubbling carbonizing, and (both proportionings are single-candidate to add the calcium sulfate account for calcium oxide weight 1% in refining aqua calcis and sodium polyacrylate mixture, also can be other ratio) as crystal formation directed agents and crystal formation inhibitor, carry out initial carbonizing treatment (in whole carbonization process under the normal temperature scope of 20-65 ℃ of temperature, the heat that carburizing reagent produces, the temperature of solution although can raise, but still do not need to take cooling measure); When reaching 7.0, the pH value in solution can stop carbonization, the nano-calcium carbonate milk sap after the collection carbonization, and standby; The interpolation time of calcium sulfate and sodium polyacrylate is when passing into purification of carbon dioxide gas;
C, processing: standby nano-calcium carbonate milk sap is heated to 70 degree, adds the sodium stearate that accounts for calcium oxide weight 2% to carry out surface treatment, become and process the nano-calcium carbonate mixed solution, standby;
D, dehydration: standby processing nano-calcium carbonate mixed solution is carried out to processed (can adopt plate-and-frame filter press or other dehydration equipment), allow its water content be down to 50%, collect the nano-calcium carbonate filter cake after dewatering, standby;
E, one-level drying: standby nano-calcium carbonate filter cake is carried out to dry (adopting duplex drying machine or chain-plate type drying machine) for the first time, allow its water content be down to 15%, become just dry nano-calcium carbonate, standby;
F, secondary drying: standby first dry nano-calcium carbonate is carried out to redrying processing (can adopt board-like drying machine or flash dryer or other drying plant), allow its water content be down to below 0.5%, become the work in-process nano-calcium carbonate, standby;
G, depolymerization: standby work in-process nano-calcium carbonate is pulverized to depolymerization (can adopt high speed powder mill or other disintegrating apparatus), become nanometer grade calcium carbonate.
The nanometer grade calcium carbonate product that this scheme is produced, after testing, its crystal formation is mixed crystal shape, median size is the 80-100 nanometer.
Embodiment tri-:
The technical process of the present embodiment is:
A, batching: aqua calcis, through the suspension separator, is removed to impurity, and add water and adjust calcium oxide concentration content in solution 6%, become refining aqua calcis, standby;
B, carbonization: standby refining aqua calcis is placed in to carbonating tower, the carbon dioxide passed into after purification carries out bubbling carbonizing, and (both proportionings are single-candidate to add the sodium-metaphosphate account for calcium oxide weight 1% in refining aqua calcis and polyacrylic acid mixture, also can be other ratio) as crystal formation directed agents and crystal formation inhibitor, carry out initial carbonizing treatment (in whole carbonization process under the normal temperature scope of 20-65 ℃ of temperature, the heat that carburizing reagent produces, the temperature of solution although can raise, but still do not need to take cooling measure); Can stop carbonization when the pH value in solution reaches 7.0, collect the nano-calcium carbonate milk sap after carbonization, standby: sodium-metaphosphate and polyacrylic interpolation time are the carbonization mid-term passed into after purification of carbon dioxide gas, that is: the centre in whole carbon period;
C, processing: standby nano-calcium carbonate milk sap is heated to 70 degree, adds the sodium stearate that accounts for calcium oxide weight 2.5% to carry out surface treatment, become and process the nano-calcium carbonate mixed solution, standby;
D, dehydration: standby processing nano-calcium carbonate mixed solution is carried out to processed (can adopt plate-and-frame filter press or other dehydration equipment), allow its water content be down to 60%, collect the nano-calcium carbonate filter cake after dewatering, standby;
E, one-level drying: standby nano-calcium carbonate filter cake is carried out to dry (adopting duplex drying machine or chain-plate type drying machine) for the first time, allow its water content be down to 10%, become just dry nano-calcium carbonate, standby;
F, secondary drying: standby first dry nano-calcium carbonate is carried out to redrying processing (can adopt board-like drying machine or flash dryer or other drying plant), allow its water content be down to below 0.5%, become the work in-process nano-calcium carbonate, standby;
G, depolymerization: standby work in-process nano-calcium carbonate is pulverized to depolymerization (can adopt high speed powder mill or other disintegrating apparatus), become nanometer grade calcium carbonate.
The nanometer grade calcium carbonate product that this scheme is produced, after testing, its crystal formation is cubes, median size is the 60-80 nanometer.
Apply the nanometer grade calcium carbonate that the present invention produces, can be used as the packing material of the industries such as plastics industry, rubber industry, coatings industry, paper industry, printing ink industry and sizing agent industry.
Claims (3)
1. a normal temperature method nanometer grade calcium carbonate production technique is characterized in that technical process is:
A, batching: aqua calcis, through the suspension separator, is removed to impurity, and add water and adjust calcium oxide concentration content in solution at 6-10%, become refining aqua calcis, standby;
B, carbonization: standby refining aqua calcis is placed in to carbonating tower, the carbon dioxide passed into after purification carries out bubbling carbonizing, and interpolation accounts for the mixture be made into by single-candidate by calcium sulfate and sodium polyacrylate of calcium oxide weight 1-3% in refining aqua calcis as crystal formation directed agents and crystal formation inhibitor, carry out carbonizing treatment at 45-65 ℃ of temperature, when reaching 6.5-7.0, the pH value in solution can stop carbonization, nano-calcium carbonate milk sap after the collection carbonization, standby;
C, processing: standby nano-calcium carbonate milk sap is heated to 60-80 ℃, adds the sodium stearate that accounts for calcium oxide weight 2-2.5% to carry out surface treatment, become and process the nano-calcium carbonate mixed solution, standby;
D, dehydration: standby processing nano-calcium carbonate mixed solution is carried out to processed, allow its water content be down to 40-60%, collect the nano-calcium carbonate filter cake after dewatering, standby;
E, one-level drying: standby nano-calcium carbonate filter cake is carried out to drying for the first time, allow its water content be down to 10-20%, become just dry nano-calcium carbonate, standby;
F, secondary drying: standby first dry nano-calcium carbonate is carried out to the redrying processing, allow its water content be down to below 0.5%, become the work in-process nano-calcium carbonate, standby;
G, depolymerization: standby work in-process nano-calcium carbonate is pulverized to depolymerization, become nanometer grade calcium carbonate.
2. normal temperature method nanometer grade calcium carbonate production technique according to claim 1, it is characterized in that: in the carburising step of B step, the interpolation time of crystal formation directed agents and crystal formation inhibitor, for passing into before purification of carbon dioxide gas or when passing into purification of carbon dioxide gas or pass into the carbonization mid-term after purification of carbon dioxide gas.
3. normal temperature method nanometer grade calcium carbonate production technique according to claim 1 and 2 is characterized in that: in the carburising step of B step, its carbonization temperature is 45 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
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| CN104418376B (en) * | 2013-09-03 | 2016-08-17 | 井陉县京华钙业有限公司 | A kind of production technology of winnofil |
| CN103950965B (en) * | 2014-04-29 | 2016-07-13 | 东华大学 | A kind of method using kind of crystallization to prepare different size nano-calcium carbonate |
| CN103950964B (en) * | 2014-04-29 | 2018-02-23 | 东华大学 | It is a kind of to prepare method of the different radial directions than nano-calcium carbonate particles by adjusting carbonization number |
| ES2701827T3 (en) * | 2014-07-11 | 2019-02-26 | Omya Int Ag | Drying process |
| CN104085896B (en) * | 2014-07-18 | 2015-12-09 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | The preparation method of active calcium silicate |
| CN104389025B (en) * | 2014-10-17 | 2017-03-22 | 东北大学 | Method for enhancing hydrophobicity of calcium sulfate whisker |
| CN105060330B (en) * | 2015-09-14 | 2018-04-06 | 广西大学 | A kind of preparation method of spherical calcium carbonate crystal |
| CN105329928A (en) * | 2015-12-10 | 2016-02-17 | 湖南化工职业技术学院 | Activation method for nanometer calcium carbonate |
| CN106517285B (en) * | 2016-11-21 | 2017-11-14 | 广西华纳新材料科技有限公司 | A kind of preparation method of rod-like nano calcium carbonate |
| CN109592702A (en) * | 2018-12-29 | 2019-04-09 | 福建贝思科电子材料股份有限公司 | A kind of nano-scale carbon hydrochlorate and preparation method thereof |
| CN109809457B (en) * | 2019-03-21 | 2021-07-09 | 广西碳酸钙产业化工程院有限公司 | Regular spherical calcium carbonate and preparation process thereof |
| CN110817921A (en) * | 2019-10-24 | 2020-02-21 | 湖南金箭新材料科技有限公司 | Nano calcium carbonate aging, homogenizing and surface treatment integrated production process |
| CN115443252A (en) | 2020-02-25 | 2022-12-06 | 艾瑞莱克公司 | Method and system for treating lime to form vaterite |
| CN111717928A (en) * | 2020-04-24 | 2020-09-29 | 广西科学院 | Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology |
| CN111453754A (en) * | 2020-04-28 | 2020-07-28 | 广西夏阳环保科技有限公司 | Preparation method of high-purity and high-activity nano calcium carbonate |
| KR20230030619A (en) | 2020-06-30 | 2023-03-06 | 아렐락, 인크. | Methods and systems for forming vaterite from calcined limestone using an electric kiln |
| CN113019664A (en) * | 2021-04-23 | 2021-06-25 | 山东宇信纳米科技有限公司 | Ultralow-moisture nano calcium carbonate drying and depolymerization system and application method thereof |
| CN115353138A (en) * | 2022-08-10 | 2022-11-18 | 中南大学 | Preparation method of food-grade light calcium carbonate |
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| JP4245712B2 (en) * | 1998-12-18 | 2009-04-02 | 奥多摩工業株式会社 | Light calcium carbonate using papermaking sludge and its production method |
| FI120032B (en) * | 2004-07-13 | 2009-06-15 | Fp Pigments Oy | Method and apparatus for making a calcium carbonate product, the product and its use |
| CN101108741A (en) * | 2006-07-21 | 2008-01-23 | 北京市化工建材厂 | Industrial process for preparing nm-class active calcium carbonate |
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| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
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