CN108083314A - A kind of preparation method of rice-shaped precipitated calcium carbonate - Google Patents
A kind of preparation method of rice-shaped precipitated calcium carbonate Download PDFInfo
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- 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
- C01F11/183—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- C01F11/00—Compounds of calcium, strontium, or barium
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/021—Calcium carbonates
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
Abstract
The invention discloses a kind of preparation methods of rice-shaped precipitated calcium carbonate, lime stone is calcined with natural gas, after adding in digestion water completion digestion reaction, it sieved, cleaned, be aged, it adds in chemical additives and is passed through limekiln kiln gas and be carbonized, it is then pumped into homogenizing tank and is aged again, and be passed through purification, cooling, the secondary carburizing reagent of compressed limekiln kiln gas progress, calcium carbonate serosity is made；After modifying agent is added in into calcium carbonate serosity and is stirred, filter-press dehydration is carried out, dries, be crushed and classified, that is, rice-shaped precipitated calcium carbonate is made；The precipitated calcium carbonate crystal form prepared by the present invention is rice-shaped, and major diameter is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is 20~22m2/ g, draw ratio is small, and specific surface area is high, good dispersion, in the manufacture available for food, cosmetics etc., and it is simple for process feasible, it is at low cost, it is cheap, there is preferable economic benefit.
Description
Technical field
The present invention relates to precipitated calcium carbonate preparing technical field more particularly to a kind of preparation sides of rice-shaped precipitated calcium carbonate
Method.
Background technology
Calcium carbonate is the novel inorganic filler that a kind of dosage is maximum, purposes is most wide, since raw material is wide, price is low, whiteness is high,
It is widely used as rubber, plastics, papermaking, sealant, coating, electric wire, cable, ink, welding rod, organic synthesis, metallurgy, glass
The filler and additive of the industries such as glass, asbestos industry, medicine, food, daily use chemicals, feed are white powder material.
Calcium carbonate is different according to production method, is divided into two major classes：With calcite, marble, chalk, shell, lime stone etc.
Attach most importance to quality calcium carbonate for the product that raw material is produced through mechanical crushing and extra-fine grinding etc., represented with GCC；Using lime stone as raw material
It is known as precipitated calcium carbonate through product made from calcining, digest, be carbonized and post-processing, is represented with PCC；Whether modification according to its surface
Be divided into nonactive calcium carbonate and activated Calcium carbonate, fine particle calcium carbonate (PCC) and coarse whiting (GCC) it is all active with it is nonactive.Calcium activated according to
The difference of modification mode is divided into dry reactive and wet method activity, and wet method activity refers to the product for carrying out activation process in the solution,
Dry reactive refers to the product that surface activation process is carried out using physical method；According to its purposes can be divided into rubber PCC,
Plastics PCC, paper grade (stock) PCC, toothpaste PCC, medicinal PCC etc..
In recent years, with domestic miniaturization and the progress of process for treating surface, make PCC products to customizations, become more meticulous, work(
Direction can be changed to develop, even more expanded application field, PCC dosages are increasing.There are many kinds of the crystal shapes of PCC, such as vertical
Cube, spindle, spherical shape, chain lock shape, amorphous etc., different crystal forms has different purposes, separately below to various crystal shapes
The calcium carbonate of shape carries out detailed analysis explanation.
First, calcite
There are two ways to preparing cubic ultra-fine calcium carbonate both at home and abroad, a kind of is calcium hydroxide suspension continuous feed
Multilevel spray carbonization, another kind are the interval carbonizatin methods of calcium hydroxide suspension.Gu Yanfang et al. prepares nano-sized carbon at " carbonizatin method "
During sour calcium, a certain amount of additive is added in the particle growth stage, controls different reaction conditions, available can be excellent
Good Cubic nano-particle (grain size is 10~100nm), grain size is fusiform when being more than 100 nanometers.
2nd, spindle calcium carbonate
The method is that calcium hydroxide suspension progress wet type first is ground activation process before carbonization, then carries out carburizing reagent
Product cut size obtained is 0.1~1.0 micron.And not generating secondary aggegation in the drying process, dispersiveness is very good.
3rd, spherical calcium carbonate superfine powder
Usually it is made by calcium salt and carbonate in concentrated alkaline solution through low-temp reaction.Because the product it is unstable thus
Some necessary conditions are strictly controlled in preparation process.
4th, chain lock shape calcium carbonate
Chain lock shape calcium carbonate is combined into certain direction by several to tens particles.The product can avoid aggegation existing
As there is good dispersiveness, be added in matrix and form stereochemical structure, be greatly improved reinforcing effect.Its average grain diameter is general
For 0.01~0.1 micron, draw ratio is 5~50.
5th, amorphous calcium carbonate
Amorphous calcium carbonate, that is, noncrystalline calcium carbonate is a kind of new product.Compared with previous crystalline product, specific surface
Product is up to 600m220 times of/g, about previous product；1.6~2.5g/m of proportion3, it is slightly lighter than mill run, it is water-soluble fabulous, be
30 times of mill run have broken the concept that calcium carbonate is refractory to water.
6th, rice-shaped calcium carbonate
Rice-shaped calcium carbonate is the emerging product studied in recent years, is gained the name due to its appearance is similar with the grain of rice.With it is common
Spindle calcium carbonate is compared, and rice-shaped calcium carbonate has smaller draw ratio and higher specific surface area, and dispersiveness more preferably, is being eaten
There is huge application potential in product and cosmetics.But in technology of preparing disclosed at present, the rice-shaped calcium carbonate that is obtained
Grain size is larger, and specific surface is smaller, actually a kind of only upgrading substitute of spindle calcium carbonate, and it is even more impossible to play it using work(
Effect.
In conclusion in the precipitated calcium carbonate fabricating technology announced at present, it there is no and prepare ultra-fine rice-shaped carbonic acid
The relevant report of calcium especially disclosure satisfy that the rice-shaped calcium carbonate of absorbability requirement in food and cosmetic industry.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of rice-shaped lightweight carbon that can be applied in food, cosmetics
The preparation method of sour calcium.
In order to solve the above technical problems, the technical scheme is that：A kind of preparation method of rice-shaped precipitated calcium carbonate,
Comprise the following steps,
It Step 1: taking lime stone, is calcined with natural gas, calcium oxide is made；
Step 2: by calcium oxide with digesting water in mass ratio 1:3~1:6 proportioning is mixed, and is inserted and is disappeared after mixing
Change in kettle and carry out digestion reaction, digestion reaction finishes the vibrating screen through 300~400 mesh and sieved, and hydroxide is made after removal of impurities
Calcium refining, calcium hydroxide refining is aged in aging tank 40 it is small when more than；
Step 3: the calcium hydroxide refining concentration after ageing is adjusted to 1~1.5mol/L, lime stone butt weight is added in
0.1~0.5% chemical additives, temperature are adjusted to 30~40 DEG C；
It is carbonized Step 4: prepared calcium hydroxide refining in step 3 is delivered in carbonization kettle, makes carbonization kettle
Fill factor for 0.80~0.85, be passed through purification, cooling, compressed limekiln kiln gas carry out carburizing reagent, kiln gas flow
For 60~70m3/ min, wherein carbon dioxide volume content are 30~35%, stop carbon when reaction system PH is 6.5~7.5
Change；
Step 5: by the calcium hydroxide refining after carbonization be pumped into homogenizing tank ageing 6~12 it is small when, and be passed through purification, cold
But, compressed limekiln kiln gas carries out secondary carburizing reagent, and kiln gas flow is 10~20m3/ min, wherein carbon dioxide volume
Content is 30~35%, stops carbonization when reaction system PH is 6.5~7.5, calcium carbonate serosity is made；
Step 6: add in the modifying agent of lime stone butt weight 3~4% into calcium carbonate serosity, stirring is warming up to 80~
It 90 DEG C, stirs 30~60 minutes；
Step 7: the slurries of step 6 to be carried out to filter-press dehydration successively, dries, be crushed and classified, that is, it is light that rice-shaped is made
Matter calcium carbonate, the major diameter of the rice-shaped precipitated calcium carbonate is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is
20~22m2/g。
As preferred technical solution, the appearance and size of the lime stone is 10~18cm, and purity is contained with the percentage of CaCO3
Gauge >=99.0%, whiteness >=95.0.
As preferred technical solution, the pH range of the digestion water is 6.0~8.0, and the digestion water uses temperature
It spends for 50~60 DEG C.
As preferred technical solution, the chemical additives include times of ethylenediamine, diethylenetriamine, triethylene tetramine
Meaning proportioning mixture.
As the improvement to above-mentioned technical proposal, the modifying agent is the mixing of food grade glycerin monoesters and diglyceride
The mixed proportion of object, the monoglyceride and the diglyceride is 1：3~1：5.
By adopting the above-described technical solution, the beneficial effects of the invention are as follows：The precipitated calcium carbonate prepared by the present invention
Crystal form is rice-shaped, and major diameter is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is 20~22m2/ g, draw ratio
Small, specific surface area is high, good dispersion, in the manufacture available for food, cosmetics etc., and simple for process feasible, at low cost, price
Cheaply, there is preferable economic benefit.
Description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the electron micrograph for the rice-shaped precipitated calcium carbonate that the embodiment of the present invention one produces.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.In the following detailed description, only explanation is passed through
Mode describes some exemplary embodiments of the present invention.Undoubtedly, those of ordinary skill in the art will recognize,
In the case of without departing from the spirit and scope of the present invention, described embodiment can be repaiied with a variety of modes
Just.Therefore, attached drawing and description are regarded as illustrative in nature, and are not intended to limit the scope of the claims.
Embodiment one：
A kind of preparation method of rice-shaped precipitated calcium carbonate, comprises the following steps,
It Step 1: taking lime stone, is calcined with natural gas, calcium oxide is made；
Step 2: by calcium oxide with digesting water in mass ratio 1:5 proportioning is mixed, and is inserted after mixing in digestion kettle
Digestion reaction is carried out, digestion reaction finishes the vibrating screen through 320 mesh and sieved, and calcium hydroxide refining is made after removal of impurities, by hydrogen
Calcium oxide refining be aged in aging tank 50 it is small when；
Step 3: the calcium hydroxide refining concentration after ageing is adjusted to 1.2mol/L, lime stone butt weight is added in
0.4% chemical additives, temperature are adjusted to 30 DEG C；The chemical additives include ethylenediamine, diethylenetriamine, triethylene four
The mixture of amine, ethylenediamine, diethylenetriamine, triethylene tetramine press 2：2：1 ratio mixing.
Step 4: prepared calcium hydroxide refining in step 3 is delivered to 50m3Stainless steel stirring carbonization kettle in into
Row carbonization, the fill factor for making carbonization kettle is 0.80, is passed through purification, cooling, the progress carburizing reagent of compressed limekiln kiln gas,
Kiln gas flow is 60m3/ min, wherein carbon dioxide volume content are 30~32%, stop carbonization when reaction system PH is 7；
Step 5: by the calcium hydroxide refining after carbonization be pumped into homogenizing tank ageing 6 it is small when, and be passed through purification, cooling, pressure
Limekiln kiln gas after contracting carries out secondary carburizing reagent, and kiln gas flow is 10m3/ min, wherein carbon dioxide volume content are 30
~32%, stop carbonization when reaction system PH is 7, calcium carbonate serosity is made；
Step 6: adding in the modifying agent of lime stone butt weight 3.5% into calcium carbonate serosity, stirring is warming up to 80 DEG C,
Stirring 45 minutes；The modifying agent is the mixture of food grade glycerin monoesters and diglyceride, the monoglyceride and described sweet
The mixed proportion of oily dibasic acid esters is 1：4.
Step 7: the slurries of step 6 to be carried out to filter-press dehydration successively, dries, be crushed and classified, that is, it is light that rice-shaped is made
Matter calcium carbonate, the major diameter of the rice-shaped precipitated calcium carbonate is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is
20.15m2/g。
The specific targets of selected lime stone are as shown in table 1 in the present embodiment：
Table 1
It is the electron micrograph of rice-shaped precipitated calcium carbonate made from the present embodiment as shown in Figure 1.
The specific targets of selected digestion water are as shown in table 2 in the present embodiment：
Table 2
Embodiment two：
A kind of preparation method of rice-shaped precipitated calcium carbonate, comprises the following steps,
It Step 1: taking lime stone, is calcined with natural gas, calcium oxide is made；
Step 2: by calcium oxide with digesting water in mass ratio 1:5 proportioning is mixed, and is inserted after mixing in digestion kettle
Digestion reaction is carried out, digestion reaction finishes the vibrating screen through 320 mesh and sieved, and calcium hydroxide refining is made after removal of impurities, by hydrogen
Calcium oxide refining be aged in aging tank 45 it is small when；
Step 3: the calcium hydroxide refining concentration after ageing is adjusted to 1.5mol/L, lime stone butt weight is added in
0.5% chemical additives, temperature are adjusted to 33 DEG C；The chemical additives include ethylenediamine, diethylenetriamine, triethylene four
The mixture of amine, ethylenediamine, diethylenetriamine, triethylene tetramine press 1：1：1 ratio mixing.
Step 4: prepared calcium hydroxide refining in step 3 is delivered to 50m3Stainless steel stirring carbonization kettle in into
Row carbonization, the fill factor for making carbonization kettle is 0.80, is passed through purification, cooling, the progress carburizing reagent of compressed limekiln kiln gas,
Kiln gas flow is 65m3/ min, wherein carbon dioxide volume content are 30~32%, stop carbonization when reaction system PH is 7；
Step 5: by the calcium hydroxide refining after carbonization be pumped into homogenizing tank ageing 12 it is small when, and be passed through purification, cooling,
Compressed limekiln kiln gas carries out secondary carburizing reagent, and kiln gas flow is 15m3/ min, wherein carbon dioxide volume content are
30~32%, stop carbonization when reaction system PH is 7, calcium carbonate serosity is made；
Step 6: adding in the modifying agent of lime stone butt weight 4% into calcium carbonate serosity, stirring is warming up to 85 DEG C, stirs
It mixes 50 minutes；The modifying agent is the mixture of food grade glycerin monoesters and diglyceride, the monoglyceride and the glycerine
The mixed proportion of dibasic acid esters is 1：3.
Step 7: the slurries of step 6 to be carried out to filter-press dehydration successively, dries, be crushed and classified, that is, it is light that rice-shaped is made
Matter calcium carbonate, the major diameter of the rice-shaped precipitated calcium carbonate is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is
20.37m2/g。
Selected lime stone is similar to embodiment one to the specific targets of the digestion water in the present embodiment.
Embodiment three：
A kind of preparation method of rice-shaped precipitated calcium carbonate, comprises the following steps,
It Step 1: taking lime stone, is calcined with natural gas, calcium oxide is made；
Step 2: by calcium oxide with digesting water in mass ratio 1:5 proportioning is mixed, and is inserted after mixing in digestion kettle
Digestion reaction is carried out, digestion reaction finishes the vibrating screen through 320 mesh and sieved, and calcium hydroxide refining is made after removal of impurities, by hydrogen
Calcium oxide refining be aged in aging tank 60 it is small when；
Step 3: the calcium hydroxide refining concentration after ageing is adjusted to 1mol/L, lime stone butt weight 0.3% is added in
Chemical additives, temperature adjusted to 32 DEG C；The chemical additives include ethylenediamine, diethylenetriamine, triethylene tetramine
Mixture, ethylenediamine, diethylenetriamine, triethylene tetramine press 1：3：2 ratio mixing.
Step 4: prepared calcium hydroxide refining in step 3 is delivered to 50m3Stainless steel stirring carbonization kettle in into
Row carbonization, the fill factor for making carbonization kettle is 0.80, is passed through purification, cooling, the progress carburizing reagent of compressed limekiln kiln gas,
Kiln gas flow is 70m3/ min, wherein carbon dioxide volume content are 30~32%, stop carbonization when reaction system PH is 7；
Step 5: by the calcium hydroxide refining after carbonization be pumped into homogenizing tank ageing 8 it is small when, and be passed through purification, cooling, pressure
Limekiln kiln gas after contracting carries out secondary carburizing reagent, and kiln gas flow is 20m3/ min, wherein carbon dioxide volume content are 30
~32%, stop carbonization when reaction system PH is 7, calcium carbonate serosity is made；
Step 6: adding in the modifying agent of lime stone butt weight 3.8% into calcium carbonate serosity, stirring is warming up to 90 DEG C,
Stirring 30 minutes；The modifying agent is the mixture of food grade glycerin monoesters and diglyceride, the monoglyceride and described sweet
The mixed proportion of oily dibasic acid esters is 1：5.
Step 7: the slurries of step 6 to be carried out to filter-press dehydration successively, dries, be crushed and classified, that is, it is light that rice-shaped is made
Matter calcium carbonate, the major diameter of the rice-shaped precipitated calcium carbonate is 150~200nm, and minor axis is 30~50nm, and BET specific surface area is
21.52m2/g。
Selected lime stone is similar to embodiment one to the specific targets of the digestion water in the present embodiment.Embodiment one, reality
Example two and embodiment three are applied by controlling rice-shaped precipitated calcium carbonate particular technique index prepared by technological parameter as shown in table 3：
Table 3
Be rice-shaped by the precipitated calcium carbonate crystal form for preparing of the present invention, major diameter is 150~200nm, minor axis for 30~
50nm, BET specific surface area are 20~22m2/ g, draw ratio is small, and specific surface area is high, good dispersion, available for food, cosmetics etc.
Manufacture in, it is and simple for process feasible, it is at low cost, it is cheap, have preferable economic benefit.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of preparation method of rice-shaped precipitated calcium carbonate, it is characterised in that：Comprise the following steps,
It Step 1: taking lime stone, is calcined with natural gas, calcium oxide is made；
Step 2: by calcium oxide with digesting water in mass ratio 1:3~1:6 proportioning is mixed, and digestion kettle is inserted after mixing
Middle carry out digestion reaction, digestion reaction finish the vibrating screen through 300~400 mesh and are sieved, and calcium hydroxide essence is made after removal of impurities
Slurry, calcium hydroxide refining is aged in aging tank 40 it is small when more than；
Step 3: the calcium hydroxide refining concentration after ageing is adjusted to 1~1.5mol/L, lime stone butt weight 0.1 is added in
~0.5% chemical additives, temperature are adjusted to 30~40 DEG C；
It is carbonized Step 4: prepared calcium hydroxide refining in step 3 is delivered in carbonization kettle, makes filling out for carbonization kettle
It is 0.80~0.85 to fill coefficient, is passed through purification, cooling, the progress carburizing reagent of compressed limekiln kiln gas, kiln gas flow is 60
~70m3/ min, wherein carbon dioxide volume content are 30~35%, stop carbonization when reaction system PH is 6.5~7.5；
Step 5: by the calcium hydroxide refining after carbonization be pumped into homogenizing tank ageing 6~12 it is small when, and be passed through purification, cooling, pressure
Limekiln kiln gas after contracting carries out secondary carburizing reagent, and kiln gas flow is 10~20m3/ min, wherein carbon dioxide volume content
For 30~35%, stop carbonization when reaction system PH is 6.5~7.5, calcium carbonate serosity is made；
Step 6: adding in the modifying agent of lime stone butt weight 3~4% into calcium carbonate serosity, stirring is warming up to 80~90 DEG C,
Stirring 30~60 minutes；
Step 7: the slurries of step 6 to be carried out to filter-press dehydration successively, dries, be crushed and classified, that is, rice-shaped lightweight carbon is made
Sour calcium, the major diameter of the rice-shaped precipitated calcium carbonate are 150~200nm, and minor axis is 30~50nm, BET specific surface area for 20~
22m2/g。
2. a kind of preparation method of rice-shaped precipitated calcium carbonate as described in claim 1, it is characterised in that：The lime stone
Appearance and size be 10~18cm, purity in terms of the percentage composition of CaCO3 >=99.0%, whiteness >=95.0.
3. a kind of preparation method of rice-shaped precipitated calcium carbonate as described in claim 1, it is characterised in that：The digestion water
PH range is 6.0~8.0, and the temperature in use of the digestion water is 50~60 DEG C.
4. a kind of preparation method of rice-shaped precipitated calcium carbonate as described in claim 1, it is characterised in that：The crystal form control
Agent includes the arbitrary proportioning mixture of ethylenediamine, diethylenetriamine, triethylene tetramine.
5. a kind of preparation method of rice-shaped precipitated calcium carbonate as described in claim 1, it is characterised in that：The modifying agent is
The mixed proportion of the mixture of food grade glycerin monoesters and diglyceride, the monoglyceride and the diglyceride is 1：3~
1：5.
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| CN109796630A (en) * | 2019-01-07 | 2019-05-24 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the twice-modified precipitated calcium carbonate of plastic products |
| CN109796632A (en) * | 2019-01-07 | 2019-05-24 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the high white winnofil of core-shell structure |
| CN109810294A (en) * | 2019-01-07 | 2019-05-28 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the high-end nanometer calcium carbonate of butyl rubber product |
| CN111559752A (en) * | 2020-05-20 | 2020-08-21 | 建德市双超钙业有限公司 | Production method of nano calcium carbonate for PE direct film blowing |
| CN111620359A (en) * | 2020-05-18 | 2020-09-04 | 河南鑫泰钙业有限公司 | Novel ultra-pure ultra-white large-sediment light calcium carbonate and production equipment and method thereof |
| CN111874933A (en) * | 2020-08-14 | 2020-11-03 | 王权广 | Quick preparation process of rice-grain light calcium carbonate |
| CN112209417A (en) * | 2019-08-28 | 2021-01-12 | 浙江天石纳米科技股份有限公司 | Preparation method of light calcium carbonate powder for papermaking coating |
| CN115571903A (en) * | 2022-09-09 | 2023-01-06 | 广东翔龙科技股份有限公司 | Preparation method of high-end calcium carbonate applied to sunscreen cream |
| CN111620359B (en) * | 2020-05-18 | 2024-04-26 | 河南鑫泰钙业有限公司 | Ultra-pure ultra-white heavy body light calcium carbonate and production equipment and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109502622A (en) * | 2018-11-21 | 2019-03-22 | 上海碳酸钙厂有限公司 | A kind of preparation method of medicinal precipitated calcium carbonate |
| CN109796630A (en) * | 2019-01-07 | 2019-05-24 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the twice-modified precipitated calcium carbonate of plastic products |
| CN109796632A (en) * | 2019-01-07 | 2019-05-24 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the high white winnofil of core-shell structure |
| CN109810294A (en) * | 2019-01-07 | 2019-05-28 | 卢氏国嵩莱纳米科技有限公司 | A kind of preparation method of the high-end nanometer calcium carbonate of butyl rubber product |
| CN112209417A (en) * | 2019-08-28 | 2021-01-12 | 浙江天石纳米科技股份有限公司 | Preparation method of light calcium carbonate powder for papermaking coating |
| CN112209417B (en) * | 2019-08-28 | 2022-04-19 | 浙江天石纳米科技股份有限公司 | Preparation method of light calcium carbonate powder for papermaking coating |
| CN111620359A (en) * | 2020-05-18 | 2020-09-04 | 河南鑫泰钙业有限公司 | Novel ultra-pure ultra-white large-sediment light calcium carbonate and production equipment and method thereof |
| CN111620359B (en) * | 2020-05-18 | 2024-04-26 | 河南鑫泰钙业有限公司 | Ultra-pure ultra-white heavy body light calcium carbonate and production equipment and method thereof |
| CN111559752A (en) * | 2020-05-20 | 2020-08-21 | 建德市双超钙业有限公司 | Production method of nano calcium carbonate for PE direct film blowing |
| CN111874933A (en) * | 2020-08-14 | 2020-11-03 | 王权广 | Quick preparation process of rice-grain light calcium carbonate |
| CN115571903A (en) * | 2022-09-09 | 2023-01-06 | 广东翔龙科技股份有限公司 | Preparation method of high-end calcium carbonate applied to sunscreen cream |
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