CN112340760A - Production method of calcium carbonate for food - Google Patents
Production method of calcium carbonate for food Download PDFInfo
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- CN112340760A CN112340760A CN202011076514.7A CN202011076514A CN112340760A CN 112340760 A CN112340760 A CN 112340760A CN 202011076514 A CN202011076514 A CN 202011076514A CN 112340760 A CN112340760 A CN 112340760A
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- calcium carbonate
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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 206
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 103
- 235000013305 food Nutrition 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 46
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 34
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 32
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 32
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 26
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 21
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 19
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000292 calcium oxide Substances 0.000 claims abstract description 12
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000003763 carbonization Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229930006000 Sucrose Natural products 0.000 claims abstract description 6
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims abstract description 6
- 239000000654 additive Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 239000005720 sucrose Substances 0.000 claims abstract description 6
- 229920002472 Starch Polymers 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000008107 starch Substances 0.000 claims abstract description 5
- 235000019698 starch Nutrition 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 22
- 239000000047 product Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000029087 digestion Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010000 carbonizing Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 238000011085 pressure filtration Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 239000012798 spherical particle Substances 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000004572 hydraulic lime Substances 0.000 claims 2
- 238000002156 mixing Methods 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 4
- 239000011575 calcium Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 235000013373 food additive Nutrition 0.000 description 2
- 239000002778 food additive Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920000142 Sodium polycarboxylate Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000725 suspension Substances 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
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/015—Inorganic compounds
-
- 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
- C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
-
- 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
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a production method of calcium carbonate for food, which comprises the steps of 1, preparing calcium hydroxide slurry, 2, carrying out carbonization reaction, 3, removing impurities and modifying, and 4, drying a finished product. Specifically, quicklime with impurity content less than 2% is selected to prepare calcium hydroxide slurry with concentration of 5-8%; adding the mixture into a reaction kettle; introducing carbon dioxide gas to obtain calcium carbonate slurry; centrifuging and filtering the calcium carbonate slurry, adding a citric acid solution, cleaning and filtering by adopting 30-40% of ethanol solution by mass, and drying; packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles with additives such as starch, sucrose and the like. The food-grade calcium carbonate prepared by the invention has the characteristics of simple process and high product purity, and effectively solves the defects of the prior art.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a production method of calcium carbonate for food.
Background
The light calcium carbonate is one of the most widely used inorganic fillers, is widely used in the fields of food, daily chemicals, medicines, rubber, plastics, coatings and the like, and is mainly used as a product filler to increase the volume of a product and reduce the production cost. In the food industry, calcium carbonate is an important food additive in the food field as a calcareous ingredient or filler material.
For the preparation of calcium carbonate, carbon dioxide gas is introduced into a suspension of calcium hydroxide with a certain concentration for carbonization, so that calcium carbonate is obtained after the calcium hydroxide reacts with calcium dioxide. Calcium carbonate is used as a food additive and has strict requirements on purity, calcium carbonate content and impurity content. The core of the food grade calcium carbonate is high purity, high whiteness, and almost no impurities. However, the light calcium carbonate prepared at present has high content of impurities such as metal magnesium, iron or aluminum, and the like, and is easy to agglomerate in the using process, thereby seriously influencing the application of the calcium carbonate in the food field.
The patent with the application number of 201910924880.4 discloses the invention, relates to the technical field of calcium carbonate preparation, and particularly discloses a preparation method of light calcium carbonate for food. The preparation method at least comprises the following steps: digestion: performing digestion reaction on calcium oxide and water to obtain raw Ca (OH)2 slurry; removing impurities: adding hydrochloric acid into the Ca (OH)2 raw slurry for acidification, and then adding Ca (OH)2 dispersion liquid to adjust the pH value to 11-12 to obtain Ca (OH)2 fine slurry; purifying kiln gas; carbonizing: adding Ca (OH)2 fine slurry into a reaction kettle, introducing the reaction gas under the stirring condition to carry out carbonization reaction, adding an amino acid chelating agent and a sodium polycarboxylate into the reaction kettle when the pH value of a reaction system is 8.0-9.0, and finishing the reaction when the pH value of the reaction system is 7-7.5 to obtain the light calcium carbonate for food.
In the scheme, the impurity content of the product is relatively high, the cost is high, and the use is inconvenient.
Disclosure of Invention
The invention aims to solve the technical problem of high impurity content of calcium carbonate for food, and provides a production method of calcium carbonate for food to overcome the defects of the prior art.
In order to achieve the above object, the present invention comprises the following solutions:
a production method of calcium carbonate for food comprises the steps of 1, preparing calcium hydroxide slurry, 2, carrying out carbonization reaction, 3, removing impurities and modifying, and 4, drying a finished product.
Specifically, step 1, quicklime with impurity content less than 2% is selected, and water and the quicklime are mixed according to the mass ratio of 6-7: 1, carrying out digestion reaction, then aging for at least 24 hours, sieving by a 200-mesh sieve to obtain calcium hydroxide coarse pulp, adding water into the calcium hydroxide coarse pulp, and continuously stirring the mixture in the water to prepare calcium hydroxide slurry with the concentration of 5-8%;
step 2, adding the calcium hydroxide slurry into a reaction kettle, heating to 40 ℃, adding a crystal form control agent, and continuously stirring at the stirring speed of 240-; introducing carbon dioxide gas to carry out carbonization reaction, reducing the stirring rotation speed to 120-180r/min, reducing the ventilation volume when the PH value is reduced to 7, and continuing stirring and carbonizing for 3-5 hours to obtain calcium carbonate slurry;
the ventilation capacity of carbon dioxide gas is not less than 0.15 cubic meter per second calculated by 1000L of calcium hydroxide slurry, and the reduced ventilation capacity is 5-10% of the normal value;
step 3, adding bicarbonate into the calcium carbonate slurry, heating the calcium carbonate slurry to 60-70 ℃ according to the proportion of 10:1 of the calcium carbonate to the bicarbonate, reacting for 1-3 hours at constant temperature, cooling to normal temperature, and filtering out crystals;
centrifugally filtering the calcium carbonate slurry, removing supernatant, adding 10-15 times of deionized water for dilution, uniformly stirring, adding a citric acid solution to adjust the pH value to 5.5, stirring for 1-3 hours, centrifugally filtering, adding 10-15 times of deionized water for cleaning; then carrying out centrifugal filtration again, and then carrying out pressure filtration until the water content is less than 30% to obtain wet calcium carbonate; cleaning and filtering by adopting 30-40% of ethanol solution by mass, and repeating for 2-3 times;
step 4, drying the cleaned and filtered calcium carbonate particles, firstly, spraying and drying, wherein the diameter of the sprayed and dried spherical particles is 0.5-1.5 mm, the drying temperature is 80-85 ℃, and spherical calcium carbonate with the water content of less than 3% is obtained; putting the spherical calcium carbonate into a hot air dryer, drying until the water content is less than 0.5%, and crushing the spherical calcium carbonate into calcium carbonate particles with the diameter less than 10 microns;
packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles with additives such as starch, sucrose and the like.
Further, in the step 2, a closed tank containing carbon dioxide is adopted, calcium hydroxide slurry is circularly atomized and sprayed in the tank, and mixed gas including clean carbon dioxide and nitrogen is adopted in the tank, wherein the content of the carbon dioxide is not less than 40%.
The food-grade calcium carbonate prepared by the invention has the characteristics of simple process and high product purity, and effectively solves the defects of the prior art.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it is obvious that the embodiments described below are some, but not all embodiments of the present invention in the description of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, a method for producing calcium carbonate for food, comprising the steps of 1, preparing calcium hydroxide slurry, 2, performing carbonization reaction, 3, removing impurities and modifying, and 4, drying the finished product.
Specifically, step 1, quicklime with impurity content less than 2% is selected, and water and the quicklime are mixed according to the mass ratio of 6-7: 1, carrying out digestion reaction, then aging for at least 24 hours, sieving by a 200-mesh sieve to obtain calcium hydroxide coarse pulp, adding water into the calcium hydroxide coarse pulp, and continuously stirring the mixture in the water to prepare calcium hydroxide slurry with the concentration of 5-8%;
step 2, adding the calcium hydroxide slurry into a reaction kettle, heating to 40 ℃, adding a crystal form control agent, and continuously stirring at the stirring speed of 240-; introducing carbon dioxide gas to carry out carbonization reaction, reducing the stirring rotation speed to 120-180r/min, reducing the ventilation volume when the PH value is reduced to 7, and continuing stirring and carbonizing for 3-5 hours to obtain calcium carbonate slurry;
the ventilation capacity of carbon dioxide gas is not less than 0.15 cubic meter per second calculated by 1000L of calcium hydroxide slurry, and the reduced ventilation capacity is 5-10% of the normal value;
step 3, adding bicarbonate into the calcium carbonate slurry, heating the calcium carbonate slurry to 60-70 ℃ according to the proportion of 10:1 of the calcium carbonate to the bicarbonate, reacting for 1-3 hours at constant temperature, cooling to normal temperature, and filtering out crystals;
centrifugally filtering the calcium carbonate slurry, removing supernatant, adding 10-15 times of deionized water for dilution, uniformly stirring, adding a citric acid solution to adjust the pH value to 5.5, stirring for 1-3 hours, centrifugally filtering, adding 10-15 times of deionized water for cleaning; then carrying out centrifugal filtration again, and then carrying out pressure filtration until the water content is less than 30% to obtain wet calcium carbonate; cleaning and filtering by adopting 30-40% of ethanol solution by mass, and repeating for 2-3 times;
step 4, drying the cleaned and filtered calcium carbonate particles, firstly, spraying and drying, wherein the diameter of the sprayed and dried spherical particles is 0.5-1.5 mm, the drying temperature is 80-85 ℃, and spherical calcium carbonate with the water content of less than 3% is obtained; putting the spherical calcium carbonate into a hot air dryer, drying until the water content is less than 0.5%, and crushing the spherical calcium carbonate into calcium carbonate particles with the diameter less than 10 microns;
packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles with additives such as starch, sucrose and the like.
In the step 2, the pressure in the reaction kettle is controlled to be 0.2-0.6 MPa;
embodiment 2, a production method of calcium carbonate for food, comprising the steps of 1, preparing calcium hydroxide slurry, 2, performing carbonization reaction, 3, removing impurities and modifying, and 4, drying the finished product.
Specifically, step 1, quicklime with impurity content less than 2% is selected, and water and the quicklime are mixed according to the mass ratio of 6-7: 1, carrying out digestion reaction, then aging for at least 24 hours, sieving by a 200-mesh sieve to obtain calcium hydroxide coarse pulp, adding water into the calcium hydroxide coarse pulp, and continuously stirring the mixture in the water to prepare calcium hydroxide slurry with the concentration of 5-8%;
step 2, placing the calcium hydroxide slurry into a reaction kettle, introducing carbon dioxide, taking out and adding a crystal form control agent when the pH value is reduced to 8.5, uniformly stirring, placing the mixture into a closed tank containing the carbon dioxide, circularly atomizing and spraying in the tank, introducing gas into the tank through a gas tank, stopping introducing the gas when the pH value is reduced to 7, and continuously spraying and carbonizing for 1-2 hours to obtain calcium carbonate slurry;
the pressure in the tank body is controlled to be 0.1-0.25 MPa;
step 3, adding bicarbonate into the calcium carbonate slurry, heating the calcium carbonate slurry to 60-70 ℃ according to the proportion of 10:1 of the calcium carbonate to the bicarbonate, reacting for 1-3 hours at constant temperature, cooling to normal temperature, and filtering out crystals;
then carrying out centrifugal filtration on the calcium carbonate slurry, removing supernatant, adding 10-15 times of deionized water for dilution, uniformly stirring, then adding a citric acid solution to adjust the pH value to 5.5, stirring for 1-3 hours, then carrying out centrifugal filtration, and adding 10-15 times of deionized water for cleaning; then carrying out centrifugal filtration again, and then carrying out pressure filtration until the water content is less than 30% to obtain wet calcium carbonate; cleaning and filtering by adopting 30-40% of ethanol solution by mass, and repeating for 2-3 times;
step 4, drying the cleaned and filtered calcium carbonate particles, firstly, spraying and drying, wherein the diameter of the sprayed and dried spherical particles is 0.5-1.5 mm, the drying temperature is 80-85 ℃, and spherical calcium carbonate with the water content of less than 3% is obtained; putting the spherical calcium carbonate into a hot air dryer, drying until the water content is less than 0.5%, and crushing the spherical calcium carbonate into calcium carbonate particles with the diameter less than 10 microns;
packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles with additives such as starch, sucrose and the like.
In the step 2, mixed gas is adopted in the gas tank, the mixed gas comprises clean carbon dioxide and nitrogen, wherein the content of the carbon dioxide is not less than 40%, and the content of the carbon dioxide in the gas tank is kept above 30%.
Example 3, example 1 product testing, in comparison to the prior art, is shown in table 1.
TABLE 1
| Product(s) | The total content of impurities is less than or equal to | The content of iron-containing oxide is less than or equal to | Silicon-containing oxide content≤ | The content of oxide containing magnesium is less than or equal to | Whiteness degree |
| Example 1 | 0.05% | 0.005% | 0.02% | 0.002% | 97 |
| Prior Art | 0.1% | 0.009% | 0.05% | 0.003% | 95-97 |
The above table shows that all indexes of the product of the embodiment meet the requirements, the impurity content is lower than that of the prior art, and the whiteness is higher.
The preparation method of calcium carbonate has the characteristics of simple process and high product purity, and effectively solves the defects of the prior art.
The embodiments described above are some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (4)
1. A production method of calcium carbonate for food comprises the steps of 1, preparing calcium hydroxide slurry, 2, carrying out carbonization reaction, 3, removing impurities and modifying, and 4, drying a finished product.
2. The production method of calcium carbonate for food as claimed in claim 1, wherein the method comprises the step 1 of selecting quicklime with impurity content less than 2%, and mixing water and quicklime according to the mass ratio of 6-7: 1, carrying out digestion reaction, then aging for at least 24 hours, sieving by a 200-mesh sieve to obtain calcium hydroxide coarse pulp, adding water into the calcium hydroxide coarse pulp, and continuously stirring the mixture in the water to prepare calcium hydroxide slurry with the concentration of 5-8%;
step 2, adding the calcium hydroxide slurry into a reaction kettle, heating to 40 ℃, adding a crystal form control agent, and continuously stirring at the stirring speed of 240-; introducing carbon dioxide gas to carry out carbonization reaction, reducing the stirring rotation speed to 120-180r/min, reducing the ventilation volume when the PH value is reduced to 7, and continuing stirring and carbonizing for 3-5 hours to obtain calcium carbonate slurry;
the ventilation capacity of carbon dioxide gas is not less than 0.15 cubic meter per second calculated by 1000L of calcium hydroxide slurry, and the reduced ventilation capacity is 5-10% of the normal value;
step 3, adding bicarbonate into the calcium carbonate slurry, heating the calcium carbonate slurry to 60-70 ℃ according to the proportion of 10:1 of the calcium carbonate to the bicarbonate, reacting for 1-3 hours at constant temperature, cooling to normal temperature, and filtering out crystals;
centrifugally filtering the calcium carbonate slurry, removing supernatant, adding 10-15 times of deionized water for dilution, uniformly stirring, adding a citric acid solution to adjust the pH value to 5.5, stirring for 1-3 hours, centrifugally filtering, adding 10-15 times of deionized water for cleaning; then carrying out centrifugal filtration again, and then carrying out pressure filtration until the water content is less than 30% to obtain wet calcium carbonate; cleaning and filtering by adopting 30-40% of ethanol solution by mass, and repeating for 2-3 times;
step 4, drying the cleaned and filtered calcium carbonate particles, firstly, spraying and drying, wherein the diameter of the sprayed and dried spherical particles is 0.5-1.5 mm, the drying temperature is 80-85 ℃, and spherical calcium carbonate with the water content of less than 3% is obtained; putting the spherical calcium carbonate into a hot air dryer, drying until the water content is less than 0.5%, and crushing the spherical calcium carbonate into calcium carbonate particles with the diameter less than 10 microns;
packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles with additives such as starch, sucrose and the like.
3. The production method of calcium carbonate for food as claimed in claim 2, which comprises the step 1 of selecting quicklime with impurity content less than 2%, mixing water and quicklime according to the mass ratio of 6-7: 1, carrying out digestion reaction, then aging for at least 24 hours, sieving by a 200-mesh sieve to obtain calcium hydroxide coarse pulp, adding water into the calcium hydroxide coarse pulp, and continuously stirring the mixture in the water to prepare calcium hydroxide slurry with the concentration of 5-8%;
step 2, placing the calcium hydroxide slurry into a reaction kettle, introducing carbon dioxide, taking out and adding a crystal form control agent when the pH value is reduced to 8.5, uniformly stirring, placing the mixture into a closed tank containing the carbon dioxide, circularly atomizing and spraying in the tank, introducing gas into the tank through a gas tank, stopping introducing the gas when the pH value is reduced to 7, and continuously spraying and carbonizing for 1-2 hours to obtain calcium carbonate slurry;
step 3, adding bicarbonate into the calcium carbonate slurry, heating the calcium carbonate slurry to 60-70 ℃ according to the proportion of 10:1 of the calcium carbonate to the bicarbonate, reacting for 1-3 hours at constant temperature, cooling to normal temperature, and filtering out crystals;
centrifugally filtering the calcium carbonate slurry, removing supernatant, adding 10-15 times of deionized water for dilution, uniformly stirring, adding a citric acid solution to adjust the pH value to 5.5, stirring for 1-3 hours, centrifugally filtering, adding 10-15 times of deionized water for cleaning; then carrying out centrifugal filtration again, and then carrying out pressure filtration until the water content is less than 30% to obtain wet calcium carbonate; cleaning and filtering by adopting 30-40% of ethanol solution by mass, and repeating for 2-3 times;
step 4, drying the cleaned and filtered calcium carbonate particles, firstly, spraying and drying, wherein the diameter of the sprayed and dried spherical particles is 0.5-1.5 mm, the drying temperature is 80-85 ℃, and spherical calcium carbonate with the water content of less than 3% is obtained; putting the spherical calcium carbonate into a hot air dryer, drying until the water content is less than 0.5%, and crushing the spherical calcium carbonate into calcium carbonate particles with the diameter less than 10 microns;
packaging the calcium carbonate particles, or continuously grinding the calcium carbonate particles to obtain finer particles, or packaging the calcium carbonate particles, the sucrose and the additives.
4. The method for producing calcium carbonate for food as claimed in claim 3, wherein in step 2, the gas tank is filled with a mixed gas comprising clean carbon dioxide and nitrogen, wherein the carbon dioxide content is not less than 40%, and the carbon dioxide content in the gas in the tank is maintained at 30% or more.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076514.7A CN112340760A (en) | 2020-10-10 | 2020-10-10 | Production method of calcium carbonate for food |
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| CN202011076514.7A CN112340760A (en) | 2020-10-10 | 2020-10-10 | Production method of calcium carbonate for food |
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| CN (1) | CN112340760A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114988452A (en) * | 2022-07-25 | 2022-09-02 | 宁远华创粉体材料有限公司 | Production method of calcium carbonate for food |
| CN116573941A (en) * | 2023-02-28 | 2023-08-11 | 佛山市杨森化工有限公司 | Production process and formula of powder dispergation enhancer |
-
2020
- 2020-10-10 CN CN202011076514.7A patent/CN112340760A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114988452A (en) * | 2022-07-25 | 2022-09-02 | 宁远华创粉体材料有限公司 | Production method of calcium carbonate for food |
| CN116573941A (en) * | 2023-02-28 | 2023-08-11 | 佛山市杨森化工有限公司 | Production process and formula of powder dispergation enhancer |
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