KR20140087331A - Method of manufacturing calcium carbonate from calcium silicate by-products - Google Patents
Method of manufacturing calcium carbonate from calcium silicate by-products Download PDFInfo
- Publication number
- KR20140087331A KR20140087331A KR1020120157210A KR20120157210A KR20140087331A KR 20140087331 A KR20140087331 A KR 20140087331A KR 1020120157210 A KR1020120157210 A KR 1020120157210A KR 20120157210 A KR20120157210 A KR 20120157210A KR 20140087331 A KR20140087331 A KR 20140087331A
- Authority
- KR
- South Korea
- Prior art keywords
- calcium carbonate
- calcium
- chloride
- product
- carbonate
- Prior art date
Links
Images
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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
A method for producing hard calcium carbonate, comprising: a first step of adding a calcium silicate-based by-product to an aqueous solution of ammonium chloride to obtain calcium chloride and ammonium hydroxide; Adding the calcium chloride and sodium hydrogen carbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate; And a third step of recovering the light calcium carbonate from the product containing the light calcium carbonate.
Description
And a process for producing hard calcium carbonate using a calcium silicate-based by-product.
Conventional hard calcium carbonate manufacturing technology that is currently being applied in industry is to produce calcium hydroxide by mixing high-purity heavy calcium carbonate with calcined calcium oxide (CaO) with water (H 2 O) to produce calcium hydroxide, Carbon dioxide removed from the process is added to produce light calcium carbonate. However, since this method does not have a separate purification step, calcium silicate-based raw materials can not be used and calcium silicate-based byproducts can not be utilized.
Alternatively, there is a method of extracting calcium ions by dissolving calcium silicate by-products (oxides) in water, but the calcium silicate byproduct is not suitable for industrialization because the concentration of calcium ions extracted from the water is low and it takes a long time to dissolve (Korean Unexamined Patent Application Publication No. 1993-7002229 and others). It is difficult to satisfy the condition of pH 12 or more which is easy to react with carbon dioxide to form calcium carbonate.
On the other hand, a method of using ammonium salts (typically ammonium chloride, ammonium acetate, ammonium nitrate) to extract calcium from calcium silicate byproducts (Steel research international, Vol.80, Issue 6, pp. 415-421, June, 2009 ), But it is not economical because the price of the ammonium salt used is higher than that of the hard calcium carbonate produced.
A technique for producing light calcium carbonate using a calcium silicate-based by-product can be provided.
In one embodiment of the present invention, a calcium silicate-based by-product is introduced into an aqueous solution of ammonium chloride to obtain calcium chloride and ammonium hydroxide; Adding the calcium chloride and sodium hydrogen carbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate; And a third step of recovering the light calcium carbonate from the product containing the light calcium carbonate.
The calcium silicate-based by-product may be Ca 2 SiO 4 .
In one embodiment of the present invention, after the third step of recovering the light calcium carbonate from the product comprising the light calcium carbonate, sodium chloride, ammonia, and carbon dioxide in the product comprising the light calcium carbonate are reacted with water To obtain an aqueous solution of sodium hydrogencarbonate and an aqueous solution of ammonium chloride.
The sodium bicarbonate may be reused as the sodium bicarbonate in the second step, and the ammonium chloride aqueous solution may be reused as the ammonium chloride aqueous solution of the first step.
According to one embodiment of the present invention, a high calcium ion concentration can be secured by reacting a calcium silicate-based by-product with an aqueous solution of ammonium chloride instead of a conventional aqueous solution, calcium carbonate can be more easily produced using the high solubility of sodium carbonate, It is possible to secure economical efficiency by reusing ammonium chloride produced by the by-product sodium chloride and ammonia gas in the reaction.
Figure 1 is a chemical reaction equation used in one embodiment of the present invention.
Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.
An embodiment of the present invention includes a first step of introducing calcium silicate-based by-products into an aqueous solution of ammonium chloride to obtain calcium chloride and ammonium hydroxide; Adding the calcium chloride and sodium hydrogen carbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate; And a third step of recovering the light calcium carbonate from the product containing the light calcium carbonate.
Generally, a high-purity crystalline calcium carbonate with a high degree of whiteness is physically and mechanically pulverized and classified to produce a heavy calcium carbonate, and chemically produced is referred to as a light calcium carbonate. One embodiment of the present invention relates to a method of making light calcium carbonate.
Hereinafter, the first step of introducing the calcium silicate-based by-product into an aqueous solution of ammonium chloride to obtain calcium chloride and ammonium hydroxide will be described.
The calcium silicate-based by-product may be Ca 2 SiO 4 , but is not limited thereto. It may be a composite oxide in which silicon dioxide (SiO 2 ) and calcium oxide (CaO) are formed in an arbitrary composition ratio, such as steel slag and magnesium- And can be used as the calcium silicate-based by-product.
The chemical reaction formula of the first step for introducing the calcium silicate-based by-product into an aqueous solution of ammonium chloride to obtain calcium chloride and ammonium hydroxide is shown in the following reaction formula (1).
[Reaction Scheme 1]
Ca 2 SiO 4 (s) + 4 NH 4 Cl (aq)? 2 CaCl 2 (aq) + 4 NH 4 OH (aq) + SiO 2 (s)
When the calcium silicate-based by-product (Ca 2 SiO 4 ) is introduced into the aqueous ammonium chloride solution, the silicon dioxide is precipitated, and calcium chloride and ammonium hydroxide are present in an ionic state on the aqueous solution. That is, it is possible to remove the solid phase silicon dioxide and the unreacted calcium silicate through sedimentation or filtration of the product of the reaction formula (1).
Conventionally, low calcium ionization and slow ionization rate of calcium silicate have been problematic by using water instead of ammonium chloride aqueous solution. However, according to one embodiment of the present invention, by using an ammonium chloride aqueous solution, a high calcium ion concentration can be secured from calcium silicate to increase the production amount.
Hereinafter, the second step of adding the calcium chloride and the sodium hydrogencarbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate will be described.
The chemical reaction formula of the second step of adding the calcium chloride and sodium hydrogen carbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate is shown in the following Reaction Scheme 2.
[Reaction Scheme 2]
CaCl 2 (aq) + 2NH 4 OH (aq) + 2NaHCO 3 (s)
→ CaCO 3 (aq) + 2NH 3 (g) + 2NaCl (aq) + CO 2 (g) + 3H 2 O (l)
After the solid phase silicon dioxide and the unreacted calcium silicate are removed in the first step, sodium bicarbonate is added to an aqueous solution containing calcium chloride and ammonium hydroxide to precipitate the hardly soluble calcium carbonate. Can be obtained. The product comprising the light calcium carbonate includes light calcium carbonate, ammonia, sodium chloride, carbon dioxide, and water.
Conventionally, instead of sodium hydrogencarbonate, carbon dioxide is added. In order to react calcium carbonate with carbon dioxide to form calcium carbonate, an alkaline atmosphere of pH 12 or more must be formed. However, it is difficult to form an alkaline atmosphere having a pH of 12 or more, and even when carbon dioxide is introduced, calcium hydrogen carbonate rather than calcium carbonate is easily produced due to formation of a low alkali atmosphere.
On the other hand, according to one embodiment of the present invention, by using sodium hydrogen carbonate, a high carbonate ion concentration condition can be maintained, and a high concentration of calcium ion extracted due to ammonium chloride can be combined to precipitate a large amount of calcium carbonate .
Hereinafter, the third step of recovering the light calcium carbonate from the product containing the light calcium carbonate will be described.
The light calcium carbonate is low in solubility and is precipitated without being dissolved in an aqueous solution of sodium chloride, which is one of the products of the second step. The precipitated hard calcium carbonate can be recovered through sedimentation or filtration to recover the hard calcium carbonate.
In one embodiment of the present invention, after the third step of recovering the light calcium carbonate from the product comprising the light calcium carbonate, sodium chloride, ammonia, and carbon dioxide in the product comprising the light calcium carbonate are reacted with water to produce hydrogen carbonate And a step of obtaining an aqueous sodium chloride solution and an aqueous ammonium chloride solution.
After the third step of recovering the hard calcium carbonate from the product containing the hard calcium carbonate, sodium chloride, ammonia, and carbon dioxide in the product containing the hard calcium carbonate are reacted with water to obtain an aqueous solution of sodium hydrogencarbonate and ammonium chloride The chemical reaction equation of the step is as shown in the following reaction formula 3.
[Reaction Scheme 3]
NaCl (aq) + NH 3 ( g) + CO 2 (g) + H 2 O (l) → NaHCO 3 (s) + NH 4 Cl (aq)
When the sodium chloride aqueous solution, water, ammonia gas and carbon dioxide gas after the third step are reacted, a solid sodium hydrogencarbonate and ammonium chloride aqueous solution can be obtained.
Sodium bicarbonate, which is one of the products of Reaction Scheme 3, can be reused as the sodium hydrogen carbonate in the second stage, that is, the reaction product of Reaction Scheme 2.
The ammonium chloride aqueous solution, which is one of the products of Reaction Scheme 3, can be reused as the ammonium chloride aqueous solution of the first step, that is, the reaction product of Reaction Scheme 1. [
While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of the right.
Claims (4)
Adding the calcium chloride and sodium hydrogen carbonate to the ammonium hydroxide to obtain a product containing light calcium carbonate; And
A third step of recovering the light calcium carbonate from the product comprising the light calcium carbonate,
≪ / RTI >
Wherein the calcium silicate-based by-product is Ca 2 SiO 4 .
After the third step of recovering the light calcium carbonate from the product containing the light calcium carbonate,
Further comprising the step of reacting sodium chloride, ammonia, and carbon dioxide in the product containing the light calcium carbonate with water to obtain an aqueous solution of sodium hydrogen carbonate and ammonium chloride.
Wherein the sodium bicarbonate is reused as the sodium bicarbonate in the second step and the ammonium chloride aqueous solution is reused as the ammonium chloride aqueous solution in the first step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120157210A KR20140087331A (en) | 2012-12-28 | 2012-12-28 | Method of manufacturing calcium carbonate from calcium silicate by-products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120157210A KR20140087331A (en) | 2012-12-28 | 2012-12-28 | Method of manufacturing calcium carbonate from calcium silicate by-products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20140087331A true KR20140087331A (en) | 2014-07-09 |
Family
ID=51736264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020120157210A KR20140087331A (en) | 2012-12-28 | 2012-12-28 | Method of manufacturing calcium carbonate from calcium silicate by-products |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20140087331A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180029940A (en) * | 2016-09-13 | 2018-03-21 | 재단법인 포항산업과학연구원 | Manufacture method and equipment for sodium hydrogen carbonate and calcium carbonate |
| WO2018052220A1 (en) * | 2016-09-13 | 2018-03-22 | 재단법인 포항산업과학연구원 | Method and facility for preparing sodium bicarbonate and calcium carbonate |
| KR20190050236A (en) * | 2017-11-02 | 2019-05-10 | 경기대학교 산학협력단 | Method for extracting calcium ions from inorganic materials containing alkaline ions for indirect carbonation process |
-
2012
- 2012-12-28 KR KR1020120157210A patent/KR20140087331A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180029940A (en) * | 2016-09-13 | 2018-03-21 | 재단법인 포항산업과학연구원 | Manufacture method and equipment for sodium hydrogen carbonate and calcium carbonate |
| WO2018052220A1 (en) * | 2016-09-13 | 2018-03-22 | 재단법인 포항산업과학연구원 | Method and facility for preparing sodium bicarbonate and calcium carbonate |
| KR20190050236A (en) * | 2017-11-02 | 2019-05-10 | 경기대학교 산학협력단 | Method for extracting calcium ions from inorganic materials containing alkaline ions for indirect carbonation process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7604787B2 (en) | Process for sequestering carbon dioxide and sulfur dioxide | |
| US8721999B2 (en) | Process for simultaneous production of potassium sulphate, ammonium sulfate, magnesium hydroxide and/or magnesium oxide from kainite mixed salt and ammonia | |
| CN100390064C (en) | Production of superfine calcium carbonate from carbide slag | |
| RU2014128763A (en) | RESTORATION METHOD OF CONTINUOUS EXTRACTION OF CALCIUM AND PRODUCTION OF DEPOSITED CALCIUM CARBONATE | |
| JP2008528421A (en) | Magnesium oxide manufacturing process | |
| US20230040892A1 (en) | A process for producing alumina and a lithium salt | |
| JP5406822B2 (en) | Method for producing lithium carbonate | |
| WO2016028023A1 (en) | Method for preparing carbonate | |
| RU2008104324A (en) | METHOD FOR PRODUCING FERTILIZER AND CO2 | |
| KR20140087331A (en) | Method of manufacturing calcium carbonate from calcium silicate by-products | |
| CN102247753A (en) | Process for storing carbon dioxide in flue gas by utilizing brucite | |
| CL2016002716A1 (en) | Method to produce lithium carbonate | |
| RU2020129353A (en) | INTEGRATED METHOD FOR CARBONIZING MINERALS | |
| KR101946483B1 (en) | Method for manufacturing lithium hydroxide and method for manufacturing lithium carbonate using the same | |
| TR200103265T1 (en) | Strontium carbonate production from celestite. | |
| KR20140087330A (en) | Method of manufacturing calcium carbonate from calcium silicate by-products | |
| KR101856959B1 (en) | Manufacture method and equipment for sodium hydrogen carbonate and calcium carbonate | |
| JP2011016668A (en) | Method for producing manganese carbonate | |
| CN110734422A (en) | Production method of propylene carbonate or ethylene carbonate | |
| JP2008137863A (en) | Recycling method for gypsum board | |
| RU2793756C1 (en) | Method for lithium extraction, method for obtaining lithium carbonate and method for obtaining lithium hydroxide | |
| US20220396492A1 (en) | Carbon dioxide fixation method | |
| WO2015029495A1 (en) | Method for reducing strontium ion concentration | |
| KR20240069542A (en) | Extraction of useful resources from ferronickel slag and manufacturing method of building finishing materials using byproducts | |
| RU2503487C1 (en) | Method of obtaining chloride from calcium chloride |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WITN | Withdrawal due to no request for examination |