CN115354099A - Method for separating carbon dioxide in blast furnace gas from metallurgical slag - Google Patents
Method for separating carbon dioxide in blast furnace gas from metallurgical slag Download PDFInfo
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- CN115354099A CN115354099A CN202211120733.XA CN202211120733A CN115354099A CN 115354099 A CN115354099 A CN 115354099A CN 202211120733 A CN202211120733 A CN 202211120733A CN 115354099 A CN115354099 A CN 115354099A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/025—Other waste gases from metallurgy plants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Health & Medical Sciences (AREA)
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to the technical field of blast furnace ironmaking, in particular to a method for separating carbon dioxide in blast furnace gas from metallurgical slag; the method comprises the following steps: adjusting the pH value of the metallurgical slag to 5.5-6.5 by using a leaching agent and leaching Ca 2+ Filtering to obtain filtrate A, adding caustic soda solution into the filtrate to regulate pH value to 10.5-11.5, removing alkali metal ion impurity, filtering to obtain filtrate B, injecting blast furnace gas into the filtrate B to carbonate so as to obtain light CaCO 3 And (5) producing the product. The invention firstly extracts Ca in metallurgical slag by using leaching agent 2+ So that a large amount of Ca is present in the filtrate 2+ Then carbonating with blast furnace gas, the reaction time and the reaction efficiency of the two can be greatly improvedRate; the method for separating the carbon dioxide from the blast furnace gas by the metallurgical slag adopts liquid alkali to adjust the pH value to 10.5-11.5, can effectively remove other alkali metal ion impurities, and further improves the Ca content in the filtrate 2+ Purity of CaCO obtained by carbonation 3 And the added value of the product is higher.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a method for separating carbon dioxide in blast furnace gas from metallurgical slag.
Background
The main cause of global warming is an increase in the concentration of greenhouse gases, among which CO in the atmosphere 2 Contributing two thirds of the warming effect. CO2 2 Capture and storage (sequestration) has been extensively studied worldwide.
Metallurgical slag is the largest byproduct of steel enterprises, and steel smelting metallurgical slag includes blast furnace steelmaking slag, converter steelmaking slag, electric furnace steelmaking slag (including electric furnace common carbon steel slag and electric furnace special steel slag) and slag treated outside the furnace (LF refining slag, AOD furnace slag, KR desulfurization slag, etc.) according to smelting process. Taking a long process as an example, about 500-550kg of smelting slag is discharged every 1t of crude steel produced, wherein the production amount of blast furnace slag is about 346kg/t of iron, the production amount of converter steel slag is about 100-150kg/t of steel, about 40kg/t of steel is produced in the molten iron pretreatment process, and about 15kg/t of steel is produced in LF refined slag. The production amount of the waste residues of the iron and steel enterprises is large, particularly the utilization rate of the waste residues of the steel plants is low, and a large amount of land is always occupied for piling and storing the waste residues. Therefore, many steel companies have made the recycling of waste slag as one of the effective ways for the companies to develop sustainable resources.
Prior artIn the art, chinese patent application publication No. CN113913571A discloses an apparatus for separating carbon dioxide from blast furnace gas using metallurgical slag and a separation method thereof, wherein the separation method comprises: introducing metallurgical slag into the slag buffer tank (3) from the slag runner (8), after a preset amount of slag is stored in the slag buffer tank (3), opening a valve (4) at the bottom of the slag buffer tank (3) to enable the slag to enter the reactor (2), introducing blast furnace gas into the reactor (2) through the ascending pipe (5), the gas descending pipe (6) and the first gas pipeline (7) in sequence, reacting with the slag in the reactor (2), and after reaction, allowing the slag to be rich in CaCO 3 Is discharged from the slag outlet (10) and then enters a subsequent INBA system for water cooling and granulation, and the blast furnace gas with separated CO2 enters the blast furnace (1) through the second gas pipeline (11) to be used as indirect reducing gas in the blast furnace (1).
The technical scheme has the following defects:
(1) The method does not carry out Ca on the high-temperature liquid slag 2+ Extracting by directly mixing high temperature liquid slag and high pressure CO 2 The acidification treatment has the problems of long reaction time and low reaction efficiency;
(2) The process does not take into account high temperature liquid slag and high pressure CO 2 Other alkali metal ion impurities are removed in the acidification treatment reaction, so that the obtained CaCO 3 The purity is not high, and the added value of the product is low.
Therefore, a method for separating carbon dioxide in blast furnace gas from metallurgical slag is provided.
Disclosure of Invention
The invention aims to provide a method for separating carbon dioxide in blast furnace gas from metallurgical slag so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for separating carbon dioxide in blast furnace gas by metallurgical slag comprises the following steps:
adjusting the pH value of the metallurgical slag to 5.5-6.5 by using a leaching agent and leaching Ca 2+ Filtering to obtain filtrate A, and adding into the filtrateAdjusting pH to 10.5-11.5 with alkali solution, removing alkali metal ion impurities, filtering to obtain filtrate B, and carbonating by injecting blast furnace gas into the filtrate B to obtain light CaCO 3 Producing a product; wherein the blast furnace gas is a combustible gas byproduct in the blast furnace ironmaking production process, wherein CO in the blast furnace gas 2 The content of (A) is 6-15%, the content of CO is 25-35%, and H 2 0.5-3% of N 2 55-60% of hydrocarbon, 0.2-0.5% of SO 2 The content of (A) is 0.46-0.7%.
Specifically, siO in the metallurgical slag 2 34.2 to 35.8 percent of CaO, 32.7 to 33.1 percent of CaO and Fe 2 O 3 2.3-2.9% of Al 2 O 3 20.6-21.4% of MgO, 1.5-2.1% of MgO and 4.7-8.7% of other impurities.
Specifically, the leaching agent adopts an ammonium chloride saturated solution, and the preparation process of the ammonium chloride saturated solution is as follows: and (3) putting ammonium chloride with the weight content of more than or equal to 96% into the solution, and heating to 90-100 ℃ to obtain an ammonium chloride saturated solution.
Specifically, the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
Specifically, the injection speed of the blast furnace gas is 2-10m 3 The speed of/min.
Specifically, the liquid alkali is 5-8% of sodium hydroxide solution by volume.
Specifically, CO is collected by separating CO by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is taken as indirect reducing gas in the blast furnace and is introduced into the blast furnace.
The principle of the invention is as follows:
the invention relates to SiO in metallurgical slag 2 34.2 to 35.8 percent of CaO, 32.7 to 33.1 percent of CaO and Fe 2 O 3 2.3-2.9% of Al 2 O 3 20.6-21.4% of MgO, 1.5-2.1% of MgO and 4.7-8.7% of other impurities.
The blast furnace gas related by the invention is a combustible gas byproduct in the blast furnace ironmaking production process, whereinCO in the blast furnace gas 2 The content of (A) is 6-15%, the content of CO is 25-35%, and H 2 Content of 0.5-3%, N 2 55-60% of hydrocarbon, 0.2-0.5% of SO 2 The content of (A) is 0.46-0.7%.
The first step is as follows: adjusting the pH value of the metallurgical slag to 5.5-6.5 by using a leaching agent and leaching Ca 2+ Then filtrate A is obtained by filtration, and the reaction equation is as follows:
4HN 4 Cl(a)+2CaO·SiO 2 (s)→2CaCl 2 (a)+SiO 2 (s)↓+4HN 3 (a)+2H 2 O (l)
in the reaction process, saturated solution of ammonium chloride is used as a leaching agent, on one hand, the ammonium chloride is used as a strong acid and weak base salt, and Ca is extracted 2+ When necessary, caO. SiO can be added 2 The reaction is carried out under the acidic condition, which is more beneficial to Ca 2+ On the other hand, by introducing a gas containing CO 2 After the blast furnace gas is carbonated, the regeneration of the ammonium chloride solution can be realized subsequently and synchronously, the recovery and the cyclic utilization are easy, and the method is suitable for industrial large-scale application.
In addition, the preparation process of the ammonium chloride saturated solution comprises the following steps: adding ammonium chloride with weight content of more than or equal to 96% into the solution, heating to 90-100 deg.C to obtain ammonium chloride saturated solution, which is used for greatly improving the solubility of ammonium chloride and further dissolving more ammonium chloride to react with Ca in metallurgical slag 2+ And (4) carrying out extraction reaction.
Specifically, the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
The second step is that: adding liquid alkali into the filtrate to adjust the pH value to 10.5-11.5, removing alkali metal ion impurities, and filtering to obtain filtrate B.
Wherein, the invention can make other alkali metal ion impurities, such as: al (Al) +3 、Mg 2+ And Fe +3 Removing Al in the solution when the pH value is 10.5-11.5 +3 、Mg 2+ And Fe +3 The concentration decreases to the lowest, and, al +3 、Mg 2+ And Fe +3 The precipitate has increased proportion and is not solubleThe intermediate substance can remove other alkali metal ion impurities to further obtain the light CaCO with higher purity 3 Products, mechanism of which is state of the art, including but not limited to the fixation of CO by carbonation of steel mill slag 2 The mechanism in the study of (1).
The third step: injecting blast furnace gas into the filtrate B for carbonation to obtain light CaCO 3 The product, the reaction equation is as follows:
HN 3 (a)+2CO 2 (a)+2CaCl 2 (a)+4H 2 O(l)→2CaCO 3 (s)↓+4HN 4 Cl(a)
wherein the injection speed of blast furnace gas is 2-10m 3 The speed of/min.
Further, the invention relates to the collection of CO separated by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is introduced into the blast furnace as indirect reduction gas in the blast furnace, wherein the ammonia gas recovery tower recovers ammonia gas and water, which is the prior art and is not described herein again.
The beneficial effects of the invention are as follows:
(1) The invention relates to a method for separating carbon dioxide from blast furnace gas by metallurgical slag, which firstly extracts Ca in the metallurgical slag by a leaching agent 2+ So that a large amount of Ca is present in the filtrate 2+ Then carbonating with blast furnace gas, which can greatly improve the reaction time and reaction efficiency of the two;
(2) The method for separating the carbon dioxide in the blast furnace gas from the metallurgical slag adopts liquid alkali to adjust the pH value to 10.5-11.5, can effectively remove other alkali metal ion impurities, and further improves the Ca content in the filtrate 2+ Purity of CaCO obtained by carbonation 3 And the added value of the product is higher.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
A method for separating carbon dioxide from blast furnace gas by metallurgical slag comprises the following steps:
adjusting the pH value of the metallurgical slag to 5.5 by using a leaching agent and leaching Ca 2+ Filtering to obtain filtrate A, adding caustic soda solution into the filtrate to regulate pH value to 10.5, removing alkali metal ion impurity, filtering to obtain filtrate B, injecting blast furnace gas into the filtrate B, carbonating to obtain light CaCO 3 Producing a product; wherein the blast furnace gas is a combustible gas byproduct in the blast furnace ironmaking production process, wherein CO in the blast furnace gas 2 Content of (2) 6%, content of CO 25%, H 2 Content 0.5%, N 2 55% of hydrocarbon, 0.2% of SO 2 The content of (B) is 0.46%.
Specifically, siO in the metallurgical slag 2 34.2% of CaO, 32.7% of CaO, fe 2 O 3 2.3% of Al 2 O 3 The content is 20.6%, the content of MgO is 1.5%, and the content of other impurities is 4.7%.
Specifically, the leaching agent adopts an ammonium chloride saturated solution, and the preparation process of the ammonium chloride saturated solution comprises the following steps: and (3) putting ammonium chloride with the weight content of more than or equal to 96% into the solution, and heating to 90-100 ℃ to obtain an ammonium chloride saturated solution.
Specifically, the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
Specifically, the injection speed of the blast furnace gas is 2-10m 3 The/min speed.
Specifically, the liquid alkali is 5% sodium hydroxide solution by volume.
Specifically, CO is collected by separating CO by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is used as indirect reduction gas in the blast furnace and is introduced into the blast furnace.
Example 2
A method for separating carbon dioxide from blast furnace gas by metallurgical slag comprises the following steps:
adjusting the pH value of the metallurgical slag to 6.5 by using a leaching agent and leaching Ca 2+ Filtering to obtain filtrate A, adding caustic soda solution into the filtrate to regulate pH value to 11.5, removing alkali metal ion impurity, filtering to obtain filtrate B, injecting blast furnace gas into the filtrate B, carbonating to obtain light CaCO 3 Producing a product; wherein the blast furnace gas is a combustible gas byproduct in the blast furnace iron-making production process, wherein CO in the blast furnace gas 2 15% of (A), 35% of CO, H 2 Content 3%, N 2 60% of hydrocarbon, 0.5% of SO 2 The content of (B) is 0.7%.
Specifically, siO in the metallurgical slag 2 35.8% of CaO, 33.1% of CaO, fe 2 O 3 Content of 2.9% Al 2 O 3 The content of 21.4 percent, the content of MgO is 2.1 percent and the content of other impurities is 8.7 percent.
Specifically, the leaching agent adopts an ammonium chloride saturated solution, and the preparation process of the ammonium chloride saturated solution comprises the following steps: and (3) putting ammonium chloride with the weight content of more than or equal to 96% into the solution, and heating to 90-100 ℃ to obtain an ammonium chloride saturated solution.
Specifically, the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
Specifically, the injection speed of the blast furnace gas is 2-10m 3 The speed of/min.
Specifically, the liquid alkali is 8% sodium hydroxide solution by volume.
Specifically, CO is collected by separating CO by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is used as indirect reduction gas in the blast furnace and is introduced into the blast furnace.
Example 3
A method for separating carbon dioxide from blast furnace gas by metallurgical slag comprises the following steps:
adjusting the pH value of the metallurgical slag to 6 by using a leaching agent and leaching Ca 2+ Filtering to obtain filtrate A, adding caustic soda solution into the filtrate to adjust pH to 11Removing alkali metal ion impurities, filtering to obtain filtrate B, and carbonating by injecting blast furnace gas into the filtrate B to obtain light CaCO 3 Producing a product; wherein the blast furnace gas is a combustible gas byproduct in the blast furnace ironmaking production process, wherein CO in the blast furnace gas 2 Is 12%, the content of CO is 26%, H 2 Content 1%, N 2 58% of hydrocarbon, 0.4% of SO 2 The content of (B) is 0.6%.
Specifically, siO in the metallurgical slag 2 34.9% of CaO, 33.0% of CaO, fe 2 O 3 2.5% of Al 2 O 3 The content is 20.9%, the content of MgO is 1.9%, and the content of other impurities is 6%.
Specifically, the leaching agent adopts an ammonium chloride saturated solution, and the preparation process of the ammonium chloride saturated solution is as follows: and (3) putting ammonium chloride with the weight content of more than or equal to 96% into the solution, and heating to 90-100 ℃ to obtain an ammonium chloride saturated solution.
Specifically, the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
Specifically, the injection speed of the blast furnace gas is 2-10m 3 The speed of/min.
Specifically, the liquid alkali is a 7% sodium hydroxide solution by volume.
Specifically, CO is collected and separated by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is used as indirect reduction gas in the blast furnace and is introduced into the blast furnace.
The test method comprises the following steps:
the metallurgical slag according to the invention was tested with a mass of 100g and then in each case according to examples 1 to 3, and Ca in the solution was determined by means of IRIS Advantage ER/S of inductively coupled plasma atomic emission spectroscopy 2+ Concentration of the obtained light CaCO 3 Drying the product, weighing the product by mass to calculate, and obtaining the following data CaCO 3 Product amount, the following data were obtained.
Further, ca according to the present invention 2+ Leaching rate = (Ca in solution) 2+ Concentration of* Volume of leachate)/(mass of metallurgical slag-CaO content in metallurgical slag) -100%.
Further, ca according to the present invention 2+ Yield = CaCO 3 mass/(Ca in solution) 2+ Concentration by volume of filtrate) 100%.
Table 1 the results of the tests are given in the following table
| Numbering | Ca 2+ Leaching Rate (%) | Ca 2+ Yield of the product |
| Example 1 | 46.3 | 98.6 |
| Example 2 | 48.2 | 99.0 |
| Example 3 | 49.5 | 99.4 |
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A method for separating carbon dioxide from blast furnace gas by metallurgical slag is characterized by comprising the following steps:
adjusting the pH value of the metallurgical slag to 5.5-6.5 by using a leaching agent and leaching Ca 2+ Then filtering to obtain filtrate A, adding liquid alkali into the filtrate to regulate pH value to 10.5-11.5 to remove alkali metal ion impurities, then filtering to obtain filtrate B, and then injecting blast furnace gas into the filtrate B to carbonate so as to obtain light CaCO 3 Producing a product; wherein the blast furnace gas is a combustible gas byproduct in the blast furnace iron-making production process, wherein CO in the blast furnace gas 2 The content of (A) is 6-15%, the content of CO is 25-35%, and H 2 Content of 0.5-3%, N 2 55-60% of hydrocarbon, 0.2-0.5% of SO 2 The content of (A) is 0.46-0.7%.
2. The method for separating carbon dioxide from blast furnace gas by using metallurgical slag according to claim 1, wherein SiO in the metallurgical slag 2 34.2 to 35.8 percent of CaO, 32.7 to 33.1 percent of CaO and Fe 2 O 3 2.3-2.9% of Al 2 O 3 20.6-21.4% of MgO, 1.5-2.1% of MgO and 4.7-8.7% of other impurities.
3. The method for separating the carbon dioxide from the blast furnace gas by the metallurgical slag according to claim 1, wherein the leaching agent is an ammonium chloride saturated solution, and the ammonium chloride saturated solution is prepared by the following steps: and (3) putting ammonium chloride with the weight content of more than or equal to 96% into the solution, and heating to 90-100 ℃ to obtain an ammonium chloride saturated solution.
4. The method for separating carbon dioxide from blast furnace gas by metallurgical slag according to claim 3, wherein the feeding temperature of the leaching agent is 100 +/-2 ℃, and the feeding speed is 40-60 ml/min.
5. The metallurgical slag separation height of claim 1Method for the carbon dioxide in blast furnace gas, characterized in that the blast furnace gas is injected at a velocity of 2-10m 3 The speed of/min.
6. The method for separating carbon dioxide from blast furnace gas by using metallurgical slag according to claim 1, wherein the liquid alkali is 5-8% sodium hydroxide solution by volume.
7. The method of claim 1, wherein the CO is collected from the blast furnace gas by separating the CO by carbonation 2 The blast furnace gas passes through an ammonia gas recovery tower to recover ammonia gas, and then the residual gas is taken as indirect reducing gas in the blast furnace and is introduced into the blast furnace.
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| CN202211120733.XA CN115354099A (en) | 2022-09-15 | 2022-09-15 | Method for separating carbon dioxide in blast furnace gas from metallurgical slag |
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| CN202211120733.XA CN115354099A (en) | 2022-09-15 | 2022-09-15 | Method for separating carbon dioxide in blast furnace gas from metallurgical slag |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020579A (en) * | 2006-03-27 | 2007-08-22 | 中国人民解放军国防科学技术大学 | Process of preparing high purity light calcium carbonate fine powder with carbide residue |
| KR20130026820A (en) * | 2011-09-06 | 2013-03-14 | 주식회사 포스코 | Apparatus and method for treating slag |
| CN109231249A (en) * | 2018-09-25 | 2019-01-18 | 太原理工大学 | A kind of high efficiency extraction blast furnace slag active constituent and carbonate fixed CO2The method for producing calcium carbonate |
| CN113913571A (en) * | 2021-09-30 | 2022-01-11 | 武汉钢铁有限公司 | Device for separating carbon dioxide in blast furnace gas by using metallurgical slag and separation method thereof |
| US20220024778A1 (en) * | 2018-12-04 | 2022-01-27 | Aalto University Foundation Sr | Method of extracting and carbonating calcium from alkaline industrial waste or by-product materials |
-
2022
- 2022-09-15 CN CN202211120733.XA patent/CN115354099A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020579A (en) * | 2006-03-27 | 2007-08-22 | 中国人民解放军国防科学技术大学 | Process of preparing high purity light calcium carbonate fine powder with carbide residue |
| KR20130026820A (en) * | 2011-09-06 | 2013-03-14 | 주식회사 포스코 | Apparatus and method for treating slag |
| CN109231249A (en) * | 2018-09-25 | 2019-01-18 | 太原理工大学 | A kind of high efficiency extraction blast furnace slag active constituent and carbonate fixed CO2The method for producing calcium carbonate |
| US20220024778A1 (en) * | 2018-12-04 | 2022-01-27 | Aalto University Foundation Sr | Method of extracting and carbonating calcium from alkaline industrial waste or by-product materials |
| CN113913571A (en) * | 2021-09-30 | 2022-01-11 | 武汉钢铁有限公司 | Device for separating carbon dioxide in blast furnace gas by using metallurgical slag and separation method thereof |
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