Ammonia-acetic acid-ammonium acetate catalytic system for ferrous metallurgy
By designing an ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy, ammonia, acetic acid, and ammonium acetate are used to catalyze the reaction of steel slag with carbon dioxide to produce high-purity calcium carbonate. This solves the problems of poor steel slag treatment and high energy consumption for carbon capture, and realizes resource reuse and carbon emission reduction.
Patent Information
- Application Number
- CN202422779511.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-14
AI Technical Summary
Existing technologies for steel slag treatment are inadequate, affecting cement performance and lacking carbon emission reduction capabilities. Carbon capture technology is energy-intensive and cannot co-process solid waste.
The design of an ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy includes a steel slag dissolution system, a decarburization reactor, and a catalyst regeneration system. The system utilizes ammonia, acetic acid, and ammonium acetate to catalyze the reaction of steel slag with carbon dioxide to produce high-purity calcium carbonate.
This approach enables the high-value-added resource utilization of steel slag, achieves the goal of carbon capture, reduces energy consumption, and coordinates the disposal of solid waste.
Smart Images
Figure CN223542754U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of iron and steel metallurgy technology, specifically to an ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy. Background Technology
[0002] In the field of iron and steel metallurgy, a large amount of steel slag is generated. Currently, the common method for disposing of solid waste steel slag is to first treat it simply and then mix it into cement clinker. However, because steel slag is highly alkaline, it reduces the performance of cement, making this method unsuitable. Meanwhile, with the increasing popularity of green production, steel mills and other industrial manufacturers face the task of carbon reduction and carbon neutrality.
[0003] In flue gas decarbonization technologies, most publicly disclosed techniques include the thermal potassium alkali method, the organic amine method, adsorption, and membrane separation. These technologies enrich carbon dioxide in flue gas to obtain carbon dioxide with a purity greater than 99%, which is then stored and treated. However, these carbon capture technologies are very energy-intensive and do not have the function of co-processing solid waste.
[0004] Meanwhile, acetic acid or ammonium acetate has the chemical property of dissolving steel slag. Dissolving steel slag with acetic acid or ammonium acetate yields soluble products such as ammonia, calcium acetate, and magnesium acetate, which can be used to absorb carbon dioxide from flue gas. During the carbon dioxide absorption process, acetic acid or ammonium acetate is regenerated, achieving recycling.
[0005] Therefore, it is necessary to design an ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy. Utility Model Content
[0006] The purpose of this invention is to provide an ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy, so as to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] An ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy includes a steel slag dissolution system, a decarburization reactor, and a catalyst regeneration system connected in sequence. The steel slag dissolution system is connected to the catalyst regeneration system, and an ammonia scrubbing tower is connected to the top of the decarburization reactor.
[0009] As a further embodiment of this utility model: the steel slag dissolving system includes a steel slag dissolving tank, a primary solid-liquid separation tank and a calcium acetate solution tank connected in sequence. The steel slag dissolving tank is connected to a catalyst regeneration system, the calcium acetate solution tank is connected to a decarbonization reactor, and a decarbonization reactor feed pump is provided between the calcium acetate solution tank and the decarbonization reactor.
[0010] As a further embodiment of this utility model: the catalyst regeneration system includes a secondary solid-liquid separation tank connected to the bottom of the decarbonization reactor. The secondary solid-liquid separation tank is sequentially connected to an ammonia distillation tower feed pump, an ammonia distillation tower, and an ammonia distillation tower bottom discharge pump. The top of the ammonia distillation tower is connected to the decarbonization reactor, and the ammonia distillation tower bottom discharge pump is connected to a steel slag dissolving tank.
[0011] In summary, the beneficial effects of this utility model are as follows: by utilizing strongly alkaline steel slag, and with the assistance of ammonia, acetic acid and ammonium acetate as catalysts, the steel slag reacts with carbon dioxide to produce high-purity calcium carbonate products. This not only achieves the purpose of carbon capture, but also realizes the high-value-added resource reuse of steel slag. Attached Figure Description
[0012] Figure 1 This is a structural diagram of an ammonia-acetic acid-ammonium acetate catalytic system used in iron and steel metallurgy.
[0013] In the diagram: 1. Steel slag dissolving tank; 2. Primary solid-liquid separation tank; 3. Calcium acetate solution tank; 4. Decarbonization reactor; 5. Secondary solid-liquid separation tank; 6. Ammonia distillation tower; 7. Ammonia washing tower; 8. Decarbonization reactor feed pump; 9. Ammonia distillation tower feed pump; 10. Ammonia distillation tower bottom discharge pump. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Example
[0016] Please see Figure 1 ,like Figure 1 As shown, the ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy includes a steel slag dissolution system, a decarburization reactor 4, and a catalyst regeneration system connected in sequence. The steel slag dissolution system is connected to the catalyst regeneration system, and an ammonia scrubbing tower 7 is connected to the top of the decarburization reactor 4.
[0017] The steel slag dissolution system includes a steel slag dissolution tank 1, a primary solid-liquid separation tank 2, and a calcium acetate solution tank 3 connected in sequence. The steel slag dissolution tank 1 is connected to a catalyst regeneration system, and the calcium acetate solution tank 3 is connected to a decarbonization reactor 4. A decarbonization reactor feed pump 8 is provided between the calcium acetate solution tank 3 and the decarbonization reactor 4.
[0018] The catalyst regeneration system includes a secondary solid-liquid separation tank 5 connected to the bottom of the decarbonization reactor 4. The secondary solid-liquid separation tank 5 is sequentially connected to an ammonia distillation tower feed pump 9, an ammonia distillation tower 6, and an ammonia distillation tower bottom discharge pump 10. The top of the ammonia distillation tower 6 is connected to the decarbonization reactor 4, and the ammonia distillation tower bottom discharge pump 10 is connected to the steel slag dissolving tank 1.
[0019] The process method for using ammonia-acetic acid-ammonium acetate catalysis in iron and steel metallurgy includes the following steps:
[0020] S1. The finely ground steel slag enters the steel slag dissolving tank 1, where it dissolves under the catalytic action of acetic acid and ammonium acetate. The dissolved material then enters the primary solid-liquid separation tank 2, where the following chemical reaction occurs:
[0021] CaO.SiO2+HAc→Ca(Ac)2+H2O+SiO2
[0022] MgO.SiO2+HAc→Mg(Ac)2+H2O+SiO2;
[0023] S2. Ammonia gas is injected into the primary solid-liquid separation tank 2 to adjust the pH value and filter out solid impurities. The remaining calcium acetate solution enters the calcium acetate solution tank 3, where the following chemical reaction occurs:
[0024] Mg(Ac)2+NH3+H2O→Mg(OH)2↓+NH4Ac;
[0025] S3. Calcium acetate is fed into decarbonization reactor 4 by decarbonization reactor feed pump 8. Flue gas enters decarbonization reactor 4 at the same time. Ammonia is injected as a catalyst. The generated material enters the secondary solid-liquid separation tank 5 from the bottom of decarbonization reactor 4. The remaining flue gas is sent to ammonia scrubbing tower 7 from the top of decarbonization reactor 4.
[0026] The following chemical reaction occurs in decarbonization reactor 4:
[0027] Ca(Ac)2+NH3+CO2→CaCO3↓+NH4Ac
[0028] S4, after the secondary solid-liquid separation tank 5 filters out calcium carbonate from the material, the remaining filtrate is sent to the ammonia distillation tower 6 by the ammonia distillation tower feed pump 9.
[0029] S5. The ammonia gas distilled from the top of the ammonia distillation tower 6 is returned to the decarbonization reactor 4. The acetic acid and ammonium acetate solution at the bottom of the tower is returned to the steel slag dissolving tank 1 via the ammonia distillation tower bottom pump 10. Inside the ammonia distillation tower, ammonium acetate undergoes a hydrolysis reaction to produce ammonia and acetic acid, as follows:
[0030] NH4Ac + H2O → NH4OH + HAc
[0031] NH4OH→NH3+H2O;
[0032] S6. The flue gas entering the ammonia scrubbing tower 7 reacts with sulfuric acid to produce ammonium sulfate, and the remaining flue gas is discharged.
[0033] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and features of this application. Solutions or features that are prior art or common knowledge to those skilled in the art will not be described in detail in the above embodiments.
[0034] Furthermore, the technical solutions of this application are not limited to the above embodiments. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. An ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy, characterized in that, The system includes a steel slag dissolution system, a decarbonization reactor (4), and a catalyst regeneration system connected in sequence. The steel slag dissolution system is connected to the catalyst regeneration system. The steel slag dissolution system includes a steel slag dissolution tank (1), a primary solid-liquid separation tank (2), and a calcium acetate solution tank (3) connected in sequence. The steel slag dissolution tank (1) is connected to the catalyst regeneration system. The calcium acetate solution tank (3) is connected to the decarbonization reactor (4). A decarbonization reactor feed pump (8) is provided between the calcium acetate solution tank (3) and the decarbonization reactor (4). An ammonia scrubbing tower (7) is connected to the top of the decarbonization reactor (4).
2. The ammonia-acetic acid-ammonium acetate catalytic system for iron and steel metallurgy according to claim 1, characterized in that, The catalyst regeneration system includes a secondary solid-liquid separation tank (5) connected to the bottom of the decarbonization reactor (4). The secondary solid-liquid separation tank (5) is sequentially connected to an ammonia distillation tower feed pump (9), an ammonia distillation tower (6), and an ammonia distillation tower bottom discharge pump (10). The top of the ammonia distillation tower (6) is connected to the decarbonization reactor (4), and the ammonia distillation tower bottom discharge pump (10) is connected to the steel slag dissolving tank (1).