CN111270047A - Method for comprehensively treating KR desulfurization slag - Google Patents
Method for comprehensively treating KR desulfurization slag Download PDFInfo
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- CN111270047A CN111270047A CN202010107302.4A CN202010107302A CN111270047A CN 111270047 A CN111270047 A CN 111270047A CN 202010107302 A CN202010107302 A CN 202010107302A CN 111270047 A CN111270047 A CN 111270047A
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- slag
- sintering
- tailings
- flue gas
- iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for comprehensively treating KR desulfurization slag, and belongs to the technical field of comprehensive utilization of metallurgical solid waste resources. Firstly, crushing the desulphurization slag to a specified size fraction, then carrying out magnetic separation to obtain slag iron and tailings, and returning the slag iron to the steelmaking process to replace scrap steel for recycling; the tailings participate in sintering ore blending and are used for replacing sintering iron-containing raw materials and a flux according to a certain proportion, so that sintering production is facilitated. In the high-temperature process of sintering, sulfur element in tailings is SO2The active coke is adopted to treat SO in the sintering flue gas2Adsorption, adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with different concentrations.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of metallurgical solid waste resources, and particularly relates to a method for comprehensively treating KR desulfurization slag.
Background
In the traditional steelmaking process, in order to improve the purity of the smelted molten steel and improve the smelting efficiency, the steel plant has more and more strict requirements on the sulfur content of the molten iron, and a molten iron pretreatment mode is required to be adopted for desulphurization so as to reduce the sulfur content of the molten iron. The KR desulfurization method is a very mature molten iron desulfurization method, is widely applied to domestic and foreign iron and steel enterprises, is the most main device for molten iron desulfurization pretreatment at present, and has better desulfurization effect, operation cost and other indexes. The KR desulfurization method is mechanical stirring desulfurization, and the working principle of the KR desulfurization method is mainly that a desulfurizing agent consisting of lime, limestone, fluorite and the like is added into molten iron with high sulfur content, a stirring head is slowly descended into the molten iron through a mechanical lifting device to rotate, so that the molten iron in a molten iron tank forms a vortex, the desulfurizing agent and the molten iron are fully reacted by utilizing good dynamic conditions, and a desulfurization product CaS is generated, thereby achieving the purpose of desulfurization and even deep desulfurization; and finally, removing the desulfurization product to obtain the molten iron with lower sulfur content and KR desulfurization slag.
At present, the main method for treating the desulphurization slag in the steel industry is to adopt the modes of crushing, screening, magnetic separation and the like to sort out iron in the desulphurization slag and return the iron to steel-making recycling, the tailings are used in the cement concrete industry or are treated with solid wastes such as steel slag and the like, the production efficiency is low, the utilization level of valuable elements is not high, and the resource waste is caused, so that the development of the efficient resource utilization technology of the KR desulphurization slag is of great significance.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides a method for comprehensively treating KR desulfurization slag, which solves the problem of the prior art that the KR desulfurization slag is difficult to comprehensively treat.
The technical scheme is as follows: a method for comprehensively treating KR desulfurization slag comprises the following steps:
the first step is as follows: firstly, crushing the desulfurization slag to a specified size fraction;
the second step is that: then obtaining slag iron and tailings through magnetic separation, and returning the slag iron to the steel-making process to replace scrap steel for recycling;
the third step: the tailings participate in sintering ore blending and are used for replacing a sintering iron-containing raw material and a flux according to a certain proportion, so that sintering production is facilitated;
the fourth step: in the high-temperature process of sintering, sulfur element in tailings is SO2The active coke is adopted to treat SO in the sintering flue gas2Adsorption, adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with different concentrations.
Preferably, in the first step, the desulfurized slag is crushed to a specified size fraction, and the KR desulfurized slag is crushed with the particle size controlled below 5 mm.
Preferably, the second step is to obtain slag iron and tailings by magnetic separation, the slag iron with the proportion of 10-20% and the tailings with the proportion of 80-90% are obtained by magnetic separation, and the iron content of the slag iron is 76-83%.
Preferably, the calcium content of the tailings in the third step is 42-52%, the iron content is 6.2-14.2%, the sulfur content is 1.6-2.4%, and the tailings are mixed and sintered according to the proportion of 2-3% to replace quicklime or limestone.
Preferably, CaS in the KR desulfurization slag tailings is converted into CaO and SO during the high-temperature sintering process2CaO participates in the mineralization reaction of sintering, SO2Entering sintering flue gas; adding the desulphurization slag tailings, and sintering the flue gas SO2The content is 500mg/m3Increased to 1500mg/m3The sintering flue gas is desulfurized through an active coke desulfurization process, the flue gas is discharged after reaching the standard, and SO is discharged2Then is absorbed in the active coke; adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with the concentration of 93-98%.
Has the advantages that: the method not only can efficiently recycle valuable elements such as Fe, Ca and the like in the KR desulfurization slag, but also can recycle S elements harmful to the steel production process, and changes waste into valuable, so that the method for treating the KR desulfurization slag has very obvious economic benefit and environmental benefit.
Drawings
FIG. 1 is a process flow chart of the method for comprehensively treating KR desulfurization slag.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents 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 embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in figure 1, the method for comprehensively treating KR desulfurization slag comprises the following steps: .
The first step is as follows: crushing KR desulfurization slag, and controlling the granularity to be below 5 mm;
the second step is that: obtaining slag iron with the proportion of 10% and tailings with the proportion of 90% through magnetic separation, wherein the iron content of the slag iron is 76%, and returning the slag iron to the steelmaking process to replace scrap steel for recycling;
the third step: the calcium content of the tailings is 52 percent, the iron content is 6.2 percent, the sulfur content is 2.4 percent, and the tailings are mixed and sintered according to the proportion of 2 percent to replace quicklime, so that the sintering production is facilitated;
the fourth step: CaS in KR desulfurization slag tailings is converted into CaO and SO in the high-temperature sintering process2CaO participates in the mineralization reaction of sintering, SO2Entering sintering flue gas; adding the desulphurization slag tailings, and sintering the flue gas SO2The content is 500mg/m3Increased to 1500mg/m3The sintering flue gas is desulfurized through an active coke desulfurization process, the flue gas is discharged after reaching the standard, and SO is discharged2Then is absorbed in the active coke; adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is prepared by the procedures of purification and catalytic oxidationTo form sulfuric acid with the concentration of 98 percent.
Example 2
As shown in figure 1, the method for comprehensively treating KR desulfurization slag comprises the following steps: .
The first step is as follows: crushing KR desulfurization slag, and controlling the granularity to be below 5 mm;
the second step is that: performing magnetic separation to obtain 20% of slag iron and 80% of tailings, wherein the iron content of the slag iron is 83%, and returning the slag iron to the steelmaking process to replace scrap steel for recycling;
the third step: the calcium content of the tailings is 42 percent, the iron content is 14.2 percent, the sulfur content is 1.6 percent, and the tailings are mixed and sintered according to the proportion of 3 percent to replace limestone, so that the sintering production is facilitated;
the fourth step: CaS in KR desulfurization slag tailings is converted into CaO and SO in the high-temperature sintering process2CaO participates in the mineralization reaction of sintering, SO2Entering sintering flue gas; adding the desulphurization slag tailings, and sintering the flue gas SO2The content is 500mg/m3Increased to 1500mg/m3The sintering flue gas is desulfurized through an active coke desulfurization process, the flue gas is discharged after reaching the standard, and SO is discharged2Then is absorbed in the active coke; adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with 93 percent concentration.
The above examples are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A method for comprehensively treating KR desulfurization slag is characterized by comprising the following steps:
the first step is as follows: firstly, crushing the desulfurization slag to a specified size fraction;
the second step is that: then obtaining slag iron and tailings through magnetic separation, and returning the slag iron to the steel-making process to replace scrap steel for recycling;
the third step: the tailings participate in sintering ore blending and are used for replacing a sintering iron-containing raw material and a flux according to a certain proportion, so that sintering production is facilitated;
the fourth step: in the high-temperature process of sintering, sulfur element in tailings is SO2The active coke is adopted to treat SO in the sintering flue gas2Adsorption, adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with different concentrations.
2. The method for comprehensively treating KR desulfurization slag according to claim 1, which is characterized in that: and in the first step, crushing the desulfurized slag to a specified size grade is specifically carried out, wherein the crushed KR desulfurized slag is crushed, and the granularity is controlled to be less than 5 mm.
3. The method for comprehensively treating KR desulfurization slag according to claim 1, which is characterized in that: and in the second step, slag iron and tailings are obtained through magnetic separation, the slag iron with the proportion of 10-20% and the tailings with the proportion of 80-90% are obtained through magnetic separation, and the iron content of the slag iron is 76-83%.
4. The method for comprehensively treating KR desulfurization slag according to claim 1, which is characterized in that: and the third step, the tailings with calcium content of 42-52%, iron content of 6.2-14.2% and sulfur content of 1.6-2.4% are mixed and sintered according to the proportion of 2-3% to replace quicklime or limestone.
5. The method for comprehensively treating KR desulfurization slag according to claim 1, which is characterized in that: the CaS in the KR desulfurization slag tailings in the fourth step is converted into CaO and SO in the high-temperature sintering process2CaO participates in mineralization reaction of sintering, and sulfur element in tailings is SO2Entering sintering flue gas; adding the desulphurization slag tailings, and sintering the flue gas SO2The content is 500mg/m3Increased to 1500mg/m3The sintering flue gas is desulfurized through an active coke desulfurization process, and the flue gasDischarging SO after gas reaches standard2Then is absorbed in the active coke; adsorption of SO2The active coke releases SO through high-temperature desorption2To obtain rich SO2Flue gas, rich in SO2The flue gas is purified and catalyzed and oxidized to prepare sulfuric acid with the concentration of 93-98%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144268A (en) * | 1998-11-09 | 2000-05-26 | Nkk Corp | Method for operating exhaust gas desulfurizing apparatus in production of sintered ore in high blending ratio of high crystal water-containing ore |
| CN101298079A (en) * | 2008-04-28 | 2008-11-05 | 莱芜钢铁集团泰东实业有限公司 | Environmental protection process method of desulfurizing slag of hot metal |
| CN101491780A (en) * | 2009-01-21 | 2009-07-29 | 攀钢集团研究院有限公司 | Desulphurizing slag powder treatment method and desulphurizing slag reutilization method |
| CN103981304A (en) * | 2014-05-30 | 2014-08-13 | 苏州大学 | Regeneration method for molten iron desulphurization slag |
| CN104001404A (en) * | 2014-06-09 | 2014-08-27 | 中冶南方工程技术有限公司 | Moving layer type steel slag dry desulfurization equipment and desulfurization method |
| CN104789718A (en) * | 2015-03-13 | 2015-07-22 | 中冶宝钢技术服务有限公司 | Steel slag recycling method |
| CN108715930A (en) * | 2018-06-25 | 2018-10-30 | 中南大学 | A kind of discarded desulfurizing agent is applied to the processing method of sintering |
-
2020
- 2020-02-21 CN CN202010107302.4A patent/CN111270047A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144268A (en) * | 1998-11-09 | 2000-05-26 | Nkk Corp | Method for operating exhaust gas desulfurizing apparatus in production of sintered ore in high blending ratio of high crystal water-containing ore |
| CN101298079A (en) * | 2008-04-28 | 2008-11-05 | 莱芜钢铁集团泰东实业有限公司 | Environmental protection process method of desulfurizing slag of hot metal |
| CN101491780A (en) * | 2009-01-21 | 2009-07-29 | 攀钢集团研究院有限公司 | Desulphurizing slag powder treatment method and desulphurizing slag reutilization method |
| CN103981304A (en) * | 2014-05-30 | 2014-08-13 | 苏州大学 | Regeneration method for molten iron desulphurization slag |
| CN104001404A (en) * | 2014-06-09 | 2014-08-27 | 中冶南方工程技术有限公司 | Moving layer type steel slag dry desulfurization equipment and desulfurization method |
| CN104789718A (en) * | 2015-03-13 | 2015-07-22 | 中冶宝钢技术服务有限公司 | Steel slag recycling method |
| CN108715930A (en) * | 2018-06-25 | 2018-10-30 | 中南大学 | A kind of discarded desulfurizing agent is applied to the processing method of sintering |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
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