CN112176133A - Recycling process for pot-type hot-stewed slag and steel slag - Google Patents
Recycling process for pot-type hot-stewed slag and steel slag Download PDFInfo
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- CN112176133A CN112176133A CN202011054056.7A CN202011054056A CN112176133A CN 112176133 A CN112176133 A CN 112176133A CN 202011054056 A CN202011054056 A CN 202011054056A CN 112176133 A CN112176133 A CN 112176133A
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- slag
- steel
- steel slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
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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
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
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Abstract
The invention relates to the technical field of steel making, in particular to a recovery treatment process for pot-type hot-stewed slag and steel slag, which comprises the following process steps: the first step is as follows: after slag is discharged from steel making, the slag tank is transported to a slag span, the steel slag is poured on a crushed slag bed for rolling and crushing, and water is sprayed for cooling; because a small amount of water is added for natural cooling, the slag span has higher steam temperature and certain corrosion to the slag span, and meanwhile, the high-temperature environment in the slag span is poorer; the second step is that: placing the crushed and cooled steel slag in a closed pressure container, spraying water to form saturated steam pressure, and carrying out pressure heat braising stabilization treatment on the steel slag; and thirdly, crushing, screening and magnetically separating the thermally stewed steel slag, and separating the steel slag, magnetic separation powder and tailings. The process method provided by the invention has low cost, can fully recover the slag steel, and enables the tailings to meet the use requirements of the building material industry.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a recovery treatment process for pot-type hot-braising slag and steel slag.
Background
The steel-making steel slag belongs to solid waste in the steel-making production process, and the annual production of the steel scrap of enterprises is about 60 ten thousand tons. A considerable amount of metallic iron remains in the steel slag raw slag, the primary aim of steel slag treatment is to extract the metallic iron from the steel slag to the maximum extent, return the steel slag to steel making, save resources, and how to comprehensively utilize the steel slag after iron selection, thereby realizing green circulation of steel-making solid waste. In the last two decades, most developed countries of the iron and steel industry pay attention to the treatment, development and utilization of steel slag, and the production and utilization balance is achieved. The steel slag processing and development and utilization aspects in China are late, the steel slag processing and utilization depth is not enough, how to increase the steel slag processing and comprehensive utilization, change waste into valuable, reduce pollution and convert the steel slag into products with high technical content and high added value becomes a problem to be solved urgently. At present, enterprises adopt simple water cooling on a slag separation platform, then transport the slag separation platform to a slag separation workshop to firstly carry out rough separation on large iron-containing materials, and then carry out crushing and fine separation through a slag separation system. The process requires that the steel making is cooled by a shallower slag pan, and because the volume of the slag pan is smaller and the natural cooling takes longer time, the occupied area of the slag span is larger, so that the arrangement of the slag span is tense; meanwhile, as a small amount of water is added for natural cooling, the slag span has higher steam temperature and certain corrosion to the slag span, and meanwhile, the high-temperature environment in the slag span is poorer. With the technical development of the steel industry in China and the improvement of the requirements on environmental protection, safety and energy conservation, the existing simple direct water-pumping cooling mode cannot meet the requirements. Enterprises need to upgrade and reform the existing slag treatment facilities from the aspects of environmental protection, safety and energy conservation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a recycling treatment process for pot-type hot-braising slag steel slag, which has low cost, can fully recycle the slag steel and ensures that tailings meet the use requirements of the building material industry.
The invention is realized by the following technical scheme:
a recovery treatment process for pot-type hot-stewed slag and steel slag comprises the following process steps:
the first step is as follows: after slag is discharged from steel making, the slag tank is transported to a slag span, the steel slag is poured on a crushed slag bed for rolling and crushing, and water is sprayed for cooling; because a small amount of water is added for natural cooling, the slag span has higher steam temperature and certain corrosion to the slag span, and meanwhile, the high-temperature environment in the slag span is poorer
The second step is that: placing the crushed and cooled steel slag in a closed pressure container, spraying water to form saturated steam pressure, and carrying out pressure heat braising stabilization treatment on the steel slag;
and thirdly, crushing, screening and magnetically separating the thermally stewed steel slag, and separating the steel slag, magnetic separation powder and tailings.
Optimally, the temperature of the steel slag after being cooled in the first step is 500-800 ℃.
Furthermore, the pressure of the saturated vapor pressure in the second step is 0.2-0.4 MPa.
Further, the heat-soaking time was 2.5 hours.
Advantageous effects of the invention
The recovery treatment process for the pot-type hot-stewed slag and steel slag, which is protected by the invention, has the following beneficial effects:
1. the treatment cost of the steel slag is reduced, and 0.62 ton of water is saved when 1 ton of steel slag is treated.
2. The iron-containing raw material selected from the steel slag is improved by 10 percent.
3. The qualification rate of the tailings is 100 percent.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
A recovery treatment process for pot-type hot-stewed slag and steel slag comprises the following process steps:
the first step is as follows: after slag is discharged from steel making, the slag tank is transported to a slag span, the steel slag is poured on a crushed slag bed for rolling and crushing, and water is sprayed for cooling; compared with the natural cooling by adding a small amount of water, the cooling speed is high, the temperature is lower, the corrosion to the slag bridge is reduced, and the high-temperature environment of the slag bridge is improved.
The second step is that: placing the crushed and cooled steel slag in a closed pressure container, spraying water to form saturated steam pressure, and carrying out pressure heat braising stabilization treatment on the steel slag;
the steel slag is processed by adopting a thermal-braising integrated technology, aiming at the hydrolysis characteristics of free calcium oxide (f-CaO) and free magnesium oxide (f-MgO) in the steel slag, the steel slag is thermally braided by utilizing the residual heat of the steel slag for self-decomposition and pulverization, namely:
f-CaO + H2O → Ca (OH)2 volume expansion 97.8%,
f-MgO + H2O → Mg (OH)2 with a volume expansion of 148%,
the thermally-stewed steel slag is pulverized, slag and iron are separated, f-CaO and f-MgO in the steel slag are eliminated, the volume expansion of the f-CaO and the f-MgO when meeting water is eliminated, the phenomenon that the stability is unqualified when tailings are applied is avoided, and the use requirement of building materials can be met.
And thirdly, crushing, screening and magnetically separating the thermally stewed steel slag, separating the steel slag, magnetic separation powder and tailings, wherein the separation among the steel slag, the magnetic separation powder and the tailings is thorough, and the steel slag can be fully recovered.
The specific embodiment is as follows: the temperature of the cooled steel slag is 500-800 ℃, the pressure of saturated vapor pressure is 0.2-0.4 MPa, and the hot stewing time is 2.5 h.
Experiments prove that: by adopting the process method, 0.62 ton of water can be saved by treating 1 ton of steel slag, the iron-containing raw material selected from the steel slag is improved by 10 percent, and the qualification rate of the tailings can reach 100 percent.
In conclusion, the process method provided by the invention reduces the consumption of water for slag treatment, can effectively and fully eliminate and pulverize free calcium oxide and free magnesium oxide in the slag, fully separates slag steel from tailings in the steel slag, fully recycles the slag steel, avoids the phenomenon of unqualified stability of the tailings during application, and enables the tailings to meet the use requirement of the building material industry.
Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A recovery treatment process for pot-type hot-stewed slag and steel slag is characterized by comprising the following process steps:
the first step is as follows: after slag is discharged from steel making, the slag tank is transported to a slag span, the steel slag is poured on a crushed slag bed for rolling and crushing, and water is sprayed for cooling;
the second step is that: placing the crushed and cooled steel slag in a closed pressure container, spraying water to form saturated steam pressure, and carrying out pressure heat braising stabilization treatment on the steel slag;
and thirdly, crushing, screening and magnetically separating the thermally stewed steel slag, and separating the steel slag, magnetic separation powder and tailings.
2. The recycling process of pot-type thermally-stewed steel slag according to claim 1, wherein the temperature of the steel slag after being cooled in the first step is 500-800 ℃.
3. The recycling process of pot-type thermally-stewed steel slag according to claim 1, wherein the pressure of saturated vapor pressure in the second step is 0.2-0.4 MPa.
4. The recycling process of pot-type thermally-stewed steel slag according to claim 1, characterized in that the thermal stewing time is 2.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054056.7A CN112176133A (en) | 2020-09-30 | 2020-09-30 | Recycling process for pot-type hot-stewed slag and steel slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054056.7A CN112176133A (en) | 2020-09-30 | 2020-09-30 | Recycling process for pot-type hot-stewed slag and steel slag |
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| Publication Number | Publication Date |
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| CN112176133A true CN112176133A (en) | 2021-01-05 |
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| CN202011054056.7A Pending CN112176133A (en) | 2020-09-30 | 2020-09-30 | Recycling process for pot-type hot-stewed slag and steel slag |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444847A (en) * | 2021-06-15 | 2021-09-28 | 山东永鑫环保科技有限公司 | Bottom convection conduction slag stewing method and slag stewing equipment |
| CN114015822A (en) * | 2021-12-28 | 2022-02-08 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof |
| CN115125349A (en) * | 2022-06-29 | 2022-09-30 | 中冶华天工程技术有限公司 | Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048374A (en) * | 1989-06-30 | 1991-01-09 | 上海第五钢铁厂 | A kind of converter slag treatment process and equipment thereof |
| JPH06256047A (en) * | 1993-03-03 | 1994-09-13 | Nippon Steel Corp | Method for fractionating steelmaking slag and its apparatus |
| CN102230036A (en) * | 2011-04-02 | 2011-11-02 | 中冶建筑研究总院有限公司 | Waste-heat pressure closed-loop thermal treatment method for molten steel slag |
| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN103290153A (en) * | 2013-06-05 | 2013-09-11 | 中冶建筑研究总院有限公司 | Steel slag treating technology |
| CN105063258A (en) * | 2015-08-30 | 2015-11-18 | 武汉福安神州建材有限公司 | Stainless steel slag recycling method |
-
2020
- 2020-09-30 CN CN202011054056.7A patent/CN112176133A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048374A (en) * | 1989-06-30 | 1991-01-09 | 上海第五钢铁厂 | A kind of converter slag treatment process and equipment thereof |
| JPH06256047A (en) * | 1993-03-03 | 1994-09-13 | Nippon Steel Corp | Method for fractionating steelmaking slag and its apparatus |
| CN102230036A (en) * | 2011-04-02 | 2011-11-02 | 中冶建筑研究总院有限公司 | Waste-heat pressure closed-loop thermal treatment method for molten steel slag |
| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN103290153A (en) * | 2013-06-05 | 2013-09-11 | 中冶建筑研究总院有限公司 | Steel slag treating technology |
| CN105063258A (en) * | 2015-08-30 | 2015-11-18 | 武汉福安神州建材有限公司 | Stainless steel slag recycling method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444847A (en) * | 2021-06-15 | 2021-09-28 | 山东永鑫环保科技有限公司 | Bottom convection conduction slag stewing method and slag stewing equipment |
| CN113444847B (en) * | 2021-06-15 | 2022-06-21 | 山东永鑫环保科技有限公司 | Bottom convection conduction slag stewing method and slag stewing equipment |
| CN114015822A (en) * | 2021-12-28 | 2022-02-08 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof |
| CN114015822B (en) * | 2021-12-28 | 2023-08-11 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and treatment method thereof |
| CN115125349A (en) * | 2022-06-29 | 2022-09-30 | 中冶华天工程技术有限公司 | Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag |
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Application publication date: 20210105 |