CN102206729A - Method for recycling steel slag of LF (Low Frequency) furnace - Google Patents
Method for recycling steel slag of LF (Low Frequency) furnace Download PDFInfo
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- CN102206729A CN102206729A CN2011100893760A CN201110089376A CN102206729A CN 102206729 A CN102206729 A CN 102206729A CN 2011100893760 A CN2011100893760 A CN 2011100893760A CN 201110089376 A CN201110089376 A CN 201110089376A CN 102206729 A CN102206729 A CN 102206729A
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- slag
- steel slag
- stove
- furnace
- oxidizing
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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
Abstract
The invention relates to a method for recycling steel slag of an LF (Low Frequency) furnace. The technical scheme of the invention is as follow: the method comprises the following steps of: removing metallic iron contained in the steel slag through cooling, grinding, magnetic separation and screening processes by taking the steel slag of the LF furnace as raw materials; then mixing modifiers, i.e. sulfur-containing CaO-Al2O3-SiO2-MgO series LF steel slag, a right amount of lime, and the like, and then completely oxidizing sulfur contained in the CaO-Al2O3-SiO2-MgO series LF steel slag or oxidizing to a predetermined degree at certain temperature in an appropriate heating furnace to finally obtain premelting refining slag of the LF furnace, which has excellent property, so as to achieve the purpose of recycling the steel slag in an iron and steel industry. According to the method disclosed by the invention, the recycling of the LF steel slag is completely realized; the environmental problems caused by waste slag stacking are prevented; the consumption of the raw materials, i.e. the lime and the like, is reduced; heat in the production process of the premelting refining slag is effectively utilized; and energy consumption is reduced.
Description
Technical field
The present invention relates to the recycle of metallurgical industry waste residue, relate to LF stove slag cyclic utilization method particularly.
Background technology
The LF refining furnace because have that equipment is simple, investment cost is low, advantage such as flexible operation, refining effect are good, be the maximum external refining equipment of application.Wherein, refining slag is again technique means and the prerequisite that realizes refining function such as the insulation of LF stove, deoxidation, desulfurization and absorption steel inclusion, every refining 1t molten steel, and needs consume the refining slag of 20-50kg.According to China's output of steel of 6.26 hundred million tons in 2010,, produced LF stove slag more than 6,260,000 tons at least if wherein 1/2 adopt LF stove refinery practice.Therefore, recycle the important component part that LF stove slag is a development Iron And Steel Industry recycling economy.
At present, The Recovery and Utilization of Steel Slay has cold conditions to handle and hotly returns 2 kinds of technologies.
Common cold conditions treatment process is that cooled LF stove slag is mixed in, irregular overturning on the slag mountain with bessemer furnace slag, magnetic separation processing after cooling off.Because contained metallic iron is few in this part slag, and CaO, Al
2O
3And the content of f-CaO is more, and utilising efficiency is low.Recently, Ma'anshan Iron and Steel Corp adopts online fragmentation, magnetic separation, sieving technology, and tailings after treatment is directly as the sintering fusing assistant; Anshan Iron and Steel Company distinguishes the refining slag of different heats and converter slag and deposits, and after unifying screening, magnetic separation, homogenizing, making ball and handle, utilizes as converter fluxing medium, has improved the utilising efficiency of slag.
In addition, the LF stove slag that sulphur content is lower still has dephosphorization and desulfurization potentiality, can hotly return to be used for the refining of LF stove, also can be used as the fusing assistant of converter or electric furnace.The production practice of 150 tons of LF stoves of Tang Gang first steelworks show, the Returning utilization of hot steel slag has reduced the consumption of slag making material (as lime, fluorite); Utilized the amount of residual heat will of slag, improved the stability and the thermo-efficiency of LF stove power supply initial stage electrode, alleviated the radiation of electric arc, be beneficial to the raising ladle life, reduced refractory consumption the ladle slag line layer; Reduced the quantity discharged of LF stove slag, alleviated pollution environment.Yet as shown in table 1, along with the hot recycle time of slag increases, the CaO content in the slag reduces, Al
2O
3Increase with sulphur content, sweetening power weakens.Return when surpassing more than 3 times when slag is hot, the quantity of slag reaches more than the steel 40kg per ton, influences the mixing effect of argon bottom-blowing, and refining desulfuration speed is slow, rhythm of production is nervous, so generally through after 2 hot returning, slag can only adopt the cold conditions processing mode to utilize.
Table 1 refining CaO-Al
2O
3-MgO-SiO
2Each component of slag system and molten steel terminal point sulphur massfraction
In sum, cold conditions is handled and is hotly returned two kinds of The Recovery and Utilization of Steel Slay technologies and not only do not carry out desulfurization and handle, and along with the number of times increase of recycling, sulphur content increases gradually in the slag.These slags of continuation use will increase the desulfurization difficulty in the smelting process inevitably, reduce production efficiency.This shows,, must carry out steel slag and desulfurized processing in order to realize the recycle of LF stove slag in ferrous metallurgy industry.
Summary of the invention
The object of the present invention is to provide a kind of method of recycle LF stove slag, adopt the present invention can realize the recycle of LF stove slag in Iron And Steel Industry.
It is raw material that the present invention adopts LF stove slag, behind the metallic iron in overcooling, fragmentation, magnetic separation and sieving technology removal slag, will contain the CaO-Al of sulphur
2O
3-SiO
2-MgO is that LF slag and an amount of modification agents such as lime mix the back and make in the slag sulphur complete oxidation under the certain temperature or be oxidizing to predetermined extent in suitable process furnace, final acquisition has the LF stove pro-molten refining slag of excellent properties, reaches the purpose of slag recycle in Iron And Steel Industry.It is characterized in that after peroxidation, fritting are handled, can realizing the recycle of LF stove slag:
The mixed gas of oxidizing gas oxygen or air and they and other non-oxidizing gas
1200～1600 ℃ of oxidizing temperatures
Modification agent Wingdale, lime, magnesia, quartz sand, mullite, kaolin, clay or their mixture
Wherein,
Oxygen level in the described oxidizing gas is greater than 10%;
Described oxidizing temperature is 1200～1600 ℃.In addition, in order to make the sulphur complete oxidation in the slag, (1200～1600 ℃) are incubated certain hour (0-6 hour) at a certain temperature in case of necessity;
Described modification agent is lime, magnesia, quartz sand, mullite, kaolin, clay or their mixture, and purpose is to meet smelting steel grade requirement pro-molten refining slag fully in order to obtain composition at lower cost.
The invention has the beneficial effects as follows: the one,, realize the recycle of LF slag fully, avoided having reduced raw-material consumption such as lime because waste residue is stacked the environmental problem that causes.The 2nd,, effectively utilized the heat of producing in the pro-molten refining slag process, reduced energy consumption.The 3rd, technology is simple, can directly use in existing scale operation.
Embodiment
Embodiment 1
Obtain the LF slag from steel mill, after overcooling, fragmentation, magnetic separation, screening, chemical analysis shows that composition is CaO 41%, Al
2O
335%, MgO 10%, SiO
25%, S 0.8%, MnO+FeO0.3%.In order to obtain chemical ingredients is CaO 42%, Al
2O
336%, MgO 10%, SiO
25%, S＜0.05%, the pro-molten refining slag of MnO+FeO＜0.5%.It is behind 90% the Wingdale that the mode that employing adds adds 3.5% purity, be oxidizing gas with the air with slag be heated to 1300 ℃ and be incubated 2 hours after make that sulphur is removed to less than 0.05% in the slag, continuing then heats up makes slag ingredient even, can obtain the pro-molten refining slag that composition meets the demands fully.
Embodiment 2
Obtain the LF slag from steel mill, after overcooling, fragmentation, magnetic separation, screening, chemical analysis shows that composition is CaO 41%, Al
2O
335%, MgO 12%, SiO
25%, S 0.8%, MnO+FeO0.3%.In order to obtain chemical ingredients is CaO 41%, Al
2O
335%, MgO 10%, SiO
26%, S＜0.1%, the pro-molten refining slag of MnO+FeO＜0.5%.The mode that employing adds adds 50% lime that contains CaO90%, 5% contain the magnesia mixing of MgO90% after, be oxidizing gas with the air with slag be heated to 1250 ℃ and be incubated 1 hour after make that sulphur is removed to less than 0.1% in the slag, continuing then heats up makes slag ingredient even, can obtain the pro-molten refining slag that composition meets the demands fully.
Claims (2)
1. the method for a recycle LF stove slag is characterized in that can realizing the recycle of LF stove slag after peroxidation, fritting are handled:
The mixed gas of oxidizing gas oxygen or air and they and other non-oxidizing gas
1200～1600 ℃ of oxidizing temperatures
Modification agent Wingdale, lime, magnesia, quartz sand, mullite, kaolin, clay or their mixture
Wherein,
The massfraction of the oxygen in the described oxidizing gas is greater than 10%;
Described oxidizing temperature is 1200～1600 ℃.In addition, in order to make the sulphur complete oxidation in the slag, in case of necessity can certain temperature in temperature-rise period under (1200～1600 ℃) insulation certain hour (0-6 hour);
Described modification agent is Wingdale, lime, magnesia, quartz sand, mullite, kaolin, clay or their mixture, and purpose is to meet smelting steel grade requirement pro-molten refining slag fully in order to obtain composition at lower cost.
2. the method for the described recycle LF of claim 1 a stove slag, its feature adopts following method: adopting LF stove slag is raw material, after overcooling, fragmentation, magnetic separation and sieving technology are removed metallic iron in the slag, will contain the CaO-Al of sulphur
2O
3-SiO
2-MgO is that LF slag and an amount of modification agents such as lime mix the back and make in the slag sulphur complete oxidation under the certain temperature or be oxidizing to predetermined extent in suitable process furnace, the final LF stove pro-molten refining slag that obtains to have excellent properties is realized the recycle of slag LF stove slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100893760A CN102206729A (en) | 2011-04-11 | 2011-04-11 | Method for recycling steel slag of LF (Low Frequency) furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100893760A CN102206729A (en) | 2011-04-11 | 2011-04-11 | Method for recycling steel slag of LF (Low Frequency) furnace |
Publications (1)
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|---|---|
| CN102206729A true CN102206729A (en) | 2011-10-05 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN103045778A (en) * | 2013-01-10 | 2013-04-17 | 唐山国丰钢铁有限公司 | Recycling method of LF scrap ladle slag inclusion |
| CN104046710A (en) * | 2014-07-07 | 2014-09-17 | 中钢集团武汉安全环保研究院有限公司 | Method for preparing steelmaking flux from refining waste slag under thermal state |
| CN104109737A (en) * | 2014-07-25 | 2014-10-22 | 北京科技大学 | Process method for thermal-state cyclic utilization of LF refining slag |
| CN104109735A (en) * | 2014-07-25 | 2014-10-22 | 北京科技大学 | Process method for LF refining slag desulfurization and metallurgical internal cyclic utilization |
| CN104651553A (en) * | 2015-03-17 | 2015-05-27 | 马鞍山市华东冶金科技发展有限公司 | Steel slag modifier |
| CN104694679A (en) * | 2015-03-17 | 2015-06-10 | 马鞍山市华东冶金科技发展有限公司 | Steel slag heat recycling method |
| CN109675905A (en) * | 2018-11-28 | 2019-04-26 | 东莞理工学院 | A kind of Comprehensive Utilization of Steel Slag processing system and processing method |
| CN110863103A (en) * | 2019-11-20 | 2020-03-06 | 北方民族大学 | Steel slag treatment method for improving recovery rate of iron in steel slag |
| CN115418435A (en) * | 2022-08-04 | 2022-12-02 | 河钢乐亭钢铁有限公司 | Refining slag online modification method |
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| CN101864501A (en) * | 2010-06-22 | 2010-10-20 | 新兴河北工程技术有限公司 | Method for recycling iron from steel slag |
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2011
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560131B (en) * | 2011-12-28 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560006B (en) * | 2011-12-28 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN103045778A (en) * | 2013-01-10 | 2013-04-17 | 唐山国丰钢铁有限公司 | Recycling method of LF scrap ladle slag inclusion |
| CN104046710A (en) * | 2014-07-07 | 2014-09-17 | 中钢集团武汉安全环保研究院有限公司 | Method for preparing steelmaking flux from refining waste slag under thermal state |
| CN104109735B (en) * | 2014-07-25 | 2016-02-24 | 北京科技大学 | The processing method that the sulphur removal of a kind of LF refining slag and metallurgical internal recycle utilize |
| CN104109737A (en) * | 2014-07-25 | 2014-10-22 | 北京科技大学 | Process method for thermal-state cyclic utilization of LF refining slag |
| CN104109735A (en) * | 2014-07-25 | 2014-10-22 | 北京科技大学 | Process method for LF refining slag desulfurization and metallurgical internal cyclic utilization |
| CN104109737B (en) * | 2014-07-25 | 2016-08-24 | 北京科技大学 | The hot process recycled of a kind of LF refining slag |
| CN104651553A (en) * | 2015-03-17 | 2015-05-27 | 马鞍山市华东冶金科技发展有限公司 | Steel slag modifier |
| CN104694679A (en) * | 2015-03-17 | 2015-06-10 | 马鞍山市华东冶金科技发展有限公司 | Steel slag heat recycling method |
| CN109675905A (en) * | 2018-11-28 | 2019-04-26 | 东莞理工学院 | A kind of Comprehensive Utilization of Steel Slag processing system and processing method |
| CN110863103A (en) * | 2019-11-20 | 2020-03-06 | 北方民族大学 | Steel slag treatment method for improving recovery rate of iron in steel slag |
| CN110863103B (en) * | 2019-11-20 | 2021-07-27 | 北方民族大学 | Steel slag treatment method for improving recovery rate of iron in steel slag |
| CN115418435A (en) * | 2022-08-04 | 2022-12-02 | 河钢乐亭钢铁有限公司 | Refining slag online modification method |
| CN115418435B (en) * | 2022-08-04 | 2023-08-25 | 河钢乐亭钢铁有限公司 | Refining slag online modification method |
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Application publication date: 20111005 |