CN103627830A - Molten iron desulphurization slag pre-processing method, slag-iron separating method and application of by-products - Google Patents
Molten iron desulphurization slag pre-processing method, slag-iron separating method and application of by-products Download PDFInfo
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- CN103627830A CN103627830A CN201310635087.5A CN201310635087A CN103627830A CN 103627830 A CN103627830 A CN 103627830A CN 201310635087 A CN201310635087 A CN 201310635087A CN 103627830 A CN103627830 A CN 103627830A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a molten iron desulphurization slag pre-processing method, a slag-iron separating method and application of by-products, and belongs to the metallurgy field. The first technical problem that the invention aims to solve is to provide the molten iron desulphurization slag pre-processing method which can control dust and is environment-friendly, and the second technical problem that the invention aims to solve is to provide the slag-iron separating method and application of molten iron desulphurization slag pre-processed by adopting the pre-processing method. The technical scheme adopted by the invention is that the desulphurization slag is subjected to tank-watering, hot disintegration, striking and smashing, screening, grinding, and magnetic separation for recycling iron from the molten iron desulphurization slag; while recycling the metallic iron from the molten iron desulphurization slag, keeping the MFe in tailings smaller than 1%, so that the tailings can be used in cement production.
Description
Technical field
The invention belongs to field of metallurgy, be specifically related to the application of a kind of desulfurizing slag of hot metal pre-treatment and slag, iron separation method and by product.
Background technology
Along with modern industry is produced and scientific and technical developing rapidly, the requirement of steel product quality is improved day by day.For example, for fear of steel billet, produce internal fissure and obtain good surface quality, requiring the sulphur content of ordinary steel to be less than 0.020%.Requiring the steel of low-sulfur like this, is what be difficult to produce with traditional blast furnace ironmaking one converter steelmaking process, only before steel-making, adds and adds that furnace outer refining process could produce after molten iron pre-desulfurization operation, steel-making.Particularly v-bearing titanomagnetite smelting, because its molten steel sulfur content is higher, will produce a large amount of desulfurization slag every year, and as calculated by producing 5500000 tons of molten iron per year, the annual desulfurization quantity of slag producing is up to 200,000 tons of left and right.Molten iron pre-desulfurization has become one of indispensable operation of optimizing metallurgical production technique, and it can reduce the coke ratio of ironmaking and boost productivity, the lime consumption amount of minimizing steel-making and the quantity of slag etc., thus reduced production cost.
These desulfurization slag are finally turned over and are abandoned processing to slag field by transportation by railroad.And vexed and separated for the dust suppression heat of skimming, domestic rarely have report, fails to find favourable approach always, realizes heat vexed and separated.
Summary of the invention
First technical problem solved by the invention is to provide the desulfurizing slag of hot metal pretreatment process of a kind of energy dust suppression.
The present invention solves the problems of the technologies described above adopted technical scheme to comprise the following steps:
A, band tank are fetched water: water spray desulfurizing slag of hot metal slag ladle, is reduced to desulfurization slag temperature in tank below 50 ℃;
B, heat are vexed: desulfurizing slag of hot metal is poured in pit, vexed at least 24 hours of heat hot vexed slag, if hot, there is steam when vexed, moisturizing is not to till having steam to occur.
Second technical problem solved by the invention is to provide the vexed slag of heat that a kind of desulfurizing slag of hot metal obtains through preceding method pre-treatment and carries out slag, the method for iron separation and the application of by product.
The present invention is that the technical scheme that this technical problem of solution adopts comprises the following steps:
A, hot vexed slag are through the screening of 120mm～150mm aperture sieve extension set, and screen underflow is standby; Screen overflow is through breaking to continuing fragmentation, and granularity cannot reduce rear separated selected iron and break slag;
The slag of breaking of b, step a gained screen underflow and step a gained sieves through at least 2 times: the screening of via hole diameter 50mm～100mm sieve apparatus, and screen overflow obtains selected iron and tailings through ore grinding, magnetic separation, and screen underflow is standby;
C, step b gained screen underflow are through the screening of 5mm～15mm sieve apparatus, and screen overflow obtains selected iron and tailings through wet ball-milling, magnetic separation, and screen underflow obtains selected iron and tailings through wet ball-milling, magnetic separation;
Wherein, described selected iron is that metal Ferrum content is greater than 70%w/w, the iron block that granularity is 5mm～60mm.
Preferably, described in step a, breaking is from 4m～10m eminence free-falling or break with equal dynamics with 10t～15t iron hammer.
Preferably, described in step b and step c, sieve apparatus is vibratory screening apparatus.
Preferably, described in step b, ore grinding is wet ball-milling after autogenous grinding.
Preferably, described in step c, 5mm～15mm vibratory screening apparatus in aperture is in series by 1 above aperture 5mm～15mm vibratory screening apparatus.
Concrete, MFe < 1% in the tailings that wet ball-milling step produces described in step b, the application in cement ingredient.
Beneficial effect of the present invention:
1, desulfurizing slag of hot metal is carried out to dust suppression heat vexed.Vexed by the after heat of fetching water of band tank, red slag is reduced, control and reduce the appearance of tumble process dust raising phenomenon, red slag explosion phenomenon, realize vexed to the dust suppression heat of desulfurizing slag of hot metal.
2, reduce equipment pressure, enhance productivity; Desulfurizing slag of hot metal is all recycled.By desulfurizing slag of hot metal being carried out to gradation sizing, fragmentation, magnetic separation, realize the recovery of iron in desulfurizing slag of hot metal and reduce in tailings MFe content to < 1%, improve the recycle efficiency of tailings in cement ingredient, by its all prods resource utilization; Graded crushing simultaneously, magnetic separation can effectively reduce equipment pressure and enhance productivity.
Embodiment
Below by embodiment, the present invention is further described.
Desulfurizing slag of hot metal pretreatment process and slag thereof, iron separation method comprise the steps:
Wherein desulfurizing slag of hot metal pretreatment process step is as follows:
A, band tank are fetched water: water spray desulfurizing slag of hot metal slag ladle, is reduced to desulfurization slag temperature in tank below 50 ℃;
B, heat are vexed: desulfurizing slag of hot metal is poured in pit, vexed at least 24 hours of heat hot vexed slag, if hot, there is steam when vexed, moisturizing is not to till having steam to occur.
Contriver by experiment, finds that band tank fetches water, slag water consumption per ton 330～600kg, and comparing traditional hot application amount of fetching water is 43t/ tank, can reduce water consumption 28t/ tank, and turns over smoke dust after slag, has good environmental benefit.Because desulfurization slag heat is large, directly processing meeting damage equipment, vexed by heat, can reach the object of cooling and efflorescence, can make raw meal particle size more than 70%w/w be less than 300mm, alleviates the production pressure of subsequent handling.
Wherein, the slag of hot vexed slag, iron separation method step are as follows:
A, hot vexed slag are through the screening of 120mm～150mm aperture sieve extension set, and screen underflow is standby; Screen overflow is through breaking to continuing fragmentation, and granularity cannot reduce rear separated selected iron (MFe>70%) and break slag;
The slag of breaking of b, step a gained screen underflow and step a gained sieves through at least 2 times: the screening of via hole diameter 50mm～100mm sieve apparatus, and screen overflow obtains selected iron (MFe>70%) and tailings through ore grinding, magnetic separation, and screen underflow is standby;
C, step b gained screen underflow sieve through 5mm～15mm sieve apparatus, screen overflow obtains selected iron (MFe>85%) and tailings through wet ball-milling, magnetic separation, and screen underflow obtains selected iron (MFe>85%) and tailings through wet ball-milling, magnetic separation;
Wherein, described selected iron is that metal Ferrum content is greater than 70%w/w(MFe>70%), the iron block that granularity is 5mm～60mm.
Preferably, described in step a, breaking is from 4m～10m eminence free-falling or break with equal dynamics with 10t～15t iron hammer.
Preferably, described in step b and step c, sieve apparatus is vibratory screening apparatus.
Preferably, described in step b, ore grinding is wet ball-milling after autogenous grinding.
Preferably, described in step c, 5mm～15mm vibratory screening apparatus in aperture is in series by 1 above aperture 5mm～15mm vibratory screening apparatus.
Concrete, MFe < 1% in the tailings that wet ball-milling step produces described in step b, the application in cement ingredient.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Desulfurizing slag of hot metal band tank is fetched water 24 hours, slag ladle skin temperature is reduced to below 50 ℃.After band tank is fetched water and finished, desulfurizing slag of hot metal (45 ℃) is poured into in pit, to start heat vexed, if hot, occurs steam when vexed, depending on hot quantity of steam size moisturizing when vexed, until do not have steam to occur, hot vexed 25h.After heat is vexed, the diagrid through 120mm aperture sieves successively, screen overflow is by breaking separated selected iron (MFe=77%) and breaking slag, break the double-deck screen shale shaker that slag and screen underflow enter 80mm and 10mm aperture, separated selected iron (MFe=75%) and tailings after wet ball-milling again after the screen overflow autogenous grinding of 80mm, 80mm screen underflow is through the vibratory screening apparatus of the 10mm of lower floor, 1 10mm vibratory screening apparatus of the 10mm of lower floor vibratory screening apparatus series connection; The vibratory screening apparatus screen overflow of 10mm is separated selected iron (MFe=88%) and the tailings of obtaining after wet ball-milling, the screen underflow of 10mm screen underflow and the 10mm of double-deck screen shale shaker is separated selected iron (MFe=87%) and tailings after wet ball-milling, MFe < 1% in tailings after wet ball-milling, after drying, moisture is less than 10% and can be used in cement.
Embodiment 2
Desulfurizing slag of hot metal band tank is fetched water 26 hours, slag ladle skin temperature is reduced to below 50 ℃.After band tank is fetched water and finished, desulfurizing slag of hot metal (35 ℃) is poured into in pit, to start heat vexed, if hot, occurs steam when vexed, depending on hot quantity of steam size moisturizing when vexed, until do not have steam to occur, hot vexed 28h.After heat is vexed, the diagrid through 150mm aperture sieves successively, screen overflow is by breaking separated selected iron (MFe=78%) and breaking slag, break the double-deck screen shale shaker that slag and screen underflow enter 100mm and 15mm aperture, separated selected iron (MFe=76%) and tailings after wet ball-milling again after the screen overflow autogenous grinding of 100mm, 80mm screen underflow is through the vibratory screening apparatus of the 15mm of lower floor; 1 15mm vibratory screening apparatus of the 15mm of lower floor vibratory screening apparatus series connection; The vibratory screening apparatus screen overflow of 15mm is separated selected iron (MFe=88%) and the tailings of obtaining after wet ball-milling, the screen underflow of 15mm screen underflow and the 15mm of double-deck screen shale shaker is separated selected iron (MFe=86%) and tailings after wet ball-milling, MFe < 1% in tailings after wet ball-milling, after drying, moisture is less than 10% and can be used in cement.
Claims (7)
1. desulfurizing slag of hot metal pretreatment process, is characterized in that comprising the following steps:
A, band tank are fetched water: water spray desulfurizing slag of hot metal slag ladle, is reduced to desulfurization slag temperature below 50 ℃;
B, heat are vexed: desulfurizing slag of hot metal is poured in pit, vexed at least 24 hours of heat hot vexed slag, if hot, there is steam when vexed, moisturizing is not to till having steam to occur.
2. the slag of hot vexed slag, iron separation method, the vexed slag of described heat is by method preparation described in claim 1 and obtain; It is characterized in that: comprise the following steps:
A, hot vexed slag are through the screening of 120mm～150mm aperture sieve extension set, and screen underflow is standby; Screen overflow is through breaking to continuing fragmentation, and granularity cannot reduce rear separated selected iron and break slag;
The slag of breaking of b, step a gained screen underflow and step a gained sieves through at least 2 times: the screening of via hole diameter 50mm～100mm sieve apparatus, and screen overflow obtains selected iron and tailings through ore grinding, magnetic separation, and screen underflow is standby;
C, step b gained screen underflow are through the screening of 5mm～15mm sieve apparatus, and screen overflow obtains selected iron and tailings through wet ball-milling, magnetic separation, and screen underflow obtains selected iron and tailings through wet ball-milling, magnetic separation;
Wherein, described selected iron is that metal Ferrum content is greater than 70%w/w, the iron block that granularity is 5mm～60mm.
3. the slag of the vexed slag of heat according to claim 2, iron separation method, is characterized in that: described in step a, breaking is from 4m～10m eminence free-falling or break with equal dynamics with 10t～15t iron hammer.
4. the slag of the vexed slag of heat according to claim 2, iron separation method, is characterized in that: described in step b and step c, sieve apparatus is vibratory screening apparatus.
5. the slag of the vexed slag of heat according to claim 2, iron separation method, is characterized in that: described in step b, ore grinding is wet ball-milling after autogenous grinding.
6. the slag of the vexed slag of heat according to claim 2, iron separation method, is characterized in that: described in step c, 5mm～15mm vibratory screening apparatus in aperture is in series by 1 above aperture 5mm～15mm vibratory screening apparatus.
7. the application of tailings claimed in claim 2 in cement ingredient, is characterized in that: MFe < 1% in described tailings.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104152606A (en) * | 2014-09-01 | 2014-11-19 | 攀枝花钢城集团有限公司 | A method for separating slag from iron of waste slag produced by electric furnace smelting |
| CN104313208A (en) * | 2014-10-16 | 2015-01-28 | 攀枝花钢城集团有限公司 | Steelmaking slag separation method |
| CN106902957A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of method that wet magnetic separation processes molten iron pretreatment slag |
| CN108193005A (en) * | 2017-12-29 | 2018-06-22 | 吉林建龙钢铁有限责任公司 | A kind of method of desulfurization solid waste recycling |
| CN111250034A (en) * | 2020-03-24 | 2020-06-09 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN113528719A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | KR desulfurization slag disintegrating slag explosion-proof method |
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| JP2001048605A (en) * | 1999-07-29 | 2001-02-20 | Nippon Steel Corp | Treatment of steelmaking slag for cement |
| CN102839240A (en) * | 2011-06-21 | 2012-12-26 | 南京梅山冶金发展有限公司 | Comprehensive processing utilization production technology of steel slag |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152606A (en) * | 2014-09-01 | 2014-11-19 | 攀枝花钢城集团有限公司 | A method for separating slag from iron of waste slag produced by electric furnace smelting |
| CN104313208A (en) * | 2014-10-16 | 2015-01-28 | 攀枝花钢城集团有限公司 | Steelmaking slag separation method |
| CN106902957A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of method that wet magnetic separation processes molten iron pretreatment slag |
| CN108193005A (en) * | 2017-12-29 | 2018-06-22 | 吉林建龙钢铁有限责任公司 | A kind of method of desulfurization solid waste recycling |
| CN111250034A (en) * | 2020-03-24 | 2020-06-09 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN111250034B (en) * | 2020-03-24 | 2023-07-25 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN113528719A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | KR desulfurization slag disintegrating slag explosion-proof method |
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