CN101475998B - Hot steel slag cracking method - Google Patents
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- CN101475998B CN101475998B CN2009100370224A CN200910037022A CN101475998B CN 101475998 B CN101475998 B CN 101475998B CN 2009100370224 A CN2009100370224 A CN 2009100370224A CN 200910037022 A CN200910037022 A CN 200910037022A CN 101475998 B CN101475998 B CN 101475998B
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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
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- 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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Abstract
The present invention relates to an incandescent steel slag cracking method, including: directly pouring the incandescent steel slag in a steel slag cracking furnace, spraying water for thermal stewing cracking, cooling drying discharge and steam heat energy recovery. The invention is characterized in that the incandescent steel slag from the steel plant no longer needs a dedicated storage yard for stacking cooling, namely, the incandescent steel slag can be directly poured in the steel slag cracking furnace for thermal stewing cracking; fork-lift truck and excavator are nor required in the whole process form self-loading furnace to discharging from furnace; the steel wall material of the cracking furnace has stable working conditions, and is free from man-made mechanical damages, so that its service life will be more than 5 years; sensible heat of the incandescent steel slag can be stably and efficiently recovered, and the whole process can realize PLC automated control; the system investment is approximately 50% of the existing technology, operating cost is 60% of the pot stewing technology, the metal recovery rate is improved 10% or more, water from the furnace cinder is less than 5%; a 500,000 tons/year steel slag processing line recovers steel slag residual heat equivalent to 10,000 tons of standard coal thermal value.
Description
[technical field]
The present invention relates to a kind of metallurgical slag treatment process, especially relate to a kind of hot steel slag cracking method.
[background technology]
Steelmaking process is actual to be exactly slagging process, China's crude steel production capacity has reached 600,000,000 tons/year, one ton of steel of every production can produce the 200kg slag approximately, the hot steel slag temperature of discharging from steel melting furnace is between 1300 ℃～1550 ℃ and be in a liquid state, have an appointment about 5% metallic iron of parcel not only in the red-hot slag, and the sensible heat of hot steel slag per ton is no less than the thermal value of 60kg mark coal.Produce 600000000 tons of steel per year and just mean that more than the 100000000 ton of slag of having an appointment produces, 5,000,000 tons of/year metallic irons of wherein having an appointment await reclaiming, and the thermal value of 6,000,000 tons of/year mark coals awaits utilizing.
Because iron ore deposit is day by day in short supply, the iron and steel enterprise of domestic various scales all pays much attention to the recovery of metal charge in the slag, successful Application and Development multiple slag crushing, magnetic separation, classification technique, to reclaim metal charge as much as possible, wherein use at most with the stewing technology of slag heat, prospect is the widest.The principle of the stewing technology of slag heat is that hot steel slag is placed stewing jar, in stewing jar, spray water to the slag surface atomizing, make its internal-external temperature difference excessive and produce thermal stresses, steam pressure process chats phase change and produce transformation stress etc., make slag cool off fast, broken naturally, thereby realized the better separation between metal and the slag, after multistage classification magnetic separation, metal charge and nonmetal material are separated afterwards, made it that Each answers the purpose intended.
But all even to this day stewing technology of slag heat all have a lot of defectives with equipment, mainly contain:
The one: need and will be poured into open-air after naturally cooling to middle temperature (300～800 ℃) from the red-hot slag in the steelshop slag ladle (more than 1000 ℃), pack into by forklift again and boil in a covered pot over a slow fire stewing system the in the jar, promptly can not boil in a covered pot over a slow fire the red-hot slag of system, though some technology can be boiled in a covered pot over a slow fire the preparing high-temp liquid slag, but its operation is very complicated, and production efficiency is extremely low;
The 2nd: the stewing process of slag heat is a periodical operation in stewing jar, include in the one-period that cooling is boiled in a covered pot over a slow fire, left standstill in forklift tinning, atomizing spray heat, excavator hook material goes out four processes such as jar, one-period needs about 12 hours, this must cause stewing jar quantity too much (usually more than 4), forklift and excavator turn over operation at stewing jar of narrow and small other wheel, be unfavorable for not to the utmost very much safety in production, also increased the energy consumption that takes in the material operating process;
The 3rd: the bed of material blocked up (usually more than 4 meters) in stewing jar, moment gasification and overflow stewing jar when water is sprayed onto hot steel slag surperficial from bed of material top, have only after the skin temperature landing, water just can successively be penetrated into material layer lower part, and there is the dead angle in stewing jar, cause the stewing time of heat oversize, the slag stewing homogeneity is very poor;
The 4th: stewing pot bottom catchments easily, as easy as rolling off a log blasting when packing hot steel slag into and cause loss of life and personal injury or property damage damaged under the effect of jar end tank wall material unavoidable multiple factors such as mechanical collision in colding and heat succeed each other, take on the material process simultaneously continually;
The 5th: the waste heat of hot steel slag can't be recycled, and scatters and disappears in atmospheric environment with steam;
The 6th:, charging many owing to stewing jar of quantity need forklift, discharging need excavator, stewing jar life-span short cause system invest excessive, working cost is high, potential safety hazard is many.
[summary of the invention]
In order to overcome the above-mentioned defective of prior art, the invention provides a kind of hot steel slag cracking method, the present invention can will directly pour in the steel slag cracking stove from the hot steel slag in the steelshop slag ladle, in the steel slag cracking stove, successively finish cold, the hot stewing cracking of spraying of red-hot slag speed, whole process such as self-emptying behind the cooling drying can constantly produce high-temperature steam simultaneously, realize the recycling of slag waste heat through heat exchanger again.
The technical solution adopted for the present invention to solve the technical problems is: a kind of hot steel slag cracking method, comprise hot steel slag is poured directly into steel slag cracking stove, the stewing cracking of spraying heat, and self-emptying and steam thermal energy reclaim behind the cooling drying, and its processing step is:
A, at first open steel slag cracking furnace bottom drawing mechanism, make charge level decline 1～2m in the stove, highly decide on the slag ladle size, open steel slag cracking stove charging door then, the slag ladle that will hot steel slag be housed from steelshop turns over tank arrangement by overhead traveling crane or automobile or train or other, hot steel slag in the slag ladle is directly poured in the steel slag cracking stove by steel slag cracking stove charging door lentamente, closed steel slag cracking stove charging door;
B, open the steel slag cracking stove and respectively organize the atomizer adjusting control valve, by several shower nozzles under the air guide beam that is positioned at steel slag cracking stove middle part, from up to down be chilled to charge level water spray below 800 ℃ to steam speed equably, the steam that produces then passes the hot steel slag layer of newly packing into from bottom to up forces steam speed cold to it, hot steel slag layer temperature drops to below 800 ℃ by 1000 ℃ rapidly, vapor temperature then is enhanced more than 300 ℃, outside stove, behind certain hour (determining), repeat the step of A by the bleed device of being located at steel slag cracking furnace roof portion according to the steel melting furnace deslagging cycle;
C, in periodically taking on the material process, hot steel slag from top to bottom successively passes through steam speed cold belt, spraying cracking band, cooling drying band in the steel slag cracking stove, hot steel slag moves under the effect of himself gravity from top to bottom, meanwhile slag is by the progressively stewing cracking of heat, its temperature is then progressively by dropping to more than 1000 ℃ below 80 ℃, slag behind the cooling drying is drawn off automatically by the furnace bottom drawing mechanism, delivers to slag size classification system automatically through lifting transportation equipments such as chain mat machine, conveyors;
The steam of D, temperature more than 300 ℃, stability of flow constantly goes out from the steel slag cracking fire grate, and it is carried out waste heat recovery by importing the steam thermal energy recovery system.
Steel slag cracking stove in the described steps A from top to bottom is divided into steam speed cold belt, spraying cracking band, cooling drying band; The steel slag cracking stove is by top loading, middle part spraying, bottom discharge; The steel slag cracking stove can be one or the use in groups of some seats, arbitrary stove can carry out separately or with other stove simultaneously automatically continuously in the group, single stove is adorned the load size at every turn and takes on the material cycle identical with the steel melting furnace deslagging cycle or close, and single seat steel slag cracking furnace volume size is determined according to the size of steel melting furnace.
Among the described step B, by several shower nozzles under the air guide beam that is positioned at steel slag cracking stove middle part, by from up to down being chilled to charge level water spray below 800 ℃ to speed, the steam of generation then passes the hot steel slag layer of newly packing into from bottom to up forces steam speed cold to it.
Among the described step C, the hot steel slag that is positioned at steam speed cold belt moves down under action of gravity, quilt is from spraying cracking band in the moving process, the Low Temperature Steam speed of cooling drying band is cold, enter spraying cracking band after temperature is reduced to below 800 ℃ and carry out the stewing cracking of steam heat, slag after the cracking enters the cooling drying band, be subjected to himself waste heat at cooling drying band slag and be dried, its temperature is reduced to 80 ℃, it is below 5% that moisture content is reduced to mass percentage content, automatically draw off by the furnace bottom drawing mechanism, through chain mat machine, lifting transportation equipments such as conveyor are delivered to steel scoria magnetic separation classification operation automatically.
Among the described step D, the steam of temperature more than 300 ℃, stability of flow constantly goes out from the steel slag cracking fire grate, it is imported steam thermal energy recovery system carry out waste heat recovery; The steam thermal energy recovery system can be to utilize heat exchanger that freezing air is heated, after air is heated to about 200 ℃, as in the hot blast introducing dryer small grain size slag being dried; Also can be directly to utilize steam-electric power; Also can be to utilize steam heating; Also can be utilize steam indirectly or directly to other material dry, system such as steam-cured, heating or insulation.
The invention has the beneficial effects as follows: the hot steel slag from steelshop no longer needs dedicated storage yard to stack cooling, can directly pour into and carry out the stewing cracking of heat in the steel slag cracking stove; Do not need forklift and excavator from shove charge to the whole process of coming out of the stove; Owing to the generation of can not ponding in the steel slag cracking stove having stopped explosion hazard; Steel slag cracking stove furnace wall material work conditional stability, be not subjected to artificial physical damage, so can reach its work-ing life more than 5 years; The sensible heat of can stability and high efficiency ground recycling hot steel slag, whole process can be realized PLC automatization control.
System of the present invention investment is about 50% of prior art, and working cost is about 60% of stewing jar technology, improves metal recovery rate more than 10%, and the pulp water part of coming out of the stove is lower than 5%; Article one, 500,000 tons of/year slags are handled line, and the slag waste heat of year recovery is equivalent to the thermal values of 10000 tons of mark coals.
[description of drawings]
Fig. 1 is the technological process block-diagram among the present invention;
Fig. 2 is steel slag cracking and the energy recovery process principle figure among the present invention.
Among the figure: 1-drawing mechanism, 2-atomizer, 3-air guide beam, 4-adjusting control valve, the 5-charging door, 6-bleed device, 7-variable valve, 8-is incubated vapour pipe, and 9-insulation steam gathers pipe, 10-slag screening plant, the 11-water pump, 12-variable valve, 13-water pipe, the 14-interchanger, the 15-induced draft fan, 16-promotes transportation equipment, 17-heat preservation hot airduct, 18-dryer, 19-fly-ash separator.
[embodiment]
The invention will be further described below in conjunction with accompanying drawing:
Referring to Fig. 1 and Fig. 2, a kind of hot steel slag cracking method, when the slag ladle that hot steel slag is housed that is shipped by steelshop arrives, at first open I# steel slag cracking furnace discharge device 1, make charge level decline 1～2m in the stove, the material that goes out the slag pyrolyzer is sent into and is carried out size classification in the slag screening plant 10 through promoting transportation equipment 16, open I# steel slag cracking stove charging door 5 then, turn over tank arrangement by overhead traveling crane or automobile or train or other hot steel slag is poured in the steel slag cracking stove, batch turning finishes and closes charging door 5.
Open I# steel slag cracking stove adjusting control valve 4, make water in the condensate return pond through pump 11, variable valve 12, water pipe 13, adjusting control valve 4, atomizer 2, from top to bottom be chilled to charge level water spray below 800 ℃ below the air guide beam 3 to speed from steam speed cold belt, water smoke and temperature are that 500 ℃～800 ℃ middle temperature slag meets and evaporation rapidly, the steam ground warp air guide from bottom to top beam 3 that temperature is about 150 ℃, passing the spraying cracking takes to and reaches the hot steel slag layer of newly packing into and force steam speed cold to it, hot steel slag layer temperature is rapidly by dropping to more than 1000 ℃ below 800 ℃, vapor temperature has then been brought up to more than 300 ℃ by 150 ℃, by bleed device 6 through variable valve 7, insulation vapour pipe 8, insulation steam gathers pipe 9 to interchanger 14, steam is by chilled air cools in interchanger 14, partly Low Temperature Steam enters atmosphere through induced draft fan 15, flows into condensate return pond recycle after partly steam is condensed; Freezing air is heated to more than 200 ℃ through heat preservation hot airduct 17, enters dryer 18, and low temperature waste gas enters atmosphere through fly-ash separator 19, induced draft fan 20; And from the granularity≤30mm's of steel scoria magnetic separation hierarchy system, moisture about 5% small-particle slag, owing to itself temperature is dried to after moisture content is below 2% in the warm air beating that about 50 ℃, by temperature is 200 ℃, send into dry magnetic separation powder enrichment system by promoting transportation equipment.
When having the new slag ladle that hot steel slag is housed to arrive again, then open II# steel slag cracking furnace discharge device, make charge level decline 1～2m in the stove, the material that goes out the slag pyrolyzer is sent into and is carried out size classification in the slag screening plant 10 through promoting transportation equipment 16, open II# steel slag cracking stove charging door then, turning over tank arrangement by overhead traveling crane or automobile or train or other pours hot steel slag in the steel slag cracking stove into, batch turning finishes and closes II# steel slag cracking stove charging door, all the other schedule of operation are identical with I# steel slag cracking stove, the two stoves hot steel slag of packing in turn, promptly slag is that shove charge is to guarantee to enter the vapor temperature of steam thermal energy recovery system, flow is uniform and stable, and carries out the control of vapor pressure in the stove and the quantity of steam of coming out of the stove with 7 pairs of each stoves of two stoves variable valve separately.The switching cycle of two stoves can be identical with the steel melting furnace deslagging cycle, also can switch the new hot steel slag of promptly packing into when vapor temperature is lower than 300 ℃, but two stove dischargings simultaneously according to vapor temperature.
Claims (4)
1. a hot steel slag cracking method is characterized in that: comprise and directly pour hot steel slag into steel slag cracking stove, the stewing cracking of spraying heat, cooling drying discharging and steam thermal energy recovery; Its processing step is:
A, at first open steel slag cracking furnace bottom drawing mechanism, make charge level decline 1～2m in the stove, falling head is decided on the slag ladle size, open steel slag cracking stove charging door then, to by turning over tank arrangement the hot steel slag in the slag ladle directly be poured in the steel slag cracking stove by steel slag cracking stove charging door lentamente from the slag ladle that steelshop is equipped with hot steel slag, close steel slag cracking stove charging door;
B, open the steel slag cracking stove and respectively organize the atomizer adjusting control valve, by several shower nozzles under the air guide beam that is positioned at steel slag cracking stove middle part, from up to down be chilled to charge level water spray below 800 ℃ to steam speed equably, the steam that produces then passes the hot steel slag layer of newly packing into from bottom to up forces steam speed cold to it, hot steel slag layer temperature drops to below 800 ℃ by 1000 ℃ rapidly, vapor temperature then is enhanced more than 300 ℃, by the bleed device bleed of being located at steel slag cracking furnace roof portion outside stove, behind definite certain hour, repeat the A step according to the steel melting furnace deslagging cycle;
C, in periodic dress, discharging process, hot steel slag in the steel slag cracking stove from top to bottom successively by steam speed cold belt, spraying cracking band, cooling drying band; Hot steel slag moves under the effect of himself gravity from top to bottom, meanwhile slag is by the progressively stewing cracking of heat, its temperature is then progressively by dropping to more than 1000 ℃ below 80 ℃, slag behind the cooling drying is drawn off automatically by the furnace bottom drawing mechanism, delivers to slag size classification system automatically through chain mat machine or conveyor;
The steam of D, temperature more than 300 ℃, stability of flow constantly goes out from the steel slag cracking fire grate, it is imported steam thermal energy recovery system carry out waste heat recovery.
2. hot steel slag cracking method as claimed in claim 1 is characterized in that: the steel slag cracking stove in the described steps A from top to bottom is divided into steam speed cold belt, spraying cracking band, cooling drying band; The steel slag cracking stove is taked the mode of operation of top loading, middle part spraying, bottom discharge; The steel slag cracking stove is one or the use in groups of some seats, arbitrary stove can carry out separately or with other stove simultaneously automatically continuously in the group, the charging of single stove is identical with the steel melting furnace deslagging cycle with the discharging cycle or close, and single seat steel slag cracking furnace volume size is determined according to the size of steel melting furnace.
3. hot steel slag cracking method as claimed in claim 1, it is characterized in that: among the described step C, the hot steel slag that is positioned at steam speed cold belt moves down under action of gravity, quilt is from spraying cracking band in the moving process, the Low Temperature Steam speed of cooling drying band is cold, enter spraying cracking band after temperature is reduced to below 800 ℃ and carry out the stewing cracking of steam heat, slag after the cracking enters the cooling drying band, be subjected to himself waste heat at cooling drying band slag and be dried, its temperature is reduced to 80 ℃, it is below 5% that moisture content is reduced to mass percentage content, automatically draw off by the furnace bottom drawing mechanism, deliver to slag size classification system automatically through chain mat machine or conveyor.
4. hot steel slag cracking method as claimed in claim 1 is characterized in that: among the described step D, the steam of temperature more than 300 ℃, stability of flow constantly goes out from the steel slag cracking fire grate, it is imported steam thermal energy recovery system carry out waste heat recovery; The steam thermal energy recovery system is to utilize heat exchanger that freezing air is heated, after air is heated to about 200 ℃, as in the hot blast introducing dryer small grain size slag being dried; Or directly utilize steam-electric power; Or utilize steam heating; Or utilize steam indirectly or directly to other material dry, steam-cured, heating or insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100370224A CN101475998B (en) | 2009-01-23 | 2009-01-23 | Hot steel slag cracking method |
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| CN2009100370224A CN101475998B (en) | 2009-01-23 | 2009-01-23 | Hot steel slag cracking method |
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| CN101475998A CN101475998A (en) | 2009-07-08 |
| CN101475998B true CN101475998B (en) | 2010-10-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978305B (en) * | 2012-12-15 | 2014-12-17 | 武钢集团昆明钢铁股份有限公司 | Molten steel casting residue treatment and recycling method |
| CN105270991A (en) * | 2014-06-05 | 2016-01-27 | 中冶宝钢技术服务有限公司 | Steelmaking plant large molten iron slag lightering method |
| CN104372118B (en) * | 2014-10-23 | 2016-08-24 | 江苏永钢集团有限公司 | Spraying type steel slag hot is stewing covers explosion-proof equipment for steam treatment |
| CN106435067B (en) * | 2016-12-15 | 2018-06-29 | 大冶市环宇钙业科技有限公司 | A kind of energy-efficient stable type steel slag cracking furnace |
| 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 |
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Application publication date: 20090708 Assignee: SHAOGUAN QUJIANG SHENGDA METALLURGICAL SLAG ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO., LTD. Assignor: Guo Xinling Contract record no.: 2013440000411 Denomination of invention: Hot steel slag cracking method Granted publication date: 20101006 License type: Exclusive License Record date: 20130815 |
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