CN105624359B - The method that a kind of utilization gas reduction vessel slag and clinker are recycled - Google Patents

The method that a kind of utilization gas reduction vessel slag and clinker are recycled Download PDF

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Publication number
CN105624359B
CN105624359B CN201511022546.8A CN201511022546A CN105624359B CN 105624359 B CN105624359 B CN 105624359B CN 201511022546 A CN201511022546 A CN 201511022546A CN 105624359 B CN105624359 B CN 105624359B
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slag
vessel
vessel slag
reduction
gas
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CN105624359A (en
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王杰
杨利彬
吴伟
梁强
何赛
刘小亮
戴诗凡
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Central Iron and Steel Research Institute
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Central Iron and Steel Research Institute
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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F27D2017/006—Systems for reclaiming waste heat using a boiler
    • 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
    • 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
    • Y02P10/25—Process efficiency
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Details (AREA)

Abstract

The present invention relates to a kind of method that utilization gas reduction vessel slag and clinker are recycled, it comprises the following steps：Converter steelmaking process is divided into pneumatic steelmaking to be heat-treated in two flows, the pneumatic steelmaking flow with vessel slag, the oxidized reaction of the impurity element in molten iron enters vessel slag in the form of the oxide, forms the hot vessel slag of high content of phosphorus；The vessel slag is poured into processing slag and fills unit, flow is heat-treated into the vessel slag, the slag filling unit for filling the vessel slag is transferred to vessel slag treating stations, the hot reduction by reducing medium of coal gas occurs for the vessel slag in the vessel slag treating stations, wherein, FeO reduction ratio ＞ 80%, P2O5Reduction ratio ＞ 80%, hot reduction treatment process carries out the waste heat recovery of the vessel slag and gaseous state phosphorus recovery operation simultaneously, and the vessel slag after processing finishes is re-applied as pre-melted slag and iron content cooling material return converter.

Description

The method that a kind of utilization gas reduction vessel slag and clinker are recycled
Technical field
It is more particularly to a kind of the invention belongs to the technical field that convertor steelmaking process solid waste resource is efficiently utilized Using the hot high content of phosphorus vessel slag of gas reduction and carry out the method that clinker is recycled.
Background technology
To meet the requirement that iron and steel enterprise produces low cost, efficient, stability to clean steel, metallargist is to steel Production procedure has carried out system, detailed parsing.According to the different metallurgy characteristics in each smelting stage, by traditional converter ' one-stop ' Steel-making mode be decomposed into molten iron pretreatment desulfurizing, converter low temperature early stage high efficiency dephosphorating, middle deslagging, converter smelting later stage few slag Some processing steps such as decarburization heating, terminal tapping, slag splashing.Seek to fill that iron and steel enterprise to clean steel produce low cost, The efficient, requirement of stability.
The refinement of converter smelting process, particularly converter " double slag process ", " duplex practice " smelting process, make converter steelmaking process The utilization degree reduction of carbon.It is mainly reflected in, converter smelting early stage is in order to meet the thermodynamics needs of dephosphorization, converter molten pool Temperature control takes the means for suppressing heating, makes the oxidation rate reduction of the carbon of early stage converting process, but result in the process CO growing amount reduction, epipodium guaranteed request it is current under the conditions of, the smelting process of fire door tiny structure sucks substantial amounts of air Converter gas, so as to reduce the recycling degree of coal gas of converter, and then result in converter steelmaking process carbon stream energy Waste.
The recycling of coal gas of converter is the important technology index of converter smelting, in order to make up CO loss, existing work It is more to concentrate on the initial grade of reduction gas recovery with changing rotation speed of fan reduction air imbibed quantity to improve that skill, which is improved, The measure of CO grades, shows that above-mentioned measure fails to solve the problem of coal-gas recovering amount is reduced very well from the data referred to, and And the calorific value of coal gas is also affected.
Steel Production Flow Chart is the flow of high consumption, is also the flow of high production.What is consumed is not only containing for high Fe content Iron material, more has some to make steel auxiliary material, such as lime, dolomite；Output is not only qualified steel, more there is a suitable ratio The solid waste of example, such as vessel slag；Resource problem is always the one big problem for limiting development of iron and steel enterprises.Traditional converter The method of recycling is predominantly used as cement raw material, roadbed raw material and sea base raw material, and these measures can solve solid substantially The problem of waste utilization, but it is still helpless the problem of consumption high to steel industry resource.
Converter steelmaking process is pyroprocess, is also " negative can " process, most directly embody be exactly low temperature molten iron with it is normal Oxidation heat liberation of the steel-making supplementary material Jing Guo smelting process under temperature becomes the molten steel of high temperature and the high temperature furnace slag of molten state, and output Coal gas of converter.This process, accounts for the release energy energy of significant proportion of chemical reaction and is converted to the sensible heat of converter slag, this part shows The utilization of heat does not obtain sufficiently high attention in current most research.
The content of the invention
In view of the above problems, the present invention is directed to propose one kind can realize that low-grade coal gas is efficiently utilized, vessel slag is returned Recycling, efficient, energy-saving and environmental protection the methods of vessel slag heat recovery, effect is utilized to solve coal gas in the prior art The problem of rate is low, vessel slag utilization rate poor and vessel slag waste heat recovery volume is low.
The method that the utilization gas reduction vessel slag and clinker of the present invention is recycled, it comprises the following steps：
Converter steelmaking process is divided into pneumatic steelmaking to be heat-treated in two flows, the pneumatic steelmaking flow with vessel slag, The oxidized reaction of impurity element in molten iron enters vessel slag in the form of the oxide, forms the hot vessel slag of high content of phosphorus；
The vessel slag is poured into processing slag and fills unit, flow is heat-treated into the vessel slag, fills the place of vessel slag Reason slag fills unit and is transferred to vessel slag treating stations, and the vessel slag occurs to be situated between by reduction of coal gas in the vessel slag treating stations The hot reduction of matter, wherein,
FeO reduction ratio ＞ 80%, P2O5Reduction ratio ＞ 80%, hot reduction treatment process carries out described simultaneously The waste heat recovery of vessel slag and gaseous state phosphorus recovery operation, the vessel slag after processing finishes are returned as pre-melted slag and iron content cooling material Converter is re-applied.
Further, the vessel slag is the terminal slag, double slag process and double-united gear oil pump technique of single slag process smelting process Dephosphorized slag and decarbonized slag；The physics percentage by weight of wherein dephosphorized slag is：Basicity of slag R=CaO/SiO2=1.0-3.0, CaO=20.0-40%, SiO2=10.0-30.0%, FeO=8.0-30.0%, MgO=5.0-10.0%, P2O5=1.5- 15.0%；The physics percentage by weight of decarbonized slag and terminal slag is：Basicity of slag R=CaO/SiO2=2.5-4.5, CaO =30.0-50%, SiO2=10.0-30.0%, FeO=8.0-30.0%, MgO=5.0-10.0%, P2O5=1.0- 15.0%；
Further, the processing slag fills to contain to fill for the vessel slag with bottom blow supplying setting fills car, the bottom with slag Blow feeder including slag fill before the air supply device of bottom, bottom blowing gas pipeline and supply control system, vessel slag treating stations with Institute's air supply source is inert gas after vessel slag treating stations, and institute's air supply source is the coal gas as reducing gas in vessel slag treating stations.
Further, the coal gas is the coal gas of converter, blast furnace gas and the coke-stove gas that are produced in steel manufacture process, institute It is 5%-80% to state CO content ranges in coal gas；
Further, the vessel slag treating stations are cavity type vessel slag reduction treatment container, described cavity type converter It is 0.0-3.0Nm that slag reduction treatment container is salable, can bear 1.0-5.0MPa middle pressure, can be passed through adjustable tolerance3/ Tmin reducing gas, clinker stirring can be carried out by mechanical arm, gas content detection can be carried out and Detoxified treatment, can be taken out Vacuum, waste heat and gaseous state phosphorus can be carried out reclaim.
Further, the Detoxified treatment be to the vessel slag treating stations be passed through air by its internal coal gas handle to Safe range.
Further, the processing slag is filled is attached with the vessel slag treating stations by the bottom blow supplying setting, Reducing gas is blown into hot vessel slag by the bottom blow supplying setting by the vessel slag treating stations air supply system.
Further, in the vessel slag treating stations processing mode of hot slag seal for treating stations → be filled with reducing gas Carry out slag reduction → treating stations exhausting → and be filled with reducing gas progress slag reduction → treating stations exhausting, terminate to circulation；Institute The pressure limit for stating vessel slag treating stations hermetically sealed can be the slag reduction time described in 0.2-5.0MPa be 0-10min；It is described " to be filled with Reducing gas carries out slag reduction → treating stations exhausting " according to the difference of processing time each time, its circulation frequency is cycle-index 1-10 times.
Further, the reducing gas that is filled with carries out stirring with mechanical arm to vessel slag while slag reduction And process waste heat is reclaimed, described waste-heat recovery device is waste heat boiler, and it is processed as low-temperature circulating water and passed through at the heat of high temperature Reason station becomes high-temperature steam, and high-temperature steam handles the heat of vessel slag handling process being changed into through waste heat boiler can reclaim profit Electric energy carries out secondary utilize.
Further, gaseous state phosphorus recovery operation is carried out during the exhausting for the treatment of stations in the vessel slag treating stations, its Way of recycling is that high-temperature gas separates out the cooling of gaseous state phosphorus and be settled down to accumulator tank by cooling section.
The present invention, which realizes the reduction of vessel slag phosphorus load and can return to pneumatic steelmaking flow, realizes recycling, not only may be used Consumed with the slag forming material for saving pneumatic steelmaking flow, the waste heat recovery for the treatment of stations can also realize the efficient of converter procedure energy Utilize, can particularly solve the carbon waste problem that low-grade coal gas is difficult to recycle, and the utilization of fritting vessel slag The slagging speed and scorification degree that pneumatic steelmaking flow journey can be made are optimized.
Other features and advantages of the present invention will be illustrated in the following description, also, the partial change from specification Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write Specifically noted structure is realized and obtained in book, claims and accompanying drawing.
Brief description of the drawings
Fig. 1 is the hot vessel slag reduction treatment flow of gas reduction；
Fig. 2 is slag reduction handling process in vessel slag treating stations；
Fig. 3 fills cell schematics for processing slag；
Fig. 4 is vessel slag treating stations schematic diagram.
Wherein, 1- slag ladles, the 2- slag cars, 3- bottom blow supplying settings, 4- gas passages, 5- closures, 6- waste heat water pipes, 7- can Lift telescopic arm, 8- stirring-heads, 9- slag ladle bases, 10- vessel slag treating stations
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and It is used for the principle for explaining the present invention together with embodiments of the present invention.
As shown in Figure 3 and Figure 4, in pneumatic steelmaking flow of the present invention, low temperature, the molten iron containing a large amount of impurity elements are through peroxidating Smelt become high temperature, clean molten steel, during this, the oxidized reaction of impurity element in molten iron enters in the form of the oxide Vessel slag；After the completion of pneumatic steelmaking stage task, the hot vessel slag of high content of phosphorus pours into processing slag and fills unit, into converter Slag is heat-treated flow, and the slag filling unit for filling hot vessel slag is transferred to vessel slag treating stations 10, hot turn in treating stations 10 Hot reduction by reducing medium of coal gas, wherein FeO reduction ratio ＞ 80%, P occur for clinker2O5Reduction ratio ＞ 80%, hot reduction treatment process carries out treating stations waste heat recovery and gaseous state phosphorus recovery operation simultaneously, handles the converter after finishing Slag returns to converter with iron content cooling material as pre-melted slag and re-applied.
As shown in figure 1, vessel slag reduction treatment flow is, converter is slagged tap and (vessel slag is poured into processing slag and fills unit) → locates Reason slag fills shipped → processing slag filling unit and moves to vessel slag treating stations → vessel slag treating stations sealing → vessel slag treating stations It is filled with reducing gas progress reduction treatment → processing to terminate, reducing gas residual volume detection → vessel slag treating stations removing toxic substances → converter The pressure emptying of Slag treatment station is soared (slag, which is filled, to be removed) with unpacking → vessel slag treating stations.
As shown in figure 3, processing slag fills unit fills 1 and the slag car 2 for the slag with bottom blow supplying setting 3；Bottom blow supplying setting 3 Air supply device (disperse formula air brick, slot-type ventilating brick or circular seam type bottom blowing gun), the bottom blowing gas pipeline of bottom are filled including slag And control system (not shown) is supplied, its source of the gas is divided into inert gas (nitrogen or argon gas) and work according to processing stage difference For the coal gas of reducing gas.The processing position that described processing stage fills according to slag is divided into before treating stations, in treating stations, treating stations Afterwards, it is inert gas with stage institute's air supply source after treating stations wherein before treating stations, to ensure that bottom-blowing air feed element is penetrating, treating stations Middle institute's air supply source is the coal gas as reducing gas, to promote slag reduction.Coal gas is the converter coal that steel production process is produced CO content ranges are 5%-80% in gas, blast furnace gas and coke-stove gas, coal gas；Described coal gas of converter divides according to source is different For " double slag process " and " duplex practice " technique dephosphorization phase low-grade coal gas, " double slag process " and " duplex practice " decarburization phase high grade coal The high-grade coal gas of gas, " single slag process " smelting process, its ratio is according to " double slag process ", " duplex practice " and " single slag process " technique application Ratio difference and change.
Vessel slag treating stations 10 are cavity type vessel slag reduction treatment container, and its is salable, can bear 1.0-5.0MPa's Middle pressure, adjustable tolerance reducing gas can be passed through, clinker stirring can be carried out by mechanical arm, gas content inspection can be carried out Survey and detoxify, vacuum-pumping, waste heat and gaseous state phosphorus can be carried out reclaim；The top of vessel slag treating stations 10 is provided with closure 5, can Realize that it is sealed, multiple waste heat water pipes 6 are provided with closure 5, and the top of closure 5 is provided with gas passage 4, vessel slag Treating stations 10 are provided with slag ladle base 9 on bottom, and slag ladle 1 is placed on slag ladle base when slag reduction processing is carried out in treating stations On, the bottom blow supplying setting 3 being connected with slag ladle 1 is through the hole on slag ladle base 9, and the interior liftable set of vessel slag treating stations is stretched Arm 7 of drawing back one's hand is located at the top of slag ladle 1, and lifting telescopic arm end is connected with stirring-head 8, and stirring-head 8 can be stirred in slag ladle 1 It is dynamic.The flow adjustment range of reducing gas is 0.0-3.0Nm wherein in vessel slag treating stations 103/t·min。
Detoxified treatment is handled treating stations coal gas to safe range to be passed through air to sealed vessel slag treating stations 10；It is logical Enter air capacity by computer according to detect gas content is calculated automatically；Processing slag fills unit and passes through bottom with vessel slag treating stations 10 Blow feeder 3 to be attached, reducing gas is blown into slag ladle 1 by bottom blow supplying setting 3 by vessel slag treating stations air supply system In interior hot vessel slag.
The percentage by weight of the physics for the vessel slag that return pneumatic steelmaking flow is re-used is after processing：Clinker alkali Spend R=1.2-4.5, CaO=20.0-50%, SiO2=10.0-30.0%, FeO=0.1-10.0%, MgO=5.0- 15.0%, P2O5=0.1-3.0%, Fe=5.0-25.0%.
Convertor steelmaking process is divided into pneumatic steelmaking and vessel slag two flows of heat treatment by the present invention, and process is with carbon Flowing.Pneumatic steelmaking flow mainly realizes the smelting task of molten steel, during which with the generation of vessel slag, coal gas of converter.Converter Slag heat treatment flow is mainly the recycling and UTILIZATION OF VESIDUAL HEAT IN of thermal slag, during which has the efficient utilization of coal gas, vessel slag phosphorus to bear The release of lotus and the recovery of vessel slag waste heat.The main task of convertor steelmaking process is the raising of CO growing amounts and yield, is subtracted The loss of few carbon, carbon element loss desired value is less than 10%；Vessel slag heat treatment flow mainly realizes the high-temperature heat treatment of clinker With the release of phosphorus load, target P2O5Reduction ratio ＞ 80%.
The present invention improves CO growing amounts and the major measure of yield is broadly divided into according to the difference of smelting process：
For conventional single slag process smelting process, the present invention improves CO growing amounts and the major measure of yield is：Improve and supply Oxygen intensity and oxygen utilization rate, reduce secondary oxidation ratio；Blower fan is adjusted according to the DECARBONIZATION REACTION RATE in converter smelting each stage Rotating speed, reduces air imbibed quantity, and the grade caused by dilution with reaction of reduction coal gas is reduced.
For " double slag process ", " duplex practice " smelting process, the present invention improves CO growing amounts and the major measure of yield is： The requirement controlled according to temperature control and DECARBONIZATION REACTION RATE, allocates the suitable rotational speed of blower fan, reduces air imbibed quantity, reduction coal gas Grade is reduced caused by dilution with reaction；Temperature control uses a certain proportion of lime stone, introduces CO2, improve process carbon Amount, and facilitate CO2CO is converted into, the utilization rate of process carbon is improved.
For conventional single slag process smelting process, it is oxygen rifle that the present invention, which improves oxygen supply intensity and the major measure of oxygen utilization rate, The optimization of pipette tips parameter.
For the change of decarburizing reaction speed, the main control software by the systemic presupposition of regulation and control of rotation speed of fan of the present invention It is automatically performed.The result of requirement and the flue gas analysis of decarburizing reaction speed reference technique, this is the program of a closed loop, according to inspection Result adjustment air-blower control is surveyed, control result feedback realizes the combination that technological requirement and technological design are optimized.
For the recycling of " double slag process ", " duplex practice " smelting process low temperature smelting phase relatively low-grade coal gas, it is The calorific value of coal gas is not reduced, the present invention individually sets up the secondary gas chamber of low temperature smelting phase.
The release of high temperature furnace slag phosphorus load of the present invention, the main reduction reaction for occurring CO, CO is mainly derived from coal gas of converter. For " double slag process ", " duplex practice " smelting process, CO is mainly derived from the gas chamber of low temperature smelting early stage, implements ' unnecessary few Mend ', the coal gas of benefit is from the original main gas chamber of enterprise.
To improve the releasing effect of melting vessel slag phosphorus load, the supply mode of coal gas of the present invention is to fill 1 bottom by slag Bottom blow supplying setting 3 be injected to the inside of slag.
To improve the releasing effect of melting vessel slag phosphorus load, converter Slag treatment Slag treatment station 10 of the present invention is used can pressure control Management.The Slag treatment stage is using pressurization (0.2-2.0MPa) processing.(the P of releasing ratio ＞ 80% of dephosphorized slag phosphorus load2O5Reduction Rate ＞ 80%).
For the security for the coal gas running for improving vessel slag treating stations, the present invention can lead to after converter Slag treatment terminates The air that default gas passage 4 sprays appropriate amount to the cavity of Slag treatment container is crossed, coal gas removing toxic substances is carried out.
To prevent from spraying influence of the air to vessel slag result, the emitted dose of air of the present invention is according to converter Slag treatment The testing result of the CO content detection devices for 10 internal presets of standing is calculated by computer and automatically controlled.
The waste heat recovery of present invention melting vessel slag is realized that corresponding device has shifted to an earlier date in the construction stage by waste heat boiler In vessel slag treating stations 10.
The vessel slag that conventional single slag process smelting process processing finishes in the present invention, can conduct according to the demand of smelting process Pre-melted slag returns to the participation steel-making of pneumatic steelmaking flow and used, and can also be processed as progress as cement raw material；For " double slags Method ", " duplex practice " smelting process, handle the high content of phosphorus dephosphorized slag that finishes and return to the converter dephosphorization phase mainly as pre-melted slag, with Optimize early stage slugging and temperature control.
For " single slag process " smelting process, converter smelting terminates, and is tapped, splashes slag, the hot converter splashed after slag terminates The slag that slag is poured into shown in Fig. 3 fills processing unit, and tapping process keeps the bottom blowing of slag filling processing unit unimpeded, end of slagging tap, slag filling Processing unit is transported to the vessel slag treating stations shown in Fig. 4, and vessel slag carries out the reduction treatment shown in Fig. 2 in treating stations, also original place Reason process is passed through the coal gas of converter that main gas chamber is reclaimed, and whole handling process is as shown in Figure 1；
For " double slag process " " duplex practice " smelting process, the processing of vessel slag is divided into dephosphorization Slag treatment and decarburization Slag treatment two Individual part.Dephosphorization residues processing technique is：Early stage, which is smelted, to be terminated to carry out dephosphorized slag discharge, and the dephosphorized slag of discharge pours into slag filling and handles single Member, tapping process keeps the bottom blowing of slag filling processing unit unimpeded, and tapping process progress dephosphorized slag foamed control, dephosphorized slag is slagged tap Terminate, slag filling processing unit is transported to the vessel slag treating stations shown in Fig. 4, vessel slag carries out the also original place shown in Fig. 2 in treating stations Reason, reduction treatment process is passed through the coal gas of converter that secondary gas chamber is reclaimed, and whole handling process is as shown in Figure 1；Decarburization Slag treatment work Skill is：Converter smelting terminates, and is tapped, splashes slag, and it is single that the slag that the hot vessel slag splashed after slag terminates is poured into shown in Fig. 3 fills processing Member, tapping process keeps the bottom blowing of slag filling processing unit unimpeded, end of slagging tap, and slag filling processing unit is transported to the converter shown in Fig. 4 Slag treatment station, vessel slag carries out the reduction treatment shown in Fig. 2 in treating stations, and reduction treatment process is passed through the converter of gas chamber recovery Coal gas, whole handling process is as shown in Figure 1.
With the gas reduction thermal slag experiment of 25kg reactors (simulation vessel slag treating stations) and 300kg induction furnace dephosphorizations The hot high content of phosphorus vessel slag of test simulation gas reduction simultaneously carries out the smelting process that clinker is recycled.
40kg dephosphorized slags are added in 300kg induction furnaces first in simulation test procedure, 1500 DEG C are warming up within about 2.0 hours, 20min is incubated, treats that dephosphorized slag is melting down, takes initial sample, CaO=32.28%, SiO2=16.66%, FeO=19.28%, MgO= 8.02%, P2O5=6.90%.
Melting down clinker is poured out afterwards, stirring is cooled to 1250-1300 DEG C (slag is splashed in simulation), weigh 20kg dephosphorized slags and put Enter reactor, the sealing of question response kettle is passed through C0 into reactor：N2=1:2.5 9m3Coal gas, handles 40min, takes middle sample, CaO=35.64%, SiO2=18.39%, FeO=2.80%, MgO=8.85%, P2O5=1.42%, Fe=14.16%, P2O5Percent reduction 81.3%, FeO percent reductions 86.2%.
Last to add the 250kg pig iron in 300kg induction furnaces, 1.2kg ferrophosphorus is warming up to 1350 DEG C, insulation for about 1.5 hours 20min, treats that molten iron is melting down, takes the initial sample of molten iron, C=4.32%, Si=0.21%, P=0.25%.The blowing of drop rifle, rifle afterwards Position 270mm, oxygen supply intensity 2.0Nm3/ tmin, bottom blowing nitrogen intensity 0.20Nm3Input lime in top after/tmin, oxygen blast 30s Block, light dolomite block each 1.5kg, fluorite 0.5kg, and add in batches after dephosphorized slag 18kg after reduction treatment, oxygen blast 500s Thermometric simultaneously take half steel sample with experiment dephosphorization slag specimen, [C]=3.15%, [P]=0.049%, T=1372 DEG C, CaO=31.20%, SiO2=17.21%, FeO=21.36%, MgO=7.96%, P2O5=5.59%, dephosphorization rate 83.32%.
The present invention is carrying out the progress treating stations waste heat recovery simultaneously of hot reduction treatment process and gaseous state phosphorus recovery operation, place Vessel slag after reason finishes is re-applied as pre-melted slag with iron content cooling material return converter.Can by above-mentioned slag treatment flow Recycling is realized to realize the reduction of vessel slag phosphorus load and pneumatic steelmaking flow can be returned, converter refining can be not only saved The slag forming material consumption of steel flow, the waste heat recovery for the treatment of stations can also realize the efficient utilization of converter procedure energy, particularly The carbon waste problem that low-grade coal gas is difficult to recycle can be solved, and the utilization of fritting vessel slag can refine converter The slagging speed of steel flow journey is optimized with scorification degree.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, It should all be included within the scope of the present invention.

Claims (6)

1. a kind of method that utilization gas reduction vessel slag and clinker are recycled, it comprises the following steps：
Converter steelmaking process is divided into pneumatic steelmaking to be heat-treated in two flows, the pneumatic steelmaking flow with vessel slag, molten iron In impurity element it is oxidized reaction in the form of the oxide enter vessel slag, formed high content of phosphorus hot vessel slag；
The vessel slag is poured into processing slag and fills unit, flow is heat-treated into the vessel slag, fills the processing slag of vessel slag Fill unit and be transferred to vessel slag treating stations, the vessel slag occurs using coal gas as reducing medium in the vessel slag treating stations Hot reduction, wherein,
FeO reduction ratio ＞ 80%, P2O5Reduction ratio ＞ 80%, hot reduction treatment process carries out the converter simultaneously The waste heat recovery of slag and gaseous state phosphorus recovery operation, the vessel slag after processing finishes expect to return to converter as pre-melted slag and iron content cooling Re-apply；
The processing slag fills unit and filled for the slag with bottom blow supplying setting and the slag car, and the bottom blow supplying setting includes slag and fills bottom With being supplied after vessel slag treating stations before air supply device, bottom blowing gas pipeline and the supply control system in portion, vessel slag treating stations Source is the coal gas that institute's air supply source is as reducing gas in inert gas, vessel slag treating stations；
The coal gas is that CO contains in the coal gas of converter, blast furnace gas and the coke-stove gas that produce in steel manufacture process, the coal gas Amount scope is 5%-80%；
The vessel slag treating stations are cavity type vessel slag reduction treatment container, described cavity type vessel slag reduction treatment container Middle pressure salable, that 1.0-5.0MPa can be born, adjustable tolerance can be passed through for 0.0-3.0Nm3/ tmin reduction coal Gas, clinker stirring can be carried out by mechanical arm, gas content detection can be carried out and Detoxified treatment, vacuum-pumping, can carry out it is remaining Heat and gaseous state phosphorus are reclaimed；
The Detoxified treatment is to be passed through air to the vessel slag treating stations to handle its internal coal gas to safe range.
2. the method that utilization gas reduction vessel slag according to claim 1 and clinker are recycled, it is characterised in that institute State the dephosphorized slag and decarbonized slag of terminal slag, double slag process and double-united gear oil pump technique that vessel slag is single slag process smelting process；Wherein The physics percentage by weight of dephosphorized slag is：Basicity of slag R=CaO/SiO2=1.0-3.0, CaO=20.0-40%, SiO2 =10.0-30.0%, FeO=8.0-30.0%, MgO=5.0-10.0%, P2O5=1.5-15.0%；Decarbonized slag and terminal slag Physics percentage by weight be：Basicity of slag R=CaO/SiO2=2.5-4.5, CaO=30.0-50%, SiO2=10.0- 30.0%, FeO=8.0-30.0%, MgO=5.0-10.0%, P2O5=1.0-15.0%.
3. the method that utilization gas reduction vessel slag according to claim 1 and clinker are recycled, it is characterised in that institute State processing slag filling unit to be attached by the bottom blow supplying setting with the vessel slag treating stations, reducing gas passes through described Bottom blow supplying setting is blown into hot vessel slag by the vessel slag treating stations air supply system.
4. the method that utilization gas reduction vessel slag according to claim 3 and clinker are recycled, it is characterised in that institute State the processing mode of hot slag in vessel slag treating stations and seal → be filled with reducing gas progress slag reduction → processing for treating stations The exhausting → be filled with of standing reducing gas carries out slag reduction → treating stations exhausting, terminates to circulation；The vessel slag treating stations sealing The pressure limit of tank be the slag reduction time described in 0.2-5.0MPa be 0-10min；It is described " to be filled with reducing gas and carry out clinker also It is 1-10 times that original → treating stations exhausting " cycle-index circulates the frequency according to different its of processing time each time.
5. the method that utilization gas reduction vessel slag according to claim 4 and clinker are recycled, it is characterised in that institute State stirring while being filled with reducing gas progress slag reduction with mechanical arm to vessel slag and process waste heat is reclaimed, it is described Waste-heat recovery device be waste heat boiler, it is processed as low-temperature circulating water and becomes high-temperature steam by the heat treatment station of high temperature, high Warm steam is handled through waste heat boiler is changed into the heat of vessel slag handling process the secondary profit of the electric energy that can be recycled progress With.
6. the method that utilization gas reduction vessel slag according to claim 5 and clinker are recycled, it is characterised in that institute State gaseous state phosphorus recovery operation in vessel slag treating stations to carry out during the exhausting for the treatment of stations, its way of recycling passes through for high-temperature gas Supercooling section makes the cooling of gaseous state phosphorus separate out and be settled down to accumulator tank.
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CN111485043A (en) * 2020-06-01 2020-08-04 上海驰春节能科技有限公司 Dephosphorization process and device for liquid steel slag
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