CN105624359A - Method for reducing converter slag by utilizing coal gas and recycling furnace slag - Google Patents

Method for reducing converter slag by utilizing coal gas and recycling furnace slag Download PDF

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Publication number
CN105624359A
CN105624359A CN201511022546.8A CN201511022546A CN105624359A CN 105624359 A CN105624359 A CN 105624359A CN 201511022546 A CN201511022546 A CN 201511022546A CN 105624359 A CN105624359 A CN 105624359A
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China
Prior art keywords
slag
converter
converter slag
gas
reduction
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CN201511022546.8A
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CN105624359B (en
Inventor
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

Abstract

The invention relates to a method for reducing converter slag by utilizing coal gas and recycling furnace slag. The method comprises the following steps: dividing a converter smelting process into a converter steelmaking process and a converter slag thermal treatment process, wherein in the converter steelmaking process, impurity elements in molten iron enter the converter slag in the form of oxides by virtue of oxidization reaction, thereby forming thermal-state converter slag with high phosphor content; pouring the converter slag into a treated slag filling unit, carrying out the converter slag thermal treatment process, transferring the slag filling unit with the converter slag to a converter slag treatment station, enabling the converter slag to generate thermal-state reduction taking the coal gas as a reducing medium in the converter slag treatment station, wherein a reducing proportion of FeO is greater than 80%, and a reducing proportion of P2O5 is greater than 80%; and while carrying out the thermal-state reduction treatment process, recycling waste heat of the converter slag and recycling gaseous-state phosphor, and taking the treated converter slag as pre-melting slag, and returning the pre-melting slag and an iron-containing cooling material into a converter for reapplication.

Description

A kind of utilize gas reduction converter slag and the method for slag recycle
Technical field
The invention belongs to the technical field that convertor steelmaking process solid waste resource efficiently utilizes, particularly relate to and a kind of utilize the hot high phosphorus content converter slag of gas reduction and carry out the method for slag recycle.
Background technology
For meeting iron and steel enterprise to the requirement of Clean Steel production low cost, high efficiency, stability, Steel Production Flow Chart has been carried out system, detailed parsing by metallurgical worker. Different metallurgy characteristics according to each smelting stage, are decomposed into some processing steps such as molten iron pretreatment desulfurizing, converter low temperature high efficiency dephosphorating in early stage, intermediate row slag, converter smelting later stage few slag decarburization intensification, terminal tapping, slag splashing by the steel-making mode of tradition converter ' one-stop '. It is intended to meet iron and steel enterprise to the requirement of Clean Steel production low cost, high efficiency, stability.
The refinement of converter smelting process, particularly converter " double slag process ", " duplex practice " smelting technology, make the utilization degree of converter steelmaking process carbon element reduce. It is mainly reflected in, converter smelting is in earlier stage in order to meet the thermodynamics needs of dephosphorization, the control of converter molten pool temperature takes the means suppressing to heat up, the oxidation rate of the carbon of converting process in early stage is reduced, but result in the growing amount of this process CO to reduce, under the current condition of high environmental requirement, the smelting technology of fire door tiny structure makes a large amount of air intake converter gas, thus reduce the recycling degree of coal gas of converter, and then result in the waste of converter steelmaking process carbon element stream energy.
The recycling of coal gas of converter is the important technology index of converter smelting, in order to make up the loss of CO, existing process modification is more that rotation speed of fan reduces air imbibed quantity to improve the measure of CO grade to the initial grade concentrating on and reducing gas recovery with changing, from the data of reference showing the problem that above-mentioned measure all could not solve coal-gas recovering amount very well and reduce, and the calorific value of coal gas is also affected.
Steel Production Flow Chart is the flow process of high flow rate, is also the flow process of high production. The ferrous material being not only high Fe content consumed, more has some steel-making auxiliary material, such as lime, rhombspars etc.; Output be not only qualified steel, more have the solid waste of significant proportion, such as converter slag; Resource problem is a big problem of restriction development of iron and steel enterprises always. The method of tradition converter recycling is mainly as cement raw material, roadbed raw material and sea base raw material, and these measures can solve the problem that solid waste utilizes substantially, but the problem of steel industry resource high flow rate is still helpless.
Converter steelmaking process is pyroprocess, is also " negative can " process, and the most directly embodying is exactly that steel-making supplementary material under the molten iron of low temperature and normal temperature becomes the molten steel of high temperature and the high temperature furnace slag of molten state through the oxidation heat liberation of smelting process, and output coal gas of converter. This process, the energy transformation accounting for chemical reaction release energy equivalence ratio is the aobvious heat of converter slag, and utilizing of this part aobvious heat does not obtain sufficiently high attention in the research of major part at present.
Summary of the invention
In view of the above problems, the present invention is intended to propose a kind of can to realize that low-grade coal gas efficiently utilizes, converter slag returns recycling, the method for efficient, the energy-saving and environmental protection of converter slag heat recovery, the problem that gas utilize efficiency in prior art is low to solve, converter slag utilization ratio poor and converter slag waste heat recovery volume is low.
The present invention utilizes gas reduction converter slag and the method for slag recycle, and it comprises the following steps:
Converter steelmaking process is divided into converter steelmaking and converter slag thermal treatment two flow processs, and in described converter steelmaking flow process, the impurity element in molten iron enters converter slag in the form of the oxide through oxidizing reaction, forms the hot converter slag of high phosphorus content;
Described converter slag is poured into process slag and fills with unit, entering described converter slag thermal treatment flow process, the process slag filling unit filling converter slag transfers to converter slag treatment station, and in described converter slag treatment station, the generation of described converter slag take coal gas as the hot reduction of reducing medium, wherein
The reduction ratio > 80% of FeO, P2O5Reduction ratio > 80%, hot reduction treatment process carries out waste heat recovery and the gaseous state phosphorus recovery work of described converter slag simultaneously, process finish after converter slag return converter as pre-melted slag and iron content cooling material and again apply.
Further, described converter slag is dephosphorized slag and the decarbonized slag of the terminal slag of single slag process smelting technology, double slag process and double-united gear oil pump technique; Wherein the physics weight percent 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%; The physics weight percent 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, described process slag is filled with and is filled with car for filling with the converter slag splendid attire of bottom blow supplying setting with slag, described bottom blow supplying setting comprises the gas supply element bottom slag filling, bottom blowing gas pipeline and air feed Controlling System, before converter slag treatment station with converter slag treatment station after institute's air supply source be rare gas element, in converter slag treatment station, institute's air supply source is the coal gas as reducing gas.
Further, described coal gas is the coal gas of converter, blast furnace gas and the coke-oven gas that produce in steel manufacture process, and in described coal gas, CO content range is 5%-80%;
Further, described converter slag treatment station is cavity type converter slag reduction treatment container, and described cavity type converter slag reduction treatment container is salable, the middle pressure that can bear 1.0-5.0MPa, can to lead to into adjustable tolerance be 0.0-3.0Nm3The reducing gas of/t min, carry out slag stirring by machinery arm, gas content can be carried out detection Detoxified treatment, vacuum-pumping, waste heat can be carried out and gaseous state phosphorus reclaims.
Further, described Detoxified treatment is lead to described converter slag treatment station to process the coal gas of its inside to safety range into air.
Further, described process slag is filled with and is connected by described bottom blow supplying setting with described converter slag treatment station, and reducing gas is blown in hot converter slag by described converter slag treatment station airing system by described bottom blow supplying setting.
Further, in described converter slag treatment station, the processing mode of hot slag is that treatment station seals �� is filled with reducing gas and carries out slag reduction �� treatment station exhausting �� be filled with reducing gas and carry out slag reduction �� treatment station exhausting, to loop ends; The pressure range of described converter slag treatment station sealed can is the slag recovery time described in 0.2-5.0MPa is 0-10min; Described " be filled with reducing gas and carry out slag reduction �� treatment station exhausting " cycle index is 1-10 time according to its circulation frequency of the difference in treatment time each time.
Further, the stirring of converter slag and process waste heat are reclaimed while reducing gas carries out slag reduction by described being filled with machinery arm, described waste-heat recovery device is waste heat boiler, it is treated to low-temperature circulating water through the heat treatment station of high temperature and becomes high-temperature steam, and the heat energy of converter slag treatment scheme is that the electric energy that can recycle carries out second stage employ through waste heat boiler process by high-temperature steam.
Further, in described converter slag treatment station, gaseous state phosphorus reclaims and is operated in the exhausting process for the treatment of station and carries out, and to be high-temperature gas make the cooling of gaseous state phosphorus precipitate out and be settled down to accumulator tank through cooling section to its way of recycling.
The present invention realizes the reduction of converter slag phosphorus load and can return converter steelmaking flow process and realize recycling, it is possible not only to the slag forming material consumption saving converter steelmaking flow process, the waste heat recovery for the treatment of station can also realize the efficient utilization of converter procedure energy, particularly can solve the carbon element waste problem that low-grade coal gas is difficult to recycle, and the utilization of fritting converter slag can make the slagging speed of converter steelmaking flow process journey and scorification degree be optimized.
Other features and advantages of the present invention will be set forth in the following description, and, becoming apparent from specification sheets of part, or understand by implementing the present invention. The object of the present invention and other advantages realize by structure specifically noted in the specification sheets write, claim book and accompanying drawing and obtain.
Accompanying drawing explanation
Fig. 1 is the hot converter slag reduction treatment flow process of gas reduction;
Fig. 2 is slag reduction treatment flow process in converter slag treatment station;
Fig. 3 is process slag filling cell schematics;
Fig. 4 is converter slag treatment station schematic diagram.
Wherein, 1-slag ladle, the 2-slag car, 3-bottom blow supplying setting, 4-gas passage, 5-sealing cover, 6-waste heat water pipe, 7-lifting telescopic arm, 8-stirring-head, 9-slag ladle base, 10-converter slag treatment station
Embodiment
Specifically describing the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing forms the application's part, and together with embodiments of the present invention for explaining the principle of the present invention.
As shown in Figure 3 and Figure 4, in converter steelmaking flow process of the present invention, low temperature, smelting through peroxidation containing the molten iron of a large amount of impurity element and become high temperature, clean molten steel, in this process, the impurity element in molten iron enters converter slag in the form of the oxide through oxidizing reaction; After the interim task of converter steelmaking completes, the hot converter slag of high phosphorus content is poured process slag into and is filled with unit, enter converter slag thermal treatment flow process, the slag filling unit filling hot converter slag transfers to converter slag treatment station 10, in treatment station 10, the generation of hot converter slag take coal gas as the hot reduction of reducing medium, wherein reduction ratio > 80%, the P of FeO2O5Reduction ratio > 80%, hot reduction treatment process carries out treatment station waste heat recovery and gaseous state phosphorus recovery work simultaneously, process finish after converter slag return converter as pre-melted slag and iron content cooling material and again apply.
As shown in Figure 1, converter slag reduction treatment flow process is, converter slags tap (poured into by converter slag process slag fill with unit) �� and process slag fills with shipped �� process slag and fills with unit and move and be filled with reducing gas to converter slag treatment station �� converter slag treatment station sealing �� converter slag treatment station and carry out reduction treatment �� process and terminate, reducing gas residual volume detection �� converter slag treatment station removing toxic substances �� converter slag treatment station pressure emptying soar with unpacking �� converter slag treatment station (slag filling moves out).
As shown in Figure 3, processing slag filling unit is fill with 1 and the slag car 2 with the slag of bottom blow supplying setting 3; Bottom blow supplying setting 3 comprises gas supply element (diffuse type gas permeable brick, slot-type ventilating brick or circular seam type bottom blowing gun), bottom blowing gas pipeline and the air feed Controlling System (not shown) that slag fills with bottom, its gas source according to treatment stage difference be divided into rare gas element (nitrogen or argon gas) and the coal gas as reducing gas. Before the process position filled with according to slag treatment stage of described is divided into treatment station, in treatment station, after treatment station, wherein treatment station is front is rare gas element with treatment station latter stage institute air supply source, to ensure that bottom-blowing air feed element is penetrating, in treatment station, institute's air supply source is the coal gas as reducing gas, to promote that slag reduces. Coal gas is coal gas of converter, blast furnace gas and the coke-oven gas that Iron and Steel Production operation produces, and in coal gas, CO content range is 5%-80%; Described coal gas of converter according to source difference be divided into " double slag process " and " duplex practice " technique dephosphorization phase low-grade coal gas, " double slag process " with " duplex practice " and the higher-grade coal gas of decarburization phase higher-grade coal gas, " single slag process " smelting technology, its ratio according to " double slag process ", " duplex practice " and the different of " single slag process " process application ratio and change.
Converter slag treatment station 10 is cavity type converter slag reduction treatment container, and it is salable, the middle pressure that can bear 1.0-5.0MPa, can lead to into adjustable tolerance reducing gas, carry out slag stirring by machinery arm, can carry out gas content detection and detoxify, vacuum-pumping, can carry out waste heat and gaseous state phosphorus reclaims, converter slag treatment station 10 top is provided with sealing cover 5, its sealing can be realized, sealing cover 5 is provided with multiple waste heat water pipe 6, and the top of sealing cover 5 is provided with gas passage 4, slag ladle base 9 it is provided with on bottom converter slag treatment station 10, when carrying out slag reduction treatment in treatment station, slag ladle 1 is placed on slag ladle base, the hole of the bottom blow supplying setting 3 being connected with slag ladle 1 on slag ladle base 9, the lifting telescopic arm 7 arranged in converter slag treatment station is positioned at the top of slag ladle 1, lifting telescopic arm end is connected with stirring-head 8, stirring-head 8 can stir in slag ladle 1. wherein in converter slag treatment station 10, the flow adjustment range of reducing gas is 0.0-3.0Nm3/t��min��
Detoxified treatment is lead to the converter slag treatment station 10 sealed to process treatment station coal gas to safety range into air; Lead to into air capacity by computer according to detect gas content calculates automatically; Process slag is filled with unit and is connected by bottom blow supplying setting 3 with converter slag treatment station 10, and reducing gas is blown in the hot converter slag in slag ladle 1 by converter slag treatment station airing system by bottom blow supplying setting 3.
The weight percent of the physics returning the converter slag that converter steelmaking flow process re-uses after process is: basicity of slag 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 converter steelmaking and converter slag thermal treatment two flow processs by the present invention, and process is all with the flowing of carbon element. Converter steelmaking flow process mainly realizes the smelting task of molten steel, and period is with the generation of converter slag, coal gas of converter. Converter slag thermal treatment flow process is mainly resource utilization and the UTILIZATION OF VESIDUAL HEAT IN of thermal slag, and there is the recovery of the efficient utilization of coal gas, the release of converter slag phosphorus load and converter slag waste heat period. The main task of convertor steelmaking process is the raising of CO growing amount and yield, reduces the loss of carbon element, and carbon element loss target value is lower than 10%; Converter slag thermal treatment flow process mainly realizes the high-temperature heat treatment of slag and the release of phosphorus load, target P2O5Reduction ratio > 80%.
The present invention improves CO growing amount and is mainly divided into according to the different of smelting technology from the major measure of yield:
For conventional single slag process smelting technology, the present invention improves the major measure of CO growing amount and yield and is: improve oxygen supply intensity and oxygen utilization rate, reduces secondary oxidation ratio; DECARBONIZATION REACTION RATE according to converter smelting each stage regulates rotation speed of fan, reduces air imbibed quantity, and the grade caused with reaction because diluting reducing coal gas reduces.
For " double slag process ", " duplex practice " smelting technology, the present invention improves the major measure of CO growing amount and yield: according to the requirement of temperature control and DECARBONIZATION REACTION RATE control, the suitable rotational speed of allotment blower fan, reducing air imbibed quantity, the grade caused with reaction because diluting reducing coal gas reduces; Temperature control adopts a certain proportion of Wingdale, introduces CO2, it is to increase process carbon element amount, and facilitate CO2It is converted into CO, it is to increase the utilization ratio of process carbon element.
For conventional single slag process smelting technology, the present invention improves the optimization that the major measure of oxygen supply intensity and oxygen utilization rate is oxygen rifle rifle head parameter.
For the change of decarburizing reaction speed, the regulation and control of rotation speed of fan of the present invention complete automatically primarily of the control software design of this systemic presupposition. The requirement of decarburizing reaction speed reference technique and the result of flue gas analysis, this is the program of a closed loop, adjusts air-blower control according to detected result, control result feedback, it is achieved the combination of processing requirement and technological design optimization.
For the recycling of " double slag process ", " duplex practice " smelting technology low temperature smelting phase relatively low-grade coal gas, in order to not reduce the calorific value of coal gas, the present invention sets up separately 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 that CO occurs, CO is mainly derived from coal gas of converter. For " double slag process ", " duplex practice " smelting technology, CO is mainly derived from the gas chamber in low temperature smelting early stage, implements ' unnecessary few benefit ', and the coal gas of benefit derives from the original main gas chamber of enterprise.
For improving the releasing effect of melting converter slag phosphorus load, the supply mode of coal gas of the present invention is fill with, by slag, the inside that the bottom blow supplying setting 3 bottom 1 is injected to slag.
For improving the releasing effect of melting converter slag phosphorus load, converter slag of the present invention process Slag treatment station 10 adopts controllable pressure to manage. The Slag treatment stage adopts pressurization (0.2-2.0MPa) process. The releasing ratio > 80% (P of dephosphorized slag phosphorus load2O5Reduction ratio > 80%).
For improving the security of the coal gas operational process of converter slag treatment station, the present invention by the air of default gas passage 4 to the cavity injection appropriate amount of Slag treatment container, can carry out coal gas removing toxic substances after converter slag process terminates.
For preventing injection air on the impact of converter slag result, the emitted dose of air of the present invention is controlled by computer calculate automatically according to the detected result of the CO content detection device of converter slag treatment station 10 internal preset.
The waste heat recovery of melting converter slag of the present invention is realized by waste heat boiler, and corresponding device was arranged in converter slag treatment station 10 in advance in the construction stage.
In the present invention, conventional single slag process smelting technology processes the converter slag finished, and can return converter steelmaking flow process as pre-melted slag according to the demand of smelting technology and participate in steel-making use, it is also possible to process as cement raw material as carrying out; For " double slag process ", " duplex practice " smelting technology, the high phosphorus content dephosphorized slag that finishes of process returns the converter dephosphorization phase mainly as pre-melted slag, to optimize early stageization slag and temperature control.
For " single slag process " smelting technology, converter smelting terminates, carry out tapping, spattering slag, spatter slag terminate after hot converter slag pour slag shown in Fig. 3 into and fill with processing unit, it is unimpeded that tapping process keeps slag to fill with the bottom blowing of processing unit, end of slagging tap, slag is filled with processing unit and is transported to the converter slag treatment station shown in Fig. 4, converter slag carries out the reduction treatment shown in Fig. 2 at treatment station, and reduction treatment process leads to the coal gas of converter become owner of gas chamber and reclaim, and whole treatment scheme is as shown in Figure 1;
For " double slag process " " duplex practice " smelting technology, the process of converter slag is divided into dephosphorized slag process to process two parts with decarbonized slag. Dephosphorized slag treatment process is: smelts end early stage and carries out dephosphorized slag discharge, the dephosphorized slag discharged is poured slag into and is filled with processing unit, tapping process keeps the bottom blowing of slag filling processing unit unimpeded, tapping process carries out dephosphorized slag foamed control, dephosphorized slag is slagged tap end, and slag is filled with processing unit and is transported to the converter slag treatment station shown in Fig. 4, and converter slag carries out the reduction treatment shown in Fig. 2 at treatment station, reduction treatment process leads to the coal gas of converter reclaimed into secondary gas chamber, and whole treatment scheme is as shown in Figure 1; Decarbonized slag treatment process is: converter smelting terminates, carry out tapping, spattering slag, spatter slag terminate after hot converter slag pour slag shown in Fig. 3 into and fill with processing unit, tapping process keeps the bottom blowing of slag filling processing unit unimpeded, slagging tap end, slag is filled with processing unit and is transported to the converter slag treatment station shown in Fig. 4, and converter slag carries out the reduction treatment shown in Fig. 2 at treatment station, reduction treatment process leads to the coal gas of converter reclaimed into gas chamber, and whole treatment scheme is as shown in Figure 1.
Simulate the hot high phosphorus content converter slag of gas reduction with the gas reduction thermal slag test of 25kg reactor (simulation converter slag treatment station) and 300kg induction furnace dephosphorization experiment and carry out the smelting technology of slag recycle.
First adding 40kg dephosphorized slag at 300kg induction furnace in simulation test procedure, within about 2.0 hours, be warming up to 1500 DEG C, insulation 20min, treats that dephosphorized slag is melting down, gets initial sample, CaO=32.28%, SiO2=16.66%, FeO=19.28%, MgO=8.02%, P2O5=6.90%.
Being poured out by melting down slag afterwards, stir and be cooled to 1250-1300 DEG C (slag is spattered in simulation), weigh 20kg dephosphorized slag and put into reactor, question response still seals, and leads to the 9m into C0:N2=1:2.5 in reactor3Coal gas, process 40min, gets middle sample, CaO=35.64%, SiO2=18.39%, FeO=2.80%, MgO=8.85%, P2O5=1.42%, Fe=14.16%, P2O5Reduction ratio 81.3%, FeO reduction ratio 86.2%.
Finally adding the 250kg pig iron at 300kg induction furnace, 1.2kg ferrophosphorus, within about 1.5 hours, be warming up to 1350 DEG C, insulation 20min, treats that molten iron is melting down, gets the initial sample of molten iron, C=4.32%, Si=0.21%, P=0.25%. Rifle blowing is fallen afterwards, rifle position 270mm, oxygen supply intensity 2.0Nm3/ t min, bottom blowing nitrogen intensity 0.20Nm3/ t min, after oxygen blast 30s, lime block, each 1.5kg of light dolomite block are dropped in top, fluorite 0.5kg, and dephosphorized slag 18kg after adding reduction treatment in batches, survey temperature after oxygen blast 500s and get half steel sample and test 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 carries out treatment station waste heat recovery and gaseous state phosphorus recovery work carrying out hot reduction treatment process simultaneously, process finish after converter slag return converter as pre-melted slag and iron content cooling material and again apply. The reduction of converter slag phosphorus load can be realized by above-mentioned slag treatment flow process and converter steelmaking flow process can be returned and realize recycling, it is possible not only to the slag forming material consumption saving converter steelmaking flow process, the waste heat recovery for the treatment of station can also realize the efficient utilization of converter procedure energy, particularly can solve the carbon element waste problem that low-grade coal gas is difficult to recycle, and the utilization of fritting converter slag can make the slagging speed of converter steelmaking flow process journey and scorification degree be optimized.
The above; it is only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, any it is familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.

Claims (10)

1. utilizing gas reduction converter slag and a method for slag recycle, it comprises the following steps:
Converter steelmaking process is divided into converter steelmaking and converter slag thermal treatment two flow processs, and in described converter steelmaking flow process, the impurity element in molten iron enters converter slag in the form of the oxide through oxidizing reaction, forms the hot converter slag of high phosphorus content;
Described converter slag is poured into process slag and fills with unit, entering described converter slag thermal treatment flow process, the process slag filling unit filling converter slag transfers to converter slag treatment station, and in described converter slag treatment station, the generation of described converter slag take coal gas as the hot reduction of reducing medium, wherein
The reduction ratio > 80% of FeO, P2O5Reduction ratio > 80%, hot reduction treatment process carries out waste heat recovery and the gaseous state phosphorus recovery work of described converter slag simultaneously, process finish after converter slag return converter as pre-melted slag and iron content cooling material and again apply.
2. according to right 1, utilize gas reduction converter slag and the method for slag recycle, it is characterised in that, described converter slag is dephosphorized slag and the decarbonized slag of the terminal slag of single slag process smelting technology, double slag process and double-united gear oil pump technique; Wherein the physics weight percent 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%; The physics weight percent 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%.
3. according to right 1, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, it is fill with and the slag car with the slag of bottom blow supplying setting that described process slag fills with unit, described bottom blow supplying setting comprises the gas supply element bottom slag filling, bottom blowing gas pipeline and air feed Controlling System, before converter slag treatment station with converter slag treatment station after institute's air supply source be rare gas element, in converter slag treatment station, institute's air supply source is the coal gas as reducing gas.
4. according to right 3, utilize gas reduction converter slag and the method for slag recycle, it is characterised in that, described coal gas is the coal gas of converter, blast furnace gas and the coke-oven gas that produce in steel manufacture process, and in described coal gas, CO content range is 5%-80%.
5. according to right 4, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, described converter slag treatment station is cavity type converter slag reduction treatment container, and described cavity type converter slag reduction treatment container is salable, the middle pressure that can bear 1.0-5.0MPa, can to lead to into adjustable tolerance be 0.0-3.0Nm3The reducing gas of/t min, carry out slag stirring by machinery arm, gas content can be carried out detection Detoxified treatment, vacuum-pumping, waste heat can be carried out and gaseous state phosphorus reclaims.
6. according to right 5, utilize gas reduction converter slag and the method for slag recycle, it is characterised in that, described Detoxified treatment is lead to described converter slag treatment station to process the coal gas of its inside to safety range into air.
7. according to right 6, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, described process slag is filled with unit and is connected by described bottom blow supplying setting with described converter slag treatment station, and reducing gas is blown in hot converter slag by described converter slag treatment station airing system by described bottom blow supplying setting.
8. according to right 7, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, in described converter slag treatment station, the processing mode of hot slag is that treatment station seals �� is filled with reducing gas and carries out slag reduction �� treatment station exhausting �� be filled with reducing gas and carry out slag reduction �� treatment station exhausting, to loop ends; The pressure range of described converter slag treatment station sealed can is the slag recovery time described in 0.2-5.0MPa is 0-10min; Described " be filled with reducing gas and carry out slag reduction �� treatment station exhausting " cycle index is 1-10 time according to its circulation frequency of the difference in treatment time each time.
9. according to right 8, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, the stirring of converter slag and process waste heat are reclaimed while reducing gas carries out slag reduction by described being filled with machinery arm, described waste-heat recovery device is waste heat boiler, it is treated to low-temperature circulating water through the heat treatment station of high temperature and becomes high-temperature steam, and the heat energy of converter slag treatment scheme is that the electric energy that can recycle carries out second stage employ through waste heat boiler process by high-temperature steam.
10. according to right 9, utilize gas reduction converter slag and the method for slag recycle, it is characterized in that, in described converter slag treatment station, gaseous state phosphorus reclaims and is operated in the exhausting process for the treatment of station and carries out, and to be high-temperature gas make the cooling of gaseous state phosphorus precipitate out and be settled down to accumulator tank through cooling section to its way of recycling.
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Publication number Priority date Publication date Assignee Title
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
CN112979189A (en) * 2021-02-09 2021-06-18 鞍钢股份有限公司 Modification method of converter slag applied to cement production

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JPH09316519A (en) * 1996-05-23 1997-12-09 Sumitomo Metal Ind Ltd Method for reforming smelting slag
CN102264919A (en) * 2008-12-26 2011-11-30 杰富意钢铁株式会社 Method for reclaiming iron and phosphorus from steelmaking slag
CN102471827A (en) * 2009-12-30 2012-05-23 现代制铁株式会社 Method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate
CN103757152A (en) * 2014-01-03 2014-04-30 中冶东方工程技术有限公司 Method and device for treating steel slag

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CN87102831A (en) * 1987-04-20 1988-11-02 冶金部鞍山热能研究所 Method for comprehensively utilizing high-temperature liquid iron-containing slag
JPH09316519A (en) * 1996-05-23 1997-12-09 Sumitomo Metal Ind Ltd Method for reforming smelting slag
CN102264919A (en) * 2008-12-26 2011-11-30 杰富意钢铁株式会社 Method for reclaiming iron and phosphorus from steelmaking slag
CN102471827A (en) * 2009-12-30 2012-05-23 现代制铁株式会社 Method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate
CN103757152A (en) * 2014-01-03 2014-04-30 中冶东方工程技术有限公司 Method and device for treating steel slag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN112979189A (en) * 2021-02-09 2021-06-18 鞍钢股份有限公司 Modification method of converter slag applied to cement production

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