CN106811576A - Converter slag thermal state recycling method - Google Patents

Converter slag thermal state recycling method Download PDF

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Publication number
CN106811576A
CN106811576A CN201510870406.XA CN201510870406A CN106811576A CN 106811576 A CN106811576 A CN 106811576A CN 201510870406 A CN201510870406 A CN 201510870406A CN 106811576 A CN106811576 A CN 106811576A
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slag
converter
ladle
molten steel
steel
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CN201510870406.XA
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CN106811576B (en
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赵成林
廖相巍
张宁
朱晓雷
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a thermal state recycling method of converter slag, wherein the slag discharge amount is not controlled in the converter tapping process, and a slag reducing agent is uninterruptedly added to the inner slag surface of a steel ladle in the process of pouring the slag back into the steel ladle; the high-temperature area formed by heating the LF electrode is utilized to realize the chemical reaction of the slag reducing agent and the phosphorus, silicon, manganese and iron oxide in the slag, and simultaneously bottom blowing stirring is carried out, wherein the gas flow is 0.04-0.12 Nm3H.t, the stirring time is 5-20 min; after the slag is fully reduced, alloying treatment is carried out on the molten steel according to the influence of the reduced slag on the phosphorus, silicon and manganese components of the molten steel and the steel grade requirement; and after the pouring is finished, pouring the hot casting residue onto the surface of the molten iron after slagging off, and adding the hot casting residue into a converter along with the molten iron. The invention not only saves the alloy consumption and the steel material consumption in the molten steel alloying process, but also saves the slag material consumption in the reduction refining process, and realizes the thermal state recycling of the converter slag.

Description

A kind of hot circulation utilization method of vessel slag
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of hot circulation utilization method of vessel slag.
Background technology
Vessel slag is to produce most solid waste in convertor steelmaking process, is also that iron and steel enterprise can develop Precious resources.The mineral structure of vessel slag depends primarily on chemical composition, when the basicity of slag (CaO/SiO2)<When 1.8, essential mineral is CMS (forsterite), C3MS2(manganolite);Basicity is During 1.8-2.5, essential mineral is C2S (dicalcium silicate), C2F (dicalcium ferrite) and RO phases (Fe based on FeO, Mn, Mg bivalent metal oxide solid solution);When basicity is more than 2.5, essential mineral is C3S (tricalcium silicate), C2S、C2F and RO phases, also contain a small amount of free calcium oxide in addition in slag, typical converter slag ingredient is such as Following table.
The typical converter slag ingredient of table 1, %
CaO MgO MnO FeO S
40-50 10-15 8-10 1-3 0.5-1.5 15-25 <2 <0.1
At present, domestic steel mill's vessel slag is reclaimed and mainly include two kinds of techniques of cold conditions recovery and hot recovery.Cold conditions is returned Receive and generally use drum process and hot vexed method technique, with taking up an area that small, treatment effeciency is high, slag sluicing system more thoroughly, The features such as tailing particles are small, with reference to current slag micro powder technology, can effectively reclaim the iron money in vessel slag Source, while producing construction material.Hot recovery mainly include converter double slag, duplexs and stay slag technique, Ji Jiangshang The vessel slag that one stove is smelted stays a part that the smelting of next stove is participated in stove, is had using molten state vessel slag Slag characteristic, higher alkalisation, higher oxygen etc., realize the rapid slagging of steelmaking process and save slag charge disappearing Consumption, the part that this technique realizes vessel slag recycles.
The content of the invention
It is an object of the invention to provide a kind of hot circulation utilization method of vessel slag, i.e., gone back by vessel slag Original place is managed, and desulfurization, deoxidation treatment is carried out to molten steel using the vessel slag after reduction, while can also be to vessel slag In beneficial element and ferro element reclaimed, it can in addition contain by the vessel slag after reduction come back to converter after It is continuous to recycle.
A kind of hot circulation utilization method of vessel slag, its technical scheme includes:
(1) converter tapping process does not control the lower quantity of slag, the molten steel in converter is all entered in ladle as far as possible, while A part of molten state vessel slag in converter is set to enter in ladle, it is ensured that the ratio of the quantity of slag and Metal Weight is 0.005-0.02, during slag is reversed to ladle introversion, adds slag to the top of the slag in ladle incessantly Reducing agent.
(2) ladle is transported to LF treating stations after converter tapping terminates, the high-temperature region reality formed using LF heated by electrodes Existing slag reduction agent and phosphorus, silicon, manganese, the chemical reaction of ferriferous oxide in slag, while using bottom blowing stirring gas Body is stirred, and gas flow is 0.04Nm3/ ht~0.12Nm3/ ht, mixing time is 5min-20min.
(3) after slag is reduced sufficiently, Bottom Blowing Gas Flow Rate to 0.25Nm is increased3/ ht~0.40Nm3/ ht, profit Reduction refining is carried out to molten steel with slag, molten steel desulfurizing, deoxy technology requirement is met, while according to slag reduction Afterwards to molten steel phosphorus, silicon, the influence of manganese composition and steel grade requirement, Alloying Treatment is carried out to molten steel, wait molten steel into Upper machine after meeting requirement with temperature is divided to cast.
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, more than hot casting The molten iron surface that slag is poured into after skimming, is hereafter blended into converter with molten iron.(P in due to thermal slag2O5) (SiO2) be partially reduced, therefore there is slag high alkalinity, high phosphorus to hold and the features such as molten state, Ke Yican With the dephosphorisation reaction in converter, the consumption of converter slag-making material is saved, while converter rapid slagging can be realized, shortened The converter producing time.
A kind of hot circulation utilization method of vessel slag as described above, it is characterised in that:Molten steel stirring gas can be with It is Ar, N2、CO2In one or more.
A kind of hot circulation utilization method of vessel slag as described above, it is characterised in that:Slag reduction agent it is main Component can be one or more of aluminium, carbon, calcium, and the addition of slag reduction agent meets can be converter The oxide Restore All of phosphorus, silicon, iron, manganese in slag is simple substance.
The present invention has the advantages that compared with prior art:
Reduced by by the phosphorus in slag, silicon, manganese, ferriferous oxide, on the one hand can realized to having in vessel slag The recovery of beneficial element and ferro element, saves the alloy consumption and steel technology of molten steel alloying process, another Aspect can also carry out reduction essence to molten steel using the high alkalinity of slag, low oxidative and melting characteristic after reduction Refining, saves the slag charge consumption of reduction refining process, and the slag after reduction can also be returned in converter and is continuing with, Realize that the hot of vessel slag is recycled.
Specific embodiment
Embodiment 1:
(1) converter tapping quantity 250t, tapping process does not control the lower quantity of slag, the molten steel in converter is all entered as far as possible In entering ladle so that during a part of molten state vessel slag pours into ladle in converter, the quantity of slag is 2.1t in ladle, During slag is reversed to ladle introversion, a certain amount of carburant conduct is added to the top of the slag in ladle incessantly Slag reduction agent, carbon content is 90% in carburant, and carburant 470kg is added altogether.
(2) ladle is transported to LF treatment stations, slag and molten steel is heated using LF graphite electrodes, together The high-temperature area that Shi Liyong LF graphite electrodes are formed completes reducing agent with (P in vessel slag2O5)、(SiO2)、(MnO)、 (FeO) reaction, electrode voltage 435V, electric current 50000A.It is stirred using argon bottom-blowing simultaneously, bottom The Nm of Argon throughput 203/ h, mixing time 14min, processing procedure does not add any slag material.
(3) after slag is fully reduced, argon bottom-blowing flow to 80 Nm is increased3/ h carries out desulfurization to molten steel, takes off Oxygen and it is sufficiently stirred for, upper machine casting after corresponding alloying is carried out thereafter according to steel grades requirement.
Molten steel, slag composition before converter tapping and LF alloyings is as shown in table 2.As can be seen from the table, Reduction treatment is carried out to slag by using reducing agent so that (the P before LF alloyings in slag2O5)、(SiO2)、 (MnO), (FeO) content decreases than converter tapping process, while can make molten steel after slag is reduced [Si], [Mn], [P] content increased.
The molten steel of table 2 and slag composition change, %
[C] [Si] [Mn] [P] [S] (MnO) (FeO)
Converter tapping 0.04 0.01 0.05 0.013 0.020 1.2 12.3 2.1 17.8
Before LF alloyings 0.15 0.045 0.062 0.016 0.022 0.2 3.7 0.3 2.9
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, by hot casting The molten iron surface that recrement is poured into after skimming, is hereafter blended into converter with molten iron.
Embodiment 2:
(1) converter tapping quantity 253t, tapping process does not control the lower quantity of slag, the molten steel in converter is all entered as far as possible In entering ladle so that during a part of molten state vessel slag pours into ladle in converter, the quantity of slag is 2.5t in ladle, During slag is reversed to ladle introversion, a certain amount of metallic aluminium conduct is added to the top of the slag in ladle incessantly Slag reduction agent, adds metallic aluminium 400kg altogether.
(2) ladle is transported to LF treatment stations, slag and molten steel is heated using LF graphite electrodes, together The high-temperature area that Shi Liyong heating processes are formed completes metallic aluminium with (P in vessel slag2O5)、(SiO2)、(MnO)、 (FeO) reaction.Electrode voltage 435V, electric current 50000A, while being stirred using bottom blowing nitrogen, bottom The Nm of nitrogen flushing throughput 153/ h, mixing time 10min, processing procedure does not add any slag material.
(3) after slag reduction, bottom blown gas are switched into argon gas, increases argon bottom-blowing flow to 90 Nm3/ h, Complete the desulfurization of molten steel, deoxidation and be sufficiently stirred for, after carrying out corresponding alloying thereafter according to steel grades requirement Upper machine casting.
Molten steel, slag composition before converter tapping and LF alloyings is as shown in table 3.As can be seen from the table, Reduction treatment is carried out to slag by using reducing agent so that (the P in vessel slag2O5)、(SiO2)、(MnO)、 (FeO) it is reduced, causes that [Si], [Mn] of molten steel, [P] content increased after reduction.
The molten steel of table 3 and slag composition change, %
[C] [Si] [Mn] [P] [S] (MnO) (FeO)
Converter tapping 0.035 0.01 0.05 0.015 0.025 1.1 14.2 1.8 19.3
Before LF alloyings 0.05 0.04 0.058 0.017 0.025 0.17 4.5 0.28 2.5
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, by hot casting The molten iron surface that recrement is poured into after skimming, is hereafter blended into converter with molten iron.

Claims (3)

1. the hot circulation utilization method of a kind of vessel slag, it is characterised in that comprise the following steps:
(1) converter tapping process does not control the lower quantity of slag, the molten steel in converter is all entered in ladle as far as possible, while A part of molten state vessel slag in converter is set to enter in ladle, it is ensured that the ratio of the quantity of slag and Metal Weight is 0.005-0.02, during slag is reversed to ladle introversion, adds slag to the top of the slag in ladle incessantly Reducing agent;
(2) ladle is transported to LF treating stations after converter tapping terminates, the high-temperature region reality formed using LF heated by electrodes Existing slag reduction agent and phosphorus, silicon, manganese, the chemical reaction of ferriferous oxide in slag, while using bottom blowing stirring gas Body is stirred, and gas flow is 0.04Nm3/ ht~0.12Nm3/ ht, mixing time is 5min-20min;
(3) after slag is reduced sufficiently, Bottom Blowing Gas Flow Rate to 0.25Nm is increased3/ ht~0.40Nm3/ ht, profit Reduction refining is carried out to molten steel with slag, molten steel desulfurizing, deoxy technology requirement is met, while according to slag reduction Afterwards to the requirement of molten steel phosphorus, silicon, the influence of manganese composition and steel grade, Alloying Treatment, molten steel composition are carried out to molten steel Meet upper machine after requiring with temperature to cast;
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, more than hot casting The molten iron surface that slag is poured into after skimming, is hereafter blended into converter with molten iron.
2. the hot circulation utilization method of a kind of vessel slag according to claim 1, it is characterised in that:Steel Water stirring gas is Ar, N2、CO2In one or more.
3. the hot circulation utilization method of a kind of vessel slag according to claim 1, it is characterised in that:Stove The main component of slag reducing agent is one or more of aluminium, carbon, calcium, and the addition of slag reduction agent meets Can be simple substance the oxide Restore All of the phosphorus in vessel slag, silicon, iron, manganese.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109609721A (en) * 2018-12-19 2019-04-12 钢铁研究总院 A kind of method that converter recycles the hot casting residue of ladle
CN109797338A (en) * 2019-02-11 2019-05-24 黑龙江建龙钢铁有限公司 A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique
CN110669900A (en) * 2019-10-08 2020-01-10 安徽富凯特材有限公司 Method for reutilization of AOD pre-reduced slag
CN111996314A (en) * 2020-07-31 2020-11-27 鞍钢股份有限公司 Method for extracting iron by using carbon reduction thermal state converter slag
CN115491444A (en) * 2022-08-30 2022-12-20 马鞍山钢铁股份有限公司 Method for preventing ladle from sticking and splashing by returning ladle casting residue to converter in hot state

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109609721A (en) * 2018-12-19 2019-04-12 钢铁研究总院 A kind of method that converter recycles the hot casting residue of ladle
CN109797338A (en) * 2019-02-11 2019-05-24 黑龙江建龙钢铁有限公司 A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique
CN110669900A (en) * 2019-10-08 2020-01-10 安徽富凯特材有限公司 Method for reutilization of AOD pre-reduced slag
CN110669900B (en) * 2019-10-08 2021-08-06 安徽富凯特材有限公司 Method for reutilization of AOD pre-reduced slag
CN111996314A (en) * 2020-07-31 2020-11-27 鞍钢股份有限公司 Method for extracting iron by using carbon reduction thermal state converter slag
CN115491444A (en) * 2022-08-30 2022-12-20 马鞍山钢铁股份有限公司 Method for preventing ladle from sticking and splashing by returning ladle casting residue to converter in hot state
CN115491444B (en) * 2022-08-30 2024-01-30 马鞍山钢铁股份有限公司 Method for preventing ladle from adhering and splashing by hot return of ladle casting residue to converter

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