CN103882178A - Converter steelmaking process for recycling converter final slag - Google Patents
Converter steelmaking process for recycling converter final slag Download PDFInfo
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- CN103882178A CN103882178A CN201410129814.5A CN201410129814A CN103882178A CN 103882178 A CN103882178 A CN 103882178A CN 201410129814 A CN201410129814 A CN 201410129814A CN 103882178 A CN103882178 A CN 103882178A
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- converter
- slag
- blowing
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- dephosphorization
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a converter steelmaking process for recycling converter final slag, belonging to the technical field of converter steelmaking. The converter blowing process is divided into two steps including a dephosphorizing step and a decarbonising step; before the beginning of blowing in the dephosphorizing step, 0-70 kg/t of converter final slag in a cooled state is added firstly; then, bowing in the dephosphorizing step is carried out by adding iron and waste steel; slag having low FetO content is produced in the blowing process; deslagging is carried out after blowing; then, blowing in the decarbonising step is carried out; carbon catching and steel tapping are carried out after blowing in the decarbonising step; and converter final slag is remained in the converter and used for an underfired furnace to blow in the dephosphorizing step. The converter steelmaking process for recycling converter final slag disclosed by the invention has the advantages that the best use of converter slag is ensured to the most extent; and loss of steel materials is further reduced for smelting low-TFe dephosphorization slag.
Description
Technical field
The invention belongs to converter steeling technology field, a kind of converter steelmaking process of recycling converter finishing slag is particularly provided, can carry out recycle to hot steel slag and cold conditions slag, significantly reduced converter steelmaking cost.
Background technology
Slag is one of product of steel-making, and the quantity of slag that generally converter smelting steel per ton produces, more than 50kg～80kg, contains a large amount of Fe in slag
to and metal M Fe; By the crushing and screening to converter finishing slag, magnetic separation, can recycle Fe element in a part of slag and that metallic state exists, but most Fe
to can not be recovered, and this part Fe element is wasted.
Because technical progress and the renewal and renovation of equipment of iron and steel enterprise are regenerated, part steelworks adopts the mode of converter duplex to make steel, Zhe Lei steel mill has special dephosphorization converter and decarburization converter, utilize dephosphorization stove that molten iron phosphorus is taken off to a certain degree, between 0.020%～0.040%, carbon content is in 3.0% left and right, molten iron is gone out to hot metal ladle from tap hole, molten iron after dephosphorization is blended into converter decarburization, dephosphorization again to tapping, converter decarbonizing furnace stays finishing slag cold conditions or hotly stays or add in converter for dephosphorization converter slag making, thus the consumption of reduction iron and steel stock.
But most of producer does not have converter duplex technique carries out conventional ability of smelting, the mode of the steel-making recovery slag that this part producer adopts normally converter terminal is partly or completely stayed slag, but the problem of bringing is to stay slag to convert safely the enrichment problem of the impurity element in iron and slag; Slag is stayed in stove can partly replace lower stove slag former, but because must causing slag, the continuous accumulation of the impurity element such as phosphorus, sulphur must discharge, the slag of discharging is still taken away the loss of iron and steel stock, therefore, simple finishing slag stays slag can not significantly reduce iron and steel stock consumption, and what can reduce is only that a small amount of slag making materials of part reduces cost and a small amount of quantity of slag reduces the iron and steel stock consumption of taking away.
Summary of the invention
The object of the present invention is to provide a kind of converter steelmaking process of recycling converter finishing slag, utilize conventional converter can reclaim cold conditions slag and can reclaim again hot steel slag simultaneously.
The method is divided into two converter steelmaking process, be divided into dephosphorization phase (the dephosphorization phase is Primary period) and carbon period, the blowing stage after deslagging is carbon period, dephosphorization phase finishing blowing is poured out the dephosphorized slag that phosphorus content is high, TFe is low, bessemerizing hot recovery converter finishing slag (slag that carbon period finishes) after end tapping, converter finishing slag utilizes at converter internal recycle, and the phosphoric in slag has been enriched in dephosphorized slag, by pouring out dephosphorized slag, phosphoric is discharged; Simultaneously next stove utilizes cold conditions converter finishing slag converting to return to eat before iron, and the phosphoric in slag also finishes to discharge by dephosphorized slag in the dephosphorization phase; The final slag of discharging of this technique is divided into two portions, the dephosphorized slag that a part finished for the converter dephosphorization phase, a part finishes the converter finishing slag of discharge for recycle in addition, and this part finishing slag is again recycled before converting iron in the converter dephosphorization phase and added in Converter by cold conditions.
While blowing in the dephosphorization stage, adopt the slagging process of low TFe, the TFe bessemerizing in dephosphorization stage slag is controlled in alap scope, extremely low with TFe content in the slag slag that ensures to pour out, so also save a large amount of iron and steel stock consumption.
Such smelting process has ensured that converter slag makes the best use of everything to the full extent, and the smelting process of the low TFe of dephosphorized slag has further reduced the loss of iron and steel stock.Conventional slag fragmentation, screening, magnetic separation can also be used in the utilization of dephosphorized slag.
A kind of converter steelmaking process of recycling converter finishing slag of the present invention, its processing step is:
The process of bessemerizing is divided into two, be divided into dephosphorization stage and decarburization stage, before starting, dephosphorization stage blowing first adds the converter finishing slag 0-70kg/t of the state of cooling, then convert iron, add steel scrap and carry out the blowing in dephosphorization stage, converting process is made the slag of low FetO content, carries out deslagging after finishing blowing, then enter the blowing of carbon period, carbon period finishing blowing catch carbon, tapping, converter terminal slag can be stayed converter inside, for the lower stove blowing dephosphorization stage.
As mentioned above, this invention smelting process has following characteristics:
(1) converter top-blow oxygen, dephosphorization stage duration of blast is between 3min-8min, and temperature is controlled between 1290 DEG C～1450 DEG C, finishing blowing deslagging, the control of deslagging amount is at 1/3-2/3,
(2) the dephosphorization stage finishes FetO content in slag slag and is controlled at below 15%, and basicity is controlled at 1.3-2.0;
(3) slag of the state of cooling is treated converter finishing slag, can pass through break process, and the bulk that diameter is greater than more than 5mm adds by steel scrap square sheet of paper used for painting or calligraphy formula, and the microparticle that diameter is less than or equal to below 5mm adds by packing bag.
(4) carbon period converter finishing slag can all be retained in Converter, in the time of catch carbon process grate or before tapping, also can pour out a part of converter finishing slag.
(5) the dephosphorization stage can not add slag making materials completely, adds the slag making materials of minute quantity according to smelting situation yet.
The advantage of this invention is as follows:
(1) the final discharge mode of converter smelting slag is to discharge dephosphorized slag, and phosphoric is enriched in dephosphorized slag, has improved the dephosphorization efficiency of slag making materials;
(2) the hot circulation of converter finishing slag and cold conditions circulate in the use of dephosphorization stage, have recycled the Fe element in slag, have improved recovery rate of iron;
(3) used the converter finishing slag of the high alkalinity of recycling due to the dephosphorization stage, the dephosphorization stage can not add slag making materials, reduced the usage quantity of slag former;
(4) the low Fe of dephosphorization stage slag
tthe smelting of O, in the dephosphorized slag that makes to pour out, iron loss is reduced to minimum level, has significantly reduced iron and steel stock consumption.
Embodiment
Adopt top and bottom combined blown converter to blow, scrap ratio 5%-15%, the process of bessemerizing is divided into two, middle primary slag, converting process comprises that dephosphorization stage and decarburization stage adopt the air supply intensity of 3.0-3.8, smelting process adjustment rifle position and air supply intensity; The converter finishing slag that adds cold conditions to reclaim before blowing starts, the slag of bulk follows steel scrap to add together, and the slag that granularity is less adds with steel scrap after packing, and the clinker that part granularity is moderate adds converter feed bin.The dephosphorization stage according to use finishing slag material number calculates selection and adds lime or do not add lime and smelt, light dolomite or the quantity of slag such as light-burned are selected to add or do not add according to the height of the height of MgO content in slag and basicity, FetO content.Carbon period normally blows, and adds slag making materials to carry out slag making, and finishing blowing tapping, carries out slag splashing after tapping, and all slags are stayed in stove, before lower stove blowing, repeats to start that step most: in converter, add cooling converter finishing slag, convert iron.
Embodiment:
Smelting scheme: adopt l00t converter to smelt, add converter finishing slag cold burden 0-70kg/t before converting iron, head batch slag lime add-on 0-30kg/t left and right, adds ore etc. to change slag, pours out the quantity of slag when deslagging more than 1/3, and two batches of slags add lime 20-4-kg/t.The low temperature control of terminal, 1650 DEG C of target catch carbon temperature, after tapping, then slag splashing stays slag.
Molten iron Intake Quantity is at 101t, 99t, and adding amount of scrap steel is respectively 8t, 11t; Molten iron situation is as shown in following table l, and blowing parameter is as shown in table 2 below.
Table 1 molten iron main component (quality percentage composition %, surplus is Fe)
| Case | Steel grade | C | Si | Mn | P | S | Molten iron temperature DEG C |
| 1 | Q345R | 4.67 | 0.50 | 0.14 | 0.088 | 0.035 | 1293 |
| 2 | D36-1 | 4.45 | 0.48 | 0.12 | 0.085 | 0.028 | 1302 |
Table 2 auxiliary material add-on
| Case | Convert the front cold conditions finishing slag add-on of iron | Dephosphorization phase lime | Carbon period lime |
| 1 | 28kg／t | 20kg/t | 25kg/t |
| 2 | 65kg/t | 0 | 30kg/t |
The dephosphorizing pretreatment stage adopts duration of blast 5.5-7.5 minute, and top blast oxygen supply intensity is 3.0M
3/ min/t, following table is result after dephosphorizing pretreatment.
Table 3 dephosphorization finishes rear molten iron impurity component, temperature (quality percentage composition %, surplus is Fe)
| Case | Steel grade | C | P | S | Temperature DEG C |
| 1 | Q345R | 3.12 | 0.028 | 0.015 | 1348 |
| 2 | D36-1 | 2.93 | 0.035 | 0.017 | 1335 |
The table 4 dephosphorization of molten iron phase finishes the main component (quality percentage composition %) of rear slag
| Case | TFe | FeO | SiO2 | CaO | MgO | P 2O 5 |
| 1 | 12.97 | 11.65 | 17.99 | 38.35 | 12.07 | 2.53 |
| 2 | 13.32 | 12.85 | 18.27 | 40.11 | 11.58 | 2.49 |
After the dephosphorization phase finishes, carbon period adopts flow 22000Nm3/min.t, and converter terminal phosphorus content is 0.008%～0.015%.After slag splashing, all slags are stayed in converter, for lower stove.
Table 5 experimental converter end phosphorus content
| Case | Steel grade | P content |
| 1 | Q345R | 0.008 |
| 2 | D36-1 | 0.0l4 |
Claims (4)
1. recycle the converter steelmaking process of converter finishing slag for one kind, it is characterized in that, the process of bessemerizing is divided into two, be divided into dephosphorization stage and decarburization stage, before starting, dephosphorization stage blowing first adds the converter finishing slag 0-70kg/t of the state of cooling, then convert iron, add steel scrap and carry out the blowing in dephosphorization stage, converting process is made low Fe
tthe slag of O content, carries out deslagging after finishing blowing, the blowing that then enters carbon period, and carbon period finishing blowing catch carbon, tapping, converter terminal slag is stayed converter inside, for the lower stove blowing dephosphorization stage.
2. technique according to claim 1, is characterized in that, the described dephosphorization stage: converter top-blow oxygen, and duration of blast is between 3min-8min, and temperature is controlled between 1290 DEG C～1450 DEG C, finishing blowing deslagging, the control of deslagging amount is at 1/3-2/3;
The dephosphorization stage finishes FetO content in slag slag and is controlled at below 15%, and basicity is controlled at 1.3-2.0.
3. technique according to claim 1, it is characterized in that, the slag of the described state of cooling is treated converter finishing slag, through break process, the bulk that diameter is greater than more than 5mm adds by steel scrap square sheet of paper used for painting or calligraphy formula, and the microparticle that diameter is less than or equal to below 5mm adds by packing bag.
4. technique according to claim 1, is characterized in that, described carbon period converter finishing slag is all retained in Converter, or pours out a part of converter finishing slag in the time of catch carbon process grate or before tapping.
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| CN201410129814.5A CN103882178A (en) | 2014-04-01 | 2014-04-01 | Converter steelmaking process for recycling converter final slag |
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|---|---|---|---|
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112598A (en) * | 2015-09-29 | 2015-12-02 | 山东钢铁股份有限公司 | Method for converter steelmaking by directly using bottom slag produced by converter |
| CN105821177A (en) * | 2016-05-03 | 2016-08-03 | 首钢京唐钢铁联合有限责任公司 | Full-tri-de technological method for converter and method for reducing total slag amount |
| CN108251590A (en) * | 2018-03-14 | 2018-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for improving converter lining life |
| CN108315524A (en) * | 2018-02-28 | 2018-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of reducing semi-steel making supplementary product onsumption |
| CN108315525A (en) * | 2018-04-27 | 2018-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | semi-steel dephosphorizing method |
| CN108330243A (en) * | 2018-03-14 | 2018-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of it reducing converter lining and corrodes |
| CN111944936A (en) * | 2020-07-10 | 2020-11-17 | 首钢京唐钢铁联合有限责任公司 | Method for utilizing latent heat of slag of decarburization furnace |
| CN113801973A (en) * | 2021-08-17 | 2021-12-17 | 首钢集团有限公司 | Smelting method for converter steel slag resource production |
| CN114292983A (en) * | 2022-01-07 | 2022-04-08 | 鞍钢股份有限公司 | Production method of high-phosphorus steel |
| CN114854930A (en) * | 2022-05-12 | 2022-08-05 | 河北荣信钢铁有限公司 | Cold slag slagging agent for converter steelmaking and use method thereof |
| CN115369308A (en) * | 2022-07-15 | 2022-11-22 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-strength IF steel |
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| JPH01316409A (en) * | 1988-06-14 | 1989-12-21 | Sumitomo Metal Ind Ltd | Method for dephosphorizing molten iron accompanied with scrap melting |
| CN101560586A (en) * | 2009-04-23 | 2009-10-21 | 重庆大学 | Compound dephosphorization agent with converter slag as raw material and preparing method thereof |
| CN102676726A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | Smelting process capable of utilizing converter slag fully |
| CN102965463A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN103498016A (en) * | 2013-10-12 | 2014-01-08 | 钢铁研究总院 | Dephosphorization agent prepared by taking slag of decarbonization furnace as raw material and molten iron dephosphorization method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01316409A (en) * | 1988-06-14 | 1989-12-21 | Sumitomo Metal Ind Ltd | Method for dephosphorizing molten iron accompanied with scrap melting |
| CN101560586A (en) * | 2009-04-23 | 2009-10-21 | 重庆大学 | Compound dephosphorization agent with converter slag as raw material and preparing method thereof |
| CN102676726A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | Smelting process capable of utilizing converter slag fully |
| CN102965463A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN103498016A (en) * | 2013-10-12 | 2014-01-08 | 钢铁研究总院 | Dephosphorization agent prepared by taking slag of decarbonization furnace as raw material and molten iron dephosphorization method |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112598A (en) * | 2015-09-29 | 2015-12-02 | 山东钢铁股份有限公司 | Method for converter steelmaking by directly using bottom slag produced by converter |
| CN105821177A (en) * | 2016-05-03 | 2016-08-03 | 首钢京唐钢铁联合有限责任公司 | Full-tri-de technological method for converter and method for reducing total slag amount |
| CN108315524A (en) * | 2018-02-28 | 2018-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of reducing semi-steel making supplementary product onsumption |
| CN108251590A (en) * | 2018-03-14 | 2018-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for improving converter lining life |
| CN108330243A (en) * | 2018-03-14 | 2018-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of it reducing converter lining and corrodes |
| CN108315525A (en) * | 2018-04-27 | 2018-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | semi-steel dephosphorizing method |
| CN111944936A (en) * | 2020-07-10 | 2020-11-17 | 首钢京唐钢铁联合有限责任公司 | Method for utilizing latent heat of slag of decarburization furnace |
| CN111944936B (en) * | 2020-07-10 | 2022-03-18 | 首钢京唐钢铁联合有限责任公司 | Method for utilizing latent heat of slag of decarburization furnace |
| CN113801973A (en) * | 2021-08-17 | 2021-12-17 | 首钢集团有限公司 | Smelting method for converter steel slag resource production |
| CN114292983A (en) * | 2022-01-07 | 2022-04-08 | 鞍钢股份有限公司 | Production method of high-phosphorus steel |
| CN114854930A (en) * | 2022-05-12 | 2022-08-05 | 河北荣信钢铁有限公司 | Cold slag slagging agent for converter steelmaking and use method thereof |
| CN115369308A (en) * | 2022-07-15 | 2022-11-22 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-strength IF steel |
| CN115369308B (en) * | 2022-07-15 | 2023-09-15 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-strength IF steel |
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Application publication date: 20140625 |