CN102212640A - Convertor steelmaking method capable of reducing slag quantity - Google Patents
Convertor steelmaking method capable of reducing slag quantity Download PDFInfo
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Abstract
The invention belongs to the technical field of convertor steelmaking, and provides a convertor steelmaking method capable of reducing slag quantity. The process flow disclosed by the invention is circular process flow starting with step of protecting a furnace by slag splashing and ending with the step of remaining slag in the furnace. The process flow specifically comprises the following eight stages: protecting a furnace by slag splashing; curing liquid slag in the furnace; adding scrap steel; adding molten iron; blowing-dephosphorizing at a first stage; deslagging in the middle; blowing-decarbonizing at a second stage; tapping; and remaining slag in the furnace. Compared with the conventional convertor steelmaking process, the convertor steelmaking provided by the invention has the beneficial effects that lime consumption is lowered by 40.5%, light-roasting dolomite consumption is lowered by 76.8%, and the total consumption of the lime and light-roasting dolomite is lowered by 55.5% on the premise that phosphorus content at the end point is not more than 0.015%.
Description
Technical field
The invention provides a kind of converter process that reduces the quantity of slag, belong to the converter steeling technology field.
Background technology
For traditional converter process, in order to guarantee dephosphorization effect, often need high basicity and big quantity of slag operation, cause slag quantity discharged and iron and steel stock consumption to increase, increased production cost.Many bibliographical informations are (as [2007 China Steel nd Annual Meeting collection], 1 (2007), p.1-62) quantity of slag of traditional converter process generation calculates that according to CaO content in the slag 40% CaO weight is generally 48～60 kilograms of ton steel in the slag generally 120～150 kilograms of ton steel.Using under fat lime (CaO%=92) condition, have document (for example, [steel-making], 1 (2002), p.30) reported that lime ton steel consumption has still reached 30～40 kilograms, 20 kilograms of light dolomite ton steel consumptions.Consider from national energy-saving and emission-reduction policy and steel mill self cost angle, be necessary on existing basis, to reduce the slag quantity discharged significantly.
The number of patent application 2007-45040 of Japan discloses " molten iron method of refining (molten Milling Jing And-chain method) ", this method is based on same block converter, utilize dephosphorizations such as CaO and oxygen earlier, basicity of slag is 2.2～3.5 behind the dephosphorization, and T.Fe concentration is 10～30%, and temperature is higher than 1320 degree, carrying out deslagging then handles, the deslagging rate is added manganese ore at last greater than 60%, carries out carbonization treatment.By utilizing this method, dephosphorizing process dephosphorization of molten iron rate is 85～92%, and whole process Mn yield is 31.2～48.1%.But this method is not set forth terminal point and is stayed slag, utilizes and to spatter slag and solidify slag and furnace lining is protected etc., neither be purpose to reduce the quantity of slag.
Chinese patent application numbers 200710023019.8 discloses " medium-phosphorus hot metal converter high efficiency dephosphorating smelting process ", and this method also finishes the back at dephosphorization and implements the deslagging operation, and dephosphorized slag basicity is controlled at 2.0～3.0, and the deslagging temperature is controlled at 1470 ℃.By this method, phosphorus content can be controlled at and be lower than 0.01% in the decarburization terminal point steel, but this patent does not provide lime and light dolomite consumption, neither be purpose to reduce the quantity of slag.
Summary of the invention
The object of the present invention is to provide a kind of converter process that reduces the quantity of slag, conventional converter steelmaking process lime and the big problem of light dolomite consumption have been solved, promptly significantly reduced the slag growing amount, when the decarburization end phosphorus content satisfies smelting requirements, improve recovery rate of iron, guaranteed life of converter.
Technical solution of the present invention is: this technical process is a cyclic process, and starting point is decided to be slag splashing, and terminal point is to stay slag in the stove; Solidified, add steel scrap, be blended into molten iron, stayed eight stages of slag to form in blowing-dephosphorization stage fs, middle deslagging, subordinate phase blowing-decarburization stage, tapping and the stove by liquid slag in slag splashing, the stove, specifically the technological operation step is as follows:
The slag that utilization is stayed in the stove carries out slag splashing, for new round-robin begins, pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 30～50%, spatter the slag process and use at least a in rhombspar and the light dolomite as slag supplying agent, decarbonized slag residual behind the slag splashing is cured operation, solidifying agent is a lime, adds steel scrap then and continues to solidify residual decarbonized slag; Carry out blowing-dephosphorization stage fs after being blended into molten iron, implement oxygen rifle oxygen-supply operation, be equipped with bottom blowing; In the middle deslagging stage, the MgO content after the control dephosphorization finishes in molten iron temperature, basicity and the dephosphorized slag is to guarantee the deslagging amount; In the decarburization stage, guarantee that the molten steel end phosphorus content is not more than 0.015%, control decarburization finishing slag MgO content 7.0～16%, protection converter lining and shortening slag splashing time;
Slag splashing time requirement is not more than 6 minutes;
Pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 30～40% o'clock, this technical process can circulate 3 times, pours out the decarburization quantity of slag before the slag splashing and accounts for the quantity of slag 40～50% o'clock, and this technical process can circulate 4 times;
Behind slag splashing, add 4～10 kilograms of lime of ton steel, add steel scrap then, slag at the bottom of the lasting cool furnace further solidifies the interior liquid slag of stove;
Control oxygen supply intensity greater than 3.0Nm in the dephosphorization stage
3/ t/min, bottom blowing gas intensity are 0.048～0.16Nm
3/ t/min;
Control dephosphorization terminal point bath temperature is at 1355～1420 ℃, and dephosphorization stage basicity is controlled at 1.1～2.5, and the MgO content requirement is 5.5～8.0% in the dephosphorized slag, and reaching dephosphorization end back deslagging amount is 40～70%.
The decarbonized slag that utilization of the present invention is stayed in the stove carries out slag splashing, it is excessive and can cause the slag splashing overlong time time to observe institute's decarburization quantity of slag of staying before slag splashing, after can suitably pouring out the part slag, the amount of pouring out accounts for the quantity of slag 30～40% o'clock, this technical process can circulate 3 times, pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 40～50% o'clock, this technical process can circulate 4 times.
The present invention is directed to the liquid slag of staying in the stove after the tapping and implement the slag splashing operation, slag is spattered on the furnace wall, the slag that stays is fully solidified, splash takes place when having avoided next stove to convert iron and improved converter lining life.Slag splashing of the present invention is in top and bottom combined blown converter, and slag is impacted with spray gun high pressure blow smelting operation nitrogen in the tapping back, makes slag disperse, be attached to and carries out slag splashing on the furnace wall; Use at least a in rhombspar and the light dolomite as slag supplying agent;
The present invention makes on the slag solidified basis at slag splashing, adds 4～10 kilograms of lime of ton steel, adds steel scrap then, continues slag in the cool furnace, and solidification effect and safety coefficient are guaranteed, and converts that the splash rate is zero in the iron process.Weight of molten iron per-cent is 90～92%, and the steel scrap weight percent is 8～10%.
The present invention adopts big oxygen-supply operation in the fs (dephosphorization stage), fully stirs slag, promotes slag iron interface dephosphorisation reaction speed.Oxygen supply intensity is greater than 3.0Nm
3/ t/min, bottom blowing gas intensity are 0.048～0.16Nm
3/ t/min.
Fs of the present invention (dephosphorization stage) finishes the back and implements the deslagging operation.The deslagging amount need satisfy following three conditions in order to reach 40～70%:
(1) dephosphorization terminal point bath temperature is controlled at 1355～1420 degree, and dephosphorizing process is by adding the iron ore controlled temperature;
(2) MgO content is controlled at 5.5～8.0% in the fs slag, to guarantee the slag flowability
(3) basicity is controlled at 1.1～2.5 the dephosphorization stage, and basicity is according to last circulation institute's decarburization quantity of slag of staying and basicity and the control of this circulation molten iron silicon content.
The present invention does not limit subordinate phase (decarburization stage) basicity of slag, can satisfy end phosphorus content is not more than 0.015% and gets final product, finishing slag MgO content is controlled at 7.0～16%, tapping finishes the back slag and all stays in the stove, contained FetO and residual metallic iron are stayed in the stove in the slag, and recovery rate of iron improves.
Set forth the reason of the scope of application of the present invention below:
The present invention does not do any restriction in the slag splashing stage for spattering slag rifle position and air supply intensity, as long as can evenly spatter in the furnace wall.Use at least a in rhombspar and the light dolomite as slag supplying agent, use carbon containing magnesium ball also can, but can cause steel-making cost to increase.For tapping at a certain round-robin and staying the slag stage, it is excessive and can cause the slag splashing overlong time time to observe institute's quantity of slag of staying, enter next circulation after can suitably pouring out the part decarbonized slag, the present invention does not limit deslagging amount in this case, but according to the production practice result, the amount of pouring out is 30～50% promptly can satisfy the slag splashing requirement, also can keep 3-4 circulation of this technical process.
(1) the present invention makes on the slag solidified basis at slag splashing, adds about 4～10 kilograms of lime of ton steel and further solidify slag before being blended into molten iron.According to test-results, add-on is lower than 4 kilograms of lime of ton steel, and the slag solidification effect is bad, needs secondary to spatter slag, influences the production cycle.Add-on can increase consumption greater than 10 kilograms of lime of ton steel, is unfavorable for that also dephosphorization finishes the back deslagging.
(2) the present invention adopts big oxygen-supply operation in the fs (dephosphorization stage).Oxygen supply intensity is lower than 3.0Nm
3/ t/min can influence the mass transfer velocity of Vanadium Pentoxide in FLAKES in slag that slag iron interface generates.Bottom blowing gas intensity is lower than 0.048Nm
3/ t/min can influence dephosphorisation reaction speed and bath temperature homogeneity, and bottom blowing gas intensity is greater than 0.16Nm
3/ t/min can cause the anti-material infringement of furnace bottom serious.Dephosphorization terminal point bath temperature is lower than 1355 degree can influence the slag flowability, is unfavorable for deslagging, and dephosphorization terminal point bath temperature is higher than 1420 degree then can reduce the aggravation of dephosphorization effect and decarburizing reaction.Use the i.e. controlled temperature effectively of iron ore control dephosphorizing process temperature, contrast steel scrap simultaneously and can improve iron oxide content in the slag, make the bits foamed, help deslagging.Dephosphorization stage basicity is controlled at 1.1～2.5, hangs down excessively to make dephosphorization effect not obvious, and the too high lime consumption that makes increases.
(3) fs of the present invention (dephosphorization stage) finishes back enforcement deslagging operation, and the deslagging amount is 40～70%.The deslagging amount is lower than 40% and can causes staying entirely under the slag condition at decarbonized slag and only can circulate 2 times, need pour out decarbonized slag that part is stayed, and has promptly influenced the production cycle, has also caused the increase of cost.The deslagging amount can cause deslagging time lengthening and cost to increase greater than 70%.MgO content is higher than under 8.0% condition in the dephosphorized slag, the mobile variation of slag, and the deslagging amount can not satisfy greater than 40%.MgO content is lower than under 5.5% condition in the dephosphorized slag, even deslagging is all right, but the serious furnace lining that corrodes.
(4) subordinate phase of the present invention (decarburization stage) does not limit basicity, but according to generating practice result, even finishing slag basicity of the present invention is controlled at 2.8～3.0, still can be not more than 0.015% by the stable endpoint phosphorus content.Finishing slag MgO content can make lining erosion serious less than 7.0%, and being higher than 16% can making slag difficulty, causes the metal splash, and finishing slag MgO content is controlled at 10.0～14.5% better effects if, promptly can effectively protect furnace lining, reduces the metal splash and help slag splashing.
Beneficial effect of the present invention:
(1) is applicable to and builds up steel mill, needn't arrange existing installation and steelshop and do big change.
(2) dephosphorization of molten iron (containing desiliconization) and decarburization steel-making blowing is carried out in same converter, after dephosphorization finishes, pours out the part slag, carries out the decarburization blowing then.Decarburization finishes the back employing and stays slag operation, and splash and protection converter lining life take place when next stove is converted iron, adopts slag splashing to operate, and slag is spattered on the furnace wall.Add lime as solidifying agent after spattering slag, add steel scrap then liquid slag is fully solidified, process safety coefficient and converter lining life improve.
(3) adopt dephosphorization under the cold condition, dephosphorization effect is better, and dephosphorization is poured out the part dephosphorized slag after finishing, and helps the control rephosphorization of decarburization stage or continues dephosphorization.
(4) dephosphorization is not poured out molten iron after finishing, decarburization blowing stage heat affluence, and it is temperature required to satisfy follow-up refining process.
(5) blow end point tapping back slag is all stayed in the stove or is poured out on a small quantity, and contained FeO and metallic iron are stayed in the stove in the slag, and the metal yield improves.
(6) more conventional converter steelmaking process is produced when hanging down phosphoretic steel, and lime and light dolomite consumption reduce more than 40%.
(7) add enough slag charges in the decarburization stage, can satisfy the needs that ultra-low phosphoretic steel is produced.
(8) this technology is unrestricted to the steel scrap kind.
Contrast conventional converter steelmaking process, be not more than under 0.015% prerequisite at end phosphorus content, lime consumption has reduced by 40.5%, and light dolomite consumption has reduced by 76.8%, and the two wastage in bulk or weight has reduced by 55.5%.
Description of drawings
Fig. 1 is a kind of converter process process flow sheet that reduces the quantity of slag of the present invention;
Fig. 2 reduces the quantity of slag for the present invention is a kind of preceding deslagging amount of converter process slag splashing and decarburization finish to stay full slag cycle index time relation figure;
Fig. 3 reduces converter process fs (dephosphorization stage) the end back bath temperature of the quantity of slag and the graph of a relation between the deslagging amount for the present invention is a kind of;
Fig. 4 is a kind of converter process fs (dephosphorization stage) basicity of the quantity of slag and graph of a relation of phosphor partition ratio of reducing of the present invention;
Fig. 5 reduces the quantity of slag for the present invention the is a kind of converter process fs (dephosphorization stage) finishes the graph of a relation between MgO content in back deslagging amount and the slag;
Fig. 6 is a kind of converter process technological process dephosphorization rate variation diagram that reduces the quantity of slag of the present invention;
Fig. 7 reduces the converter process technology finishing slag MgO content of the quantity of slag and spatters slag time relation figure for the present invention is a kind of;
Fig. 8 is a kind of converter process technology convertor steelmaking process phosphorus content variation diagram that reduces the quantity of slag of the present invention;
Fig. 9 reduces the quantity of slag for the present invention is a kind of converter process technology lime and light dolomite consumption reduce scale map;
Figure 10 reduces the quantity of slag for the present invention is a kind of converter process technology tap improves scale map.
Embodiment
Experiment is carried out in 210 tons of top and bottom combined blown converters, and table 1 is for going into stove molten iron and steel scrap condition, and table 2 is the steelmaking ingredient condition, and table 3 spatters slag materials amount for the ton steel, and table 4 is the steelmaking process parameter.
SGRP technical process of the present invention as shown in Figure 1, this technical process is a cyclic process, starting point is decided to be slag splashing, terminal point is to stay slag in the stove; Solidify, add steel scrap, be blended into molten iron, stay eight stages of slag to form in blowing-dephosphorization stage fs, middle deslagging, subordinate phase blowing-decarburization stage, tapping and the stove by liquid slag in slag splashing, the stove.The slag that utilization is stayed in the stove carries out slag splashing, for new round-robin begins.Pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 30～50%, spatter the slag process and use at least a in rhombspar and the light dolomite as slag supplying agent, decarbonized slag residual behind the slag splashing is cured operation, and solidifying agent is a lime, adds steel scrap then and continues to solidify residual decarbonized slag; Carry out blowing-dephosphorization stage fs after being blended into molten iron, implement oxygen rifle oxygen-supply operation, be equipped with bottom blowing; In the middle deslagging stage, the MgO content after the control dephosphorization finishes in molten iron temperature, basicity and the dephosphorized slag is to guarantee the deslagging amount; In the decarburization stage, guarantee that the molten steel end phosphorus content is not more than 0.015%, control decarburization finishing slag MgO content 7.0～16%, protection converter lining and shortening slag splashing time.
Deslagging amount and subordinate phase (decarburization stage) finish to stay full slag cycle index time relation before the slag splashing as shown in Figure 2, the amount of pouring out is 30～50% can be under the prerequisite that satisfies the slag splashing requirement, this technical process circulation can reach 3～4 times, the amount of pouring out is lower than 30% and only can circulates and must pour out the part decarbonized slag after 2 times, and the amount of pouring out is higher than 50% can increase iron and steel stock consumption.
Make on the slag solidified basis at slag splashing, add about 4～10 kilograms of lime of ton steel, the steel scrap of packing into then continues slag at the bottom of the cool furnace, confirms completion of cure through range estimation, converts that the splash rate is zero in the iron process.
In the fs (dephosphorization stage), duration of blast is 4 minutes 10 seconds to 5 minutes and 1 second, and oxygen supply intensity is greater than 3.0Nm
3/ t/min, bottom blowing gas intensity are 0.048～0.16Nm
3/ t/min, fs terminal point bath temperature are controlled at 1355～1420 degree, and converting process is by adding the iron ore controlled temperature.Fig. 3 finishes the relation between back bath temperature and deslagging amount the fs (dephosphorization stage), one of gordian technique point of SGRP technology is the deslagging after finishing the fs (dephosphorization stage), and what of deslagging amount can determine to finish to stay entirely cycle index under the slag condition in subordinate phase (decarburization stage).From Fig. 3 as seen, because helping of high temperature slag and raising slag flowability, along with the rising deslagging amount increase of temperature, bath temperature is controlled at 1355～1420 degree can make the deslagging amount be stabilized in 5 tons promptly more than 40%.The relation of fs as shown in Figure 4 (dephosphorization stage) basicity and phosphor partition ratio (ratio in the slag between phosphorus content and metal phosphorus content), dephosphorization stage basicity is controlled at 1.1～2.5 requirements of all satisfying this technology, optimum range is 1.1～2.0, phosphorus content is not more than under 0.015% prerequisite in guaranteeing decarburization terminal point steel, reduces lime consumption to greatest extent.
Fs (dephosphorization) finishes the back and implements the deslagging operation, and the deslagging amount is 40～70%.Confirmed that by test smelting the last stove slag amount of pouring out of beginning be under 30～50% prerequisites, fs (dephosphorization stage) deslagging amount is lower than 40% and can causes this technical process only can circulate 2 times, not only prolong the production cycle, and caused the iron and steel stock waste.The deslagging amount can cause the production cycle to prolong greater than 70%.The slag condition can influence the deslagging amount equally, there is research (for example, CAMP-ISIJ, 18 (2005), p.913) reported dephosphorization temperature and basicity less than 2 condition under, basicity of slag and iron oxide content can be cancelled out each other to the influence of slag viscosity, and we can infer that MgO content has remarkably influenced to viscosity in the slag according to this conclusion.Fs as shown in Figure 5 (dephosphorization) finishes the relation between MgO content in back deslagging amount and the slag, and MgO content is lower than 8.0% and can satisfies the deslagging amount greater than 40% in the dephosphorized slag, considers the converter lining erosion problem, and MgO content is not less than 5.5% in the dephosphorized slag.Process dephosphorization rate as shown in Figure 6 changes, and has implemented the deslagging operation owing to reached 53.2% at average dephosphorization rate of dephosphorization stage, therefore needn't carry out high Basicity Operation in subordinate phase (decarburization stage).According to generation practice result of the present invention, even decarburization finishing slag basicity is controlled at 2.8～3.0, end phosphorus content is not more than 0.015% ratio and has reached 100%.In addition, low basicity helps reducing lime consumption and iron and steel stock consumption the decarburization stage.One of original creation point of the present invention is to stay slag operation entirely after decarburization finishes, and effectively utilizes the decarbonized slag that stays by slag splashing, but must consider the influence of decarbonized slag slag condition to the slag splashing effect.Decarburization stage finishing slag MgO content as shown in Figure 7 with spatter the slag time relation, according to generation practice result of the present invention, MgO content has remarkably influenced to spattering the slag time, finishing slag MgO content is controlled at 10.0～14.5% and can guarantees to spatter the slag time and be lower than 6 minutes.Decarburization finishing slag MgO content less than 7.0% condition under, visual observations is exposed to backup lining brick, illustrates lining erosion seriously, is higher than under 16% condition at MgO content, observes the converter top and has the metal splashings.
The invention provides a kind of new top and bottom combined blown converter steelmaking method, contrast conventional converter steelmaking process, be not more than under 0.015% prerequisite at end phosphorus content, lime and light dolomite consumption significantly reduce.As shown in Figure 8 convertor steelmaking process phosphorus content changes, and end phosphorus content is between 0.0073～0.0146%, and is average 0.0109%, and contrast is close to common process under the same terms, does not find big variation, satisfies being not more than 0.015% requirement fully.SGRP technology lime and light dolomite consumption reduce the statistics of ratio as shown in Figure 9, contrast is close to common process under the same terms, lime consumption has reduced by 40.5%, light dolomite consumption has reduced by 76.8%, the two wastage in bulk or weight has reduced by 55.5%, has demonstrated fully originality of the present invention.Except lime and light dolomite consumption, iron and steel stock consumption is controlled cost most important equally for steel mill, and the present invention has compared SGRP technology and common process tap, and as shown in figure 10, SGRP technology tap improves ratio average 1.42%.The present invention is a circulation technology, and the slag that process produces is not discharged as much as possible, and the result significantly reduces lime and light dolomite quantity discharged, and recovery rate of iron improves.
Table 1 is gone into stove molten iron and steel scrap condition
Table 2 steelmaking ingredient condition
| Project | CaO％ | MgO％ | SiO 2％ | S％ | Burning subtracts | Activity degree |
| Lime | 96.77 | 1.48 | 0.70 | 0.015 | 0.75 | 420 |
| Light dolomite | 51.66 | 38.15 | 1.13 | 0.030 | 8.28 | / |
| Unprocessed dolomite | 29.89 | 21.67 | 1.17 | / | / | / |
Table 3 a ton steel spatters slag stage materials amount, kilogram
Table 4 steelmaking process parameter
Claims (6)
1. converter process that reduces the quantity of slag, it is characterized in that: this technical process is a cyclic process, and starting point is decided to be slag splashing, terminal point is to stay slag in the stove; Solidified, add steel scrap, be blended into molten iron, stayed eight stages of slag to form in blowing-dephosphorization stage fs, middle deslagging, subordinate phase blowing-decarburization stage, tapping and the stove by liquid slag in slag splashing, the stove, specifically the technological operation step is as follows:
The slag that utilization is stayed in the stove carries out slag splashing, for new round-robin begins, pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 30～50%, spatter the slag process and use at least a in rhombspar and the light dolomite as slag supplying agent, decarbonized slag residual behind the slag splashing is cured operation, solidifying agent is a lime, adds steel scrap then and continues to solidify residual decarbonized slag; Carry out blowing-dephosphorization stage fs after being blended into molten iron, implement oxygen rifle oxygen-supply operation, be equipped with bottom blowing; In the middle deslagging stage, the MgO content after the control dephosphorization finishes in molten iron temperature, basicity and the dephosphorized slag is to guarantee the deslagging amount; In the decarburization stage, guarantee that the molten steel end phosphorus content is not more than 0.015%, control decarburization finishing slag MgO content 7.0～16%, protection converter lining and shortening slag splashing time.
2. a kind of converter process that reduces the quantity of slag as claimed in claim 1, it is characterized in that: slag splashing time requirement is not more than 6 minutes.
3. a kind of converter process that reduces the quantity of slag as claimed in claim 1, it is characterized in that: pour out the decarburization quantity of slag before the slag splashing and account for the quantity of slag 30～40% o'clock, this technical process can circulate 3 times, pours out the decarburization quantity of slag before the slag splashing and accounts for the quantity of slag 40～50% o'clock, and this technical process can circulate 4 times.
4. a kind of converter process that reduces the quantity of slag as claimed in claim 1 is characterized in that: behind slag splashing, add 4～10 kilograms of lime of ton steel, add steel scrap then, slag at the bottom of the lasting cool furnace further solidifies the interior liquid slag of stove.
5. a kind of converter process that reduces the quantity of slag as claimed in claim 1 is characterized in that: control oxygen supply intensity greater than 3.0Nm in the dephosphorization stage
3/ t/min, bottom blowing gas intensity are 0.048～0.16Nm
3/ t/min.
6. a kind of converter process that reduces the quantity of slag as claimed in claim 1, it is characterized in that: control dephosphorization terminal point bath temperature is at 1355～1420 ℃, dephosphorization stage basicity is controlled at 1.1～2.5, the MgO content requirement is 5.5～8.0% in the dephosphorized slag, and reaching dephosphorization end back deslagging amount is 40～70%.
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358912A (en) * | 2011-11-01 | 2012-02-22 | 北京科技大学 | Convertor smelting technology method for producing low-phosphorous steel |
| CN102534098A (en) * | 2012-03-01 | 2012-07-04 | 首钢总公司 | Method for raking slag during smelt process of converter to produce low-phosphorus steel |
| CN102643947A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Method for shorting slag-splashing converter protection time of converter |
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102965466A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
| CN102965465A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Method for curing converter slag |
| CN103060508A (en) * | 2013-01-17 | 2013-04-24 | 莱芜钢铁集团有限公司 | Smelting method for improving phosphorus removal rate of converter |
| CN103160637A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
| CN104017931A (en) * | 2014-06-26 | 2014-09-03 | 唐山国丰钢铁有限公司 | Final point slag retention operation method of dry-method dust collecting converter in low-carbon steel smelting |
| CN104060022A (en) * | 2013-09-09 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for steelmaking through adding limestone into converter remaining slag |
| CN104988270A (en) * | 2015-07-08 | 2015-10-21 | 南京钢铁股份有限公司 | Method for smelting pipeline steel with low cost |
| CN105177217A (en) * | 2015-08-20 | 2015-12-23 | 山东西王特钢有限公司 | Process for reducing steel slag quantity during converter smelting |
| CN105238906A (en) * | 2014-07-11 | 2016-01-13 | 鞍钢股份有限公司 | Low-carbon low-silicon steel smelting control method |
| 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 |
| CN106148632A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN107299184A (en) * | 2017-07-07 | 2017-10-27 | 首钢京唐钢铁联合有限责任公司 | A kind of dephosphorization converter bottom blowing air port maintaining method |
| CN107419051A (en) * | 2017-08-23 | 2017-12-01 | 华北理工大学 | Promote the smelting process of converter scrap melting using the dephosphorized slag that gasifies |
| CN107460271A (en) * | 2017-07-07 | 2017-12-12 | 首钢京唐钢铁联合有限责任公司 | A kind of method for safeguarding converter bottom |
| CN107794331A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of smelting process for reducing converter flux unit consumption |
| CN108699613A (en) * | 2016-07-27 | 2018-10-23 | 新日铁住金株式会社 | The manufacturing method of molten steel |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
| CN112226579A (en) * | 2020-09-07 | 2021-01-15 | 上海大学 | Method for promoting slagging of lime in dephosphorization period by converter steelmaking process with double-slag method |
| CN113817888A (en) * | 2021-08-18 | 2021-12-21 | 华北理工大学 | Optimized smelting method for converter slag remaining operation |
| CN113832289A (en) * | 2021-09-14 | 2021-12-24 | 包头钢铁（集团）有限责任公司 | Method for improving converter double-slag once-reversing dephosphorization rate |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358912A (en) * | 2011-11-01 | 2012-02-22 | 北京科技大学 | Convertor smelting technology method for producing low-phosphorous steel |
| CN102534098A (en) * | 2012-03-01 | 2012-07-04 | 首钢总公司 | Method for raking slag during smelt process of converter to produce low-phosphorus steel |
| CN102643947A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Method for shorting slag-splashing converter protection time of converter |
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102965466B (en) * | 2012-11-21 | 2014-04-02 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
| CN102965465A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Method for curing converter slag |
| CN102965466A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
| CN103060508A (en) * | 2013-01-17 | 2013-04-24 | 莱芜钢铁集团有限公司 | Smelting method for improving phosphorus removal rate of converter |
| CN103160637A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
| CN104060022A (en) * | 2013-09-09 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for steelmaking through adding limestone into converter remaining slag |
| CN104017931A (en) * | 2014-06-26 | 2014-09-03 | 唐山国丰钢铁有限公司 | Final point slag retention operation method of dry-method dust collecting converter in low-carbon steel smelting |
| CN105238906A (en) * | 2014-07-11 | 2016-01-13 | 鞍钢股份有限公司 | Low-carbon low-silicon steel smelting control method |
| CN105238906B (en) * | 2014-07-11 | 2017-07-21 | 鞍钢股份有限公司 | A kind of low-carbon low-silicon steel smelting control method |
| CN106148632B (en) * | 2015-03-28 | 2018-01-05 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN106148632A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN104988270A (en) * | 2015-07-08 | 2015-10-21 | 南京钢铁股份有限公司 | Method for smelting pipeline steel with low cost |
| CN105177217A (en) * | 2015-08-20 | 2015-12-23 | 山东西王特钢有限公司 | Process for reducing steel slag quantity during converter smelting |
| 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 |
| CN108699613A (en) * | 2016-07-27 | 2018-10-23 | 新日铁住金株式会社 | The manufacturing method of molten steel |
| CN107794331A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of smelting process for reducing converter flux unit consumption |
| CN107460271A (en) * | 2017-07-07 | 2017-12-12 | 首钢京唐钢铁联合有限责任公司 | A kind of method for safeguarding converter bottom |
| CN107299184A (en) * | 2017-07-07 | 2017-10-27 | 首钢京唐钢铁联合有限责任公司 | A kind of dephosphorization converter bottom blowing air port maintaining method |
| CN107419051A (en) * | 2017-08-23 | 2017-12-01 | 华北理工大学 | Promote the smelting process of converter scrap melting using the dephosphorized slag that gasifies |
| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
| CN112226579A (en) * | 2020-09-07 | 2021-01-15 | 上海大学 | Method for promoting slagging of lime in dephosphorization period by converter steelmaking process with double-slag method |
| CN113817888A (en) * | 2021-08-18 | 2021-12-21 | 华北理工大学 | Optimized smelting method for converter slag remaining operation |
| CN113832289A (en) * | 2021-09-14 | 2021-12-24 | 包头钢铁（集团）有限责任公司 | Method for improving converter double-slag once-reversing dephosphorization rate |
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