CN101403023A - Ultra-deep desulfuration method for hot metal - Google Patents
Ultra-deep desulfuration method for hot metal Download PDFInfo
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- CN101403023A CN101403023A CNA2008100797333A CN200810079733A CN101403023A CN 101403023 A CN101403023 A CN 101403023A CN A2008100797333 A CNA2008100797333 A CN A2008100797333A CN 200810079733 A CN200810079733 A CN 200810079733A CN 101403023 A CN101403023 A CN 101403023A
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Abstract
The invention relates to a hot metal ultra deep desulphurization method, a technological process thereof includes the following steps: hot metal is added into a hot metal ladle; a hot metal ladle car is moved to an injection position; injection parameters are set; injection is carried out; temperature is measured and sampling is carried out; the hot metal ladle car is moved to a slag skimming position; the car is tilted for slag skimming; slag is made; ultra deep desulphurization is carried out; craning the ladle; the technological parameters are as follows: the carrier gas pressure is 0.27 to 0.5MPa; the flow of injection gas is 50 to 75m<3> per hour; the magnesium supply strength is 4.0 to 7.0Kg/min; the injection time is 1 to 9min; temperature is measured and sampling is carried out under the temperature of 1240 to 1380 DEG C; the sulfur content of the hot metal is less than or equal to 0.005 percent; 8.0 to 10.0kg of ultra deep desulphurized slags of the hot metal is added into one ton of iron, with the injection time of 1 to 2min and the flow of the injection gas of 70 to 75m<3> per hour. The invention succeeds in reducing the final sulfur content of the hot metal to less than 0.002 percent by using the present desulphurization device and the methods of superficial desulphurization, slagging and ultra deep desulphurization, the proportion of the sulfur content of the hot metal being less than 0.001 percent reaches more than 95 percent and the average utilization ratio of granulated magnesium in the whole desulphurization is more than 55 percent.
Description
Technical field:
The invention belongs to a kind of blast-melted secondary desulfurization method of metallurgy industry.
Background technology:
The raising that steel performance is required along with people and the increase of ultralow-sulfur steel output, the control of sulphur and compound thereof more and more comes into one's own in the steel manufacture process.
Adopt at present the main device of metallic particles magnesium molten iron desulfuring to comprise: preprocessed molten iron jar, charger pan, winding-up jar, hot-metal ladle and carriage, gunjet rack, slag removal machine, slag pan, and automatic control equipment etc., carrier gas is a nitrogen.Its sulfur removal technology is: molten iron enters the station-mobile hot-metal ladle and carriage to winding-up position-setting injection parameter-winding-up-thermometric sampling-mobile hot-metal ladle and carriage skim to skimming-fascinating-bull ladle uses for converter.
Desulfurization is handled the back molten steel sulfur content and is controlled between 0.003%～0.005%.But along with the exploitation of ultralow-sulfur steel kind, as succeeding in developing of high-grade pipe line steel and high-level silicon steel, converter further improves the requirement of going into the stove molten steel sulfur content, requires converter molten steel sulfur content≤0.002%.
Application number is the patent application document of 02148516.x, in disclosed " desulfurizing iron method ", though there is equipment simple, easy to operate, the advantage that desulfurization rate is fast, final sweetening effectiveness is: sulphur content is 0.003%.
Summary of the invention:
The objective of the invention is to utilize existing sweetener, the sulfur method of the molten iron of sulphur content≤0.002% is provided.
Technical scheme of the present invention is: comprise shallow desulfurization, slag making, ultra-deep desulfuration, its technical process is: shallow desulfurization---slag making---ultra-deep desulfuration; The step of shallow desulfurization is: blast-melted enter iron ladle-with hot-metal ladle and carriage move to winding-up position-setting injection parameter-winding-up-thermometric sampling-mobile hot-metal ladle and carriage to skim-fascinate and skim, its parameter is: blast-melted temperature is at 1260～1400 ℃, sulphur content≤0.070%, after entering the desulfurizing iron treatment station, set shallow sulfur removal technology parameter, be that nebulizer gas pressure is 0.27Mpa～0.5Mpa, the blowing gas flow is 50～70m
3/ hour, be 6.0～7.0Kg/min for magnesium intensity, the winding-up time is 4～8min, the thermometric sampling, temperature is at 1240～1380 ℃, and molten steel sulfur content≤0.005% stops to handle, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞98% turns back to the desulfurizing iron station; The step that it is characterized in that slag making is: mobile hot-metal ladle and carriage is to winding-up position-adding molten iron ultra-deep desulfuration slag, and its parameter is: promptly add 8.0～10.0Kg/ ton iron, the winding-up time is 1～2min, and the blowing gas flow is 70～75m
3/ hour; The step of ultra-deep desulfuration is: set injection parameter-winding-up-thermometric sampling-mobile hot-metal ladle and carriage to skim-fascinate and skim-bull ladle; Its parameter is: nebulizer gas pressure is 0.27Mpa～0.5Mpa, and the blowing gas flow is 40～50m
3/ hour, be 4.0～5.0Kg/min for magnesium intensity, the winding-up time is 5～9min, stops to handle, the thermometric sampling, temperature is at 1230～1350 ℃, molten steel sulfur content≤0.002%, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞99%, preparation is blended into converter;
The preparation method of described molten iron ultra-deep desulfuration slag realizes by following step:
1, will make steel usefulness lime, steel-making usefulness the fluorite separated pulverizing and be filtered into granularity≤5mm, granularity is that 5～15mm, granularity are lime particle, the fluorite particle of three kinds of different sizes of 15～20mm;
2, with the lime particle of three kinds of different sizes, fluorite particle by following proportioning (weight percent) ginseng be made into the lime raw material, fluorite raw material: granularity≤5mm is 20%; Granularity is that 5～15mm is 70%; Granularity is that 15～20mm is 10%;
3, by following prescription (weight percent): lime raw material 60%; Fluorite raw material 30%; Industrial potassium titanate 10% mixes these three kinds of raw materials and promptly makes described ultra-deep desulfuration slag.Following table requires for the physics and chemistry of the lime (CaO) of steel-making usefulness:
Following table is the fluorite (CaF of steel-making usefulness
2) Chemical Composition require:
| CaF 2 | SiO 2 | P | S |
| ≥90 | ≤9.0 | ≤0.10 | ≤0.060 |
Industrial potassium titanate requires to meet national standard (GB/T1614-1999).
The present invention uses existing desulfurizer, three winding-ups (shallow desulfurization winding-up, slag making winding-up, ultra-deep desulfuration winding-up), a slag making (carrying out a slag making between shallow desulfurization and the ultra-deep desulfuration), (shallow desulphurization and slag skimming, the ultra-deep desulfuration are skimmed) technology of skimming for twice have been taked, the molten iron final sulfur content that makes of success is reduced to below 0.002%, the ratio of molten steel sulfur content≤0.001%＞95% wherein, the utilization ratio average out to of whole sweetening process particle magnesium is more than 55%.
The present invention also has following advantage:
1. the present invention has reduced the requirement of converter to the steel scrap sulphur content, has alleviated converter desulfurization burden simultaneously, has enlarged the ability of converter smelting ultralow-sulfur steel kind;
2. employing the present invention, the molten iron cooling is suitable with conventional desulfurizing iron cooling, but the utilization ratio of metallic particles magnesium has improved 4～5 percentage points than common process.
3. hot metal pretreatment adopts the present invention, whenever removes 1 kilogram of sulphur in the molten iron, and the molten iron ultra-deep desulfuration slag cost that deduction increases can reduce the hot metal pretreatment cost more than 46.03 yuan (by present calculation of price).
Embodiment:
Following examples be every jar of iron water amount between 65～80 tons, the case study on implementation under the sulphur content different condition.
Embodiment one: the iron water amount of present embodiment is 65 tons, and sulphur content≤0.036% blast-melted enters the shallow desulfurization of beginning behind the desulfurization station, after sulphur content≤0.005%, remove pre-slag, add the ultra-deep desulfuration slag, add-on is 520 kilograms, begins ultra-deep desulfuration then.After sulphur content≤0.002%, remove the top slag once more, prepare to be blended into converter.Whole sweetening process, the utilization ratio of particle magnesium reaches more than 55%, and the cost that deduction molten iron ultra-deep desulfuration slag increases whenever removes 1 kilogram of sulphur and can reduce cost 46.03 yuan.Concrete steps are as follows:
(1) shallow desulfurization: the blast-melted desulfurization station that enters of sulphur content≤0.040% sulphur content 0.036%, 1372 ℃ of thermometrics begin shallow desulfurization, and it is as follows to set shallow desulfurization injection parameter: nebulizer gas pressure is 0.3Mpa, and the blowing gas flow is 50m
3/ hour, be 6.0Kg/min for magnesium intensity, begin rifle winding-up down, the winding-up time is 4min, 1368 ℃ of thermometrics, the sampling analysis molten steel sulfur content is 0.0036%, stops to handle, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞98% turns back to the desulfurizing iron station.
(2) slag making: after shallow desulphurised hot metal removes top slag 98% in the iron ladle, add 520 kilograms of molten iron ultra-deep desulfuration slags, descend the rifle winding-up then, the fusing of promotion slag making materials, the winding-up time is 1min, the blowing gas flow is 70m
3/ hour, promote the fusing of initiate molten iron ultra-deep desulfuration slag.
(3) ultra-deep desulfuration: after the ultra-deep desulfuration slag fusing 90% that adds, the beginning ultra-deep desulfuration, it is as follows to set the ultra-deep desulfuration injection parameter: nebulizer gas pressure is 0.3Mpa, and the blowing gas flow is 40 hours, for magnesium intensity is 4.0Kg/min, the winding-up time is 8min, stops to handle 1347 ℃ of thermometrics, sampling analysis molten steel sulfur content≤0.0013%, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞99% prepares to be blended into converter.
Embodiment two: the iron water amount of present embodiment is 72 tons, and sulphur content is 0.052%, blast-meltedly enters the shallow desulfurization of beginning behind the desulfurization station, after sulphur content≤0.005%, removes pre-slag, adds 650 kilograms of ultra-deep desulfuration slags, begins ultra-deep desulfuration then.After sulphur content≤0.002%, remove the top slag once more, prepare to be blended into converter.Whole sweetening process, the utilization ratio of particle magnesium reaches more than 57%, and the cost that deduction molten iron ultra-deep desulfuration slag increases whenever removes 1 kilogram of sulphur and can reduce cost 60.06 yuan.Concrete steps are as follows:
(1) shallow desulfurization: sulphur content is at 0.40%～60% the blast-melted desulfurization station that enters, and 1345 ℃ of thermometrics begin shallow desulfurization, after begin shallow desulfurization, it is as follows to set shallow desulfurization injection parameter: nebulizer gas pressure 0.3Mpa, blowing gas flow are 60m
3/ hour, be 6.5Kg/min for magnesium intensity, begin rifle winding-up down, the winding-up time is 7min, 1338 ℃ of thermometrics, sampling analysis molten steel sulfur content≤0.0041% stops to handle, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞98% turns back to the desulfurizing iron station.
(2) slag making: after shallow desulphurised hot metal removes top slag 98% in the iron ladle, add molten iron ultra-deep desulfuration slag, add-on is 650 kilograms, descend the rifle winding-up then, the fusing of promotion slag making materials, and the winding-up time is 1 minute and 30 seconds, the blowing gas flow is 75m
3/ hour.Promote the fusing of initiate molten iron ultra-deep desulfuration slag.
(3) ultra-deep desulfuration: after the molten iron ultra-deep desulfuration slag fusing 90% that adds, the beginning ultra-deep desulfuration, it is as follows to set the ultra-deep desulfuration injection parameter: nebulizer gas pressure 0.3Mpa, blowing gas flow are 45m
3/ hour, be 4.5Kg/min for magnesium intensity, the winding-up time is 8min, stops to handle, 1326 ℃ of thermometrics, sampling analysis molten steel sulfur content≤0.0007%, skim in mobile hot-metal ladle and carriage to the station of skimming, and the rate of skimming＞99% prepares to be blended into converter.
Embodiment three: the iron water amount of present embodiment is 80 tons, and sulphur content＞0.072% blast-melted enters the shallow desulfurization of beginning behind the desulfurization station, after sulphur content≤0.005%, removes pre-slag, adds 800 kilograms of ultra-deep desulfuration slags, begins ultra-deep desulfuration then.After sulphur content≤0.002%, remove the top slag once more, prepare to be blended into converter.Whole sweetening process, the utilization ratio of particle magnesium reaches more than 57%, and the cost that deduction molten iron ultra-deep desulfuration slag increases whenever removes 1 kilogram of sulphur and can reduce cost 61.17 yuan.Concrete steps are as follows:
(1) shallow desulfurization: sulphur content is 0.072% the blast-melted desulfurization station that enters, and 1368 ℃ of thermometrics begin shallow desulfurization, and it is as follows to set shallow desulfurization injection parameter: nebulizer gas pressure 0.3Mpa, blowing gas flow are 70m
3/ hour, be 6.5Kg/min for magnesium intensity, begin rifle winding-up down, the winding-up time is 8min, 1360 ℃ of thermometrics, sampling analysis molten steel sulfur content≤0.0045% stops to handle, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞98% turns back to the desulfurizing iron station.
(2) slag making: after shallow desulphurised hot metal removes top slag 98% in the iron ladle, add molten iron ultra-deep desulfuration slag, add-on is 800 kilograms, descend the rifle winding-up then, the fusing of promotion slag making materials, and the winding-up time is 2min, the blowing gas flow is 70m
3/ hour.Promote the fusing of initiate molten iron ultra-deep desulfuration slag.
(3) ultra-deep desulfuration: after new top slag fusing 90%, the beginning ultra-deep desulfuration, it is as follows to set the ultra-deep desulfuration injection parameter: nebulizer gas pressure 0.3Mpa, blowing gas flow are 40m
3/ hour, be 4.5Kg/min for magnesium intensity, the winding-up time is 9min, stops to handle, and 1343 ℃ of thermometrics, sampling analysis molten steel sulfur content are 0.0007%, and skim in mobile hot-metal ladle and carriage to the station of skimming, and the rate of skimming＞99% prepares to be blended into converter.
Illustrate: the carrier gas of the various embodiments described above is a nitrogen;
The preparation method of the molten iron ultra-deep desulfuration slag of the various embodiments described above realizes by following step:
1, will make steel usefulness lime, steel-making usefulness the fluorite separated pulverizing and be filtered into granularity≤5mm, granularity is that 5～15mm, granularity are lime particle, the fluorite particle of three kinds of different sizes of 15～20mm;
2, with the lime particle of three kinds of different sizes, fluorite particle by following proportioning (weight percent) ginseng be made into the lime raw material, fluorite raw material: granularity≤5mm is 20%; Granularity is that 5～15mm is 70%; Granularity is that 15～20mm is 10%;
3, by following prescription (weight percent): lime raw material 60%; Fluorite raw material 30%; Industrial potassium titanate 10% mixes these three kinds of raw materials and promptly makes described ultra-deep desulfuration slag.
Above-mentioned ultra-deep desulfuration slag is stored in the airtight feed bin, is no more than two days working lipe.The storage feed bin should keep clean, drying, rainproof protection against the tide, in order to avoid rotten.
Following table is that the physics and chemistry of lime (CaO) of the steel-making usefulness of the various embodiments described above requires:
Following table is the fluorite (CaF of the steel-making usefulness of the various embodiments described above
2) Chemical Composition require:
| CaF 2 | SiO 2 | P | S |
| ≥90 | ≤9.0 | ≤0.10 | ≤0.060 |
The industrial potassium titanate of the various embodiments described above requires to meet national standard (GB/T1614-1999)
Top slag: together enter blast furnace slag in the iron ladle with molten iron when referring to blast furnace casting here;
Skim: be meant here after shallow desulfurization of molten iron or dark desulfurization, use the molten iron slag removal machine to take off the metallurgical slag (blast furnace slag or ultra-deep desulfuration slag) that floats in the iron ladle on the molten iron;
Following rifle winding-up: be meant here in the molten iron desulfuring spray gun insertion molten iron and jet;
Nebulizer gas pressure: when being meant nitrogen-blow here, the pressure of nitrogen pipeline;
Supply magnesium intensity: desulfurization metal particle magnesium enters the amount in the molten iron in the unit time;
Gas flow: nitrogen is measured by pipeline (or the amount that enters molten iron) in the unit time;
The thermometric sampling: the thermometric sampling is two operations, and thermometric is meant by temperature-measuring gun measures molten iron temperature, and sampling is meant by sampler carries out sampling analysis to molten iron;
Desulfurization slag: be meant a kind of mixing powder that is specifically designed to desulfurizing iron here, its major ingredient is based on calcium oxide and fluorite;
Slag making: in metallurgical process, add materials such as solid-state calcium oxide and fluorite, form a kind of high-temperature liquid state material through mix the back with pyrotic smelting, objectionable impurities (as: phosphorus, sulphur, oxide compound etc.) in the process that forms the high-temperature liquid state material in absorption molten iron or the molten steel, and the contacting of isolated molten iron or molten steel and air, molten iron or molten steel are incubated, and these processes are called slag making altogether.
Claims (2)
1, a kind of ultra-deep desulfuration method for hot metal comprises shallow desulfurization, slag making, ultra-deep desulfuration, and its technical process is: shallow desulfurization---slag making---ultra-deep desulfuration; The step of shallow desulfurization is: blast-melted enter iron ladle-with hot-metal ladle and carriage move to winding-up position-setting injection parameter-winding-up-thermometric sampling-mobile hot-metal ladle and carriage to skim-fascinate and skim, its parameter is: blast-melted temperature is at 1260～1400 ℃, sulphur content≤0.070%, after entering the desulfurizing iron treatment station, set shallow sulfur removal technology parameter, be that nebulizer gas pressure is 0.27～0.5Mpa, the blowing gas flow is 50～70m
3/ hour, be 6.0～7.0Kg/min for magnesium intensity, the winding-up time is 4～8min, the thermometric sampling, temperature is at 1240～1380 ℃, and molten steel sulfur content≤0.005% stops to handle, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞98% turns back to the desulfurizing iron station; The step that it is characterized in that slag making is: mobile hot-metal ladle and carriage is to winding-up position-adding molten iron ultra-deep desulfuration slag, and its parameter is: promptly add molten iron ultra-deep desulfuration slag 8.0～10.0Kg/ ton iron, the winding-up time is 1～2min, and the blowing gas flow is 70～75m
3/ hour; The step of ultra-deep desulfuration is: set injection parameter-winding-up-thermometric sampling-mobile hot-metal ladle and carriage to skim-fascinate and skim-bull ladle; Its parameter is: nebulizer gas pressure is 0.27～0.5Mpa, and the blowing gas flow is 40～50m
3/ hour, be 4.0～5.0Kg/min for magnesium intensity, the winding-up time is 5～9min, stops to handle, the thermometric sampling, temperature is at 1230～1350 ℃, molten steel sulfur content≤0.002%, skim in mobile hot-metal ladle and carriage to the station of skimming, the rate of skimming＞99%, preparation is blended into converter;
2, a kind of ultra-deep desulfuration method for hot metal according to claim 1 is characterized in that the preparation method of described molten iron ultra-deep desulfuration slag realizes by following step:
I, will make steel usefulness lime, steel-making usefulness the fluorite separated pulverizing and be filtered into granularity≤5mm, granularity is that 5～15mm, granularity are lime particle, the fluorite particle of three kinds of different sizes of 15～20mm;
Ii, with the lime particle of three kinds of different sizes, fluorite particle by following proportioning (weight percent) ginseng be made into the lime raw material, fluorite raw material: granularity≤5mm is 20%; Granularity is that 5～15mm is 70%; Granularity is that 15～20mm is 10%;
Iii, by following prescription (weight percent): lime raw material 60%; Fluorite raw material 30%; Industrial potassium titanate 10% mixes these three kinds of raw materials and promptly makes described ultra-deep desulfuration slag.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114175A (en) * | 2013-03-19 | 2013-05-22 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN103266189A (en) * | 2013-05-29 | 2013-08-28 | 新兴铸管股份有限公司 | Method for judging sulfur content of molten iron of blast furnace |
| CN105385809A (en) * | 2015-10-23 | 2016-03-09 | 首钢总公司 | Desulfurizing method for molten iron containing sulfur |
| CN105777330A (en) * | 2016-02-22 | 2016-07-20 | 新疆中合大正商贸有限公司 | Technology for producing silicon fertilizer by means of blowing desulfurization slag |
| CN107287385A (en) * | 2016-03-31 | 2017-10-24 | 上海梅山钢铁股份有限公司 | Molten iron drossing stays calculating and the control method of slag ratio example |
| CN110484684A (en) * | 2019-09-12 | 2019-11-22 | 北京首钢股份有限公司 | A kind of molten steel pocket deslagging method |
| CN111471833A (en) * | 2020-05-27 | 2020-07-31 | 济南银城铸造厂 | Desulfurization pretreatment process for molten iron for casting |
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- 2008-11-06 CN CNA2008100797333A patent/CN101403023A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114175A (en) * | 2013-03-19 | 2013-05-22 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN103114175B (en) * | 2013-03-19 | 2015-02-25 | 武汉钢铁(集团)公司 | Deep desulfuration method for magnesium-based composite jetted molten iron |
| CN103266189A (en) * | 2013-05-29 | 2013-08-28 | 新兴铸管股份有限公司 | Method for judging sulfur content of molten iron of blast furnace |
| CN103266189B (en) * | 2013-05-29 | 2015-10-21 | 新兴铸管股份有限公司 | Judge the method for blast-melted sulfur-bearing composition |
| CN105385809A (en) * | 2015-10-23 | 2016-03-09 | 首钢总公司 | Desulfurizing method for molten iron containing sulfur |
| CN105777330A (en) * | 2016-02-22 | 2016-07-20 | 新疆中合大正商贸有限公司 | Technology for producing silicon fertilizer by means of blowing desulfurization slag |
| CN105777330B (en) * | 2016-02-22 | 2021-02-23 | 新疆中合大正冶金科技有限公司 | Process for producing silicon fertilizer by using blowing desulfurization slag |
| CN107287385A (en) * | 2016-03-31 | 2017-10-24 | 上海梅山钢铁股份有限公司 | Molten iron drossing stays calculating and the control method of slag ratio example |
| CN107287385B (en) * | 2016-03-31 | 2019-04-16 | 上海梅山钢铁股份有限公司 | Molten iron drossing stays the calculating and control method of slag ratio example |
| CN110484684A (en) * | 2019-09-12 | 2019-11-22 | 北京首钢股份有限公司 | A kind of molten steel pocket deslagging method |
| CN110484684B (en) * | 2019-09-12 | 2021-05-28 | 北京首钢股份有限公司 | Ladle slag skimming method |
| CN111471833A (en) * | 2020-05-27 | 2020-07-31 | 济南银城铸造厂 | Desulfurization pretreatment process for molten iron for casting |
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