CN105274272A - Compound jetting molten iron desulphurization material and adjusting device thereof - Google Patents
Compound jetting molten iron desulphurization material and adjusting device thereof Download PDFInfo
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- CN105274272A CN105274272A CN201510868957.2A CN201510868957A CN105274272A CN 105274272 A CN105274272 A CN 105274272A CN 201510868957 A CN201510868957 A CN 201510868957A CN 105274272 A CN105274272 A CN 105274272A
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- magnesium powder
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- iron material
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Abstract
The invention relates to a compound jetting molten iron desulphurization material and an adjusting device thereof. The compound jetting molten iron desulphurization material comprises the following components in parts by weight: 3.7-4.5 parts of lime and 1 part of magnesium powder. The adjusting device for the compound jetting molten iron desulphurization material comprises a lime pipeline and a magnesium powder pipeline, wherein the diameter of the lower end of a lime pipeline pore plate is 9-10mm and the diameter of the lower end of a magnesium powder pipeline pore plate is 12-13mm. The excellent effects of high magnesium powder sulphur removal efficiency, short time, little splashing, less iron loss and temperature loss and low cost during the compound jetting desulphurization process are achieved.
Description
Technical field
The present invention relates to lime and magnesium powder optimal proportion technology and setting device in desulfurizing iron, be specifically related to a kind of composite blowing desulfurizing iron material and setting device thereof.
Background technology
Composite blowing is that lime adds magnesium powder and carries out one of effective ways of desulfurizing iron, the fusing point of MAGNESIUM METAL is: 651 DEG C, boiling point is 1110 DEG C, because dissolved magnesium under high temperature and gaseous magnesium and Sulfur Content in Hot Iron have very strong avidity, the thermodynamic condition of its desulphurization reaction and dynamic conditions very well, are strong sweetening agents; Fluidization lime mainly plays as carrier the effect that magnesium powder diffuses agent, a large amount of magnesium instant vaporization is avoided to cause splash, suitably reduce the speed of response of magnesium powder in molten bath simultaneously, lime can also become a large amount of bubble formation core, thus reduce magnesium bubble diameter, reduce magnesium gas bubble light soil, accelerate magnesium to the diffusion in molten iron, improve the utilization ratio of magnesium.
In composite blowing, how rational proportion determines the effect most critical factors such as desulfurization degree, winding-up time, splash size, iron loss and temperature drop for lime and magnesium powder; If lime and magnesium powder proportioning is too small will produce the unit time to spray into magnesium powder amount many, a large amount of magnesium instant vaporization volume sharply exapnsion and local magnesium and the dual superposition of sulphur generation intense reaction cause produce molten iron seethe and cause a large amount of splash, molten iron and temperature loss but also the equipment that can burn out not only can be caused even to produce personal injury accident, and simultaneously a part of magnesium bubble can lack lime and relies on and form core and direct boiling and float and enter air and reduce magnesium service efficiency; Lime and magnesium powder proportioning is excessive will produce the unit time to spray into magnesium powder amount few, desulfurization rate time of jetting slowly is long, desulfuration efficiency is low can not meet rhythm of production needs, spray into amount of lime large and winding-up time longly also can reduce molten iron temperature and increase iron loss in molten iron slag simultaneously, and tank is serious, converter Intake Quantity is not enough, smelt the problems such as difficult to cause molten iron to glue;
Horse steel first steel roll head factory former to lime in composite blowing desulfurizing iron and magnesium powder proportioning understanding of importance deficiency study not dark, original adoption is valve operation manually, because manually-operated gate quick abrasion, spoilage are high, in addition sharpness of regulation is poor and unstable, be difficult to effectively accurately find stability contorting lime and magnesium powder rational proportion, cause composite blowing sweetening process to there is the following problems such as sweetening effectiveness instability, iron loss is large, cost is high:
1) desulfurization hit rate is low, and effect is unstable, fluctuates large 83% ~ 95%.
2) lime and the too small molten iron splash severe temperature that easily causes of magnesium powder proportioning lose greatly, and can reach more than 20kg/ ton iron, magnesium powder consumption is also high; Proportioning is excessive, also causes desulfurization time length can not meet rhythm of production needs, and after winding-up, the molten iron quantity of slag to cause greatly in slag the large and temperature loss more than 25 DEG C of iron loss.
3) the normal desulfurization of the many impacts of accident is produced, every year because desulfurization reason causes production interruption 7 ~ 10 times.
4) valve spoilage is high, and work-ing life is low, changes frequent, increases labour intensity.
5) bosom equipment is seriously easily burnt in splash has every year 3 ~ 4 times and there is certain potential safety hazard.
In application composite blowing desulfurizing iron, binomial gordian technique is developed for the problems referred to above our factory:
1. study lime and magnesium powder how rational proportion technology, realize the effects such as magnesium powder desulfuration efficiency is high and stable, splash is little, time short temperature loss is little, iron loss is low.
2., in test lime and magnesium powder rational proportion process, invention uses perforated plate pneumatic control valve gate technique.
Summary of the invention
The object of the present invention is to provide a kind of composite blowing desulfurizing iron material and setting device thereof, realize in composite blowing sweetening process, magnesium powder desulfuration efficiency is high, the time is short, splash is little, iron loss and temperature loss is few, cost is low good result, sum up lime and magnesium powder rational proportion technical parameter under existence conditions through a large amount of practical studies, invented a kind of practicality simple to operate simultaneously and regulated lime and magnesium powder matching device.Concrete technical scheme is as follows:
A kind of composite blowing desulfurizing iron material, comprises the lime of 3.7-4.5 part by weight ratio, and the magnesium powder of 1 part.
Further, described lime is fluidization lime.
Further, according to weight percent CaO >=90 in described fluidization lime, MgO < 1.0, SiO2 < 1.0, full sulphur≤0.025, CO2 < 0.5, IL≤3.0.
Further, described fluidization lime size indicator is 100%≤0.9mm, 99%≤0.45mm, 98%≤0.18mm, 95%≤0.09mm, 88%≤0.045mm.
Further, described magnesium powder is for spray deactivating magnesium powder again.
Further, spraying deactivating magnesium powder physical and chemical index is again according to Mg content >=90.0% after weight percent passivation, full sulfur content≤0.002%, 1000 DEG C of duration of fire resistance ≯ 24 second.
Further, magnesium Powder Particle Size 100% < 0.85mm, magnesium powder >=80.0% of 0.3 ~ 0.6mm.
The setting device of above-mentioned composite blowing desulfurizing iron material, comprises lime pipeline and magnesium powder pipeline, and wherein, lime lower end of duct orifice plate diameter is 9 ~ 10mm, and magnesium powder pipeline orifice plate lower end diameter is 12 ~ 13mm.
Further, described lime lower end of duct orifice plate is arranged in lime pipeline in automatic pneumatic by-pass valve control, and described magnesium powder pipeline orifice plate to be arranged in magnesium powder pipeline in automatic pneumatic by-pass valve control.
Annual our factory will meet the low-sulphur steel needs such as silicon steel, want composite blowing desulphurised hot metal amount about 430,000 tons, every tank molten iron 130 tons, the original sulphur of major part molten iron takes off to molten iron terminal [S]≤0.002% between 0.030 ~ 0.040%, and three kinds of different lime and magnesium powder proportioning sulfur removal technology cost compare (unit/t iron) are as shown:
Lime and magnesium powder proportioning are respectively 3.2:1,6.8:1,4.3:1 by time too small, excessive, moderate;
Core loss value is respectively 2.9 tons/130 tons=22.31kg/t iron, 2.7 tons/130 tons=20.76kg/t, 2.2 tons/130 tons=16.92kg/t,
Existing magnesium powder price 16000 yuan/t; Fluidization lime 1200 yuan/t, molten iron 2400 yuan/t; Temperature drop is by 0.2 yuan of/DEG C of calculating;
1: be 427856 tons in fact by composite blowing desulfurizing iron amount in 2014, ten thousand yuan can be reached more than 6,520,000 yuan and 600 than too small, excessive bringing benefits when lime is moderate with magnesium powder.
428726 tons of iron water amount × (71.41-56.19)=6525209.7 yuan
428726 tons of iron water amount × (70.20-56.19)=6006451.2 yuan
2) accident is few, and annual control is less than less than 2 times, ensures that normal desulfurization is produced, and after implementing time item technology, the equipment of not burning out and security incident, orifice plate long service life can reach the several years more than, reliably durable, reduces labour intensity.
Accompanying drawing explanation
Fig. 1 is manually-operated gate adjustment before transformation
Fig. 2 is perforated plate operated pneumatic valve adjustment after transformation
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, require as follows to fluidised form fossil ash and magnesium meal component,
Fluidization lime index:
Fluidization lime size indicator:
Spray deactivating magnesium powder physical and chemical index again:
Magnesium Powder Particle Size
Through test of many times research, a kind of special wear-resisting orifice fitting structure of invention is as accompanying drawing, orifice plate upper end hole diameter is fixed as 30mm, main consideration opening close to tube wall to reduce gas-flow resistance, lower stomidium has different diameter to play adjustment metering function, lower end bore dia has 7 respectively, 8,9,10,11,12,13, the different size such as 14mm, actual being arranged in pneumatic control ball valve when using realizes lime and magnesium powder proportioning regulates, on screening various combination experimental feasibility basis, when determining to use lime pipeline aperture plate lower end diameter to be less than magnesium powder pipeline aperture plate lower end diameter, the basic direct motion of winding-up process, further optimization Test again, specifically select lime lower end different from magnesium powder pipeline orifice plate diameter to combine pairing respectively and carry out thousands of tank time desulfurization test Data Comparison, sum up and find that lime and magnesium powder proportioning are at 3.7 ~ 4.5:1, in blowing desulfurization process, magnesium powder consumes low, the little sweetening effectiveness that waits of the few temperature loss of the low iron loss of time short splash is good, diameter 9 ~ the 10mm of corresponding lime orifice plate lower end employing and the diameter 12 ~ 13mm of magnesium powder orifice plate lower end employing combines at that time, reach lime and magnesium powder rational proportion, realize good sweetening effectiveness.
1) magnesium powder desulfuration efficiency is high and stable,
2) splash of blowing desulfurization process time molten iron is little, iron loss and temperature loss few, the time, short and small 12min met need of production, the low good result of cost,
3) accident is few, and annual control is less than less than 2 times, ensures that normal desulfurization is produced, as long as change of external conditions is little, the combination of optional holes board diameter does not just need to change.
4) long service life can reach the several years more than, reliably durable, simple to operate.
In a preferred embodiment, first adopt different orifice plate lower end diameter to match respectively at lime and magnesium powder pipeline and carry out thousands of tank time desulfurization test data, contrast from the aspect such as desulfurization hit rate, the consumption of lime magnesium powder, splash iron loss, temperature drop, show that lime and magnesium powder proportioning are between 3.7-4.5:1, magnesium powder desulfuration efficiency in composite blowing sweetening process can be realized high, time is short, and splash is little, iron loss and the few minimum good result of cost of temperature loss.
Secondly according to above-mentioned lime and magnesium powder rational proportion test-results, finally determine lime lower end of duct orifice plate diameter and adopt 9 ~ 10mm and magnesium powder pipeline orifice plate lower end diameter to adopt 12 ~ 13mm proportioning the most reasonable, best sweetening effectiveness can be reached.
Finally the different orifice plate diameters of the above-mentioned reasonable set determined to be arranged on respectively in lime and magnesium powder pipeline in automatic pneumatic by-pass valve control, by manually-operated gate standard-sized sheet before winding-up, automatically pneumatic control valve is opened by the sequence of control of setting during winding-up, lime and magnesium powder winding-up amount is controlled respectively, to realize lime and magnesium powder optimum proportioning reaches best sweetening effectiveness by different orifice plate lower end diameter.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or directly apply to other occasion, all within protection scope of the present invention without improving.
Claims (9)
1. a composite blowing desulfurizing iron material, is characterized in that, comprises the lime of 3.7-4.5 part by weight ratio, and the magnesium powder of 1 part.
2. composite blowing desulfurizing iron material as claimed in claim 1, it is characterized in that, described lime is fluidization lime.
3. composite blowing desulfurizing iron material as claimed in claim 2, it is characterized in that, according to weight percent CaO >=90 in described fluidization lime, MgO < 1.0, SiO2 < 1.0, full sulphur≤0.025, CO2 < 0.5, IL≤3.0.
4. composite blowing desulfurizing iron material as claimed in claim 2 or claim 3, it is characterized in that, described fluidization lime size indicator is 100%≤0.9mm, 99%≤0.45mm, 98%≤0.18mm, 95%≤0.09mm, 88%≤0.045mm.
5. the composite blowing desulfurizing iron material as described in claim 1-4, is characterized in that, described magnesium powder is for spray deactivating magnesium powder again.
6. composite blowing desulfurizing iron material as claimed in claim 5, is characterized in that, spraying deactivating magnesium powder physical and chemical index is again according to Mg content >=90.0% after weight percent passivation, full sulfur content≤0.002%, 1000 DEG C of duration of fire resistance ≯ 24 second.
7. the composite blowing desulfurizing iron material as described in claim 5 or 6, is characterized in that, magnesium Powder Particle Size 100% < 0.85mm, magnesium powder >=80.0% of 0.3 ~ 0.6mm.
8. the setting device of the composite blowing desulfurizing iron material as described in claim 1-7, is characterized in that, comprises lime pipeline and magnesium powder pipeline, and wherein, lime lower end of duct orifice plate diameter is 9 ~ 10mm, and magnesium powder pipeline orifice plate lower end diameter is 12 ~ 13mm.
9. the setting device of composite blowing desulfurizing iron material as claimed in claim 8, it is characterized in that, described lime lower end of duct orifice plate is arranged in lime pipeline in automatic pneumatic by-pass valve control, and described magnesium powder pipeline orifice plate to be arranged in magnesium powder pipeline in automatic pneumatic by-pass valve control.
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| CN201510868957.2A CN105274272A (en) | 2015-11-27 | 2015-11-27 | Compound jetting molten iron desulphurization material and adjusting device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108359770A (en) * | 2018-04-13 | 2018-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurizing agent for composite blowing desulfurization and its application |
| CN108359771A (en) * | 2018-05-23 | 2018-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurizing agent and sulfur method for composite blowing desulfurization |
| TWI660049B (en) * | 2017-01-19 | 2019-05-21 | 日商杰富意鋼鐵股份有限公司 | Desulfurization treatment method for molten steel and desulfurizing agent |
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| CN102912084A (en) * | 2012-11-07 | 2013-02-06 | 武汉钢铁(集团)公司 | Molten iron desulfurization method |
| CN104561445A (en) * | 2014-12-12 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Modifying treatment method of blowing desulfurization slag |
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- 2015-11-27 CN CN201510868957.2A patent/CN105274272A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102912084A (en) * | 2012-11-07 | 2013-02-06 | 武汉钢铁(集团)公司 | Molten iron desulfurization method |
| CN104561445A (en) * | 2014-12-12 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Modifying treatment method of blowing desulfurization slag |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI660049B (en) * | 2017-01-19 | 2019-05-21 | 日商杰富意鋼鐵股份有限公司 | Desulfurization treatment method for molten steel and desulfurizing agent |
| CN108359770A (en) * | 2018-04-13 | 2018-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurizing agent for composite blowing desulfurization and its application |
| CN108359771A (en) * | 2018-05-23 | 2018-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurizing agent and sulfur method for composite blowing desulfurization |
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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Hunan Anhui West Road, No. 8 technology center, Intellectual Property Department Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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Application publication date: 20160127 |
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