CN1054267A - A kind of cupola furnace (cupola furnace) sulfur removal technology - Google Patents
A kind of cupola furnace (cupola furnace) sulfur removal technology Download PDFInfo
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- CN1054267A CN1054267A CN 90100927 CN90100927A CN1054267A CN 1054267 A CN1054267 A CN 1054267A CN 90100927 CN90100927 CN 90100927 CN 90100927 A CN90100927 A CN 90100927A CN 1054267 A CN1054267 A CN 1054267A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a kind of cupola furnace (cupola furnace) sulfur removal technology, particularly alkalify iron furnace (cupola furnace) adopts solid lime furnace inner desulfurization technology.Purpose is to solve problems such as desulfurizing iron difficulty, sulfur content of hot metal height in the prior art, satisfies needs metallurgical, casting industry.Technical scheme is: cupola furnace (cupola furnace) crossed the space of the torrid zone and cupola well band and abandoned and fill out with coke, lime mixing, realizes the high-temp solid lime desulfurization and strengthens slag desulfurization.Adopt the hard bulk lime that burns to make sweetening agent, strengthen the sweetening effectiveness of lime.The present invention has characteristics such as technology is reasonable, desulfuration efficiency is high, reduction sulfur content of hot metal.
Description
The present invention relates to a kind of cupola furnace (cupola furnace) sulfur removal technology, particularly alkalify iron furnace (cupola furnace) adopts solid lime furnace inner desulfurization technology.
The cupola furnace also claims cupola furnace, is equipment metallurgical, casting industry melting molten iron, and before blow-on, the space that cupola furnace (cupola furnace) crosses the torrid zone and cupola well band is full of coke.At present, the sulfur removal technology of alkalify iron furnace (cupola furnace) is to add little lump lime or lime masonry slag former, forms slag near melting zone, generates CaS by CaO in the slag and the S effect in the molten iron, reaches the purpose of desulfurization.For the ease of the roasting of Wingdale and the fusing slagging of lime, metallurgical department recommends to use little lump lime and Wingdale, and the Wingdale lumpiness is 10～50mm, and the lumpiness of lime is 20～80mm.For example: metallurgical industry press 1972 publish " steel-making design reference handbook is exactly Wingdale and a lime of recommending above-mentioned lumpiness to the cupola furnace for the 153rd page.The Wingdale lumpiness of regulation use is 20～60mm in the national sector standard " casting cupola furnace with Wingdale (JB/Z72-64) "; Regulation ironmaking is 15～70mm with the Wingdale lumpiness in the standard " Wingdale (YB2403-79) ".The lime or the Wingdale lumpiness and above-mentioned basic identical of each factory's practical application of the whole nation promptly adopt little lump lime or lime masonry sweetening agent.The main drawback of this sulfur removal technology is: when slagging, CaO at first with coke ash in SiO
2In conjunction with, generate stable silicate, reduced the activity of CaO, enable greatly to reduce with S " the free CaO " that generates CaS that chemically react, " free CaO " is just very little with the chance of S collision, and therefore, alkalify iron furnace (cupola furnace) desulfuration efficiency is all very low both at home and abroad, generally can only remove coke increase into sulphur, make molten iron sulfur-bearing and pig iron sulfur-bearing basic identical.External cupola furnace of using high basicity slag also is difficult to sulfur content of hot metal is reduced to below 0.02%.
The object of the invention provides a kind of cupola furnace (cupola furnace) sulfur removal technology, solves problems such as desulfurizing iron difficulty, sulfur content of hot metal height in the prior art, reduces the sulphur content of molten iron, satisfies needs metallurgical, casting industry.
The objective of the invention is to realize by following technical proposal:
The space that cupola furnace in the prior art (cupola furnace) crossed the torrid zone and cupola well band all is full of coke and changes into coke, lime mixed filling, realizes high-temp solid lime desulfurization and reinforcement slag desulfurization.
Can also adopt hard burning bulk lime to make sweetening agent simultaneously, strengthen the sweetening effectiveness of lime.Said " bulk lime " is meant that lumpiness is the above lime of 100mm; Said " hard calcined lime " is meant the lime of grilling thoroughly (not containing the living heart).
Adopt the present invention, cupola furnace (cupola furnace) crossed the torrid zone and the space coke of cupola well band and the volume ratio of lime and is: coke 50～95%, lime 5～50%.The ratio of lime and coke can be adjusted as required, and because of the coke proportion is little, the carbon content of molten iron is also corresponding lower; If the molten iron carbon content is low excessively, the fusing point of molten iron raises, and is unfavorable for the next procedure operation.
With batch of material go into stove, the hard burning bulk lime lumpiness used as sweetening agent is 100～400mm.
The principle that the present invention improves cupola furnace (cupola furnace) desulfuration efficiency is: increased the effect of solid lime desulfurization.When opening new furnace, the space of crossing the torrid zone and cupola well band is by coke and lime mixed filling, and go into stove with hard burning bulk lime with batch of material and make sweetening agent, near the hard slagging district of bulk lime melting zone of burning only melts away one deck, all the other major parts are displaced downwardly to bed coke with the state of blocks of solid lime, the continuous consumption that replenishes solid lime in bed coke and the cupola well, assurance cupola furnace (cupola furnace) are crossed the space of the torrid zone and cupola well band all the time by coke and lime mixed filling.When melting is carried out, the molten iron that is formed by melting zone drips, in the process of passing bed coke and cupola well, constantly contact pyritous blocks of solid lime (drop on the lime or from lime and flow through) drips owing to the pig iron is fused into molten iron, and dispersity is very big, the space of crossing the torrid zone and cupola well band is by coke and lime mixed filling, and constantly burnt replenishing of bulk lime firmly, the probability that high-temp solid lime is contacted with molten iron improves greatly, thereby following chemical reaction takes place:
Reach reinforcing desulfuration, improve the desulfuration efficiency purpose.
The present invention has characteristics such as technology is reasonable, desulfuration efficiency is high, reduction sulfur content of hot metal.
Further specify the present invention by the following examples.
The present invention 12 tons/time alkalify iron furnace on embodiment.
This stove molten iron is for oxygen top blown converter steel making, and raw material is the miscellaneous high-sulfur pig iron, and spot-check its high-sulfur iron, to contain flow be 0.147%, 0.155%, 0.170%, 0.250%; The metal charge sulphur content is estimated and is joined 0.13～0.15%; Coke ash 14～17%; Fluorite contains CaF
288.4%.When this specific admixture high-sulfur iron of past adopts prior art to produce, molten iron sulfur-bearing height (being generally 0.08～0.20%), most applications is that the cupola furnace increases sulphur, such molten iron is difficult to satisfy the requirement of STEELMAKING PRODUCTION.
Adopt the present invention, during new blow-on, the space that the torrid zone and cupola well band are crossed in the cupola furnace is made sweetening agent by coke and lime mixed filling by a certain percentage with hard burning bulk lime.
Embodiment 1
When blow-on, the cupola furnace cross the torrid zone and the space of cupola well band by coke and lime by certain volume ratio mixed filling, coke 95%, lime 5%; Add the hard bulk lime that burns with batch of material and make sweetening agent, the lumpiness of burning bulk lime firmly is 100～400mm.By sampling analysis, the scope of molten iron S is 0.015～0.033%, and mean value is 0.022%; Molten iron Si mean value is 1.01%.
Embodiment 2
When blow-on, the cupola furnace cross the torrid zone and the space of cupola well band by coke and lime by certain volume ratio mixed filling, coke 70%, lime 30%; Add the hard bulk lime that burns with batch of material and make sweetening agent, replenished the lime consumption of the torrid zone and cupola well band, the size range of burning bulk lime firmly is 150～350mm.By sampling analysis, the scope of the molten iron S that produces is 0.004～0.0035%, and the mean value of S is 0.012%, and molten iron Si mean value is 0.95%.
Embodiment 3
When blow-on, the cupola furnace cross the torrid zone and the space of cupola well band by coke and lime by certain volume ratio mixed filling, coke 50%, lime 50%; Add the hard bulk lime that burns with batch of material and make sweetening agent, the size range of burning bulk lime firmly is 150～300mm.By sampling analysis, the scope of the molten iron S that produces is 0.010～0.016%, and the mean value of S is 0.012%, and molten iron Si mean value is 0.97%.
Show that by embodiment the present invention can dissolve with high-sulfur iron and contain the extremely low molten iron of stream, desulfurization degree reaches 88%, and the molten iron of producing all reaches country-level molten iron standard.
Claims (4)
1, the sulfur removal technology of a kind of cupola furnace (cupola furnace) adopts solid lime to carry out desulfurization, and the space that it is characterized in that the mistake torrid zone, cupola furnace (cupola furnace) and cupola well band is by coke and lime mixed filling.
2, cupola furnace (cupola furnace) sulfur removal technology according to claim 1, it is characterized in that adopting lumpiness is that the above hard burning bulk lime of 100mm is made sweetening agent, goes into stove with batch of material.
3,, it is characterized in that the space coke of the torrid zone and cupola well band is crossed in cupola furnace (cupola furnace) and the volume ratio of lime is: coke 50～95%, lime 5～50% according to claim 1 or 2 described cupola furnace (cupola furnace) sulfur removal technologies.
4, cupola furnace (cupola furnace) sulfur removal technology according to claim 2, the size range that it is characterized in that said hard burning bulk lime is 100～500mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100927 CN1022574C (en) | 1990-02-22 | 1990-02-22 | Dusulfurization process for cupola furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100927 CN1022574C (en) | 1990-02-22 | 1990-02-22 | Dusulfurization process for cupola furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1054267A true CN1054267A (en) | 1991-09-04 |
| CN1022574C CN1022574C (en) | 1993-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90100927 Expired - Fee Related CN1022574C (en) | 1990-02-22 | 1990-02-22 | Dusulfurization process for cupola furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921889B (en) * | 2002-08-27 | 2012-10-10 | 杰富意钢铁株式会社 | Manufacture method of low-phosphorus molten iron |
| CN102851429A (en) * | 2011-06-30 | 2013-01-02 | 王中博 | Technology for comprehensively removing harmful impurity elements of sulfur and phosphorus from iron in iron melting furnace |
| CN103668332A (en) * | 2012-08-31 | 2014-03-26 | 沈阳铝镁设计研究院有限公司 | Low-phosphor grey cast iron smelting operation method of aluminum anode assembly medium-frequency furnace |
-
1990
- 1990-02-22 CN CN 90100927 patent/CN1022574C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921889B (en) * | 2002-08-27 | 2012-10-10 | 杰富意钢铁株式会社 | Manufacture method of low-phosphorus molten iron |
| CN102851429A (en) * | 2011-06-30 | 2013-01-02 | 王中博 | Technology for comprehensively removing harmful impurity elements of sulfur and phosphorus from iron in iron melting furnace |
| CN103668332A (en) * | 2012-08-31 | 2014-03-26 | 沈阳铝镁设计研究院有限公司 | Low-phosphor grey cast iron smelting operation method of aluminum anode assembly medium-frequency furnace |
| CN103668332B (en) * | 2012-08-31 | 2016-08-31 | 沈阳铝镁设计研究院有限公司 | Aluminium anode assembles intermediate frequency furnace low-phosphorous gray cast iron smelting method of operating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022574C (en) | 1993-10-27 |
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