BE456419A - - Google Patents
Info
- Publication number
- BE456419A BE456419A BE456419DA BE456419A BE 456419 A BE456419 A BE 456419A BE 456419D A BE456419D A BE 456419DA BE 456419 A BE456419 A BE 456419A
- Authority
- BE
- Belgium
- Prior art keywords
- alkalis
- baths
- combinations
- steel
- iron
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 229910000499 pig iron Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000001226 triphosphate Substances 0.000 claims description 3
- 235000011178 triphosphate Nutrition 0.000 claims description 3
- 125000002264 triphosphate group Chemical class [H]OP(=O)(O[H])OP(=O)(O[H])OP(=O)(O[H])O* 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 230000003009 desulfurizing Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- -1 soda Chemical class 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
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Procédé pour éliminer le phosphore et le soufre des bains de fer et.d'acier.
Il est 'connu d'éliminer le soufre et le phosphore des bains de fonte brute à l'aide de combinaisons d'alcalis.
Il a également à plusieurs reprises été proposé de traiter de la même facon les alliages d'acier et de fer. Toutefois, ces efforts n'ont conduit aucun succès pratique, parce que les températures de réaction doivent, en raison des points de fusion élevés de ces alliages, être choisies s i élevées que les combinaisons d'alcalis s'évaporent sensiblement sans avoir réagi avec les bains. La forte , vaporisation des alcalis est en outre insupportable sous le point de vue économique et provoque des ennuis,en ser- vice. Lorsque la désulfuration est effectuée dans le four, les alcalis vaporisés exercent des influences nuisibles sur la maçonnerie..
Selon l'invention, les inconvénients mentionnés ci- dessus sont évités ou du moins fortement réduits par le fait que les additions sont, en tenant compte de la quan- tité du phosphore oxydé, calculées de telle façon que les alcalis suffisent pour la formation des triphosphates,sans excéder notablement cette quantité. On a en effet consta- té que ces triphosphates sont également stables à des tem-
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pératures plus élevées et ne s'évaporent t pas. En outre, il a été trouvé de façon surprenante que ces triphophates peuvent également dissoudre des sulfures d'alcalis d'une façon si poussée' qu'il se produit non seulenient une bonne déphosphoration, mais aussi une forte désulfuration pour les alliages de fer, même pour ceux qui ont un point de fusion élevé.
Pour accélérer la transformation en phosphate d'al- cali et pour réduire ainsi, le cas échéant, des pertes de vaporisation ayant lieu avant la transformation, il est avantageux d'ajouter les alcalis à l'état liquide.
En cas d'utilisation de carbonates d'alcalis, on peut se passer de l'addition d'autres agents d'oxydation en ce/qui concerne le phosphore, perce que l'acide carbonique des carbonates suffit . cet effet.
Il est de cette façon également possible de déphosphorer, par exemple, de l'acier avec plus de 0,1 % C ainsi que de l'acier allié contenant plus de 0,5 de chrome et plus de 1 % de manganèse. On peut également traiter avec succès d'après ce procédé la fonte brute et la fonte spiegel. On obtient alors éventuellement l'avantage de prélever les scories après la première réaction, afin d'éviter des réactions supplémentaires indésirables, telles que la décarburation et la réphosphoration.
On effectue ledit procédé de préférence dans une poche, mais la conduite en est, vu les faibles pertes de vaporisation, également possible dans un four, sans qu'il se présente des avaries notables de la maçonnerie.
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Process for removing phosphorus and sulfur from iron and steel baths.
It is known to remove sulfur and phosphorus from pig iron baths using combinations of alkalis.
It has also been repeatedly proposed to treat steel and iron alloys in the same way. However, these efforts have not led to any practical success, because the reaction temperatures must, due to the high melting points of these alloys, be chosen so high that the combinations of alkalis evaporate substantially without having reacted with them. baths. The strong vaporization of the alkalis is moreover unbearable from the economic point of view and causes trouble in service. When desulphurization is carried out in the furnace, the vaporized alkalis exert harmful influences on the masonry.
According to the invention, the drawbacks mentioned above are avoided or at least greatly reduced by the fact that the additions are, taking into account the amount of oxidized phosphorus, calculated in such a way that the alkalis are sufficient for the formation of the compounds. triphosphates, without notably exceeding this quantity. It has in fact been observed that these triphosphates are also stable at temperatures.
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higher peratures and do not evaporate. In addition, it has surprisingly been found that these triphophates can also dissolve alkali sulfides so extensively that not only good dephosphorization occurs, but also strong desulfurization for iron alloys. even for those with a high melting point.
In order to accelerate the conversion into alkali phosphate and thus to reduce, where appropriate, vaporization losses occurring before the conversion, it is advantageous to add the alkalis in the liquid state.
If alkali carbonates are used, it is possible to dispense with the addition of other oxidizing agents with regard to phosphorus, since the carbonic acid of the carbonates is sufficient. this effect.
In this way it is also possible to dephosphorize, for example, steel with more than 0.1% C as well as alloy steel containing more than 0.5 chromium and more than 1% manganese. Pig iron and spiegel cast iron can also be successfully processed using this process. The advantage is then optionally obtained of removing the slag after the first reaction, in order to avoid additional undesirable reactions, such as decarburization and rephosphorization.
Said process is preferably carried out in a ladle, but the conduct thereof is, in view of the low vaporization losses, also possible in a furnace, without significant damage to the masonry occurring.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE456419A true BE456419A (en) |
Family
ID=110080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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BE456419D BE456419A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE456419A (en) |
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0
- BE BE456419D patent/BE456419A/fr unknown
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