IT8009395A1 - METHOD FOR THE DESULPHURATION OF MOLTEN METAL - Google Patents
METHOD FOR THE DESULPHURATION OF MOLTEN METAL Download PDFInfo
- Publication number
- IT8009395A1 IT8009395A1 IT1980A09395A IT0939580A IT8009395A1 IT 8009395 A1 IT8009395 A1 IT 8009395A1 IT 1980A09395 A IT1980A09395 A IT 1980A09395A IT 0939580 A IT0939580 A IT 0939580A IT 8009395 A1 IT8009395 A1 IT 8009395A1
- Authority
- IT
- Italy
- Prior art keywords
- desulfurization
- aluminum
- desulfurization agent
- agent
- metallic aluminum
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 15
- 229910052751 metal Inorganic materials 0.000 title claims description 14
- 239000002184 metal Substances 0.000 title claims description 14
- 238000006477 desulfuration reaction Methods 0.000 claims description 26
- 230000023556 desulfurization Effects 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000012943 hotmelt Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000003518 caustics Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- -1 sodium aluminum fluoride Chemical compound 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- SKFYTVYMYJCRET-UHFFFAOYSA-J potassium;tetrafluoroalumanuide Chemical compound [F-].[F-].[F-].[F-].[Al+3].[K+] SKFYTVYMYJCRET-UHFFFAOYSA-J 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052572 stoneware Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or 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
- C21C1/025—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Descrizione dell ' Invenzione Industriale dal titolo: ?METODO PER LA DESOLFORAZIONE DI METALLO FUSO d Description of the Industrial Invention entitled:? METHOD FOR THE DESULFORATION OF MOLTEN METAL d
RIASSUNTO SUMMARY
Un metodo di desolforazione della ghisa grezza fusa* che comprende il co-impiego dell '1 al 30% in peso di alluminio metallico rispetto al peso totale di un agente di desolforazione del tipo dell 5 ossido di metallo alcalino* A method of desulfurization of crude cast iron * which includes the co-use of 1 to 30% by weight of metallic aluminum with respect to the total weight of an alkali metal 5 oxide type desulfurization agent *
DESCRIZIONE DESCRIPTION
Questa invenzione si riferisce ad un perfezionamento di un metodo per la desolforazione di metallo fuso, particolarmente di ghisa grezza o ghisa d ' alto forno fusa* This invention relates to an improvement of a method for the desulphurization of molten metal, particularly of crude iron or molten blast furnace *
, Un metodo facile e conveniente ? reputato impor tante per l 'uso di un agente di desolforazione di metalli fusi? Come agenti di desolforazione pi? adat ti impiegati nel metodo di predisposizione (presetting) si fa menzione di agenti di desolforazione del tipo dell* ossido di metallo alcalino , che presentano rapidit? di reazione ed un basso punto di fusione del le scorie,, cio? agenti quali carbonato di sodio, so da caustica,, carbonato di potassio e potassio caustico o miscele di essi con piccole quantit? di fluoruro di calcio? fluoruro di sodio? ossido di e ferro,, fluoruro di alluminio, fluoruro di sodio alluminio? fluoruro di potassio alluminio e fluoruro di magnesio. , An easy and convenient method? deemed important for the use of a molten metal desulfurization agent? As more desulfurization agents? suitable used in the presetting method mention is made of desulphurizing agents of the type of alkali metal oxide, which present rapidity? reaction and a low melting point of the slag, that is? agents such as sodium carbonate, caustic, potassium carbonate and caustic potassium or mixtures of them with small quantities? of calcium fluoride? sodium fluoride? and iron oxide,, aluminum fluoride, sodium aluminum fluoride? aluminum potassium fluoride and magnesium fluoride.
Agenti di desolforazione noti quali calce viva,, carbonato di calcio? calcio-cianammide e magnesio metallico non sono adatti all ?operazione di desolforazione con il metodo di predisposizione?perch? essi sono attivi o troppo lentamente o troppo rapidamente e devono essere aggiunti nella fusione calda usando una apparecchiatura di grandi dimensioni, cosicch? essi non costituiscono agenti di desolforazione economici. Una reazione di desolforazione di metallo fuso? in caso di utilizzazione di un agen te di desolforazione del tipo dell?ossido di metallo alcalino? viene effettuata teoricamente con la copresenza di un elemento riducente. Si pu? supporre cio?? dalla formula di reazione? che il metallo alcalino libero si formi dall ?ossido alcalino per mezzo di agenti riducenti quale carbonio? silicio? alluminio? magnesio? titanio e zirconio? si lega con lo zolfo in solfuro di metallo per diventare quindi solfuro alcalino? a poi il solfuro alcalino si scioglie in scorie quando ? separato dal metallo Known desulfurization agents such as quicklime, calcium carbonate? calcium-cyanamide and metallic magnesium are not suitable for the desulphurization operation with the preparation method? they are active either too slowly or too rapidly and must be added into the hot melt using large equipment, so that they are active. they are not cheap desulphurizing agents. A molten metal desulfurization reaction? in case of use of an alkali metal oxide type desulphurization agent? it is carried out theoretically with the co-presence of a reducing element. Can you? suppose what? from the reaction formula? that the free alkali metal is formed from the alkaline oxide by means of reducing agents which carbon? silicon? aluminum? magnesium? titanium and zirconium? binds with the sulfur in metal sulphide to become alkaline sulphide? then the alkaline sulphide dissolves in slag when? separated from the metal
E' evidente, dal diagramma della fase di Fe-Al, che ? l'alluminio l?elemento suscettibile di fusione in acciaio fuso avente maggiori possibilit? di presentare un'azione di desolforazione fino alla estinzione,, Il magnesio, che ? un metallo altamente reattivo,, fonde d?altra parte in una quantit? inferiore di fer ro fuso, cosicch? la sua reattivit? ? sostanzialmente inferiore,, Inoltre, un altro vantaggio dell?alluminio, quando ? usato per la desolforazione di ghisa grezza fusa, ? che esso non fa diminuire la basicita delle scorie, per cui la reazione di desolforazione ? effettuata continuamente alle stesse condizioni . It is evident, from the Fe-Al phase diagram, that? the aluminum element susceptible to fusion in molten steel having greater possibilities? to present an action of desulphurization until extinction ,, Magnesium, what? a highly reactive metal, melts on the other hand in a quantity? inferior of molten iron, so that? its reactivity? ? substantially lower ,, Furthermore, another advantage of aluminum, when? used for the desulphurization of crude cast iron,? that it does not decrease the basicity of the slag, so the desulphurization reaction? carried out continuously under the same conditions.
La presente invenzione consiste nel prevedere un agente di desolforazione del tutto adatto per il metodo di predisposizione (presetting) , che ? semplice e conveniente per la desolforazione di metalli fusi, particolarmente di ghisa grezza fusa, ed in un metodo adatto per l?aggiunta di detto agente di desolforazione*, Il metodo di desolforazione consiste cio?, o nel fondere precedentemente alluminio in ghisa grezza fusa e poi nel far reagire la ghisa gres, za con un agente di desolforazione, o nell'aggiungere simultaneamente alluminio ed agente di desolforazione nella ghisa fusa? Comunque preferibilmente , l ' alluminio va aggiunto alla ghisa fusa prima del-1 ' agente di desolforazione.. The present invention consists in providing a desulphurizing agent wholly suitable for the presetting method, which? simple and convenient for the desulphurization of molten metals, particularly of crude molten iron, and in a suitable method for the addition of said desulfurization agent *. then in making the porcelain stoneware cast iron react with a desulfurization agent, or in simultaneously adding aluminum and desulfurization agent in the molten cast iron? However, preferably, the aluminum should be added to the cast iron before the desulfurization agent.
Come agente di desolforazione del tipo dell 'os sido di metallo alcalino, che presenta effetti per detto metodo di predisposizione, si impiega, sotto forma di polvere, granuli, massa o fiocchi, una qual siasi sostanza anidra, sale idrato e carbonato di idrogeno di uno o pi? fra carbonato di potassio, carbonato di sodio, soda caustica, potassio caustico e carbonato di sodio e potassio. Inoltre, se l ? agente di desolforazione ? usato in forma di granuli o di massa, ad esso pu? essere aggiunto un legante; organico di una piccola quantit? di amido, destrina, colla, resina naturale o resina sintetica, od un legante inorganico di cemento, vetro solubile, argilla, silice colloidale o fosfato di alluminico L' alluminio metallico in forma di massa, granuli o di elemento granulato di polvere, ? caricato od inserito nella fusione calda, ma per ritardare la reazione ? possibile prevedere, alia periferia esterna di detta massa, granuli o elemento granulato. un recipiente, rivestimento o veicolo che consiste di un materiale che non pu? avere effetti negativi sulla, fusione calda o sul refrattario della parete interna del recipiente per la fusione . As a desulfurization agent of the alkali metal oxide type, which has effects for said preparation method, any anhydrous substance, hydrated salt and hydrogen carbonate of one or more? between potassium carbonate, sodium carbonate, caustic soda, caustic potassium and sodium and potassium carbonate. Furthermore, if l? desulfurization agent? used in the form of granules or mass, to it pu? a binder be added; organic of a small amount? of starch, dextrin, glue, natural resin or synthetic resin, or an inorganic binder of cement, soluble glass, clay, colloidal silica or aluminic phosphate Metallic aluminum in the form of mass, granules or granulated element of powder,? loaded or inserted into the hot melt, but to delay the reaction? It is possible to provide, at the outer periphery of said mass, granules or granulated element. a receptacle, lining, or vehicle that consists of a material that cannot adversely affect the hot melt or refractory of the inner wall of the casting vessel.
comparativi . comparative.
In ciascuno degli esempie gli effetti di desolforazione dell?aggiunta o non aggiunta d? alluminio sno stati comparati usando ghisa grezza dello stes^ so componente ed una siviera per metallo caldo della stessa capacit? ed impiegando un metodo di predisposizione? La capacit? della siviera per metallo caldo ? di 250 tonnellate e 240 tonnellate di ghisa grezza fusa sono state colate in detta siviera per mezzo di un veicolo di miscelazione di ghisa fusa per effettuare cos? un trattamento di desolforazio ne? In each of the examples, the desulphurization effects of the addition or non-addition d? aluminum were compared using crude iron of the same component and a hot metal ladle of the same capacity. and employing a predisposition method? The capacity ladle for hot metal? of 250 tons and 240 tons of crude cast iron were poured into said ladle by means of a molten iron mixing vehicle to carry out cos? a desulfurization treatment?
Dal confronto si comprender? che l?agente di desolforazione usato insieme all'allum?nio metallico presenta una rapidit? di desolforazione superiore del 5-12% rispetto all?agente da usarsi separatamente? From the comparison you will understand? that the desulfurization agent used together with the metallic aluminum presents a rapidity? 5-12% higher desulphurization than the agent to be used separately?
Nel presente metodo di desolforazione, un agente di desolforazione del tipo dell'ossido di metallo alcalino ed alluminio metallico sono miscelati immediatamente prima dell'uso oppure sono caricati simul taneamente come unit? separate. Alternativamente si pu? adottare un metodo in cui la fusione calda viene colata dopo che 1'alluminio metallico ? stato pre cedentemente disposto in un recipiente di trattamento , ed un agente di desolforazione del tipo dell'ossido di metallo alcalino viene caricato ed aggiunto al flusso di colata, a met? colata della fusione. Il rapporto di uso dell'alluminio metallico rispetto ai peso totale di detto agente di desolforazione ? nella gamma dall'1 al 30% in peso. Con una percentuale inferiore all'1% di alluminio metallico inazione riducente non ha effetto sull'agente di desolforaziones e con una percentuale superiore al 30% l'agente di desolforazione diminuisce di quantit? rendendo per tanto necessario l'uso di una notevole quantit? dello stesso. Di conseguenza, si ha una tale produzione di ossido di alluminio che viene impedita la flu? dit? delle scorie, e quindi tale eccesso non ? desiderabile, In the present desulfurization method, an alkali metal oxide and metal aluminum desulfurization agent are mixed immediately prior to use or are loaded simultaneously as a unit. separate. Alternatively, you can? to adopt a method in which the hot melt is cast after the metallic aluminum? previously placed in a treatment vessel, and an alkali metal oxide type desulfurization agent is charged and added to the casting stream, halfway through. casting of the fusion. The use ratio of the metallic aluminum to the total weight of said desulfurization agent? in the range of 1 to 30% by weight. With a percentage lower than 1% of metallic aluminum the reducing action has no effect on the desulfurization agent and with a percentage higher than 30% the desulfurization agent decreases in quantity. thus making it necessary to use a considerable amount? of the same. Consequently, there is such a production of aluminum oxide that flu is prevented. dit? of waste, and therefore this excess is not? desirable,
IX metodo d? desolforazione dell'invenzione sar? ora descritto sotto per confronto con esempi IX method d? desulphurization of the invention will be? now described below for comparison with examples
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3698779A JPS55131112A (en) | 1979-03-30 | 1979-03-30 | Molten metal desulfurizing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT8009395A1 true IT8009395A1 (en) | 1981-09-28 |
Family
ID=12485091
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT09395/80A IT1153795B (en) | 1979-03-30 | 1980-03-28 | METHOD FOR DESULPHURING MELT METAL |
| IT1980A09395A IT8009395A1 (en) | 1979-03-30 | 1980-03-28 | METHOD FOR THE DESULPHURATION OF MOLTEN METAL |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT09395/80A IT1153795B (en) | 1979-03-30 | 1980-03-28 | METHOD FOR DESULPHURING MELT METAL |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS55131112A (en) |
| AU (1) | AU524961B2 (en) |
| BE (1) | BE881916A (en) |
| CA (1) | CA1139568A (en) |
| DE (1) | DE3009477A1 (en) |
| FR (1) | FR2452521A1 (en) |
| GB (1) | GB2050430A (en) |
| IT (2) | IT1153795B (en) |
| LU (1) | LU82305A1 (en) |
| NL (1) | NL8001834A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63145707A (en) * | 1986-12-08 | 1988-06-17 | Nisshin Steel Co Ltd | Desulfurizing agent of molten iron |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR573866A (en) * | 1923-11-28 | 1924-07-02 | Desulphurizing agent for iron and steel | |
| DE881797C (en) * | 1949-11-30 | 1953-07-02 | Solvay Werke Gmbh | Desulfurization and deoxidization of an iron melt |
| FR1125154A (en) * | 1955-04-28 | 1956-10-25 | Siderurgie Fse Inst Rech | Process for desulphurizing molten metals and in particular cast iron |
| FR1168646A (en) * | 1957-02-21 | 1958-12-11 | Siderurgie Fse Inst Rech | Insufflation process for desulphurizing molten metals, in particular cast iron and steel |
| CH363670A (en) * | 1962-01-11 | 1962-08-15 | Technochemie Ets | Means for desulphurisation and / or dephosphorization of iron and steel melts and processes for their production |
| LU65436A1 (en) * | 1971-06-07 | 1972-08-24 | ||
| DE2730016C3 (en) * | 1977-07-02 | 1984-05-30 | Stahlwerke Peine-Salzgitter Ag, 3150 Peine | Process for soda desulphurization of iron melts |
-
1979
- 1979-03-30 JP JP3698779A patent/JPS55131112A/en active Pending
-
1980
- 1980-02-26 BE BE2/58428A patent/BE881916A/en not_active IP Right Cessation
- 1980-03-05 CA CA000347048A patent/CA1139568A/en not_active Expired
- 1980-03-11 GB GB8008110A patent/GB2050430A/en not_active Withdrawn
- 1980-03-12 DE DE19803009477 patent/DE3009477A1/en not_active Ceased
- 1980-03-25 AU AU56802/80A patent/AU524961B2/en not_active Ceased
- 1980-03-28 FR FR8006932A patent/FR2452521A1/en active Pending
- 1980-03-28 NL NL8001834A patent/NL8001834A/en not_active Application Discontinuation
- 1980-03-28 IT IT09395/80A patent/IT1153795B/en active
- 1980-03-28 IT IT1980A09395A patent/IT8009395A1/en unknown
- 1980-03-28 LU LU82305A patent/LU82305A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB2050430A (en) | 1981-01-07 |
| FR2452521A1 (en) | 1980-10-24 |
| NL8001834A (en) | 1980-10-02 |
| IT1153795B (en) | 1987-01-21 |
| BE881916A (en) | 1980-06-16 |
| JPS55131112A (en) | 1980-10-11 |
| AU5680280A (en) | 1980-10-02 |
| DE3009477A1 (en) | 1980-10-09 |
| IT8009395A0 (en) | 1980-03-28 |
| CA1139568A (en) | 1983-01-18 |
| LU82305A1 (en) | 1980-07-01 |
| AU524961B2 (en) | 1982-10-14 |
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