EP0602540B1 - Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen-, Gusseisen-, Ferrochrom- und Ferromanganschmelzen sowie Verfahren - Google Patents
Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen-, Gusseisen-, Ferrochrom- und Ferromanganschmelzen sowie Verfahren Download PDFInfo
- Publication number
- EP0602540B1 EP0602540B1 EP93119836A EP93119836A EP0602540B1 EP 0602540 B1 EP0602540 B1 EP 0602540B1 EP 93119836 A EP93119836 A EP 93119836A EP 93119836 A EP93119836 A EP 93119836A EP 0602540 B1 EP0602540 B1 EP 0602540B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- agent
- agent according
- iron
- melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- C21C1/025—Agents used for dephosphorising or desulfurising
Definitions
- the invention relates to an agent and its application for desulfurization, dephosphorization, desiliconing and denitrification of pig iron, cast iron, ferrochrome and ferromanganese melting.
- the backlog from this Decomposition is always - whether hydrated lime or limestone is used - lime, which at the temperatures of treated melts is in the solid state.
- lime particles present in the solid state hardly or only to a small extent on the desulfurization participate, which is why they are referred to as metallurgically passive become.
- the known gas-releasing substances part of the calcium carbide for chemical reactions with the carbon dioxide of the added carbonate or Water from the hydroxides is consumed.
- the treatment agents are hydrogen or nitrogen-releasing substances added. The addition such substances, if hydrogen gas is formed will have a deoxidizing effect unless this effect is restricted by large amounts of production gas. The problem the solid reaction does not experience any of these additives Solution.
- fluorspar has no fundamental desulfurizing effect be attributed.
- stirrer desulfurization process always the risk of crusting.
- the slag In the field of Melt pool surface is caused by the rotation of the stirring bar the slag more or less on the wall of the Vessel pressed.
- the calcium carbide In the forming crusts in shape the calcium carbide preferably sticks to caking, so that it is not drawn into the melt via the drum becomes. In this way, the calcium carbide burns ineffectively or remains unused in the slag. As a result Such a crust formation will damage Stirring bar and its lifespan is reduced, so that the practical use of the theoretically very effective stirring method is often restricted.
- JP-A-51 054016 describes a desulfurization agent which consists of 70 to 99% by weight technical calcium carbide (70-80% by weight CaC 2 , the remainder essentially CaO) and 1 to 30% by weight kaolinite (main components Al 2 O 3 and SiO 2 ), montmorillonite, mica (mica) with the main components K 2 O, Al 2 O 3 and SiO 2 .
- alkali silicates such as nepheline, syenite, orthoclase (Al 2 O 3 .6SiO 2 .K 2 O)
- feldspar orthoclass and plagioclase
- feldspathoid with a high content of Na 2 O and K 2 O.
- the invention is therefore based on the object Desulphurization, dephosphorization, desilicon agents and denitrification of pig iron and cast iron melts, which has the advantages of calcium carbide or Lime is able to preserve and with suitable additives is also able to cope with the negative influences of Solid-liquid reaction and the constantly fluctuating operating conditions to eliminate or at least reduce.
- the agent should also be suitable in ferrochrome and Ferromanganese melting desulfurizing or dephosphoric to act.
- Independent claim 9 relates to a method for Treatment of iron, ferrochrome and ferromangan melts with the agent according to claim 1, wherein the components of the Dosed separately and conveyed into the melt become.
- the mineral raw materials mentioned are characterized by the following and essential features for the overall reaction from: You are at the temperature of the pig iron, the Cast iron or the chrome and manganese melts essentially liquid; they depart in the course of Heating up to the temperature of the surrounding melt gaseous phases, which significantly increase the mixing favor. For example, the alkaline plagioclase and orthoclase in the melt free sodium and potassium, which evaporate.
- the mineral mentioned Raw materials or their components lead sodium and potassium to improve the absorption capacity of the slag for sulfur, so that the distribution factor slag / Melt is positively influenced. Moreover, they can the unwanted steel elements sulfur and Bind phosphorus.
- Montmorillonites e.g. in the form of the well-known pearlite briefly a foam phase as soon as it enters the Metal melt arrive. Leads in a comparable way Na bentonite due to the elimination of sodium for improvement desulfurization.
- the mineral raw materials mentioned are abundant and inexpensive, are easy to process and can be used without restrictions. There are no ecological problems associated with the use of these mineral raw materials. If necessary, their composition can be optimized in their composition by sintering measures or fusion with other materials, such as sodium, lithium or potassium carbonate, among others. By adding alkali carbonate, the alkali oxide content can be increased to 50% by weight by means of a sintering or melting process. Sodium carbonate is preferably used to adjust the Na 2 O content to approximately 30% by weight.
- the calcium carbide content is 30 to 60% by weight.
- the calcium carbide can be in a eutectic composition (about 67% by weight CaC 2 ) or can be used as technical carbide (78 to 81% by weight CaC 2 , balance CaO, SiO 2 and Al 2 O 3 ).
- a lime content in the agent according to the invention of 10 to 30% by weight has proven to be advantageous.
- the agent according to the invention can be used in addition to its use as a desulfurization agent for dephosphorization, for desiliconization and for denitrification of iron melts and in ferrochrome and ferromanganese melts.
- the agent according to the invention preferably contains at least one further additive in the form of iron oxides, iron ores, scale, chrome or manganese ore, optionally supplemented by lime and / or an alumina carrier such as kaolinite ([Al (OH) 4 ] 2 [Si 2 O 5 ]), muscovite ([K Al 2 (OH) 2 ] [Si 3 O 10 ]) or montmorillonite ([Al 2 (OH) 2 ] [Si 4 O 10 ]) in an amount of 5 to 20% by weight. -% as a slag generator.
- the iron oxide content is particularly preferably 5 to 40% by weight, an iron oxide content of 30 to 40% by weight having been found to be the most suitable.
- the 10 to 50 wt .-% agent according to the invention from at least one of the raw materials zeolite, bentonite, vermiculite, and / or Muskovit, remainder calcium carbide and / or lime exists.
- the components of the agent according to the invention have essentially the same grain size ⁇ 9 mm, with a grain size of ⁇ 0.5 for the blowing process mm and a grain size of ⁇ 2 for the stirrer method mm is provided.
- the tapping channel or tapping pan Grain of the agent in the range of ⁇ 5 mm.
- the agent according to the invention is either a Immersion lance introduced into the melt or with suitable Devices abandoned.
- By using two or more dosing systems can use the components of the agent combined in the lance or mixed in the task become.
- To the composition of the agent during the To be able to change the treatment of the melt are the Components of the agent dosed separately and into the Promoted melt.
- the tests were carried out in an open pan with approx. 185 t and in torpedo pans with approx. 220 t pig iron.
- the initial sulfur content S A was in the range of 0.042% by weight.
- the pig iron temperature in the tests ranged from 1350 to 1420 ° C.
- Fig. 1 shows for the mixtures 4 and 7, which are compared to mixtures 1 to 3 by reduced Calcium carbide shares are characterized, a slightly reduced Desulphurization capacity of approx. 79% for the mixture 4 and of about 80% for the mixture 7, each with one Use of 4 kg desulfurization mixture per t melt.
- the slag was after treatment so flexible that it can be tilted simply by tilting it could be made to expire; the rest of the slag could be easily removed mechanically. There were no crusts observed; the favorable slag consistency remained enough for an operational process received for a long time.
- the calm reaction of feldspar which was increased to 30 to 50% by weight in the Na 2 O or K 2 O content in the sintering or melt flow, was particularly favorable and completely surprising.
- the proportion of albite or Na 2 O-enriched albite in mixtures for targeted dephosphorization / desiliconing / denitrification was limited to approximately 15 to 50% by weight.
- the addition to 100% was carried out with the help of scale or iron ore and lime. It was found that the nitrogen breakdown is essentially linearly related to the albite content in the mixture used, a more progressive effect being observed at higher albite contents. On the basis of these results, it is possible to reduce the nitrogen content of pig iron by 10 to 40% by weight with the addition of albite to the dephosphorization or desulfurization agent.
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)
Description
- alkalihaltige Plagioklase, z.B. Na-Feldspat (Albit)
- alkalihaltige Orthoklase, z.B. Kali-Feldspate, Nepheline, Nephelin-Syenit,
- Perlite,
- Bentonite,
- Vermiculit,
- Muskovit,
- Zeolith,
Die nachfolgenden Beispiele sollen diese Erfindung näher erläutern.
Die Komponenten wurden sowohl im vorgemischten Zustand (Mono-Injektion) als auch getrennt mit zwei bis drei Blasgeräten (Co-Injektion) eingetragen, wobei die Mischung in der Leitung zur Lanze erfolgte.
1. | Gemisch | 60 | Gew.-% Calciumcarbid (technisch) + |
20 | Gew.-% Kalk, Rest Albit | ||
2. | Gemisch | 60 | Gew.-% Calciumcarbid (eutektisch) + |
20 | Gew.-% Albit + 10 Gew.-% Perlit + | ||
10 | Gew.-% Kalk | ||
3. | Gemisch | 60 | Gew.-% Calciumcarbid (eutektisch) + |
25 | Gew.-% Nephelin-Syenit + 15 Gew.-% Kalk | ||
4. | Gemisch | 50 | Gew.-% Calciumcarbid (technisch) + |
30 | Gew.-% Kalk bzw. 20 Gew.-% Zeolith | ||
5. | Gemisch | 60 | Gew.-% Albit (angereichert im Schmelzfluß |
auf | ca. 30 % Na2O im Endprodukt) + | ||
20 | Gew.-% Kaolinit + 20 Gew.-% Kalk | ||
6. | Gemisch | 60 | Gew.-% Albit (angereichert auf 30 % Na2O) |
40 | Gew.-% Kalk | ||
7. | Gemisch | 40 | Gew.-% K-Feldspat + 10 Gew.-% Kalk + |
50 | Gew.-% Calciumcarbid | ||
8. | Gemisch | 70 | Gew.-% Kalk + 20 Gew.-% Albit + |
10 | Gew.-% Bentonit |
Claims (10)
- Mittel zur Entschwefelung, Entphosphorung, Entsilizierung und Entstickung von Roheisen-, Gußeisen-, Ferrochrom- und Ferromanganschmelzen, bestehend aus (Summe aller Komponenten = 100 Gewichtprozent)30 bis 60 Gewichtsprozent technisches Calciumcarbid oder eutektisches Calciumcarbid,10 bis 30 Gewichtsprozent Calciumoxid sowie10 bis 60 Gewichtsprozent eines oder mehrerer der folgenden mineralischen Rohstoffe:alkalihaltige Plagioklase, z.B. Na-Feldspat (Albit)alkalihaltige Orthoklase, z.B. Kali-Feldspate, Nepheline, Nephelin-Syenit,Perlite,Bentonite,Vermiculit,Muskovit,Zeolith,5 bis 40 Gewichtsprozent Eisenoxide in Form von Eisenerzen, Zunder, Chrom- oder Manganerz,5 bis 20 Gewichtsprozent eines Tonerdeträgers.
- Mittel nach Anspruch 1 zur Entphosphorung, Entsilicierung und Entstickung, dadurch gekennzeichnet, daß es außer den mineralischen Komponenten noch Eisenoxide in Form von Eisenerzen oder Zunder, Chrom- oder Manganerz in einer Menge von 5 bis 40 Gew.-% enthält.
- Mittel nach den Ansprüchen 1 bis 2, dadurch gekennzeichnet, daß das Mittel einen Tonerdeträger in einer Menge von 5 bis 20 Gew.-% enthält.
- Mittel nach einem der Ansprüche 1 oder 3, dadurch gekennzeichnet, daß es zu 10 bis 50 Gew.-% aus wenigstens einem der mineralischen Rohstoffe Zeolith, Bentonit, Vermiculit, Muskovit, Rest Calciumcarbid und Calciumoxid, besteht.
- Mittel nach Anspruch 4, dadurch gekennzeichnet, daß es zu 10 bis 30 Gew.-% aus wenigstens einem der mineralischen Rohstoffe Zeolith, Bentonit, Vermiculit, Muskovit, Rest Calciumcarbid und Calciumoxid, besteht.
- Mittel nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die einzelnen Komponenten eine im wesentlichen gleiche Körnungsgröße ≤ 9 mm besitzen und zwar für das Einblas-Verfahren sowie für die Zugabe zur Abstichrinne bzw. Abstichpfanne ≤ 5 mm und für das Rühr-Verfahren ≤ 2 mm.
- Mittel nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß sein Gehalt an Alkalioxid durch Sintern oder Schmelzen der mineralischen Rohstoffe mit alkalireichen Verbindungen auf einen Gehalt von bis zu 50 Gew.-% Alkalioxid angehoben wird.
- Mittel nach Anspruch 7, dadurch gekennzeichnet, daß die mineralischen Rohstoffe in ihrem Gehalt an Natriumoxid durch Schmelzen mit Soda auf einen Gehalt von 30 Gew.-% Natriumoxid angehoben werden.
- Verfahren zur Behandlung von Eisen-, Ferrochrom- und Ferromanganschmelzen mit einem Mittel gemäß Anspruch 1, dadurch gekennzeichnet, daß das Mittel durch Einblasen über eine Tauchlanze in die Schmelze eingebracht wird.
- Verfahren zur Behandlung von Eisen-, Ferrochrom- und Ferromanganschmelzen mit einem Mittel gemäß Anspruch 1, dadurch gekennzeichnet, daß die Bestandteile des Mittels getrennt dosiert und in die Schmelze gefördert werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4242328 | 1992-12-15 | ||
DE4242328A DE4242328C2 (de) | 1992-12-15 | 1992-12-15 | Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen- und Gußeisenschmelzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0602540A1 EP0602540A1 (de) | 1994-06-22 |
EP0602540B1 true EP0602540B1 (de) | 2002-03-06 |
Family
ID=6475346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93119836A Expired - Lifetime EP0602540B1 (de) | 1992-12-15 | 1993-12-09 | Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen-, Gusseisen-, Ferrochrom- und Ferromanganschmelzen sowie Verfahren |
Country Status (6)
Country | Link |
---|---|
US (1) | US5385599A (de) |
EP (1) | EP0602540B1 (de) |
JP (1) | JPH06235011A (de) |
AT (1) | ATE214106T1 (de) |
DE (2) | DE4242328C2 (de) |
ZA (1) | ZA939420B (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT406690B (de) † | 1994-12-09 | 2000-07-25 | Donau Chemie Ag | Mittel zur behandlung von roheisen- und gusseisenschmelzen zum zweck der entschwefelung |
AT406691B (de) * | 1998-06-10 | 2000-07-25 | Holderbank Financ Glarus | Verfahren zum entsilizieren von roheisen vor einem frischen zu stahl |
FR2787468B1 (fr) | 1998-12-18 | 2001-12-07 | Lorraine Laminage | Procede de denitruration de l'acier en fusion en cours d'elaboration |
US6143050A (en) * | 1999-06-09 | 2000-11-07 | W. R. Grace & Co.- Conn. | Modifying slag for smelting steel in electric arc furnaces |
AT412477B (de) * | 2003-07-14 | 2005-03-25 | Donau Chemie Ag | Mittel zur entschwefelung von metallschmelzen |
US20050056120A1 (en) * | 2003-09-15 | 2005-03-17 | Flores-Morales Jose Ignacio | Desulphurization of ferrous materials using sodium silicate |
US20050066772A1 (en) * | 2003-09-26 | 2005-03-31 | Flores-Morales Jose Ignacio | Desulphurization of ferrous materials using glass cullet |
CN100526480C (zh) * | 2006-06-28 | 2009-08-12 | 宜兴市振球炉料有限公司 | Kr法铁水预处理用脱磷剂 |
CN101016578B (zh) * | 2007-02-14 | 2010-05-19 | 于世发 | 高炉熔融法生产的钢液净化渣剂 |
JP5413300B2 (ja) * | 2010-05-07 | 2014-02-12 | 新日鐵住金株式会社 | 鉱物含有溶鋼脱硫フラックス |
US9127327B2 (en) | 2011-03-31 | 2015-09-08 | Nippon Steel & Sumitomo Metal Corporation | Environmentally friendly flux for molten steel desulfurization |
KR101230580B1 (ko) * | 2012-11-01 | 2013-02-06 | 신희찬 | 제강 플럭스용 바인더 조성물 및 그 제조방법 |
CN103864472B (zh) * | 2014-02-26 | 2016-03-09 | 化工部长沙设计研究院 | 一种吸附法由钾长石分解母液制备钾肥的工艺 |
CN108588317B (zh) * | 2018-01-25 | 2020-12-18 | 河北龙凤山铸业有限公司 | 一种超高纯生铁制备***及制备方法 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
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US1890485A (en) * | 1929-11-06 | 1932-12-13 | Paul R Caruthers | Method of treating metal |
US3258327A (en) * | 1963-10-31 | 1966-06-28 | Harbison Walker Refractories | Mixture for pelletizing iron ore |
DE1758250B1 (de) * | 1968-04-29 | 1971-10-28 | Sueddeutsche Kalkstickstoff | Mittel zum Entschwefeln von Eisenschmelzen |
DE2252795C3 (de) * | 1972-10-27 | 1982-09-09 | Skw Trostberg Ag, 8223 Trostberg | Entschwefelungsmittel für Roheisen- und Ferrolegierungsschmelzen |
DE2342405A1 (de) * | 1972-10-27 | 1975-03-13 | Sueddeutsche Kalkstickstoff | Mittel zum entschwefeln von metallschmelzen |
DE2252796C3 (de) * | 1972-10-27 | 1982-08-12 | Skw Trostberg Ag, 8223 Trostberg | Entschwefelungsmittel für Roheisen und Ferrolegierungsschmelzen |
CA1060214A (en) * | 1974-02-27 | 1979-08-14 | Masaru Takashima | Method for desulfurizing molten iron |
JPS5154016A (ja) * | 1974-11-07 | 1976-05-12 | Denki Kagaku Kogyo Kk | Yosennodatsuryuzai |
US4147539A (en) * | 1978-01-12 | 1979-04-03 | Nalco Chemical Company | Preparation of cupola flux |
DE3008950C2 (de) * | 1980-03-08 | 1983-06-01 | Hoechst Ag, 6230 Frankfurt | Entschwefelungsmittel und Verfahren zu seiner Herstellung |
ES497686A0 (es) * | 1979-12-29 | 1981-11-01 | Hoechst Ag | Procedimiento para la preparacion de un agente para la de- sulfuracion de masas fundidas metalicas |
DE3015024C2 (de) * | 1980-04-18 | 1982-12-23 | Skw Trostberg Ag, 8223 Trostberg | Entschwefelungsmittel für Roheisen |
SU969746A1 (ru) * | 1981-01-05 | 1982-10-30 | Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт | Шлакообразующа смесь дл выплавки стали |
US4507478A (en) * | 1983-09-26 | 1985-03-26 | Eli Lilly And Company | 2-Mercaptopyrimidohexahydroquinolines and related compounds |
IT1201506B (it) * | 1985-12-03 | 1989-02-02 | Giovanni Crespi | Miscela fondente per scorie d'acciaierie in forni ad arco,forni a ossigeno tipo ld, o.b.m.,kaldo e altri similari |
BR8606249A (pt) * | 1985-12-17 | 1987-09-29 | Sueddeutsche Kalkstickstoff | Composicao finamente granulada para a dessulfuracao de ferro fundido e processo para sua preparacao |
IT1226383B (it) * | 1988-08-23 | 1991-01-11 | Giovanni Crespi | Miscela fondente desolforante esente da fluoro per scorie basiche di acciaierie |
DE3908071A1 (de) * | 1989-03-13 | 1990-09-20 | Hoechst Ag | Mittel und verfahren zum entschwefeln von metallschmelzen |
SU1713936A1 (ru) * | 1989-07-26 | 1992-02-23 | Карагандинский металлургический комбинат | Способ передела фосфористого чугуна в конвертере |
-
1992
- 1992-12-15 DE DE4242328A patent/DE4242328C2/de not_active Expired - Fee Related
-
1993
- 1993-12-09 AT AT93119836T patent/ATE214106T1/de not_active IP Right Cessation
- 1993-12-09 DE DE59310267T patent/DE59310267D1/de not_active Expired - Fee Related
- 1993-12-09 EP EP93119836A patent/EP0602540B1/de not_active Expired - Lifetime
- 1993-12-14 US US08/166,639 patent/US5385599A/en not_active Expired - Fee Related
- 1993-12-14 JP JP5342070A patent/JPH06235011A/ja active Pending
- 1993-12-15 ZA ZA939420A patent/ZA939420B/xx unknown
Also Published As
Publication number | Publication date |
---|---|
US5385599A (en) | 1995-01-31 |
ATE214106T1 (de) | 2002-03-15 |
EP0602540A1 (de) | 1994-06-22 |
ZA939420B (en) | 1994-08-10 |
JPH06235011A (ja) | 1994-08-23 |
DE59310267D1 (de) | 2002-04-11 |
DE4242328C2 (de) | 1995-06-08 |
DE4242328A1 (de) | 1994-06-16 |
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