EP0866880A1 - Entschwefelungsmittel zur koinjektions-behandlung von roheisenschmelzen - Google Patents
Entschwefelungsmittel zur koinjektions-behandlung von roheisenschmelzenInfo
- Publication number
- EP0866880A1 EP0866880A1 EP96943075A EP96943075A EP0866880A1 EP 0866880 A1 EP0866880 A1 EP 0866880A1 EP 96943075 A EP96943075 A EP 96943075A EP 96943075 A EP96943075 A EP 96943075A EP 0866880 A1 EP0866880 A1 EP 0866880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnesium
- granules
- calcium carbide
- injection
- grain size
- 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.)
- Granted
Links
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 a method for desulfurizing pig iron melts by the co-injection of magnesium granules and a second component.
- magnesium fines below 0.1 mm are rejected to avoid the risk of a dust explosion.
- magnesium granules which have a grain size of approximately 0.1 to 0.8 mm have therefore also become established in practice, the granules also being encased for additional security.
- the wrapping The granules serve the purpose of reducing the relatively easy flammability of the highly reactive metal
- This so-called "passivation" of the pyrogenic magnesium is usually carried out by coating with organic nitrogen compounds, of which compounds of the NCN type, for example s-triazme and guanidine compounds, have proven to be particularly suitable in practice.
- organic nitrogen compounds of which compounds of the NCN type, for example s-triazme and guanidine compounds, have proven to be particularly suitable in practice.
- an adhesion promoter mostly viscous mineral oils or vegetable oils
- the manufacturers of the magnesium granules manufacture a product which has a relatively high proportion of particles between 0.5 and 0.8 mm in size can only be conveyed pneumatically very poorly and therefore only with great effort and therefore require very long unloading and downtimes of the silo vehicles, whereby on the part of the user very high consumption of inert gas, usually nitrogen, is necessary, which is the co-injection process additionally expensive.
- the object of the invention is therefore to overcome these difficulties which occur in the pneumatic handling of magnesium granules in the context of the treatment of the projection.
- Another object of the invention is a method for desulfurizing pig iron by co-injecting magnesium granules with a grain size of 0.1 to 0.8 mm and a second component, these two components being separated, pneumatically conveyed and only immediately before being introduced into the melt is mixed, which is characterized in that one uses a magnesium granulate which contains 5 to 20 wt .-% calcium carbide with a grain size ⁇ 0.1 mm.
- the essence of the invention is therefore that 5 to 20 wt .-% of the magnesium granules for calcium carbide with a grain size ⁇ 0.1 mm are replaced.
- the amount of calcium carbide is preferably 8 to 12% by weight.
- the magnesium granules can be present in coated form in a manner known per se.
- the shell of the magnesium grains preferably consists of organic nitrogen compounds, in particular those of the NCN type, as explained in more detail above.
- the desulfurizing agent component according to the invention is conveyed separately from the other co-injection component, which is usually calcium carbide and / or lime, and is mixed with the other co-injection component as homogeneously as possible only immediately before being introduced into the pig iron melt.
- the other co-injection component which is usually calcium carbide and / or lime
- the conveying rate when unloading the silo vehicles could be increased from an average of 200 to 240 kg min " 1 to approx. 500 kg / min " 1 , which also involves a corresponding reduction in the consumption of production gas.
- the invention thus brings a significant improvement. Since the magnesium prices are an order of magnitude higher than that of calcium carbide, the replacement of up to 20 wt.
- a desulphurization mixture consisting of uncoated Mg granules with a particle size distribution between 0.1 and 0.8 mm was used as the first co-injection component and calcium carbide with a grain size of ⁇ 0.1 mm as the second co-injection component. 14 batches were selected from 1000 batches of a normal steel mill production campaign, which were then desulfurized exactly from 0.05% [S] to 0.005% [S]. With a medium one Batch weight of 210 t, the average consumption of desulfurization mixture was:
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19546235 | 1995-12-12 | ||
DE19546235A DE19546235C2 (de) | 1995-12-12 | 1995-12-12 | Entschwefelungsmittel zur Koinjektionsbehandlung von Roheisenschmelzen |
PCT/EP1996/005515 WO1997021841A1 (de) | 1995-12-12 | 1996-12-10 | Entschwefelungsmittel zur koinjektions-behandlung von roheisenschmelzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0866880A1 true EP0866880A1 (de) | 1998-09-30 |
EP0866880B1 EP0866880B1 (de) | 2000-04-05 |
Family
ID=7779822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96943075A Expired - Lifetime EP0866880B1 (de) | 1995-12-12 | 1996-12-10 | Entschwefelungsmittel zur koinjektions-behandlung von roheisenschmelzen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0866880B1 (de) |
CZ (1) | CZ182598A3 (de) |
DE (2) | DE19546235C2 (de) |
PL (1) | PL185316B1 (de) |
WO (1) | WO1997021841A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1087035C (zh) * | 1999-11-02 | 2002-07-03 | 北京科技大学 | 用镁基脱硫剂进行的浅熔池铁水喷吹预处理方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6058283B2 (ja) * | 1978-03-24 | 1985-12-19 | 東ソー株式会社 | 冶金用添加剤の製造法 |
CA1240842A (en) * | 1984-05-16 | 1988-08-23 | Heinrich Rellermeyer | Method, process and composition for desulfurizing pig-iron melts |
DE3831831C1 (de) * | 1988-09-20 | 1989-11-02 | Skw Trostberg Ag, 8223 Trostberg, De | |
DE8816829U1 (de) * | 1988-09-20 | 1990-12-20 | Skw Trostberg Ag, 8223 Trostberg | Mittel zur Entschwefelung von Eisenschmelzen |
FR2688230A1 (fr) * | 1992-03-05 | 1993-09-10 | Pechiney Electrometallurgie | Desulfurant pour la fonte a base de poudres ultrafines de magnesium ou de carbure de calcium agglomerees par un liant polymere. |
-
1995
- 1995-12-12 DE DE19546235A patent/DE19546235C2/de not_active Expired - Fee Related
-
1996
- 1996-12-10 WO PCT/EP1996/005515 patent/WO1997021841A1/de active IP Right Grant
- 1996-12-10 DE DE59604915T patent/DE59604915D1/de not_active Expired - Lifetime
- 1996-12-10 CZ CZ981825A patent/CZ182598A3/cs unknown
- 1996-12-10 PL PL96327174A patent/PL185316B1/pl not_active IP Right Cessation
- 1996-12-10 EP EP96943075A patent/EP0866880B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9721841A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1997021841A1 (de) | 1997-06-19 |
DE19546235C2 (de) | 1997-12-11 |
PL185316B1 (pl) | 2003-04-30 |
CZ182598A3 (cs) | 1999-10-13 |
EP0866880B1 (de) | 2000-04-05 |
DE19546235A1 (de) | 1997-06-19 |
PL327174A1 (en) | 1998-11-23 |
DE59604915D1 (de) | 2000-05-11 |
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