MXPA97006898A - Procedure to make a sparkling scoring over a stainless steel in fusion inside an electric oven - Google Patents
Procedure to make a sparkling scoring over a stainless steel in fusion inside an electric ovenInfo
- Publication number
- MXPA97006898A MXPA97006898A MXPA/A/1997/006898A MX9706898A MXPA97006898A MX PA97006898 A MXPA97006898 A MX PA97006898A MX 9706898 A MX9706898 A MX 9706898A MX PA97006898 A MXPA97006898 A MX PA97006898A
- Authority
- MX
- Mexico
- Prior art keywords
- slag
- oxide
- powder
- stainless steel
- carbon
- Prior art date
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 13
- 239000010935 stainless steel Substances 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000004927 fusion Effects 0.000 title claims description 7
- 239000002893 slag Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 20
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 12
- 239000006260 foam Substances 0.000 claims abstract description 11
- 150000004706 metal oxides Chemical group 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052799 carbon Chemical group 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims abstract description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 19
- 239000011787 zinc oxide Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910000464 lead oxide Inorganic materials 0.000 claims description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 238000005187 foaming Methods 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 3
- 229960001296 Zinc Oxide Drugs 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000460 iron oxide Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive Effects 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Abstract
The present invention relates to a process for making a foaming slag on a melting stainless steel inside an electric furnace characterized in that: a powder containing at least one metal oxide and carbon is reduced to at least one oxide in the slag contained in the powder by the reaction with the carbon to form in the slag bubbles composed essentially of metal in the metal oxide and carbon monoxide state, generating the bubbles contained in the slag a slag in the form of a foam
Description
PROCEDURE TO MAKE A SPARKLING SCORING OVER A STAINLESS STEEL IN FUSION INSIDE AN OVEN
ELECTRIC. DESCRIPTION OF THE INVENTION The present invention relates to a process for making a foaming slag on a melting stainless steel inside an electric furnace. In the field of the fusion of stainless steels in electric furnaces, the load of the furnace, of the type - of hatarra, trimmings, ferroalloys, is transformed into liquid metal thanks to the generation of electric arcs between electrodes of the furnace and said load. The steel production generates residual products, such as powders, recovered by the despol voreadores of which approximately 90% are recycled in the form of iron balls reintroduced in the electric furnace, being currently stored the remaining 10%, which - It contains too much zinc oxide. The slag is removed after the fusion. In the field of fusion of non-oxidizable steels, the principle of foaming slag is based on the reduction of iron oxide contained in the slag used. The reduction of iron oxide is carried out by injection of carbon dust into the furnace, a reduction that generates carbon monoxide. The bubbles - REF: 25576 of carbon monoxide trapped in the molten slag cause it to foam and increase its volume accordingly. The scum in the form of foam covers the end of the electrode and protects the refractories against electrical radiation, which allows an economy in the consumption of the electrode, in the electrical consumption, and in the consumption of the refractories. In the case of the fusion of stainless steels, the slag is not rich enough in iron oxide and therefore, the principle of foam slag used in the manufacture of non-stainless steels is not applicable. The object of the invention is to propose a process for generating a controlled and stable foaming slag on a melting stainless steel, inside an electric furnace. modifying the slag so that a foam is created in said slag. The subject of the invention is a method for producing a foaming slag on an iron in an electric furnace, characterized in that
- a powder is introduced into the slag which has at least one metal oxide and carbon in its composition, - at least one oxide contained in the powder is reduced by the reaction of the latter with the carbon to form in the slag bubbles composed essentially of metal in a gaseous state of metallic oxide and carbon monoxide, the bubbles contained in the slag generating a sound in the form of a stable foam. The other features of the invention are: the metal oxide is an oxide of an organic element 1. The metal oxide is chosen from zinc oxide and lead oxide. - at least part of the powder comes from powders - generated by the electric steel-making furnace. - The powder is introduced by injection under a dry fluid. - the fluid is chosen between nitrogen and argon. The description that follows will make the invention well understood. The present invention relates to a process for making a foaming slag on a stainless steel being processed in an electric furnace. According to the invention, a metal oxide and carbon in the form of a powder, metal oxide which by reduction with the carbon forms, on the one hand, a gas of the metal, is introduced into the furnace for the production of stainless steel and in the slag. metallic element of the oxide and, on the other hand, carbon monoxide, producing the bubbles generated by these gases, trapped in the slag, a slag in the form of a stable foam. According to the invention, the powder contains in its composition zinc oxide. The powder is constituted - by powders of electric furnace strongly galvanized resulting from the progressive enrichment in ZnO of the mentioned powders in the course of its recycling in the ace-rería. The use of electric oven powders, strongly galvanized, allows the use of a co product from the production of stainless steel. The zinc element of the zinc oxide, used preferentially, participates in the formation of the bubbles, since at the temperature of the slag the zinc is in the gaseous state. Zinc oxide is reduced by carbon to give gaseous zinc and carbon monoxide, which will cause foam formation in the slag according to the reaction: ZnO + C = £ >; zn + CO In an application example, the electric furnace is injected, by means of an injection machine, from 500 kg to 1,000 kg of heavily galvanized powder. The injection fluid is preferably nitrogen, to avoid the risk of explosion due to moisture in the air. According to the invention, the base slag for the preparation of stainless steels is composed of 35% to 40% SiO2; 40% to 45% CaO, 5% Cr? 0 ~; 5% of Al 203; the rest being formed by some% MnO and MgO, and less than 1% FeO. This slag does not contain practically iron oxide. Due to the reduction of zinc oxide by -carbon and the resulting gases, an increase in the thickness of the base slag is observed, reaching several tens of centimeters, covering the slag, in the form of foam, the current feeding electrode. . The foam formation in the slag obtained is controlled and stable. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, the content in the following is claimed as property:
Claims (5)
1. - Process for making a slag is pumante on a stainless steel in fusion inside an electric furnace, characterized in that: - a powder is introduced into the slag which - contains in its composition at least one metal oxide and carbon. - at least one oxide contained in the powder is reduced by the reaction of the latter with the carbon to form in the slag bubbles composed essentially of metal in the gaseous state of the metal oxide and carbon monoxide, generating the bubbles contained in the slag a slag in the form of a stable foam.
2. Method according to claim 1, characterized in that the metal oxide is an oxide of a volatile element.
3. Method according to claims 1 and 2, characterized in that the metal oxide is chosen from zinc oxide and lead oxide.
4. Method according to claims 1 and 3, characterized in that at least a part of the powder comes from powders generated by the electric steelmaking furnace.
5. Method according to claims 1 to 4, characterized in that the powder is introduced by injection under a dry fluid. 5. Process according to claims 1 and 5, characterized in that the fluid is chosen between nitrogen and argon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9611120 | 1996-09-12 | ||
| FR9611120A FR2753205B1 (en) | 1996-09-12 | 1996-09-12 | PROCESS FOR PRODUCING A FOAMING SLAG OVER A STAINLESS STEEL MELTING IN AN ELECTRIC OVEN |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9706898A MX9706898A (en) | 1998-07-31 |
| MXPA97006898A true MXPA97006898A (en) | 1998-11-09 |
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