AT61683B - Process for increasing the yield of chromium in the aluminothermic production of ferrochrome from chrome iron stone. - Google Patents
Process for increasing the yield of chromium in the aluminothermic production of ferrochrome from chrome iron stone.Info
- Publication number
- AT61683B AT61683B AT61683DA AT61683B AT 61683 B AT61683 B AT 61683B AT 61683D A AT61683D A AT 61683DA AT 61683 B AT61683 B AT 61683B
- Authority
- AT
- Austria
- Prior art keywords
- chromium
- ferrochrome
- yield
- iron stone
- chrome iron
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 18
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 17
- 239000004575 stone Substances 0.000 title claims description 10
- 229910052742 iron Inorganic materials 0.000 title claims description 9
- 229910000604 Ferrochrome Inorganic materials 0.000 title claims description 8
- 229910052804 chromium Inorganic materials 0.000 title claims description 8
- 239000011651 chromium Substances 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 title claims description 3
- 239000000203 mixture Substances 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 5
- 238000007133 aluminothermic reaction Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
Landscapes
- Glass Compositions (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Erhöhung der Ausbeute an Chrom bei der aluminothermischen Herstellung von Ferrochrom aus Chromeisenstein.
Kohlenstoffreies Ferrochrom ist im elektrischen Ofen nicht herstellbar, sondern nur auf aluminothermischem Wege. Da die auf diesem Wege erhaltenen Ausbeuten aber verhältnismässig recht ungünstig sind, so stellte sich der Preis des kohlenstoffreien Ferrochroms bisher verhältnismässig hoch.
Wird nämlich Chromeisenstein, der im wesentlichen aus Chromoxyd und Eisenoxydul bzw.-oxyd besteht, der aluminothermischen Reaktion unterworfen, so gelingt es im besten Falle, selbst wenn man hochprozentiges Material benutzt und alle Vorsichtsmassregeln einhält, ein Ferrochrom zu erhalten mit einer Ausbeute von etwa 700/0 des in dem Ausgangsstoffe enthaltenen Chroms. Hiebei tritt aber auch noch der Übelstand ein, dass es nicht gelingt, immer vollkommen gleichmässige Ergebnisse zu erzielen, selbst bei Verwendung desselben Ausgangsmateriales ; die Gründe hiefür sind vielleicht in einer Entmischung des abbrennenden Materiales zu suchen.
Es ist nun gefunden worden, dass man die Ausbeute an Chrom aus dem Chromeisenstein wesentlich erhöhen und dabei stets gleichmässige Ferrolegierungen erhalten kann, wenn man dem Gemisch von Chromeisenstein und Aluminium einen gewissen Prozentsatz an Chromoxyd zusetzt und erst diese Mischung der aluminothermischen Reaktion unterwirft. Hiedurch gelingt es, die Ausbeute an Chrom aus dem Chromeisenstein um etwa 15 bis 20% zu erhöhen und gleichzeitig stets Ferrochrom von gleichmässiger Zusammensetzung zu gewinnen.
Der Zusatz an Chromoxyd, durch den selbstverständlich auch der Chromgehalt der
EMI1.1
gehalte des herzustellenden Ferrochroms, gewählt werden.
Besonders gute und gleichmässige Ausbeuten an dem im Chromeisenstein enthaltenen Chrom erhält man, wenn man das Gemisch von Chromeisenstein, Chromoxyd und Aluminium einer Vorwärmung, etwa bis auf Rotglut, und das einer solchen Vorwärmung ausgesetzte Gemisch der aluminothermischen Reaktion unterwirft.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for increasing the yield of chromium in the aluminothermic production of ferrochrome from chrome iron stone.
Carbon-free ferrochrome cannot be produced in an electric furnace, but only in an aluminothermic way. However, since the yields obtained in this way are relatively unfavorable, the price of carbon-free ferrochrome has been relatively high up to now.
If chromium iron stone, which consists essentially of chromium oxide and iron oxide or oxide, is subjected to the aluminothermic reaction, in the best case it is possible to obtain ferrochrome with a yield of about 700, even if one uses high-percentage material and observes all precautionary measures / 0 of the chromium contained in the starting materials. Here, however, there is also the disadvantage that it is not possible to always achieve completely uniform results, even when using the same starting material; the reasons for this are perhaps to be sought in a segregation of the burning material.
It has now been found that the yield of chromium from the chrome iron stone can be substantially increased and uniform ferroalloys can always be obtained if a certain percentage of chromium oxide is added to the mixture of chrome iron stone and aluminum and only this mixture is subjected to the aluminothermic reaction. This makes it possible to increase the yield of chromium from the chrome iron stone by about 15 to 20% and at the same time to always obtain ferrochrome of a uniform composition.
The addition of chromium oxide, which of course also increases the chromium content of the
EMI1.1
contents of the ferrochrome to be produced are selected.
Particularly good and uniform yields of the chromium contained in the chrome iron stone are obtained if the mixture of chrome iron stone, chromium oxide and aluminum is preheated, for example to red heat, and the mixture subjected to such preheating is subjected to the aluminothermic reaction.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE61683X | 1912-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT61683B true AT61683B (en) | 1913-10-25 |
Family
ID=5631058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT61683D AT61683B (en) | 1912-07-05 | 1912-12-17 | Process for increasing the yield of chromium in the aluminothermic production of ferrochrome from chrome iron stone. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT61683B (en) |
-
1912
- 1912-12-17 AT AT61683D patent/AT61683B/en active
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