US1136669A - Process of producing carbon-free ferrochromium. - Google Patents

Process of producing carbon-free ferrochromium. Download PDF

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Publication number
US1136669A
US1136669A US72845012A US1912728450A US1136669A US 1136669 A US1136669 A US 1136669A US 72845012 A US72845012 A US 72845012A US 1912728450 A US1912728450 A US 1912728450A US 1136669 A US1136669 A US 1136669A
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United States
Prior art keywords
chromium
aluminothermic
chrome
producing carbon
free
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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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US72845012A
Inventor
Hans Goldschmidt
Otto Weil
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GOLDSCHMIDT THERMIT Co
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GOLDSCHMIDT THERMIT Co
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Priority to US72845012A priority Critical patent/US1136669A/en
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Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/959—Thermit-type reaction of solid materials only to yield molten metal

Definitions

  • chrome-iron ore which as is well known consists essentially of chromic oxid and ferric oxid or ferrous oxid is subjected to the aluminothermic reaction, the best result to be obtained, even when using a material of high percentage and working strictly according to the rules of the art, will give a ferro-chromium with a yield of about 70 per cent. of the chromium contained in the raw material. Furthermore another disadvantage arises from the fact that it is not I, possibleto always obtain perfectly uniform results, even when using the same raw material. The reason for this peculiar fact seems'to be a dissociation taking place within thealuminothermic mixture when burning.
  • the mixture of-chrome-iron ore, chromic oxid and aluminum, (or other re ducing metals) is, with a view to further increasing the yield, subjected to a preheating process up to temperatures nearthe smelting point of the reducing metal and aluminothermic reaction.
  • a process for increasing the yield'of ture of ferro-chromium from materials con- .taining chromium which consists in adding certain amount of;chromium oxid and subjecting thismass to the aluminothermic reaction.
  • a process for 'increasing the yield of chromium in the aluminothermic manufacture of ferro-chromium from chrome-iron ore which consists in adding to the ordinary aluminothermic mixture of chrome-iron ore and reducing metal a 'certain amount of chromic oxid, preheating the mixture up to a temperature near the melting point of the reducing metal and subjecting this mass to the aluminothermic reaction.
  • a process for increasing the yield of chromium in the aluminothermic manufacture of ferro-chromium from chrome iron ore which consists in adding to the ordinary aluminothermic mixture of chrome-iron ore and reducing metal a certain amount of chromic oxid, preheating the mixture up. to red heat and subjecting this mass to the aluminothermic reaction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

" v UNITED AT PATENT OFFICE I name oonnsclmm'r Am) or'ro wmnor E-SSEN-ON-THE-BIUHVB, GERMANY, assmnons .zl'o eonnscmumr rnnnmrrcomranx, on NEW YORK, N. Y., a conrona'rxon or NEW YORK.
'rnoczss or rnonucmo cannon-FREE, rnnnocnnomxom.
No Drawing.
,To all whom it may concern Be it known that W6,'IIANS Gonoscmum'r andjo'r'ro WEIL, subjects of the King of Prussia, German Emperor, and residents of Essen-on-the-Ruhr, in the Province of the Rhine, German Empire, have jointly invented certain new and useful Improvements in Processes of Producing Carbon- -Free Ferrochromium, of which the follow- 10 ing is a spe'c'ification- Carbon-free ferro-chromium cannot be manufactured in electrical furnaces, but
only by means of the aluminothermic-process. As the yields obtained by this process are, however, comparativel unfavorable, the price of the carbon-free erro-chromium is relatively high.
If chrome-iron ore which as is well known consists essentially of chromic oxid and ferric oxid or ferrous oxid is subjected to the aluminothermic reaction, the best result to be obtained, even when using a material of high percentage and working strictly according to the rules of the art, will give a ferro-chromium with a yield of about 70 per cent. of the chromium contained in the raw material. Furthermore another disadvantage arises from the fact that it is not I, possibleto always obtain perfectly uniform results, even when using the same raw material. The reason for this peculiar fact seems'to be a dissociation taking place within thealuminothermic mixture when burning.
' Now it has been found that it is possible to highly'increase the yield of chromium from chrome-iron ore, as well as to always obtain uniform iron-chromium alloys by adding a certain percentage of oxid of chromlum to the mixture of chrome-iron 40 ore and aluminum or other reducing metal, and then subjecting this mixture to the aluminothermic reaction. By this process it is ossibleto increase the yield of chromium rom chrome-iron ore up to about 15 to 20 per cent and at the same time to produce ferro-chromium of a uniform composition. The amount of the addition of chromic oxid which of course also increases the per Specification of Letters Patent.
- preferably up to red heat and then to the chromium in-the aluminothermic manufac- In witness whereof we have hereunto set Patented Apr. 20, 1915.
' Application filed October 29,1912. seria11wc;72s,45o.
'centage of chromium in-the alloy produced may be suitably chosen according to the per: 50
' centage of chromium desired in the ferrochromium to be produced.
In the preferred form of carrying out the invention the mixture of-chrome-iron ore, chromic oxid and aluminum, (or other re ducing metals) is, with a view to further increasing the yield, subjected to a preheating process up to temperatures nearthe smelting point of the reducing metal and aluminothermic reaction.
What We claim is:
1. A process for increasing the yield'of ture of ferro-chromium from materials con- .taining chromium which consists in adding certain amount of;chromium oxid and subjecting thismass to the aluminothermic reaction.
2. A process for 'increasing the yield of chromium in the aluminothermic manufacture of ferro-chromium from chrome-iron ore which consists in adding to the ordinary aluminothermic mixture of chrome-iron ore and reducing metal a 'certain amount of chromic oxid, preheating the mixture up to a temperature near the melting point of the reducing metal and subjecting this mass to the aluminothermic reaction.
3. A process for increasing the yield of chromium in the aluminothermic manufacture of ferro-chromium from chrome iron orewhich consists in adding to the ordinary aluminothermic mixture of chrome-iron ore and reducing metal a certain amount of chromic oxid, preheating the mixture up. to red heat and subjecting this mass to the aluminothermic reaction.-
our hands in. the presence of two witn. HANS GOLDSCHMIDT. {14.8.1
OTTO W'EHJ. 1 1.5.] V
In the preselnce of;
HELEN
US72845012A 1912-10-29 1912-10-29 Process of producing carbon-free ferrochromium. Expired - Lifetime US1136669A (en)

Priority Applications (1)

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US72845012A US1136669A (en) 1912-10-29 1912-10-29 Process of producing carbon-free ferrochromium.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448882A (en) * 1943-12-13 1948-09-07 Electro Chimie Metal Method for deironing chromium ore

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448882A (en) * 1943-12-13 1948-09-07 Electro Chimie Metal Method for deironing chromium ore
US2458469A (en) * 1943-12-13 1949-01-04 Electro Chimie Metal Method for deironing chromium and manganese ores

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