US3525608A - Method for increasing the chromium content of ferrochrome with low chromium content - Google Patents
Method for increasing the chromium content of ferrochrome with low chromium content Download PDFInfo
- Publication number
- US3525608A US3525608A US629890A US3525608DA US3525608A US 3525608 A US3525608 A US 3525608A US 629890 A US629890 A US 629890A US 3525608D A US3525608D A US 3525608DA US 3525608 A US3525608 A US 3525608A
- Authority
- US
- United States
- Prior art keywords
- ferrochrome
- chromium content
- chromium
- low
- content
- 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
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title description 34
- 239000011651 chromium Substances 0.000 title description 33
- 229910052804 chromium Inorganic materials 0.000 title description 32
- 229910000604 Ferrochrome Inorganic materials 0.000 title description 23
- 238000000034 method Methods 0.000 title description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 241001062472 Stokellia anisodon Species 0.000 description 12
- 239000013078 crystal Substances 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- -1 chromium iron carbides Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
Definitions
- Such material is smelted in a conventional manner into ferrochrome, controlling the carbon and silicon content of the charge such that the carbon content of the produced smelt is within the range of 4-8% and silicon content is within the range of 0.2-6.0% and that the molten product is cooled in controlled crystallization conditions, or normally cooled ferrochrome is then heat treated similarly in controlled crystallization conditions, in such a manner that the produced chromium enriched chromiurn-iron-carbide crystals on one hand and crystals containing mainly iron on the other hand exist separate in the solid material in suitable sizes, and that the crystals of the phase containing mainly chromium, after crushing and grinding, are separated by mechanical separation methods, by magnetic or electrostatic means or by means based on differences in specific gravity.
- the present invention relates to a method for increasing the chromium content of ferrochrome with low chromium content, produced from ores with a low ratio of chromium to iron.
- One of the principal characteristics of the method according to the present invention is that an ore or concentrate with a low ratio of chromium to iron is smelted in a conventional manner into ferrochrome, controlling the carbon and silicon contents of the smelt, whereupon with utilization of controlled crystallization and afterwards crushing and grinding the product it can be separated into a chromium enriched fraction and another fraction containing a major portion of iron.
- the resulting fraction containing chromium enriched chromium iron carbides can be used for the production, by suitable conventional methods, of high quality ferrochrome, or it can directly be utilized as alloying element for purposes where the carbon content is not an obstacle.
- the other fraction containing a major portion of iron can be utilized in steel works and foundries or for other suitable purposes.
- the method comprises controlling the carbon and silicon contents of the low chromium ferrochrome smelt and controlled cooling of the smelt and/or heat treatment of the cooled product in such a manner that in the low chromium ferrochrome obtained by said method the portion containing metallic iron has a low chromium content and that the crystals of this portion comprise a phase separate from the chromium enriched chromiumiron-carbide crystals.
- the controlled crystallization is carried out either by controlled cooling of the product or if the cooling has not been controlled then by additional heat treatment of the cooled product or by both of these operations in such a manner that in the obtained ferrochrome with low chromium content the crystals containing iron have a low chromium content and comprise a phase by themselves, separate from the chromium enriched chromiumiron-carbide crystals.
- These separately crystallized phases can be separated from each other, after crushing and grinding, by magnetic or electrostatic means, means based on difierencs in specific gravity or means based on other mechanical separation methods.
- the composition of the ferrochrome was:
- the slag contained 3.7% of Cr O
- the ferrochrome was cooled as follows:
- the cooled ferrochrome was crushed, ground to 100 mesh and separated by means of a low-magnetic separator.
- the non-magnetic portion 381 kg.: Percent Cr 68.8
- a method for increasing the chromium content of ferrochrome with low chromium content, produced from low chromium-ferro ratio ore by smelting enriched ferrochrome together with coke and flux materials comprising: controlling carbon and silicon content of the smelt during the smelting operation so that smelt produced has a carbon content Within the range of 4% to 8% and has a silicon content within the range of 0.2% to 6%; crystallizing the smelt produced under controlled conditions by rapidly cooling the smelt produced from a temperature near the smelting point of ferrochrome to a temperature of about 1400 C., then slowly cooling the smelt down to a temperature of about 700 C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI0930/66A FI43646B (fi) | 1966-04-12 | 1966-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3525608A true US3525608A (en) | 1970-08-25 |
Family
ID=8504847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US629890A Expired - Lifetime US3525608A (en) | 1966-04-12 | 1967-04-11 | Method for increasing the chromium content of ferrochrome with low chromium content |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3525608A (fi) |
| FI (1) | FI43646B (fi) |
| NO (1) | NO119951B (fi) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101310A (en) * | 1975-03-20 | 1978-07-18 | Wisconsin Alumni Research Foundation | Micron sized spherical droplets of metals and method |
| US5123957A (en) * | 1988-11-11 | 1992-06-23 | Nkk Corporation | Method for manufacturing low carbon ferrochrome with high chromium content |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2031947A (en) * | 1933-09-20 | 1936-02-25 | Haglund Ture Robert | Process for the refining of alloys |
| US2370608A (en) * | 1942-01-08 | 1945-02-27 | Marvin J Udy | Metallurgy |
| US3301669A (en) * | 1964-02-27 | 1967-01-31 | Vanadium Corp Of America | Production of a high chromium containing ferrochrome |
-
1966
- 1966-04-12 FI FI0930/66A patent/FI43646B/fi active
-
1967
- 1967-04-04 NO NO167571A patent/NO119951B/no unknown
- 1967-04-11 US US629890A patent/US3525608A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2031947A (en) * | 1933-09-20 | 1936-02-25 | Haglund Ture Robert | Process for the refining of alloys |
| US2370608A (en) * | 1942-01-08 | 1945-02-27 | Marvin J Udy | Metallurgy |
| US3301669A (en) * | 1964-02-27 | 1967-01-31 | Vanadium Corp Of America | Production of a high chromium containing ferrochrome |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101310A (en) * | 1975-03-20 | 1978-07-18 | Wisconsin Alumni Research Foundation | Micron sized spherical droplets of metals and method |
| US5123957A (en) * | 1988-11-11 | 1992-06-23 | Nkk Corporation | Method for manufacturing low carbon ferrochrome with high chromium content |
Also Published As
| Publication number | Publication date |
|---|---|
| NO119951B (fi) | 1970-08-03 |
| FI43646B (fi) | 1971-02-01 |
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