Production and treatment of ferrochromium

Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

75 12, 751305, C21B 400

Patent

active

044419210

ABSTRACT:
A process for the production of ferrochromium by smelting chromite ore and in which ferrochromium fines may form a part of the feed materials, or for the further treatment of ferrochromium fines alone, in each case in the presence of a limited amount of carbonaceous reductant, is provided. The amount of reductant is generally limited to a maximum of 150% of the stoichiometric amount required for reduction of all the chromium and iron to metal or carbide form and to produce the required level of silicon in the product (normally 2 to 4%). The process is carried out by feeding the preferably premixed feed materials to a liquid slag phase in the bath of the furnace at a rate chosen to maintain the molten state and temperature of such material. Oxygen is substantially excluded from the reaction zone which is heated by a transferred arc thermal plasma. The feed materials generally include slagging agents chosen to ensure that the slag liquidus temperature and metal liquidus temperature are roughly the same or that of the slag is less than that of the metal, but in any event such that the slag phase remains liquid throughout the process.

REFERENCES:
patent: 3301669 (1967-01-01), Rathmann
patent: 3347766 (1967-10-01), Death et al.
patent: 3523021 (1970-08-01), Khitrik
patent: 3615349 (1971-10-01), Bleloch
patent: 3992193 (1976-11-01), Fey et al.
patent: 3997333 (1976-12-01), Fey
patent: 4006284 (1977-02-01), Segsworth et al.
patent: 4061492 (1977-12-01), Fey et al.
patent: 4148628 (1979-04-01), Fukunishi et al.
Chemical Engineering, "Plasma Process is Ready for Metals Recovery", (Feb. 26, 1979), pp. 75-77, (by: Peter R. Savage).
Journal of Metals, "In-Flight Plasma Reduction of Domestic Chromite", (Aug. 1981), pp. 43-49, (By: J. J. Moore, K. J. Reid, J. K. Tylko).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Production and treatment of ferrochromium does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production and treatment of ferrochromium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production and treatment of ferrochromium will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-891093

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.