Method for manufacturing chromium-bearing pig iron

Details Method for manufacturing chromium-bearing pig iron Method for manufacturing chromium-bearing pig iron

1989-01-12

1991-01-15

Morris, Theodore

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75463, 75466, 420 34, 420428, 420583, C21B 502

Patent

active

049850750

ABSTRACT:
A method for manufacturing a chromium-bearing pig iron comprises the steps of charging cold bond pellets, iron ore and coke lumps into a blast furnace from above and blowing a gas containing more than 50% oxygen therein and tuyere nose flame temperature control agent into the blast furnace through the tuyere, the cold bond pellets being comprised of powdered chromium ore and powdered coke as principal feed materials. The cold bond pellets are manufactured by performing a mixing, a pelletizing and a curing step. The tuyere nose flame temperature control agent is a top gas, steam, water or CO.sub.2, which is used to control the flame temperature to 2000.degree. to 2900.degree. C.

REFERENCES:
patent: 3460934 (1969-08-01), Kelmar
patent: 3661555 (1972-05-01), Kusuma et al.
patent: 4106929 (1978-08-01), Saito et al.
patent: 4198228 (1980-04-01), Jordan
patent: 4381938 (1983-05-01), Claflin
patent: 4412862 (1983-11-01), Miyashita et al.
patent: 4723995 (1988-02-01), Satomi et al.
Dean, Eugene R., "Utilization of Fuel Gas by Injection Through Blast Furnace Tuyeres", Blast Furnace and Steel Plant, May 1961, pp. 417-422.
Manufacture of Stainless Steel in the Top-Blown Oxygen Converter by F. C. Langenberg, C. W. McCoy & E. L. Kern disclosed in publication, "Blast Furnace and Steel Plant", dated Aug., 1967.

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