ON THE MAGNETIZING ROASTING OF THE Ni-Cr IRON ORE IN SOUTH ASIA DISTRICT BY FLUIDIZED BED
Tetsutaro Mitsuhashi, Manabu Ueno, Minoru Tanaka
Studies have been carried out on the method to utilize iron ore containning nickel and chromium. The authors reported already on the magnetizing roasting of Oeyama iron ore by hydrogen (Rep. Mech. Laboratory, MITI, vol. 8, 1954, 211). Recently a new type of the roasting equipment has become available. This is the fluidized-bed reactor. This roaster has many points of excellence compared with the ordinary roasting furnace. By this method, it is feasible to roast the fine ores in the stabilized condition, and this roaster is mainly applied to industry for the oxidizing roasting of sulphide ore.
The authors trially manufactured the fluidizing roaster for magnetizing roasting of iron ores by charcoal gas. This is the report on magnetizing roasting of laterite in South Asia district by fluidized bed. These results were as follows:
(1) Fluidizing roaster was very effective for magnetizing roasting of fine iron ore.
(2) On the over flow products:
Iron recovery was about 90% in A ore and 85% in B ore.
Iron content of the magnetic concentrates was about 60% in A ore and 50% in B ore.
Nickel recovery was almost equal to that of iron.
Nickel content of the magnetic concentrates was 1.10% in A ore and 0.75% in B ore on the average.
The magnetic seperation of chromium in ores was not good.
Minimum chromium content of concentrates was 1.0% in A ore and 2.1% in B ore.
(3) On the cyclone dusts:
Iron recovery was about 75% in both ores.
Iron content of the cyclone dusts was almost equal to the concentrates of over flow products.
Nickel content was 1.0% in A ore and 0.18% in B ore on the average.
Chromium content of concentrates was about 1.03% in A ore and 2.43% in B ore.