Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-09-18
1976-05-18
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 6, 75 26, 423 62, C22B 110
Patent
active
039574849
ABSTRACT:
An improved method for agglomerative fluid bed roasting of metal sulphide particles. The sulphide particles are fed as an aqueous slurry through the freeboard of the roaster onto the surface of a bed of roasted calcine agglomerate particles fluidized by a free oxygen-bearing gas. Slurry water is evaporated in the bed and the sulphides are roasted therein. The feed rates of sulphide, water and free oxygen-containing gas are controlled to ensure temperatures in the roaster such that fusion occurs during roasting and agglomerated calcine particles are formed with regular, rounded surfaces. Calcine particles small enough to become entrained in the roaster off-gases are readily disengaged therefrom in cyclones to provide substantially dust-free SO.sub.2 -bearing gas. A preferred practice of the method is feeding substantially the stoichiometric amount of free oxygen to convert the sulphide to SO.sub.2 and metal oxide, thereby producing on the one hand a roasted oxide calcine substantially devoid of sulphur and on the other hand an SO.sub.2 -bearing gas substantially devoid of free oxygen. The method is particularly advantageous in the roasting of pyrrhotite concentrates and other sulphide concentrates containing pyrrhotite such as those derived from the nickel-copper ores of the Sudbury Basin.
REFERENCES:
patent: 2677608 (1954-05-01), McKay
patent: 2796340 (1957-06-01), Cyr
patent: 2813015 (1957-11-01), Thornhill
patent: 2813016 (1957-11-01), Thornhill
patent: 2819157 (1958-01-01), Fischer
patent: 2930687 (1960-03-01), Thornhill
patent: 3094409 (1963-06-01), Renzoni
patent: 3661558 (1972-05-01), Heath
Agnew Kenneth Leslie
Coulter Edward Howard
Fekete Simon Otto
MacKenzie Colin Bruce
Thornhill Philip George
Hicks Richard J.
Rosenberg Peter D.
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