C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/351
C22B 5/08 (2006.01) C22B 5/02 (2006.01) C22B 5/12 (2006.01)
Patent
CA 1119417
ABSTRACT OF THE DISCLOSURE: A continuous process of converting non-ferrous metal sulfide concentrates to form a liquid phase which is rich in non-ferrous metal and a slag phase in an elongated horizontal reactor under a gas atmosphere which comprises S02-containing zones, in which concentrates of sulfides of copper, nickel, antimony, cobalt or lead or mixtures thereof and admixtures are charged onto a molten bath, oxidizing and reducing gases are blown into the molten bath, a phase having a high non- ferrous metal content and a phase having a low non-ferrous metal content are discharged at opposite ends of the reactor, the phases are caused to flow countercurrently in the form of substantially continuous layers to the respective outlet ends of the reactor, at least part of the oxygen is blown into the molten bath from below through nozzles spaced apart along the oxidizing zone of the reactor, the solids are charged into the reactor through a plurality of feeders, which are disposed at separate locations spaced apart along a considerable length of the reactor and are controlled independently of each other the locations and the rate at which oxygen and solids are fed are selected so that the oxygen activity in the molten bath has a maximum at the outlet end where the phase is discharged which has a high non-ferrous metal content and a low iron content, in order to promote the production of said phase, and decreases progressively in the reducing zone to a minimum at the outlet end where the slag phase is discharged which has a low non- ferrous metal content, in order to promote the production of said slag phase, gaseous and or liquid protective media are blown into the molten bath at controlled rates together with the oxygen in order to protect the nozzles and the lining which surrounds the nozzles and to assist the control of the processing temperature, and the rates at which gas is blown into the molten bath are controlled so that an agitation which is sufficient for an effective mass transfer is created in the bath whereas the layers formed by the flowing phases and the gradient of oxygen activity are substantially maintained. The process of the invention is characterized in that the gas atmosphere in the reactor is caused to flow countercurrently to the slag phase and the exhaust gas is withdrawn from the reactor at the same end as the phase which has a high non-ferrous metal content. The invention enables one to decrease the metal content of the slag phase, to improve the utilization of heat in the reactor and to permit additional heating.
322224
Fischer Peter
Schwartz Werner
Traulsen Heinrich
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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