Concentration of Iron Oxides by Flotation From Gossan Ore Tailings

Abstract

AbstractGossan ore originates from weathering sulfide orebodies, predominantly pyritic. Reserves at Cerro Colorado, Riotinto, amount to 20 million 1. In other zones of southern Spain, there are several million tons each of surface oxidized ores. Concentration of iron oxides in gossan ore tailings (from cyanidation) by cationic froth flotation has been studied on a laboratory scale. About 50% of the iron content of the gossan ore tailings (45% iron, 22% silica) is recoverable as concentrate by a rougher flotation; 27% of the iron is in the middlings from the scavenger cells. These middlings are recycled to the rougher step, and only 23 % sent to tailings. The concentrate contains 57% iron, and 4.7% silica. A later pelletization step produces final pellets with high iron (64%) and 5% silica. Simultaneously, the behavior of the non-ferrous metals, such as lead, silver and arsenic, during flotation has been determined. These elements are concentrated with the iron oxides. Resume Le minerai de Gossan a ete for...