| 摘要 |
1410548 Treating ores; copper sulphide; iron oxide METALLGESELLSCHAFT AG and DEUTSCHE BABCOCK & WILCOX AG 4 Sept 1973 [28 Oct 1972] 41607/73 Heading C1A [Also in Divisions C7 and F4] Finely-divided solids, e.g. ores or ore concentrates, optionally mixed with fuels, are supplied from bin 1, Fig. 1, via a metered weigh belt conveyer 2 and metering rolls 3 to a proportioning device 4; a mixture of air from blower 10 and gas containing a high concentration of free oxygen from a cold vaporizer 11 is heated in exchanger 12 and also introduced into the proportionating device 4 to form a gas-solids suspension, the temperature being maintained below the ignition point of the solids. The suspension is discharged through concentric jets into a mixing chamber 5 and then accelerated through a nozzle constriction 18 to a vertical combustion passage 6. The suspension is ignited and the reaction is almost complete before the reaction flame reaches cyclone chamber 7. Gaseous and molten products are separated in the cyclone, the collected molten film passing through a secondary chamber 8 to a settler 9, which may be divided into two chambers, to separate materials of differing specific gravities, e.g. matter from slag; the gaseous products are deflected twice through 90 degrees in chamber 8 to separate entrained metallic droplets and then cooled to condense volatilization products. In examples, copper ore concentrates are treated to obtain copper matte; iron pyrites are treated to obtain a melt which may be turned into granules of iron oxidetogether with silica, calcium oxide etc.; a carbonaceous retort residue is treated to provide a melt containing iron, silica and other oxides, e.g. alumina, magnesia and calcium oxide. |
