| 摘要 |
The smelting is carried out by establishing at least one oxidation zone and at least one reduction zone in a furnace, each zone comprising a slag bath and a gas space; the gas spaces being separated by a partition; feeding metal sulphides together with fluxes, to the or each oxidation zone, and feeding oxygen or oxygen-rich gas into the slag bath in said zone to oxidise metal compounds therein and produce an off- gas containing SO2; transferring metal-oxide-bearing slag from at least one oxidation zone to at least one reduction zone; introducing coal into the or each reduction zone to reduce metal oxides therein, and produce carbon monoxide and hydrogen; introducing a controlled stream of oxygen into said zone to partly post-combust carbon monoxide and hydrogen, thereby producing heat, while leaving the gases sufficiently reduced to ensure that reduced metal is not re-oxidised; and recovering reduced metal. |
