| 摘要 |
<p>A method and apparatus for the reduction and fuming of tin concentrates, tin slags and other tin bearing materials in a closed submerged arc furnace provided with a stirrer which acts to stir molten slag in the furnace to produce a vortex acting to transfer hot slag from the vicinity of the tips of the furnace electrodes to the vortex region, the furnace being constructed to permit carbonaceous material to be fed into the region of the vortex and to enable gas to be taken off from the furnace to a gas cleaning system. The apparatus is provided additionally with a gas inlet in the vicinity of the vortex region and a secondary combustion chamber in which gas from the furnace is oxidised and thereafter returned to the furnace, the object of the invention being to obtain high thermal efficiency, high metal recovery, efficient reagent utilisation and a minimum of gaseous pollution emission.</p> |
