| 摘要 |
<p>PURPOSE:To save the consumption of electric power and to enhance the recovering yield of Cr by refining a solid contg. Cr as a starting material in a shaft type reaction furnace provided with a plasma torch. CONSTITUTION:A solid contg. Cr such as Cr ore pellets A, lime and coke are semicontinuously charged into a shaft type reaction furnace 1 provided with a plasma torch 2. Air or oxygen enriched air heated to a high temp. is fed from a tuyere 3, and Ar, H2, natural gas, etc. are blown from the torch 2 as working gases. The resulting plasma flame has a high temp. and reducing power, and by blowing the flame into molten slag, Cr oxide remaining in the slag is advantageously reduced to lower the Cr content of the slag. When a melt 4 gathers on the bottom of the furnace, the tap hole 5 is opened to discharge the melt.</p> |
