| 摘要 |
<p>Sponge iron is produced by direct reduction of iron ore mixed with a carbonaceous reducing agent with or without a sulphur-combining agent such as lime or dolomite in a rotary kiln into which a suspension of coal e.g. bituminous coal lumps in a free oxygen-containing carrier gas e.g. air is injected through the core duct of a pair of coaxial tubes at the discharge end, while a similar carrier gas (air) is injected through the annulus e.g. to maintain the inner tube cooled below 400 DEG C. A third coaxial tube may be provided for heating oil during starting-up. The coal-air suspension preferably contains 1 to 3 cubic metres of air per Kg of coal.</p> |
