| 摘要 |
<p>1,203,706. Magnetic separation. METALLGESELLSCHAFT A.G. and STEEL CO. OF CANADA Ltd. 22 Jan., 1969 [23 Jan., 1968], No. 3643/69. Heading B2J. A process for dressing the solids mixture discharged from a rotary kiln used for the direct reduction of oxidic iron containing materials comprises cooling the mixture and subjecting it to multi-stage screening to provide a particle size fraction of I to 10 millimetres, subjecting this fraction to a two-stage magnetic separation which is operated in one stage at a low field strength below 1000 oerstads to remove sponge iron and in the other stage at a higher field strength above 1000 oerstads to separate the mixture into a sponge iron fraction and two coke fractions one of which has a lower ash content than the other, the coke fraction having the lower ash content being recycled into the rotary kiln and the sponge iron being separated out in the stage operated at the low field strength.</p> |
