| 摘要 |
<p>The invention relates to the reduction of ore fines, whereby said ore fines (1) are pre-heated in a multi-stage suspension-type heat exchanger (I), calcined and subsequently reduced in at least one lowest heat exchanger stage (2) by adding a reducing agent in a stream of hot gas supplied to said stage. The invention aims to ensure an economic, constant reduction of ore fines in a relatively simple but extremely reliable manner, whilst at the same time permitting the suspension-type heat exchanger to be well regulated and controlled. To this end, the principal part of the reducing thermal treatment of the ore fines is carried out in a reactor loop (8) configured in the lowest heat exchanger stage of the suspension-type heat exchanger, with subsequent cyclone separation (2a) which is performed downstream of said loop. A hot reducing gas (7) is then introduced into the ascendant hot gas stream (5). The reducing gas is produced in a separate reactor vessel allocated to the reactor loop (8).</p> |
