| 摘要 |
<p>1410464 Reducing metal ore FIERRO ESPONJA SA 24 Jan 1974 [22 Feb 1973] 03407/74 Heading C7D Metal ore (e.g. Fe, Ni, Cu, Sn, Ti, Ba or Ca ore) is reduced in a reducing reactor using gas of composition 15-40% CO, 5-40% CO 2 , 15-50% H 2 , 10-60% CH 4 at 750-900‹ C the effluent gas being recycled to form a reducing circuit.which is topped up with hydrocarbon gas and maintained at temperature by burning to 800 to 1200‹C in a combustion chamber supplied with oxygen prior to entering the reducing reactor, a stream of gas is bled from the reducing circuit to a cooling circuit in which ore reduced in a previous cycle and contained in a cooling reactor is cooled. The cooling reactor is then emptied, charged with fresh ore and functionally exchanged with the reducing reactor i.e. reducing gas is fed to the new reducing reactor (the original cooling reactor) and a stream is bled from the new reducing to the new cooling circuit to cool reduced ore contained in the new cooling reactor (the original reducing reactor). A catalyst e.g. sponge Fe, nickel oxide or alumina may be utilized in the combustion chamber. Alternatively the reducing gas may be fed initially to the cooling circuit and a stream bled therefrom to the reducing circuit.</p> |
