Process of producing a mixture of iron ore and low-temperature coke

Abstract

Granular coal and preheated granular iron ore are charged into a low-temperature carbonization reactor, in which temperatures in the range from 800 to 1050 ° C. are produced by supplying gas containing oxygen and by partial oxidation of the components of the coal. In the low-temperature carbonization reactor, the granular solids are maintained in a turbulent movement. From the upper region of the reactor, hot exhaust gas is supplied to a solids separator. The granular iron ore is preheated by means of the hot exhaust gas and hot, granular mixture of iron ore and low-temperature coke is withdrawn as product from the reactor and/or from the separator. The low-temperature carbonization reactor may be designed as fluidized-bed reactor or as pneumatic conveyor section. The granular mixture of iron ore and low-temperature coke is suitable e.g. for a melt reduction process.

1 . A process of producing a hot, granular mixture of iron ore and low-temperature coke, characterized in that granular coal and preheated granular iron ore are charged into a low-temperature carbonization reactor, in which temperatures in the range from 800 to 1050° C. are produced by supplying gas containing oxygen and by partial oxidation of the components of the coal, the granular solids being maintained in a turbulent movement and being supplied from the upper region of the reactor to a solids separator from which a hot exhaust gas is withdrawn, that the granular iron ore is preheated by means of the hot exhaust gas, and that a hot, granular mixture of iron ore and low-temperature coke is withdrawn as product from the reactor and/or from the separator.  
     
     
         2 . The process as claimed in  claim 1 , characterized in that the low-temperature carbonization reactor is designed as fluidized-bed reactor or as pneumatic conveyor section.  
     
     
         3 . The process as claimed in  claim 1  or  2 , characterized in that the pressure in the low-temperature carbonization reactor lies in the range from 1 to 10 bar.  
     
     
         4 . The process as claimed in  claim 1  or any of the preceding claims, characterized in that highly volatile coal is supplied to the low-temperature carbonization reactor.  
     
     
         5 . The process as claimed in  claim 1  or any of the preceding claims, characterized in that the product of iron ore and low-temperature coke has a weight ratio Fe:C of 1:1 to 2:1.  
     
     
         6 . The process as claimed in  claim 1  or any of the preceding claims, characterized in that the granular mixture of iron ore and low-temperature coke is introduced into a melt reduction process.