Influence of technological parameters of charge preparation on reduction rate of chromuim from ore-coal briquettes

The influence of technological parameters of ore-coal charge preparation on the reduction rate of chromium during solid state carbothermal reduction process was studied. The results of the laboratory experiments on the modelling of ore-coal briquettes heating and soaking in rotary hearth furnace were presented. It was shown that under time-thermal conditions which simulate cold briquettes loading into furnace and the briquettes moving throw hot furnace zone together with hot discharging of sintered briquettes high chromium reduction rate could be achieved. The size of ore material was established to have the greatest influence on the chromium reduction rate. It was noted that low briquette strength does not allow the usage of ore-coal briquettes with bentonite in the shaft or rotary furnaces. However, the chromium reduction rate obtained and the strength of briquettes allow the process in the furnaces to be done with low load on a briquette, as in rotary hearth furnaces.