| 摘要 |
A process for the decomposition of chrome ore by alkaline oxidation by - mixing finely divided chrome ore with alkaline compounds (eg Na2Co3), - heating the mixture in an indirectly heated rotary kiln to between 800 and 1,200 DEG C, - introducing oxygen or gases enriched with oxygen countercurrently to the mixture, wherein - the mixture of chrome ore and alkaline compound is divided into a large number of individual streams, - each individual stream is fed into a separate indirectly heated rotary kiln, - the large number of rotary kilns is combined in the form of a bank of kilns, - the theoretical distance covered by the particles of the mixture through the rotary kiln is 5 to 30 m, and - the resulting average coverage of the inner surface of the rotary kiln is 1 to 5 kg of mixture/m<2>. |
