| 摘要 |
PCT No. PCT/GB92/02188 Sec. 371 Date May 23, 1994 Sec. 102(e) Date May 23, 1994 PCT Filed Nov. 26, 1992 PCT Pub. No. WO93/11084 PCT Pub. Date Jun. 10, 1993.A rotary kiln (10) is employed which is inclined downwardly from its charge end (12) to its discharge end (14) and has a maximum length to breadth ratio of 5:1. The interior space of the kiln (10) is heated by means of at least one burner (B1, B2) directed into the kiln from one end thereof to a substantially constant elevated process temperature. Material is fed into the kiln (10) so that it occupies a maximum of 10% of the cross-sectional area of the internal space of the kiln (10) at the charge end (12). Upon entering the kiln the material is subjected almost immediately to the required process temperature. As it moves along the bottom of the kiln (10) from the charge to the discharge end (14), heat transfer to the material is primarily by radiation from the combustion space and from the lining of the kiln (10). |
