| (19) |
 |
|
(11) |
EP 0 274 187 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
17.01.1990 Bulletin 1990/03 |
| (43) |
Date of publication A2: |
|
13.07.1988 Bulletin 1988/28 |
| (22) |
Date of filing: 22.10.1987 |
|
| (51) |
International Patent Classification (IPC)4: C22B 1/10 |
|
| (84) |
Designated Contracting States: |
|
BE DE FR IT NL |
| (30) |
Priority: |
24.12.1986 AU 9688/86
|
| (71) |
Applicants: |
|
- ELECTROLYTIC ZINC COMPANY
OF AUSTRALASIA LIMITED
Melbourne
Victoria (AU)
- COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
Campbell,
Australian Capital Territory 2601 (AU)
|
|
| (72) |
Inventor: |
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- Johnson, Alan
Dynnyrne
Tasmania (AU)
|
| (74) |
Representative: Spencer, Graham Easdale et al |
|
A.A. Thornton & CO
Northumberland House
303-306, High Holborn
London WC1V 7LE
London WC1V 7LE (GB) |
|
| |
|
| (54) |
Improvements in or relating to the fluidised-bed roasting of sulphide minerals |
(57) A process for improving the fluidising properties of material in the bed of a fluidised-bed
roaster, said material including particles in fine, intermediate, and coarse size
ranges, is characterised by increasing the proportion of material of intermediate
size range therein. The advantages that can be gained by increasing the proportion
of material in the intermediate particle size range include better gas and solid contacting,
and an improvement in the ability of the bed to carry a greater proportion of coarse
lumps as well as rejecting the fine sticky particles.