Fluidized bed roasting process

Details Fluidized bed roasting process Fluidized bed roasting process

1996-04-29

1998-09-08

Simmons, David A.

Specialized metallurgical processes, compositions for use therei

Processes

Consolidating metalliferous material by agglomerating,...

75746, 75770, 75754, 148514, C22B 500

Patent

active

058039490

ABSTRACT:
A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount of no less than about 30% of the concentrate falls in a size range of from about 100 to about 420 microns. The minimum amount preferably falls in the range of from about 35% to about 40%. In one embodiment of the invention the particle size distribution is controlled by maintaining the amount of lead in the concentrate in a range from about 3% to about 4%, preferably 3.7% to about 3.8%. In another embodiment the particle size distribution is controlled by using a pelletized feed or by the combination of the steps of using a pelletized feed and regulating the lead content of the concentrate.

REFERENCES:
patent: 2779671 (1957-01-01), Fassotte
patent: 4367153 (1983-01-01), Seiver et al.
patent: 5460765 (1995-10-01), Derdall et al.
1. Article entitled "The Use of Additives in the Pellitizing Process" from publication entitled Agglomeration of Iron Ores, by D.F. Ball et al; published by American Elsevoir Publishing Company, New York, 1973.
2. Article entitled "Sherbrooke's new roasting technique" by Stanley H. Dayton; Metal Mining and Processing, Jan./64; pp. 38-42.
3. Paper entitled "Metallurgie Hoboken-Overpelt Process For Roasting Zinc Concentrates In a Fluid Bed" by R. Denoiseux et al, 1980.

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