Process and plant for producing calcine products
AssigneeOutotec Oyj
InventorsJoerg Hammerschmidt, Bernd Kerstiens, Peter Sturm
Life of this patent
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Abstract
A process for producing calcine products includes dead roasting a metal sulfide concentrate having a low sulfur content. The concentrate is roasted in a circulating fluidized bed at a temperature of about 950 to 1050° C. A waste gas of the fluidized bed is passed through at least one of a recuperator and a Venturi drier so as to respectively provide at least one of a preheating of at least a portion of air fluidizing the fluidized bed and a drying of at least a portion of the concentrate to be roasted. The calcine product obtained in the fluidized bed with a sulfur content of less than 1 wt-% is provided for further processing.
Claims19
A process for producing calcine products comprising:
- dead roasting a metal sulfide concentrate having a low sulfur content, the concentrate being roasted in a circulating fluidized bed at a temperature of about 950 to 1050° C.;
- passing a waste gas of the fluidized bed through at least one of:
- a recuperator so as to preheat at least a portion of fluidizing air of the fluidized bed and a Venturi drier so as to dry at least a portion of the concentrate to be roasted;
- and
- providing for further processing calcine product obtained in the fluidized bed with a sulfur content of less than 1 wt-%.
A plant for producing calcine products comprising:
- a fluidized-bed reactor configured to dead roast a metal sulfide concentrate having a low sulfur content;
- at least one of a recuperator and a Venturi drier disposed downstream of the fluidized-bed reactor in a waste gas stream of the fluidized-bed reactor and configured to recover heat of the waste gas to fluidizing air of the fluidized bed reactor, the fluidizing air being subsequently provided to at least one of the fluidized-bed reactor and the concentrate to be roasted;
- and
- a microgranulation configured to treat solids recirculated to the fluidized-bed reactor.
Dependencies are inferred from the claim text.