Process and plant for the heat treatment of fine-grained mineral solids
AssigneeOutotec Oyj
InventorsEdgar Gasafi, Guenter Schneider, Michael Missalla
Life of this patent
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Abstract
A process for heat treatment of fine-grained mineral solids includes passing fine-grained mineral solids through a flash reactor so as to contact the fine-grained mineral solids with hot gases in the flash reactor at a temperature of 450 to 1500° C. so as to obtain hot solids. The hot solids arc passed through a residence time reactor at a temperature of 500 to 890° C. The hot solids are withdrawn from the residence time reactor after a residence time of 1 to 600 minutes. A waste gas of the residence time reactor is recirculated to at least one of the flash reactor and a preheating stage.
Claims22
1-21. (canceled)
A process for heat treatment of fine-grained mineral solids, the process comprising:
- passing fine-grained mineral solids through a flash reactor so as to contact the fine-grained mineral solids with hot gases in the flash reactor at a temperature of 450 to 1500° C. so as to obtain hot solids;
- passing the hot solids through a residence time reactor at a temperature of 500 to 890° C., the hot solids being withdrawn from the residence time reactor after a residence time of 1 to 600 minutes;
- and
- recirculating a waste gas of the residence time reactor to at least one of the flash reactor and a preheating stage.
A plant for the heat treatment of fine-grained mineral solids, the plant comprising:
- a flash reactor configured to have the fine-grained mineral solids passed therethrough at a temperature of 450 to 1500° C. so as to obtain hot solids;
- and
- a residence time reactor configured to have the hot solids passed therethrough at a temperature of 500 to 890° C.;
- and
- a return conduit configured to recirculate a waste gas of the residence time reactor to at least one of the flash reactor and a preheating stage.
Dependencies are inferred from the claim text.