Method for thermal treatment of nickel ore
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsHorst Weigel, Anton Spitz, deceased
Life of this patent
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Abstract
A method and mechanism for thermally processing lateritic nickel ore wherein the ore is fed through a seal, fed to a series of preheater cyclones arranged to discharge to a burner chamber with a tangential burner and the burner chamber is connected to discharge to a reduction chamber which is fed reduction gases through a water cooled supporting grate, and the still combustible reduction gases passed upwardly to the burner chamber and then through an after burner chamber whereupon the gases enter the preheater chamber to supply heat for preheating the ore to reduction temperature.
Claims9
The method of thermally processing lateritic nickel ore which comprises:
- preheating the ore in a preheating zone;
- feeding the preheated ore to a heating zone and then to a reduction zone;
- supplying a reducing gas to said reduction zone;
- feeding the reducing gas from the reduction zone and a fuel/air mixture to said heating zone whereby the still combustible reduction gases are burned in direct contact with the ore and the temperature of the ore is raised by the hot gases to a selected reduction temperature;
- and
- conducting the hot, burned reduction gases and fuel/air mixture to said preheating zone for preheating the ore.
A method for thermochemically treating nickel ore with a reduction gas, comprising the steps:
- introducing the gas into a reduction zone;
- passing said gas into a heating zone above said reduction zone through a passage and against a downward flow of said ore;
- burning a combustible portion of said gas in said heating zone in the presence of free oxygen and in contact with said ore to bring the ore to a reduction temperature;
- and
- passing said gas in a hot exhaust stream against a downward flow of said ore in a preheating zone, for preheating said ore prior to entry of said ore into said heating zone.
Dependencies are inferred from the claim text.