Method for removing halide from waelz oxide
AssigneeKorea Zinc Co., Ltd.
InventorsHeon Sik CHOI, Jae Hoon JOO
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Abstract
The present disclosure relates to a method for removing halide from halide-containing Waelz oxide. According to the method, it is possible to effectively remove halide contained in Waelz oxide, especially insoluble fluoride such as CaF2, which are difficult to remove under atmospheric pressure conditions and present as insoluble substances. Accordingly, in the process of recovering valuable metals, an additional process for adjusting the concentration of fluorine or chlorine present in the electrolyte can be omitted, and costs can be reduced.
Claims10
A method for removing halide from halide-containing Waelz oxide, comprising:
- a pressurized alkali washing step of removing halide by heating a Waelz oxide cake containing Waelz oxide together with alkali under pressurized conditions.
A method for recovering a valuable metal from Waelz oxide, comprising:
- (1) a pressurized alkali washing step of heating a cake containing Waelz oxide together with alkali under pressurized conditions;
- (2) a repulping step of agitating the cake obtained from the pressurized alkali washing step with water,
- (3) a repulped cake recovery step of recovering a cake obtained from the repulping step;
- and
- (4) a step of recovering a valuable metal through an acid leaching process and an electrolysis process.
Dependencies are inferred from the claim text.