Processing of cobaltous sulpha/dithionate liquors derived from cobalt resource
AssigneeRocher Manganese, Inc.
InventorsNorman Chow, Joey Chung-Yen Jung, Anca Mihaela Nacu, Douglas Dale Warkentin
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Abstract
A process for water removal and/or recycling of sodium sulfate and/or sodium dithionate containing liquors derived from processing cobalt resource material essentially free of lithium comprising the steps of precipitation of cobalt as cobaltous carbonate or cobaltous hydroxide followed by removal thereof from the liquor, crystallization of sodium sulfate and sodium dithionate and removal of the crystals, followed by heating of the crystals to anhydrous sodium sulfate, sulphur dioxide and water and then separating the anhydrous sodium sulfate.
Claims50
A process of water removal and/or recycling from sodium sulphate and sodium dithionate containing liquor derived from processing cobalt resource material essentially free of lithium, comprising the steps of:
- a. precipitation of cobalt as cobaltous carbonate in whole or in part followed by its removal in whole or in part from the liquor by centrifugation or filtration;
- b. crystallization of sodium sulphate and sodium dithionate to separate the majority of sodium sulphate and sodium dithionate from the liquor;
- c. heating of the sodium sulphate and sodium dithionate crystals to form anhydrous sodium sulphate, sulphur dioxide and water;
- and
- d. separation of anhydrous sodium sulphate from the sulfur dioxide and water.
A process of water removal and/or recycling from sodium sulphate and sodium dithionate containing liquor derived from processing cobalt resource material containing lithium, comprising the steps of:
- a. precipitation of cobalt as cobaltous carbonate in whole or in part and lithium in whole or in part as lithium carbonate followed by their removal in whole or in part from the liquor by centrifugation or filtration;
- b. crystallization of sodium sulphate and sodium dithionate to separate the majority of sodium sulphate and sodium dithionate from the liquor;
- c. heating of the sodium sulphate and sodium dithionate crystals to form anhydrous sodium sulphate, sulfur dioxide and water;
- and
- d. separation of anhydrous sodium sulphate from the sulfur dioxide and water.
A process of water removal and/or recycling from sodium sulphate and sodium dithionate containing liquor derived from processing cobalt resource material essentially free of lithium, comprising the steps of:
- a. precipitation of cobalt as cobaltous hydroxide in whole or in part followed by its removal in whole or in part from the liquor by centrifugation or filtration;
- b. crystallization of sodium sulphate and sodium dithionate to separate the majority of sodium sulphate and sodium dithionate from the liquor;
- c. heating of the sodium sulphate and sodium dithionate crystals to form anhydrous sodium sulphate, sulphur dioxide and water;
- and
- d. separation of anhydrous sodium sulphate from the sulphur dioxide and water.
A process of water removal and/or recycling from sodium sulphate and sodium dithionate containing liquor derived from processing cobalt resource material containing lithium, comprising the steps of:
- a. precipitation of cobalt as cobaltous hydroxide in whole or in part followed by its removal in whole or in part from the liquor by centrifugation or filtration;
- precipitation of lithium as lithium carbonate in whole or in part from the cobaltous hydroxide removed liquor of a, followed by its removal in whole or in part from the liquor by centrifugation or filtration;
- b. crystallization of sodium sulphate and sodium dithionate to separate the majority of sodium sulphate and sodium dithionate from the liquor;
- c. heating of the sodium sulphate and sodium dithionate crystals to form anhydrous sodium sulphate, sulphur dioxide and water;
- and
- d. separation of anhydrous sodium sulphate from sulphur dioxide and water.
Dependencies are inferred from the claim text.