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US 6,682,644 B2Granted
Process for producing electrolytic manganese dioxide from geothermal brines
AssigneeMidAmerican Energy Holdings Company
InventorsJohn L. Featherstone, George Furmanski
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Abstract
This invention relates generally to a process of producing electrolytic manganese dioxide (EMD). More specifically, a method of producing EMD from geothermal brine solutions is provided. Methods for production of manganese dioxide from geothermal brines through an electrolytic process are also provided.
Claims34
A method for extracting manganese from an aqueous solution containing iron, comprising the steps of:
- extracting the manganese and iron by contacting the aqueous solution with a QL reagent, wherein said QL reagent comprises a quaternary ammonium compound, a hydrogen ion exchange reagent and an organic solvent, such that an organic phase containing the manganese and iron and an aqueous phase are formed;
- stripping the manganese and iron from the organic phase by contacting the organic phase with acid, such that the manganese and iron shift from the organic phase to the aqueous phase;
- removing the iron from the aqueous phase by oxidizing the iron, such that the iron precipitates leaving a supernatant containing the manganese;
- and
- electrowinning the supernatant, such that electrolytic manganese dioxide deposits on the anode.
2 more elements
A method for extracting manganese from an aqueous solution containing iron, comprising the steps of:
- obtaining a zinc and calcium depleted hydrochloric acid solution containing manganese and iron;
- removing the iron from the solution by oxidizing the iron, such that the iron precipitates leaving a supernatant containing manganese chloride;
- and
- electrowinning the supernatant in a hydrochloric acid bath, such that electrolytic manganese dioxide forms a deposit.
1 more element
Dependencies are inferred from the claim text.