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US 12,522,510 B2Granted
Sodium sulfate by-product processing in lithium and battery chemical production
AssigneeHatch Ltd.
InventorsRobert John Fraser, Evangelos Stamatiou
Life of this patent
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Abstract
A process for battery chemical production, where a sodium sulfate stream is treated with an ion exchange process to provide potassium sulfate and sodium chloride. The sodium chloride may be treated with a chlor-alkali to produce sodium hydroxide for use upstream in the battery chemical production process.
Claims29
A process for battery chemical production, comprising:
- receiving at least a portion of a sodium sulfate stream;
- pre-treating the sodium sulfate stream to remove free water and/or at least one of Ni, Mn, Co, Li from the stream;
- applying an ion exchange process to the sodium sulfate stream to provide potassium sulfate and sodium chloride;
- applying a chlor-alkali process to the sodium chloride to provide sodium hydroxide;
- and
- returning at least a portion of the sodium hydroxide for use upstream in the battery chemical production process.
3 more elements
A process for battery chemical production or lithium chemical production comprising:
- receiving at least a portion of a sodium sulfate stream from a metal sulfate production process, a lithium hydroxide production process, a battery chemical precursor production process, or a process that consumes sodium hydroxide;
- pre-treating the sodium sulfate stream to remove free water and/or at least one of Ni, Mn, Co, Li from the stream;
- and
- treating the sodium sulfate stream with an ion exchange process to provide a potassium sulfate solution and a sodium chloride brine.
1 more element
An ion exchange process for producing potassium sulfate from sodium sulfate, comprising:
- receiving a sodium sulfate stream from a battery chemical or lithium chemical production process, the sodium sulfate being a by-product of battery chemical or lithium chemical production process;
- pre-treating the sodium sulfate stream to remove free water and/or at least one of Ni, Mn, Co, Li from the stream;
- subjecting the pre-treated stream to ion exchange to provide potassium sulfate and sodium chloride;
- and
- providing an exit brine from the ion exchange process, the exit brine comprising potassium sulfate and potassium chloride, and
- treating said exit brine with potassium chloride to salt out the potassium sulfate.
3 more elements
Dependencies are inferred from the claim text.