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Aqueous chemistry of lithium production
This paper presents an overview of the aqueous chemistry found in lithium processing, in which both chloride and sulphate systems are used depending on the source or technical preference. The various simple and complex salts and their associated solubilities are examined via modelling of the relevant chemistry. Potassium being a by-product of interest, the equilibrium chemistry of potassium in chloride and sulphate solutions of sodium, potassium, magnesium and calcium is covered.
This seminar explores the chemical challenge to isolate lithium from a brine of various cations and anions using a number of separation options. At the same time, we work on a separation scheme that also separates boron and potassium at ample purities from the same mixture.
Lithium (Li), an exceptional cathode material used in rechargeable batteries, is an essential element in modern energy production and storage devices. Extraction of lithium by processing minerals, brine, or sea water produces technical-grade Li2CO3. To upgrade the purity to electrochemical grade, there are several purification processes. Diana shows the carbonation process, during which the technical-grade Li2CO3 is subjected to carbonation with gaseous CO2 at elevated temperature and pressure to solubilize the lithium as LiHCO3. LiHCO3 is then heated at 90 ⁰C to precipitate lithium as Li2CO3 with 99.95% purity.
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OLI software is used by hundreds of companies in many capital-intensive industries to address water chemistry challenges. In the development of mineral processes, OLI simulation technology often becomes mission-critical to generate cost savings and confidently assess project feasibility particularly when exploring initial concepts, working on concept development, engineering activities and commissioning,
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