Boron extraction using selective ion exchange resins enables effective magnesium recovery from lithium rich brines with minimal lithium loss
نویسندگان
چکیده
Magnesium hydroxide is a commodity chemical, produced in almost pure form from seawater through precipitation. Even though Li brines contain high concentrations of Mg2+ cations, the precipitation Mg(OH)2 them not common. Rather it typically coprecipitated with other salts and becomes waste. The crystallization chemical-grade Li+ rich brine that contained 3.1 g/L 1.3 Li+, was investigated by means NaOH CaO addition. Direct leads to considerable loss impure crystals due uptake into crystal cake. In order increase sedimentation rate decrease loss, boron extraction step introduced, which consisted initial polishing using Amberlite IRA743. It possible extract B below ICP detection limit native salt lake selectively regenerate ion exchangers for repetitive cycles. Upon boron, rate, increased while decreased 13.7 ± 1.2 1.5 0.4%. Precipitation as an alkalizing agent generated mixture between 6.7 0.8 3.8 0.7%. When boron-free alkalized NaOH, degree crystallinity structure verified XRD purity 95 2% solid obtained. water intake presence associated hydroboracite intercalation within brucite. expected that, if present intercalation, this would be disrupted more easily ultrasound, potentially resulting d-spacings. Concluding, subsequent Mg removal steps result production 95% leaving lithium precipitation, thereby bringing second attractive product processing.
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ژورنال
عنوان ژورنال: Separation and Purification Technology
سال: 2021
ISSN: ['1873-3794', '1383-5866']
DOI: https://doi.org/10.1016/j.seppur.2021.119177