Recovery of Lithium Carbonate from Dilute Li-Rich Brine via Homogenous and Heterogeneous Precipitation

作者：Giuseppe Battaglia, Leon Berkemeyer, Andrea Cipollina, José Luis Cortina, Marc Fernández de Labastida, J. López, Daniel Winter · 发表于：Industrial & Engineering Chemistry Research · 年份：2022 · DOI：10.1021/acs.iecr.2c01397 · 被引用次数：111 · 研究领域：Extraction and Separation Processes、Advancements in Battery Materials、Recycling and Waste Management Techniques

An extensive experimental campaign on Li recovery from relatively dilute LiCl solutions (i.e., Li+ ∼ 4000 ppm) is presented to identify the best operating conditions for a Li2CO3 crystallization unit. Lithium is currently mainly produced via solar evaporation, purification, and precipitation from highly concentrated Li brines located in a few world areas. The process requires large surfaces and long times (18–24 months) to concentrate Li+ up to 20,000 ppm. The present work investigates two separation routes to extract Li+ from synthetic solutions, mimicking those obtained from low-content Li+ sources through selective Li+ separation and further concentration steps: (i) addition of Na2CO3 solution and (ii) addition of NaOH solution + CO2 insufflation. A Li recovery up to 80% and purities up to 99% at 80 °C and with high-ionic strength solutions was achieved employing NaOH solution + CO2 insufflation and an ethanol washing step.