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Resources 2022, 11, 89 4 of 12 Figure 1. Experimental flow diagram. 2.2. Method Two experiments were carried out separately on brine and bittern since the concen- tration of Mg in brine and bittern was 475.30 ppm and 13,527 ppm, respectively. Both experiments were conducted at room temperature without heating and with a precipita- tion process time of 5 min, based on the previous study [14]. In this experiment, the main things observed were the percentage of lithium ions and magnesium ions still present in the filtrate and the Mg/Li ratio in the filtrate. The flow diagram of the experiment is shown in Figure 1. Brine water without evaporation was added with sodium silicate with a varying mole ratio of sodium silicate to magnesium of 0.31, 0.63, 0.94, 1.25, 1.56, 1.88, and 2.19. The fil- tration process separated the filtrate (F1) and the precipitate (S1). Next, the solid precipi- tates (S1) were leached with distilled water at a volume of 200 mL for 30 min. In the case of bittern, the addition of sodium silicate was varied based on the mole ratio proportion to precipitate magnesium ion, which was 0.0, 0.62, 0.74, 0.87, 1.00, 1.11, and 1.24. For the comparison between bittern and brine water, the addition of sodium silicates was set up to a 1.25 mole ratio of sodium silicate to magnesium ion. The precipitation process time was set at 5 min at room temperature, with the stirring speed at 300 rpm. A white precipitate of magnesium silicate (S1) was then separated from the filtrate (F1). The solid (S1) was then leached with distilled water with a solid/water ratio of about 1.5 for about 30 min to remove the lithium ions that may have occurred in the solid (S1). The filtrate (F2) was separated from the precipitate (S2) for further characterization. The process of leaching instead of washing was preferred in this observation because either magnesium or lithium ions might dissolve when the solid precipitates were mixed with distilled water.PDF Image | Separation of Magnesium and Lithium from Brine Water
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