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5. Results and Discussions 5.1. Batch experiments 5.1.1. Determination of silicic acid concentration Adsorption of Li to λ-MnO2 is strongly prevented. Therefore, silicic acid should be removed from geothermal water. First, silicic acid concentration was determined by spectrophotometry and inductively coupled plasma atomic emission spectrometry (ICP-AES). The former is for monosilicic acid concentration and the latter is for total silicic acid concentration. The monosilicic acid concentration was 182 ~ 188 ppm (SiO2) and the total silicic acid was 192 ppm (SiO2), suggesting that silicic acid existed mainly as monosilicic acid in the geothermal water sample. 5.1.2. Removal of silicic acid from geothermal water In this study, in order to remove silicic acid from geothermal water, the coprecipitation method with ferric hydroxide (Fe(OH)3) was used. It is well known that silicic acid can be adsorbed on Fe(OH)3 above pH 8. As a source of Fe(OH)3, a commercial iron sulfate polymer solution (Nittetsu Kogyo) was used. One to five cm3 of the iron sulfate polymer solution was added into 100 cm3 geothermal water and the pH was adjusted above 9 because of enough growth of Fe(OH)3 colloid particles. The pH was checked using a pH paper. After the filtration of the suspended solution with 0.45 μm membrane filter, silicic acid concentration in filtrate was determined by ICP-AES. Figure 6 shows the effect of volume of the iron sulfate polymer solution added on removal of silicic acid. The total silicic acid concentration decreased from 254 ppm to 6 ppm. Coprecipitation of silicic acid with Fe(OH)3 is based on the formation of a Fe-O-Si(OH)3 bond. Daoud, Yokohama, Yoshizuka 300 250 200 150 100 50 0 0 100 200 300 400 500 Amount of [FeSO4 aq] ml Figure 6 : Effect of volume of iron sulfate polymer solution (coagulant) added to 10 L of geothermal water on removal of silicic acid 5.1.3. Determination of Li in geothermal water The concentration of Li, which is a target element, was measured by ICP-AES. Averagely, it was 4.16 ppm. In addition, the Li concentration after removal of silicic acid from geothermal water was also measured. No loss of Li was confirmed by the coprecipitation of silicic acid with Fe(OH)3, described above. [SiO2] ppmPDF Image | Recovery of Lithium from Geothermal Water
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Daoud, Yoshizuka - 2020 - A Study on Recovery of Lithium from Geothermal Water and Study of Assal geothermal field.pdfDIY PDF Search: Google It | Yahoo | Bing
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