XRD-investigations of the mechanism of lithium sorption from the separated liquid of the Pauzhetskaya geothermal power plant (Kamchatka) by modified zeolites

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Author: Belova, T P
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2019
• Subjects: Kamchatka
• Online Access: http://dx.doi.org/10.1088/1755-1315/367/1/012004; https://iopscience.iop.org/article/10.1088/1755-1315/367/1/012004/pdf; https://iopscience.iop.org/article/10.1088/1755-1315/367/1/012004

Abstract The process of extracting lithium ions from the separated liquid of the Pauzhetskaya Geothermal Power Plant by modified zeolites of the Yagodninsky deposit of Kamchatka region has been experimentally studied. The four most characteristic reflexes at 2θ, deg.: 25.68, 27.11, 27.43 and 27.68 were singled out on the basis of the study of the solid phase composition of the modified sorbent on the X-ray diffractometer RIGAKU Ultima-IV (Japan). It has been established that there occurs displacement of the position of the reflexes with a change in the interplanar distance and a change of the peak width value at the semi-height (FWHM) in the process of modification. The predominant mechanism is the ion exchange H + →Me + : the calcium and magnesium ions that have been preserved in the zeolite structure during acidic treatment are exchanged for sodium and potassium ions Me 2+ →2Me + . The total sorption capacity of the modified sorbent during sorption from an technogenic solution under dynamic conditions is 0.31 mmol/g.