铝盐锂吸附剂.pdfVIP

Adsorption and its Applications in Industry and Environmental Prot巳ctlOn Studies in Surface Science and Catalysis , Vo l. 120 A. Dabrowski (Editor) 621 。 1998 EIsevier Scicnce B.V. All rights r 巳served. Aluminium hydroxide as selective sorbent of lithium salts from brines and technical solutions V.P .Isupova , N.P.Kotsupalob , A. P.Nemudrya , L.T.Menzeresb alnstitute of Solid State Chemistry and Mechanochemistry , Kutateladze-18 , Novosibirsk , 630128 , Russia bEkostar-Nautech Company, B. Chmelnitsky , 2 , 630075 , Novosibirsk , Russia The disordered aluminium hydroxide and the chloride of the double hydroxide of lithium and aluminium (LADH-Cl) synthesized 0日 the basis of the former species are capable of extraction lithium selectively from complex salt chloride systems while the well crystalline compounds possess these properties to a lesser extent. The formation of LADH-Cl from aluminium hydroxide , desorption and sorption of lithium chloride are connected with the processes of its intercalation- deintercalation in the layered matrix. These processes can be described by the following scheme: LiCl + 2Al(OHh + mHzO 一一→ LiCl. 2Al(OH)s. mHzO; LiCl. 2Al(OH)s. mHzO + HzO 一一~ x LiCl + (l-x)LiCl . 2Al(OHh . qHzO; x LiCl(brines) + (l-x)LiCl . 2Al(OH)s. qHzO 一一→ LiCl . 2Al(OHh . m日zO Desorption occurs in the aqueous medium and sorption takes place during the treatment of the sorbent with lithium-containing brine. These sorbents are specific inorganic ones working in the chloride systems within the pH range 3 < pH < 8. 1丑 alkali media at pH > 8 LADH- Cl is transformed into the double aluminium-lithium hydroxide LADH or its carbonate form LADH-C03. Bo