Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia



Advanced Search

Chemistry for Sustainable Development

2017 year, number 4

Sorption of Indium over Modified Montmorillonite in Dynamic Mode

K. L. TIMOFEEV, G. I. MAL’TSEV, A. V. SVIRIDOV, and A. V. USOL’TSEV
Uralelektromed JSC, Verkhnyaya Pyshma, Russia
E-mail: mgi@elem.ru
Keywords: sorption, indium, diffusion, dynamic mode, montmorillonite
Pages: 404-409

Abstract

A method for the selective removal of indium from solutions (sol.) of acid leaching of Waelz zinc oxide (0.02–0.1 g/dm3 In) was proposed. It is an alternative technique for extraction. Adsorption over modified montmorillonite that is the Меtоsol reagent (reag.) in dynamic mode allows maximally implementing the reagent exchange capacity with the optimum cycle of sorption/desorption operations. Adsorption of iron (II) and zinc ions in static mode was detected. It is driven by the formation of intermolecular bonds with the developed surface of modified aluminosilicate. The formation of a stationary front of indium ion sorption from a polycomponent solution over the Меtоsol mineral sorbent due to predominant adsorption of In3+ compared to Fe2+ and Zn2+ was found in dynamic mode. The latter cations are replaced by In3+ ions that form chelates with ionogenic groups of di(2-ethylhexyl)phosphoric acid. Output curves of sorption of In ions at unit load Vsol/Vreag = 1–2.7 h–1 and temperatures of 298–328 K are mainly S-shaped. The inflection point is shifted to the low-value range of the specific volume of the past solution (Vsol/Vreag), which indicates slowing down the ion diffusion rate in sorbent. Indium ions passing into the filtrate comes much earlier (Vsol(1)/Vsol = 3.33–0.66), the width of the chromatographic front (ΔVsol /Vreag = 12.1–12.35) increases, the full dynamic exchange capacity (FDEC = 0.572–0.237 µmol-eq/g) and the utilization rate of the resin bed are decreased with increasing the linear rate (ω0.5) of the transmission of the eluent through a column in the range 4.78 to 12.74 cm/h. The width of the chromatographic front (ΔVsol /Vreag = 12.1–10.24) decreases; the full dynamic exchange capacity (FDEC = 0.572–1.293 mol-eq/g) and the utilization rate of the resin bed (η = 0.226–0.256) are increased, which testifies monitoring the process of sorption of indium by mixed diffusion. The Меtоsol reagent allows selectively extracting indium from production solutions in dynamic mode.

DOI: 10.15372/CSD20170410