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Facilitated transport of germanium from acidic medium through supported liquid membrane using Cyanex 301 as mobile carrier

Kamran Haghighi Hossein, Irannajad Mehdi, Moradkhani Davood

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

225--236

In this research, a flat sheet supported liquid membrane (FSSLM) system was used to transfer germanium from the acidic medium. The poly-tetra fluoro ethylene (PTFE) membrane filter with the hydrophobic nature and Cyanex 301 were selected as the support and the mobile carrier, respectively. The influence of various parameters being pH of the feed solution (1.5-5), germanium concentration (10-40 mg/dm3), carrier concentration in the solid membrane (10-40 vol%), and sulfuric acid concentration of the receiving phase (100-400 g/dm3) was investigated on the transport of germanium. Under the optimum condition being pH of 1.5, the germanium concentration of 40 mg/dm3, the carrier concentration of 1.18 mol/dm3, and the sulfuric acid concentration of 400 g/dm3, a mass transfer model was developed. Based on this model, the transport mechanism, diffusion of species to the feed-membrane interface, the chemical reaction of species and Cyanex 301, and diffusion of germanium-Cyanex 301 complexes across SLM were explained. According to the obtained model, the values of 6.57 and 738.6 s/cm were achieved for the aqueous and organic diffusion resistances, respectively.

Models of air mixing in a mine working

Ptaszyński B.

Górnictwo i Geoinżynieria

2006

R. 30, z. 2

53-63

The paper presents the transient function F(t) and the weight function E(t) for the chosen, most commonly applied models of air transfer in mine workings. The knowledge of these, the first one in particular, may be practically utilized to better map the actual mass transfer in the working.

W pracy zaprezentowano funkcję przejściową F(t) i funkcję ciężarową E(t) dla wybranych, najczęściej stosowanych modeli transportu powietrza w wyrobiskach górniczych. Znajomość ich, szczególnie tej pierwszej, może być w praktyce wykorzystana w celu lepszego odwzorowania rzeczywistego transportu masy w wyrobisku.