ガラス融液の酸化還元と清澄作用

概要

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The differential pulse voltammetry was applied to glass melts containing antimony ions. The experiments were performed in an atmosphere controlled reaction tube heated by MoSi_2 or SiC electric furnace. Three electrodes were immersed into a platinum reaction cell. The electrode reactions are expressed by, 0_2+2e=O^<2-> (reference electrode) Sb^<5+>+2e=Sb^<3+> (working electrode) The half wave potential (E_<1/2>) is expressed by the following equation under 1.013×10^5 Pa oxygen pressure. E_<1/2>=(RT/2F) In [Sb^<5+>] / [Sb^<3+>]. E_<1/2> increases to positive side with an increase in temperature. At 1300K E_<1/2> across 0 V, which means [Sb^<5+>] / [Sb^<3+>]=1. At higher temperature, i.e. 1800K, it is expected that antimony ion presents predominant as Sb^<3+>. The oxygen gas evolution is conducted by the refining reaction : Sb_2O_5 → Sb_20_3 + O_2↑ which occurs during the heating period. Effective evolution of oxygen bubbles supports the rise of bubbles originated from the starting material in glass production.
愛媛大学の論文