Activities of SnO in the SnO ‐ SiO2 System

Abstract

The activities of normalSnO in the binary melts normalSnO‐SiO2 have been investigated by emf measurements using the cellnormalSn1,)(normalSnO‐SiO21normalZrO2‐CaOnormalNiOs,normalNiS−solid electrolyte+The results indicate positive deviations from an ideal “molecular” model and it is suggested that normalSnO is one of the more acidic oxides with respect to silica.

Chemical equilibrium calculations for bulk silicate earth material at high temperatures

“…Figure 17b shows good agreement between the present work and results from Wang et al (2019). Carbo-Nover and Richardson (1972) reported ideal solution for SnO in SnO -SiO2 melts (with < 1% SnO2) at 1273 -1523 K. However, Kozuka et al (1968) and Grau and Flengas (1976) found g(SnO) > 1 in the same system.…”

The Recovery of Metallic Tin from an Industrial Tin-Bearing By-Product Containing Na2SO4 by Reduction Smelting Process

“…Because the SnO in the SnO-SiO 2 system had low activity, SnO was hardly reduced to metallic tin and left in slag [18,19]. In addition, according to the result measuring the activity of SnO in the molten SnO-SiO 2 conducted by Koike [20] and Grau [21], the activity of SnO sharply decreased as the molar fraction of SiO 2 was raised. From this activity behavior of SnO in SnO-SiO 2 , the steep slope of tin content in slag with Na 2 O/SiO 2 ratio in this study could be understood.…”