Part of a silica process is outlined in the following steps:
1. Heat 15 mol% soda-85 mol% silica to 1800°C.
2. Cool to 1200°C.
3. At constant temperature, increase soda content to 25 mol%.
4. Cool to 1000°C.
5. At constant temperature, increase soda content to 35 mol%.
What, if any, solids are formed during this process? See Figure 15-17.

Transcribed Image Text:

Temperature (°C) 1800 1600 1400 1200 1000 800 SiO₂ L + tridymite 10 L + cristobalite L Na₂O +2SiO₂ 20 30 Mole percent Na₂O 40