September 30, 2020, 05:14:35 AM
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Topic: Sodium Carbonate + Silica (Quartz)  (Read 331 times)

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Offline gatewood

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Sodium Carbonate + Silica (Quartz)
« on: February 13, 2020, 02:17:22 AM »
The process of glassmaking involves the melting of sodium carbonate with silica and silicates (sand or more precisely, quartz), which functions as a flux to lower the melting point of sand to far more manageable temperatures (900-1200°C).

My question is this, how does sodium carbonate react with silica/silicates to lower its melting point? Does the sodium bind with silicates to create sodium silicate?

Offline Enthalpy

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Re: Sodium Carbonate + Silica (Quartz)
« Reply #1 on: February 14, 2020, 02:10:00 PM »
It is my understanding that such temperatures destroy carbonates, releasing carbon oxides and leaving metal oxides.
The analysis of glass lists silica, sodium oxide, calcium oxide, but I guess they build silicates.
https://en.wikipedia.org/wiki/Sodium_carbonate#Glass_manufacture
https://en.wikipedia.org/wiki/Soda%E2%80%93lime_glass

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