PREVIEW
... d a half-updraft kiln to make fuller use of heat, with the added wind achieving the temperature necessary to smelt quartz sand.
The calcined quartz sand is directly poured into snow water, rapidly cooled to remove impurities, obtaining purer silicon dioxide.
When it’s time for the second calcination, limestone and silicon dioxide are mixed in a certain proportion and put into the kiln again, which can be smelted into glass.
Initially, many people found it novel and wonder ...
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