Molten glass (Factory block)

This recipe creates a small amount of gravel and sand as a byproduct, but not enough for me to consider shipping it (though maybe I could turn it into salt and ship that, since salt is a more important commodity). I could also turn the gravel into sand, but I prefer to make the sand on its own since it already uses few machines and produces tailings as a byproduct.

Input:


 * Quartz ore
 * Fluid fuel

Intermediate steps:


 * Create sand
 * Process the quartz ore into quartz dust

Output:


 * Tailings
 * Molten glass