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reactive silica
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Silica is a problem for high pressure boilers. It exhibits enough volatility that high pressure boilers will have silica carry over to the vapor partition. When the steam pressure is reduced in the turbines, the silica will precipitate on the blades as a glassy deposit which reduces efficiency. Both types of silica, colloidal and reactive, can cause this problem as colloidal silica will break down and volatilize under high temperature and pressure.
