Subpart CC—Soda Ash Manufacturing
§98.290 Definition of the source category.
A soda ash manufacturing facility is any facility with a manufacturing line that produces soda ash by one of the methods in paragraphs (a) through (c) of this section:
(a) Calcining trona.
(b) Calcining sodium sesquicarbonate.
(c) Using a liquid alkaline feedstock process that directly produces CO2.
In the context of the soda ash manufacturing sector, "calcining" means the thermal/chemical conversion of the bicarbonate fraction of the feedstock to sodium carbonate.