Assertion: sodium carbonate | /r/CapableOf | comprise dissolving crude trona
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Source sentences:
text: The method of producing sodium carbonate which comprises: dissolving the crude trona containing organic impurities in an aqueous solvent, clarifying the solution so formed, leaving organic impurities dissolved therein, recovering sodium carbonate-containing crystals containing organic impurities from said clarified solution, calcining said crystals at normal calcining temperatures to form a light ash containing organic impurities therein, calcining said light ash in a non-reactive atmosphere at a high temperature between 450 C. and 550 C. for a period of from l0 minutes to 60 minutes (a) to volatilize substantial amounts of organic impurities therefrom, (b) to convert most of the remainder of the organic impurities to a coke, and (c) to convert said sodium carbonate-containing crystals into soda ash, said soda lash having a high bulk density and, when heated with phosphoric acid, producing a sodium tripolyphosphate with a reflectance above about 85 and said soda ash giving 'a low foam index when mixed with phosphoric acid.