PROCESS FOR CAUSTICIZING OF AN AQUEOUS SOLUTION CONTAINING ALKALI CARBONATE

摘要

Process for causticizing of an aqueous solution containing alkali carbonate with calcium oxide and hydroxide by bringing the aqueous solution containing alkali carbonate into contact with the calcium oxide or hydroxide and by separating the alkali hydroxide solution arisen in the causticizing from the calcium carbonate precipitate. The aqueous solution containing alkali carbonate is conducted through a bed which has been formed by mixing calcium oxide and calcium carbonate in the causticized alkali solution and by removing the excess alkali solution.