METHOD FOR UTILIZING WASTE ALKALI WATER SOLUTION CONTAINING ALKALI HYDROXIDE

摘要

PURPOSE: To provide a method for utilizing industrially and economically a waste alkali water soln. contg. an alkali hydroxide. ;CONSTITUTION: A gas contg. CO₂ is passed through a waste alkali water soln. contg. 0.1-8.0mol/l alkali hydroxide to react them to obtain an alkali water soln. contg. an alkali carbonate and then, an iron (II) salt water soln. being equivalent or less to the alkali carbonate contained in the alkali water soln. is added in the alkali water soln. to obtain a suspension contg. FeCO₃ and then, after FeCO₃ in the suspension is precipitated, supernatant liq. is removed to obtain a high concn. FeCO₃ suspension.;COPYRIGHT: (C)1993,JPO&Japio