EFFECT OF SODIUM HYDROALUMINOSILICATE (SHAS) STRUCTURE ON REMOVAL OF IMPURITIES FROM ALUMINA PRODUCTION SOLUTIONS AND ON EFFICIENCY OF REGENERATION PROCESSES

摘要

Both the additives contained in the solution and the temperature and duration of the process have an impact on the specific sodium hydroaluminosilicate (SAHS) form produced. The Cl~- ion leads to the formation of sodalite structure, SO_4~(2-) leads to the formation of nosean structure, and CO_3~(2-) leads to the formation of nosean at low temperature and cancrinite at high temperature. In this paper, we study SHAS adsorption properties as a function of the conditions under which the SHASs were produced in order to address the issue of removing impurity anions from recirculating solutions.