Abstract
A large amount of blast furnace slag, a by-product of the iron-making process, is generated annually. We attempted to convert blast furnace slag (BFS) into zeolitic materials using alkali fusion with ethylenediamine tetraacetate dihydrate (EDTA) chelation. Without addition of EDTA, a mixture of hydroxysodalite and calcite was synthesized. With EDTA addition, Ca2+ ions were trapped by chelation in solution during agitation, then the chelation was promoted by heating at synthesis, and zeolite-A, zeolite-X and hydroxysodalite were synthesized.
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