Synthesis of Hydrotalcite-Like Materials from Various Wastes in Aluminum Regeneration Process

摘要

Syntheses of hydrotalcite-like materials (HT), functional inorganic materials having layered structure of complex hydroxide, were carried out using aluminum dross, white dust and waste solution containing Mg in an aluminum regeneration process as a raw material. The removal of toxic anions such as As(III) and As(V) were investigated with the various HTs calcined at 673K. The CO32− type HT can be synthesized from the aluminum dross, white dust and MgCl2 solution by a co-precipitation method. The characteristics of HT obtained from the wastes are almost the same as that synthesized from reagents. It is possible to remove As(III) and As(V) in aqueous solution with various HT calcination products. Three stages of batch adsorption operation is suitable to remove As(III) and As(V) with the HT calcination product. The HT derived from the above wastes can be used as an excellent material for the removal of various toxic heavy metal ions.