Hydrothermal synthesis of clay minerals from burned sludge

Abstract

It is expected that clay minerals and zeolite can be synthesized from burned sluge because it contains Si, Al, Fe. In this study, burned sluge was treated with various salt solution such as NaOH, KOH, HCl, MgCl₂, MgCO₃(basic), AlCl₃, NaAlO₂ at 150, 200, and 250°C for 1 to 10 days. The products were examined by means of XRD. As a result, smectite, kaolinite, vermiculte, mica clay minerals, mix layered smectite-vermiculite, and zeolite were formed.