Preparation of Ca–Si–Al–Mg porous ceramics by Co-operation of Ca&Mg-contained soda residue and altered rock gold tailings

Abstract

Utilization of two solid wastes of altered rock gold tailings and soda residue as main raw materials, and investigated the effects of soda residue, Al2O3 and MgO contents on bulk density, compressive strength and crystal phase of porous ceramics. The results showed that porous ceramics with the main crystalline phases of diopside can be prepared from high solid waste content (gold tailings + soda residue accounting for 95%) at 1170 °C. The addition of MgO made the final product generate augite phase, which improved the compressive strength of the porous ceramics. The best results of bulk density and compressive strength of the final product are 0.50 g/cm3 and 6.02 MPa respectively.