Formation of copper aluminate spinel and cuprous aluminate delafossite to thermally stabilize simulated copper-laden sludge

摘要

The study reported herein indicated the stabilization mechanisms at work when copper-laden sludge is thermally treated with γ-alumina and kaolinite precursors, and evaluated the prolonged teachability of their product phases. Four copper-containing phases - copper oxide (CuO), cuprous oxide (Cu_2O), copper aluminate spinel (CuAl_2O_4), and cuprous aluminate delafossite (CuAlO_2) - were found in the thermal reactions of the investigated systems. These phases were independently synthesized for leaching by 0.1 M HCl aqueous solution, and the relative teachabilities were found to be CuAl_2O_4