The influence of pH on the leaching behaviour of air pollution control (APC) residues produced in municipal solid waste incineration (MSWI) is addressed in this study. The residue is considered hazardous waste, and in accordance with their chemical properties, the leaching of contaminants into the environment is the main concern. Several leaching tests can be used for research studies or regula...

The photovoltaic industry generates large amounts of waste graphite (WG) that contains useful metals can be recycled into high-value products. This study elucidated the impurity elements and their existence states in WG, analyzed verified source main phase SiC, determined SiC content to 4.66%. WG was purified using an alkaline-acid method, whose optimal process parameters were a solid alkali ra...

A hydrometallurgical process for recycling spent Zn-MnO2 batteries was developed, involving leaching with sulfuric acid, purification by precipitation and metals separation for further recovery. Leaching of zinc oxide was easily attained while for manganese oxide was rather difficult depending on temperature and acid concentration. At 90oC and with the liquid/solid ratio of 20 L/kg, more than 9...