ABSTRACT
The high mercury concentration in gold separation residue is a main limiting factor to realizing the collaborative disposal of gold separation residue in cement kiln. In this study, the horizontal tubular furnace system was used as the heat source to simulate the high-temperature flue gas of a cement kiln, meanwhile, the removal of mercury in gold separation residue by thermal desorption was studied from influence factors such as temperature, time, flow rate and atmosphere. Combining with the experimental results and the actual operating conditions of the cement kiln, it is determined that the optimal temperature for thermal desorption of high concentration mercury pollutants (640 mg/kg) in gold separation residue is 300°C, the optimal time is 20 min, the flow rate is 300 ml/min, pH is 9, and the mercury removal rate is 97.64%.
