High vacuum indirectly-heated rotary kiln for the removal and recovery of mercury form air pollution control scrubber waste

摘要

In the mining industry, mercury is often associated with various ores, particularly copper and lead. To meet Environmental Protection Agency (EPA) and state air emission regulations, smelters must remove mercury vapors from hot exhaust gases, usually Through the use of scrubbing solutions. Most of the mercury is precipitated out of the waste scrubbing solutions as the sulfide and the Sludge dewatered in a filter press. SpraDyne orporation (Denton, TX, USA) has conducted pilot-scale treatability studies of dewa- Tered acid plant blowdown sludge generated by a copper smelter using its recently patented high temperature and high vacuum indir- Ectly-heated rotary retort technology.