High vacuum indirectly-heated rotary kiln for the removal and recovery of mercury from air pollution control scrubber waste
- Scientific Consulting Labs., Inc., Farmers Branch, TX (United States)
SepraDyne corporation (Denton, TX, US) has conducted pilot-scale treatability studies of dewatered acid plant blowdown sludge generated by a copper smelter using its recently patented high temperature and high vacuum indirectly-heated rotary retort technology. This unique rotary kiln is capable of operating at internal temperatures up to 850 C with an internal pressure of 50 torr and eliminates the use of sweep gas to transport volatile substances out of the retort. By removing non-condensables such as oxygen and nitrogen at relatively low temperatures and coupling the process with a temperature ramp-up program and low temperature condensation, virtually all of the retort off-gases produced during processing can be condensed for recovery. The combination of rotation, heat and vacuum produce the ideal environment for the rapid volatilization of virtually all organic compounds, water and low-to-moderate boiling point metals such as arsenic, cadmium and mercury.
- OSTI ID:
- 347635
- Report Number(s):
- CONF-980513-; ISSN 0956-053X; TRN: IM9923%%172
- Journal Information:
- Waste Management, Vol. 18, Issue 6-8; Conference: International conference on incineration and thermal treatment technologies, Salt Lake City, UT (United States), 11-15 May 1998; Other Information: PBD: 1998
- Country of Publication:
- United States
- Language:
- English
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