Sulfur Polymer Stabilization/Solidification (SPSS) Treatability of Simulated Mixed-Waste Mercury Contaminated Sludge Page: 3 of 10
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WM'02 Conference, February 24-28, 2002, Tucson, AZ- pg. 3
included to ensure the sulfide reaction.. Once the mercury is chemically stabilized, the mixture is heated
at about 1300C until a homogeneous molten mixture is formed. It is then poured into a suitable mold
where it cools to form a monolithic solid waste form.
Pilot-scale SPSS processing was accomplished using a 1-ft3, oil-heated, vacuum capable, vertical cone
mixer (Ross Mixers, Hauppauge, NY). Mixing action is provided by a 24-inch long auger screw, rotating
up to 105 revolutions per minute (rpm), which also revolves orbitally around the wall of the vessel, at up
to 2.5 rpm. The auger screw draws material upward from the base of the cone, resulting in thorough
mixing. Feed materials are charged to the unit through a 6-inch diameter port on the cone lid. the auger
screw drawing material upward from the base of the cone. A photograph of the mixer and process control
equipment is shown in Figure 1. Heat is provided to the jacketed cone by a 9kW circulating fluid heat
transfer system (Mokon, Buffalo, NY). A 5 cm (2 in) heated ball valve at the base of the cone is used to
discharge the molten SPSS product.
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Fig. 1. Vertical cone mixer and process controls with simulated sludge mixing in the foreground.
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Adams, J. W.; Bowerman, B. S. & Kalb, P. D. Sulfur Polymer Stabilization/Solidification (SPSS) Treatability of Simulated Mixed-Waste Mercury Contaminated Sludge, article, February 25, 2002; Tucson, Arizona. (https://digital.library.unt.edu/ark:/67531/metadc786230/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.