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lucite fabrication

Kinetic mixers are used conventionally for plastics processing and compounding applications, i.e., mixing fillers, colorants and/or additives with polymers. The advantage of kinetic mixers for plastic processing stems from the ability to vary batch composition including polymer type, polymer grade, filler material and filler loading on a batch-to-batch basis with little or no system and/or parameter modification. Capital equipment cost is also low for kinetic mixers compared with alternative processing methods (e.g., Banbury mixers, single-screw extruders, twin-screw extruders, or continuous mixers) with equivalent processing capacities. [(16)] Application of stock processing equipment, like the kinetic mixer, for new uses not included in original engineering design often results in specific technical deficiencies. During process development work, modifications were made to the kinetic mixer to enhance waste processing and permit the processing of actual hazardous and/or radioactive wastes. Kinetic mixer modifications included a new feed tube and feed gate, installation of vent ports for an off-gas collection system, and repair of the mixing blades. System improvements included the erection of a steel superstructure around the kinetic mixer, design and construction of an off-gas collection system and fabrication of a containment enclosure.

The as-received LEX mixer was not equipped with any off gas collection capability necessary for application to microencapsulation of mixed waste. Thus, BNL designed and constructed an offgas system to collect and contain vaporized gases and moisture. A schematic diagram of the off gas system components is shown in Figure 2.4. The process chamber was modified with two ventilation ports to accommodate the off gas system. The outboard end of the mixer was disassembled and the outer mixing chamber wall and end flange removed. Two 0.5 inch (1.3 cm) vent ports were drilled through the hard-facing on the mixing chamber wall and through the end flange by the BNL machine shop. The ports originated near the centerline of the mixing shaft. Off gases flow through steel mesh filters to reduce carryover and are then plumbed to a jacketed copper condensation coil that uses countercurrent flow-through water cooling as a heat exchange medium. Condensed vapors are collected in a 16.5 liter Lucite collection vessel. Off gas is then drawn through a liquid nitrogen trap, prefilter, HEPA filter and activated carbon bed. Vacuum is provided by a 41 ft3/min (116 l/min) vacuum pump. The system is fitted with three pressure gauges to monitor potential pressure drops due to plugging or leaking. Figure 2.5 is a photograph of the kinetic mixer off gas system. The condensation coil, Lucite condensate collection vessel, and rectangular HEPA filter box are clearly discernable

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lucite fabrication

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