Browsing by Author "Royston, D"
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- ItemThe design and performance of pump-mix and gravity-flow mixer-settlers.(Australian Atomic Energy Commission, 1973-04) Royston, D; Burwell, AThe historical development of pump-mix and gravity-flow mixer-settlers is reviewed and their operating and design features, including scale-up, are discussed. An experimental study of the hydraulic operating characteristics of two such units, an AAEC designed pump-mix mixer-settler based on the original KAPL work and a UKAEA Windscale gravity-flow mixer-settler is described. The pump-mix unit was shown to be less flexible in operation than the gravity-flow unit and it is shown that an increase in size of all the ports will increase the throughput of the pump-mix mixer-settler.
- ItemFabrication of equipment from monel and other materials for corrosive service in the production of fluorine.(Australian Atomic Energy Commission, 1975-09) Royston, D; Chrimes, NWDLiterature is reviewed on the fabrication of Monel, mild steel and brazed equipment for use in the production of fluorine. The results of an experimental study on the welding of Monel components for a fluorine cell experimental plant are presented and the fabrication of equipment used in the plant is described. The corrosion history of the equipment after three months of continuous operation is outlined.
- ItemRegeneration of caustic potash solution used for the disposal of gaseous fluorides(Institution of Chemical Engineers, 1975-08-23) Royston, D; Burwell, A; Janov, J; Le Page, AH; Levins, DM; Ring, RJ; Vilkaitis, VKA system for the disposal of fluorine and gaseous hydrogen fluoride was developed as part of an experimental 1500 A fluorine cell facility used to investigate the production of fluorine. The design, operation and performance of the plant have been described in detail by Royston et al.1,2. The cell produced fluorine and hydrogen at 0.24 & s-1 with both gases containing approximately l0 vol.% hydrogen fluoride. These off—gases were disposed of continuously by scrubbing with 5-8.5 wt.% caustic potash solution which was regenerated by reaction with lime on a batch basis. This paper outlines the selection of the system and describes its operation and performance.
- ItemReview of fluorine cells and fluorine production facilities(Australian Atomic Energy Commission, 1973-09) Ring, RJ; Royston, DThe development of laboratory and industrial scale electrolytic cells used for the generation of fluorine is reviewed and the construction and operating characteristics of these cells are examined in detail. In addition, the associated facilities required for the supply and treatment of raw materials, treatment of product gases and disposal of waste materials are described. Safety practices adopted in the design and operation of equipment including personnel protection and first aid procedures are also outlined.
- ItemReview of processes for the production of hafnium-free zirconium.(Australian Atomic Energy Commission, 1970-10) Royston, D; Alfredson, PGThe three main industrial processes for the production of hafnium-free zirconium are described in terms of their head-end, zirconium-hafnium separation and zirconium metal forming steps. Possible improvements and alternative processes are outlined. Zirconium-hafnium separation schemes based on selective reduction of the chlorides or distillation and sublimation techniques show the most promise for future development in competition with the established hexone-thiocyanate and TBP-nitric acid solvent extraction schemes. Head-end steps involving direct chlorination of zircon in fluidised beds or caustic fusion and metal production via electrowinning warrant further development.