Conversion of Enriched Isotopes of Sulfur from SF6 to a Suitable Compound for Feed to the Electromagnetic Calutron Separators.

摘要

Enriched isotopes of sulfur are becoming attractive for use as tracers in a variety of environmental and scientific experiments. many stages of separation are needed, especially for (sup 33)S and (sup 36)S, which exist in low natural abundances. Small amounts of highly enriched sulfur isotopes can be provided by means of electromagnetic separation in the calutrons. However, the cost is prohibitively high for enrichment of large amounts needed by many experiments. Thus, a two-stage process is planned to obtain large amounts using gas centrifuges for preenrichment, followed by final enrichment in the calutrons. Sulfur hexafluoride is the most efficient form for processing sulfur in the centrifuges; however, SF(sub 6) is unacceptable as feed to the calutrons because it has excellent insulating properties for the high voltage apparatus used to ionize the feed. An efficient process is needed to convert the preenriched sulfur isotopes from SF(sub 6) to a suitable form for calutron feed. Development of a process is difficult because of the relatively high stability of SF(sub 6). Reiner and Simmons have successfully converted SF(sub 6) to SO(sub 2) in pilot studies using a propane/oxygen flame reactor. However, H(sub 2)S is a more desirable intermediate for producing metal sulfides or sulfur halides. Thus, experiments have been made using direct hydrogenation at temperatures of >900(degrees)C. Conversion to cadmium sulfide has been accomplished by scrubbing the H(sub 2)S product gas with 5% CdCl(sub 2) and product yields of >90% have been achieved. A developmental program to convert SF(sub 6) to CdS, or another more efficient form is being carried out. Optimum conditions for the conversion are being determined and the products are being evaluated in calutron test runs. 7 refs., 5 figs., 2 tabs.