CHLORITE DISSOLUTION RELEVANT TO ENVIRONMENTAL PROCESSES IN URANIUM TAILINGS: INFLUENCE ON URANIUM(VI) MIGRATION

摘要

In flow-through reactor experiments the dissolution of a ripidolite chlorite (CCa-2) from Flagstaff Hill (El Dorado County, California, USA) was studied with the intention to approach mineral dissolution conditions occuring in the unsaturated zone of an uranium tailing. The experiments were conducted under atmospheric conditions, a temperature of 25 °C, an ionic strength of 0.1 M, and a pH of 7. In addition the experiments were conducted with and without 1.10~(-6) M uranium and also with and without a humic acid concentration of 5 mg/L.