Mixing of process heels, process solutions, and recycle streams: Results of the small-scale radioactive tests

Abstract

The contact time was extended to 1 week to ensure equilibrium was attained.

Mixing of Process Heels, Process Solutions and Recycle Streams: Small-Scale Simulant

“…Since the turbidity values of the mixtures were appreciably greater than the controls, new precipitates must have formed. In support of this observation, Lumetta et al (2000) reported a significant amount of precipitates formed when AN-107 was mixed with AW-101 at a ratio of 3:30, respectively.…”

“…These tests were conducted because no turbidity was visually observed (no turbidity meter was used in the hot cells) when active feed samples were mixed, contrary to the results from the simulant mixing study and those of Lumetta et al (2000). Initially, this inconsistency was believed to be due to differences in feed concentrations; the simulants were more concentrated than the active feed samples.…”

“…Confirmation of the solids generation in AN-107 upon addition caustic feeds can be found in the Envelope Mixing tests also documented in this report and in actual waste tests. When an actual waste sample from AN-107 was mixed with AW-101 or with a leach solution from C-104 washing, solids formation was observed (Lumetta et al 2000).…”