EFRT M12 Issue Resolution: Comparison of PEP and Bench-Scale Oxidative Leaching Results

Pretreatment Engineering Platform Phase 1 Final Test Report

“…Chromium leaching performance in the PEP and laboratory systems as a function of time at the WTP projected conditions is provided in Rapko et al (2009) for Integrated Test A (UFP-1 caustic leaching) and B (UFP-2 caustic leaching). Results for these tests as well as the results for Integrated Test D are summarized and discussed in Section 11 of this report.…”

“…This R&T condition is discussed in Mahoney et al (2009) and Section 9 of this report for caustic leaching. It is discussed in Rapko et al (2009) and Section 11 in this report for oxidative leaching. Details of the sampling and analytical results are provided in the run reports .…”

“…Yes. The chromium mass balance is discussed in Rapko et al (2009) for Integrated Tests A (T01 A/B caustic leaching) and B (T02A caustic leaching). A discussion of the mass balances for all of the selected constituents is presented in Section 12.…”

“…Chromium concentrations and leach factors obtained during the PEP and laboratory-scale testing are compared in Rapko et al (2009) for Integrated Tests A and B and are also discussed in Section 11 of this report along with the results of Integrated Test D. The cumulative leach factors were found to be approximately 0.9 and the recommended scale-up factor is 1. Cross-flow ultrafiltration: Monitor cross-flow filter performance at engineering-and laboratory-scale to determine scale-up.…”

PEP Support Laboratory Leaching and Permeate Stability Tests

“…There were two tests for PEP Test D with different amounts of permanganate added (Section 6.5). The analysis of test results presented in this section is reported in WTP-RPT-186 (Mahoney et al 2009) and WTP-RPT-188 (Rapko et al 2009). Integrated PEP Test C was deleted from the scope of the testing (ICN-TP-RPP-WTP-506_R0.2).…”