Sample Results from MCU Solids Outage [report]

T. Peters, A. Washington, L. Oji, C. Coleman, M. Poirier
2014 unpublished
There were 53 recommendations for improving operations recently identified. Some additional considerations or additional details are provided below as recommendations.  From this point on, IC-Anions analyses of the DSSHT should be part of the monthly routine analysis in order to spot negative trends in the oxalate leaving the MCU system. Care must be taken to monitor the oxalate content to watch for sudden precipitation of oxalate salts in the system.  Conduct a study to optimize the cleaning
more » ... timize the cleaning strategy at ARP-MCU through decreasing the concentration or entirely eliminating the oxalic acid.  The contents of the SSFT should remain unagitated. Routine visual observation should be maintained to ensure there is not a large buildup of solids. As water with agitation provided sufficient removal of the solids in the feed tank, it should be considered as a good means for dissolving oxalate solids if they are found in the future.  Conduct a study to improve prediction of oxalate solubility in salt batch feed materials. As titanium and mercury have been found in various solids in this report, evaluate if either element plays a role in oxalate solubility during processing.  Salt batch characterization focuses primarily on characterization and testing of unaltered Tank 21H material; however, non-typical feeds are developed through cleaning, washing, and/or sump transfers. As these solutions are processed through MCU, they may precipitate solids or reduce performance. Salt batch characterization and testing should be expanded to encompass a broader range of feeds that may be processed through ARP-MCU.
doi:10.2172/1160325 fatcat:4okjp6hdefbmppdq756a2ykmkm