Experimental results: Pilot plant calcine dissolution and liquid feed stability

Herbst, Ronald; Fryer, David S.; Brewer, K.N.; Johnson, Calvin K.; Todd, T. A.

doi:10.2172/137286

Cited by 7 publications

(13 citation statements)

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“…Previous results from statistically designed experiments with pilot plant calcines indicated the acid to calcine ratio and temperature were the most prominent variables affecting dissolution relative to nitric acid concentration and dissolution time [2].…”

Section: Run H-4 Radioactive Calcinementioning

confidence: 99%

“…% of the initial calcine mass [2]. The resulting dissolver solution contained an acid concentration of ~3.…”

Section: Pilot Plant Calcinementioning

confidence: 99%

“…Table 6 lists the variables, associated sign, and ranges used in the statistical experiments. The ranges selected for the process variables were selected based on results of previous, similar type studies [2]. Each dissolution experiment was performed in duplicate.…”

Section: Run H-4 Radioactive Calcinementioning

confidence: 99%

“…Experimental work on calcine dissolution was performed in FY93 and FY94 using simulated calcines generated in the pilot plant calciners at INTEC [2]. The analysis of undissolved solids (UDS) from the dissolution of pilot plant calcines indicate the major undissolved species are α-and γ-alumina (both phases are insoluble in mineral acids) for Al containing calcines and CaF 2 or calcium stabilized zirconia, Ca 0.15 Zr 0.85 O 1.85 , for the Zr type calcines.…”

Section: Introductionmentioning

confidence: 99%

“…The previous experimental work with pilot plant calcines focussed on definition of dissolution parameters for five different, representative types of pilot plant calcine [2]. The goal of that work was to establish a single dissolution procedure applicable to the gamut of calcine types with the objectives of dissolving the maximal amount of calcine with minimal processing requirements in terms of dissolvent (acid) composition and amount used, process time, and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution studies with pilot plant and actual INTEC calcines

Herbst¹,

Garn²

1999

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The dissolution of INTEC (previously the Idaho Chemical Processing Plant) pilot plant calcines was examined to determine solubility of calcine matrix components in acidic media. Two representative pilot plant calcine types were studied: Run 74 Zirconia calcine and Run 64 Zirconia/Sodium calcine. Dissolution of the calcines were evaluated using lower initial concentrations of nitric acid than used in previous tests to decrease the [H + ] concentration in the final solutions. Lower [H + ] concentrations contribute to more favorable TRUEX/SREX solvent extraction flowsheet performance. Experimental results indicated the following conditions define the baseline dissolution process for Zr calcine types:Under the above conditions, the final dissolved solutions contained an H + concentration of ~1.2 M while dissolving >95 wt. % of initial calcine mass. The solution stability adequately met previous calcine dissolution criteria.Dissolution and analytical results were also obtained for radioactive calcines produced in 1998 during NWCF campaign H-4. This calcine was produced using high sodium feeds from tanks WM-185 and WM-188 blended with non-radioactive Al(NO 3 ) 3 solutions to dilute the sodium concentration and prevent bed agglomeration during the calcination process. Due to the addition of Al(NO 3 ) 3 , the H-4 calcines composition resemble that of Al types. Dissolution tests indicated >95 wt. % of the initial calcine mass can be dissolved using the above baseline dissolution procedure, with the exception that higher (5.1 to 5.9 M HNO 3 ) initial nitric acid concentrations are required. The higher initial acid concentration is required for stoichiometric dissolution of the oxides, primarily aluminum oxide, Al 2 O 3 .Statistically designed experiments using Run 74 pilot plant calcine were performed to determine the effect of mixing rate on dissolution efficiency. Three variables were ranked using an interaction analysis to determine the effects of three process variables on the measured response (wt. % dissolution.) The variables were ranked in order of decreasing effect:Temperature > Acid/Calcine Ratio > Mixing Rate Mixing rate was determined to provide minimal effects on wt. % dissolution. The acid/calcine ratio and temperature were the predominate variables affecting the wt. % dissolution, a result consistent with previous studies using other similar types of pilot plant calcines.iv ACKNOWLEDGEMENTS

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Section: Run H-4 Radioactive Calcinementioning

confidence: 99%

“…% of the initial calcine mass [2]. The resulting dissolver solution contained an acid concentration of ~3.…”

Section: Pilot Plant Calcinementioning

confidence: 99%

Section: Run H-4 Radioactive Calcinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissolution studies with pilot plant and actual INTEC calcines

Herbst¹,

Garn²

1999

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Cesium Absorption from Acidic Solutions Using Ammonium Molybdophosphate on a Polyacrylonitrile Support (AMP-PAN)

Miller

Olson

Johnson

1997

Separation Science and Technology

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Recent efforts at the Idaho Chemical Processing Plant (ICPP) have included evaluation of cesium removal technologies as applied to ICPP acidic radioactive waste . . streams. Ammonium molybdophosphate (AMP) immobilized.on .a polyacfLlonitrile support (AMP-PAN) has been studied as an ion exchange agent for cesium removal from acidic waste solutions. Capacities;. distribution coefficients, elutability, and kinetics of cesium extraction, have been evaluated. Exchange breakthrough curves using small columns have *been determined fiom 1M HNO, and simulated waste solutions. The theoretical capacity of AMP is 213 g Cskg AMP. The average experimental capacity in batch contacts with various acidic solutions was -1 5 0 g Cskg -.AMP. The measured cesium distribution coefficients fiom actual waste solutions were 3287 d / g for dissolved zirconia calcines, and 2679 d / g for sodium-bearing waste. The cesium in the dissolved alumina calcines was analyzed for; however, the concentration was below analytical detectable limits resulting in inconclusive results.The reaction kinetics are very rapid (2-10 minutes). Cesium absorption appears to be independent-of acid-c-oncentration-over-tlie range tes~eeci-(Grli~~o5ivl-~G~)), ----

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Actinide partitioning from actual ICPP dissolved zirconium calcine using the TRUEX solvent

Brewer¹,

Herbst²,

Tranter³

1995

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This report was prepared as an amount of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Experimental results: Pilot plant calcine dissolution and liquid feed stability

Cited by 7 publications

References 1 publication

Dissolution studies with pilot plant and actual INTEC calcines

Dissolution studies with pilot plant and actual INTEC calcines

Cesium Absorption from Acidic Solutions Using Ammonium Molybdophosphate on a Polyacrylonitrile Support (AMP-PAN)

Actinide partitioning from actual ICPP dissolved zirconium calcine using the TRUEX solvent

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