Experiments with a lime slurry in a stirred tank for the fixation of carbon-14-contaminated CO/sub 2/ from simulated HTGR fuel reprocessing off-gas

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The fixation of CO/sub 2/ with a lime slurry in a stirred tank reactor appears to be feasible. The rate of reaction is fast, and virtually complete removal of CO/sub 2/ can be attained. At a gas residence time of <1 min, the decontamination factor (DF) is >100 in a single stage reactor for CO/sub 2/ concentrations ranging from 5 to 100%. It has been determined that two-stage contacting sequences which result in a cumulative DF > 10/sup 4/ are feasible. The reaction rate is constant up to 90% utilization of the lime and then rapidly decreases, as does the ... continued below

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Pages: 105

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Holladay, D. W. March 1, 1978.

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The fixation of CO/sub 2/ with a lime slurry in a stirred tank reactor appears to be feasible. The rate of reaction is fast, and virtually complete removal of CO/sub 2/ can be attained. At a gas residence time of <1 min, the decontamination factor (DF) is >100 in a single stage reactor for CO/sub 2/ concentrations ranging from 5 to 100%. It has been determined that two-stage contacting sequences which result in a cumulative DF > 10/sup 4/ are feasible. The reaction rate is constant up to 90% utilization of the lime and then rapidly decreases, as does the pH for the remainder of the reaction. The reaction appears to be liquid-phase-controlled, and the overall gas-side mass transfer coefficient (K/sub G/..cap alpha..) increases with impeller speed and gas flow rate, ranging from 0.4 x 10/sup -6/ to 6 x 10/sup -6/ g-moles of CO/sub 2/ per (cm/sup 3/-sec-atm). The reaction rate data are also correlated by a model of mass transfer accompanied by a fast pseudo first-order chemical reaction from which good agreement of calculated and predicted interfacial area is obtained. It was noted that temperature (21 to 46/sup 0/C) and lime concentration (0.5 to 1.5 M) had very little effect on mass transfer rate and DF. The settling rate of the CaCO/sub 3/ product increased significantly with impeller speed and temperature and decreased with gas flow rate. Scale-up calculations indicate that reasonably sized equipment would provide adequate removal of CO/sub 2/ for a full-scale reprocessing plant.

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Pages: 105

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Dep. NTIS, PC A06/MF A01.

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  • Report No.: ORNL/TM-5757
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/5065862 | External Link
  • Office of Scientific & Technical Information Report Number: 5065862
  • Archival Resource Key: ark:/67531/metadc1057463

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Creation Date

  • March 1, 1978

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:07 p.m.

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Holladay, D. W. Experiments with a lime slurry in a stirred tank for the fixation of carbon-14-contaminated CO/sub 2/ from simulated HTGR fuel reprocessing off-gas, report, March 1, 1978; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1057463/: accessed July 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.