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Title: Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate

Abstract

To design economic roasting processes for the recovery of rare earth phosphates from coal-derived feedstocks, it is convenient to study model systems of rare earth phosphate plus a reactant. In this work, the kinetics of the high-temperature roasting of lanthanum phosphate with sodium carbonate were studied. It is typically necessary to heat the reaction mixture above the melting point of Na 2CO 3 (851 °C) to observe appreciable reaction to form La 2O 3. Furthermore, grinding the reactants reduces the necessary temperature to as low as 625 °C. It is believed that this increase in reactivity occurs because the ball milling process reduces the reactant particle size in addition to ensuring that the reaction mixture is thoroughly mixed. XRD hot stage results suggest a two-reaction mechanism is the route by which La 2O 3 is produced from the ball milled sample upon reaction. Apparent activation energy and Arrhenius prefactor for each reaction were determined from TGA experiments.

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [1]; ORCiD logo [2]
  1. AECOM, Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1478384
Alternate Identifier(s):
OSTI ID: 1491087
Report Number(s):
[CONTR-PUB-388]
[Journal ID: ISSN 0888-5885]
Grant/Contract Number:  
[FE0004000]
Resource Type:
Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
[ Journal Volume: 57; Journal Issue: 18]; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Burgess, Ward A., Keller, Murphy J., Lekse, Jonathan W., Howard, Bret H., Roth, Elliot A., and Granite, Evan J. Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate. United States: N. p., 2018. Web. doi:10.1021/acs.iecr.8b00249.
Burgess, Ward A., Keller, Murphy J., Lekse, Jonathan W., Howard, Bret H., Roth, Elliot A., & Granite, Evan J. Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate. United States. doi:10.1021/acs.iecr.8b00249.
Burgess, Ward A., Keller, Murphy J., Lekse, Jonathan W., Howard, Bret H., Roth, Elliot A., and Granite, Evan J. Mon . "Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate". United States. doi:10.1021/acs.iecr.8b00249. https://www.osti.gov/servlets/purl/1478384.
@article{osti_1478384,
title = {Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate},
author = {Burgess, Ward A. and Keller, Murphy J. and Lekse, Jonathan W. and Howard, Bret H. and Roth, Elliot A. and Granite, Evan J.},
abstractNote = {To design economic roasting processes for the recovery of rare earth phosphates from coal-derived feedstocks, it is convenient to study model systems of rare earth phosphate plus a reactant. In this work, the kinetics of the high-temperature roasting of lanthanum phosphate with sodium carbonate were studied. It is typically necessary to heat the reaction mixture above the melting point of Na2CO3 (851 °C) to observe appreciable reaction to form La2O3. Furthermore, grinding the reactants reduces the necessary temperature to as low as 625 °C. It is believed that this increase in reactivity occurs because the ball milling process reduces the reactant particle size in addition to ensuring that the reaction mixture is thoroughly mixed. XRD hot stage results suggest a two-reaction mechanism is the route by which La2O3 is produced from the ball milled sample upon reaction. Apparent activation energy and Arrhenius prefactor for each reaction were determined from TGA experiments.},
doi = {10.1021/acs.iecr.8b00249},
journal = {Industrial and Engineering Chemistry Research},
number = [18],
volume = [57],
place = {United States},
year = {2018},
month = {4}
}

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Cited by: 3 works
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