Conversion kinetics of SrSO4 to SrCO3 in solutions obtained by dissolving/hydrolyzing of equimolar amounts of NH4HCO3 and NH4COONH2
作者： Mert Zoraga , Cem Kahruman , Ibrahim Yusufoglu
DOI: 10.1016/J.HYDROMET.2016.03.021
关键词:
摘要: Abstract Celestite concentrate (SrSO4) is one of the most important raw materials used for industrial production strontium compounds. In this study, effects stirring speed, particle size, CO32– ion concentration and temperature on conversion reaction rate SrSO4 to SrCO3 in solutions obtained by dissolving/hydrolyzing a mixture equimolar amounts NH4HCO3 NH4COONH2(AC) were investigated. The solution after total dissolution/hydrolysis AC consisted NH4+, CO32–, HCO3–, H2CO3* NH3. proceeds according dissolution precipitation mechanism. Sr2 + ions formed during precipitates with as pseudomorphically result porous layer produced form clusters. determining step exchange at interface between dense layers. kinetic parameters determined applying Shrinking Core Model. While was found be zero order up certain concentration, above it − 0.7th order. apparent activation energies reactions calculated 64.84 47.79 kJ mol− 1, respectively. amount S passed SO42 − quantitatively ICP-OES. structural morphological characterization celestite solid residues carried out XRD SEM.
sci-hub.se 参考文章(31)
John S. Chiang, David Goldstein, Preparation of strontium carbonate ,(1982)
Murat Erdemoğlu, Mehmet Canbazoğlu, The leaching of SrS with water and the precipitation of SrCO3 from leach solution by different carbonating agents Hydrometallurgy. ,vol. 49, pp. 135- 150 ,(1998) , 10.1016/S0304-386X(98)00018-8
Erika Turianicová, Abdullah Obut, Anna Zorkovská, Peter Baláž, Marek Matik, Jaroslav Briančin, The effects of LiOH and NaOH on the carbonation of SrSO4 by dry high-energy milling Minerals Engineering. ,vol. 49, pp. 98- 102 ,(2013) , 10.1016/J.MINENG.2013.05.017
AHE Castillejos, AS Uribe, None, The direct conversion of celestite to strontium carbonate in sodium carbonate aqueous media Hydrometallurgy. ,vol. 40, pp. 207- 222 ,(1996) , 10.1016/0304-386X(94)00060-G
R. S. Sonawane, S. K. Apte, B. B. Kale, M. K. Dongare, Effect of a catalyst on the kinetics of reduction of celestite (SrSO4) by active charcoal Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science. ,vol. 31, pp. 35- 41 ,(2000) , 10.1007/S11663-000-0128-6
Nanping Wen, Murray H. Brooker, Ammonium Carbonate, Ammonium Bicarbonate, and Ammonium Carbamate Equilibria: A Raman Study. The Journal of Physical Chemistry. ,vol. 99, pp. 359- 368 ,(1995) , 10.1021/J100001A054
Abdullah Obut, Peter Baláž, İsmail Girgin, Direct mechanochemical conversion of celestite to SrCO3 Minerals Engineering. ,vol. 19, pp. 1185- 1190 ,(2006) , 10.1016/J.MINENG.2005.11.001
N. Setoudeh, N.J. Welham, S.M. Azami, Dry mechanochemical conversion of SrSO4 to SrCO3 Journal of Alloys and Compounds. ,vol. 492, pp. 389- 391 ,(2010) , 10.1016/J.JALLCOM.2009.11.114
Richard E. Zeebe, On the molecular diffusion coefficients of dissolved CO2,HCO3-, and CO32- and their dependence on isotopic mass Geochimica et Cosmochimica Acta. ,vol. 75, pp. 2483- 2498 ,(2011) , 10.1016/J.GCA.2011.02.010