Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics
The objective of this study was to investigate the feasibility of indirect carbonation of red gypsum through pH swing process. The effect of CO2 pressure as one of the major controlling parameters in carbonation process was investigated in details. The dissolution of red gypsum was performed using 2...
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my.utm.585612021-12-12T04:17:44Z http://eprints.utm.my/id/eprint/58561/ Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics Azdarpour, Amin Asadullah, Mohammad Mohammadian, Erfan Junin, Radzuan Hamidi, Hossein Manan, Muhammad A. Daud, Ahmad Rafizan Mohamad TP Chemical technology The objective of this study was to investigate the feasibility of indirect carbonation of red gypsum through pH swing process. The effect of CO2 pressure as one of the major controlling parameters in carbonation process was investigated in details. The dissolution of red gypsum was performed using 2M H2SO4 at 70°C for 60min reaction time. The pH was regulated using NH4OH, which also precipitated out the impurities from the solution. Finally, the calcium rich solution was poured in an autoclave reactor and CO2 was injected into the reactor for carbonate precipitation. The experimental results showed that the Fe, the main impurity can be effectively separated prior to carbonation stage (92-95%). At low pH the Fe was separated while at high pH Ca was precipitated as carbonate. The carbonation efficiency was directly affected by the CO2 pressure and the maximum efficiency (100%) was achieved when 8bar CO2 pressure was used. In addition, carbonation experiments resulted in CaCO3 production in the form of calcite, aragonite, and vaterite with 98% purity. Elsevier 2015 Article PeerReviewed Azdarpour, Amin and Asadullah, Mohammad and Mohammadian, Erfan and Junin, Radzuan and Hamidi, Hossein and Manan, Muhammad A. and Daud, Ahmad Rafizan Mohamad (2015) Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics. Chemical Engineering Journal, 264 . pp. 425-436. ISSN 1385-8947 http://dx.doi.org/10.1016/j.cej.2014.11.125 DOI:10.1016/j.cej.2014.11.125 |
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TP Chemical technology Azdarpour, Amin Asadullah, Mohammad Mohammadian, Erfan Junin, Radzuan Hamidi, Hossein Manan, Muhammad A. Daud, Ahmad Rafizan Mohamad Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
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The objective of this study was to investigate the feasibility of indirect carbonation of red gypsum through pH swing process. The effect of CO2 pressure as one of the major controlling parameters in carbonation process was investigated in details. The dissolution of red gypsum was performed using 2M H2SO4 at 70°C for 60min reaction time. The pH was regulated using NH4OH, which also precipitated out the impurities from the solution. Finally, the calcium rich solution was poured in an autoclave reactor and CO2 was injected into the reactor for carbonate precipitation. The experimental results showed that the Fe, the main impurity can be effectively separated prior to carbonation stage (92-95%). At low pH the Fe was separated while at high pH Ca was precipitated as carbonate. The carbonation efficiency was directly affected by the CO2 pressure and the maximum efficiency (100%) was achieved when 8bar CO2 pressure was used. In addition, carbonation experiments resulted in CaCO3 production in the form of calcite, aragonite, and vaterite with 98% purity. |
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Article |
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Azdarpour, Amin Asadullah, Mohammad Mohammadian, Erfan Junin, Radzuan Hamidi, Hossein Manan, Muhammad A. Daud, Ahmad Rafizan Mohamad |
author_facet |
Azdarpour, Amin Asadullah, Mohammad Mohammadian, Erfan Junin, Radzuan Hamidi, Hossein Manan, Muhammad A. Daud, Ahmad Rafizan Mohamad |
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Azdarpour, Amin |
title |
Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
title_short |
Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
title_full |
Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
title_fullStr |
Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
title_full_unstemmed |
Mineral carbonation of red gypsum via pH-swing process: Effect of CO2 pressure on the efficiency and products characteristics |
title_sort |
mineral carbonation of red gypsum via ph-swing process: effect of co2 pressure on the efficiency and products characteristics |
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Elsevier |
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2015 |
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http://eprints.utm.my/id/eprint/58561/ http://dx.doi.org/10.1016/j.cej.2014.11.125 |
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