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2014•Advanced materials researchOpen access

Removal of Alkali in the Red Mud Using CO2 at Ambient Conditions

Xin Ke Wang, Yi He Zhang, Feng Lv, Rong Lu

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Abstract

A laboratory study was carried out to investigate the ability of neutralization of red mud(RM) using carbon dioxide gas at ambient conditions. It was to evaluate the removal of alkali in the red mud using CO2.The neutralized red mud was characterized by X-ray diffraction(XRD) , FP-640 flame photometer and auto titration method. XRD patterns of red mud revealed that the intensity of sodalite was decreased by using CO2. The pH of red mud was decreased from 11 to 8 . The specific advantages of these processes are that, through adding with hydrochloric acid(HCl) and N-Methyldiethanolamine(MDEA), the removal of alkali in the red mud (Na2O) was decreased from 12.5% to 2.3% by adding with HCl.What is more , the removal ratio of sodium oxide in the red mud by adding with HCl can be received at 80%.

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What this paper is about

A laboratory study was carried out to investigate the ability of neutralization of red mud(RM) using carbon dioxide gas at ambient conditions. It was to evaluate the removal of alkali in the red mud using CO2.The neutralized red mud was characterized by X-ray diffraction(XRD) , FP-640 flame photometer and auto titration method. XRD patterns of red mud revealed that the intensity of sodalite was decreased by using CO2. The pH of red mud was decreased from 11 to 8 . The specific advantages of these processes are that, through adding with hydrochloric acid(HCl) and N-Methyldiethanolamine(MDEA), the removal of alkali in the red mud (Na2O) was decreased from 12.5% to 2.3% by adding with HCl.What is more , the removal ratio of sodium oxide in the red mud by adding with HCl can be received at 80%.

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Available abstract

A laboratory study was carried out to investigate the ability of neutralization of red mud(RM) using carbon dioxide gas at ambient conditions. It was to evaluate the removal of alkali in the red mud using CO2.The neutralized red mud was characterized by X-ray diffraction(XRD) , FP-640 flame photometer and auto titration method. XRD patterns of red mud revealed that the intensity of sodalite was decreased by using CO2. The pH of red mud was decreased from 11 to 8 . The specific advantages of these processes are that, through adding with hydrochloric acid(HCl) and N-Methyldiethanolamine(MDEA), the removal of alkali in the red mud (Na2O) was decreased from 12.5% to 2.3% by adding with HCl.What is more , the removal ratio of sodium oxide in the red mud by adding with HCl can be received at 80%.

Key concepts: Red mud, Sodalite, Alkali metal, Hydrochloric acid, Titration, Chemistry, Nuclear chemistry, Carbon dioxide

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