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Acta Metallurgica Sinica ›› 2020, Vol. 26 ›› Issue (3): 303-312.DOI: 10.16108/j.issn1006-7493.2019048

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CO2 Absorption and Precipitation Study Using Magnesium-based Tailings from Salt Lake Potassium Production

WANG Han,ZHU Chen,ZHANG Menglong,ZHAO Liang   

  1. Key Laboratory of Surficial Geochemistry Ministry Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • Received:2019-05-22 Revised:2019-05-27 Online:2020-06-20 Published:2020-06-28

Abstract: In order to achieve the goal of temperature control of 1.5℃ proposed by IPCC, mineral sequestration has been widely studied due to its long-term stability and safety. This paper selects magnesium-based tailings as the raw material for further research. Magnesium-based tailings, as waste of potassium salt production in the salt lake, have been plaguing the local industry due to limited application. If used as a raw material for sequestration of carbon dioxide, it will have great storage potential. In this experiment, two core processes of CO2 absorption and carbonate precipitation were studied to investigate the reaction rate and path of CO2 in MgCl2-NH3-NH4Cl system under four different reaction temperatures (0, 20, 50, 80℃ ). It was found that the kinetic reaction rate constant of CO2 at the gas-liquid interface is an important factor limiting CO2 mass transfer. Modeling temperature and reaction rate constant and their relationship was found to  kapp=1.4857×105 exp(-1974/T) . In addition, for the CO2 absorption rate and carbon precipitation rate of the magnesium carbonate precipitation process, the optimal experimental temperature conditions are proposed, indicating the potential for large-scale application.

Key words: carbon dioxide, mineral sequestration, absorption rate, temperature

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