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A calorimetric study of hydration of magnesia-ferriferous slag mechanically activated in air and in CO2 atmosphere

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Abstract

Hydration behavior of mechanically activated magnesia-ferriferous slag has been investigated by isothermal calorimetry. The slag is a waste of pyrometallurgical processing of Cu–Ni ores. Hydration activity of the slag is low in comparison to that of blast furnace slag. It has been shown that mechanical activation of the magnesia-ferriferous slag in CO2 atmosphere considerably increases its hydration activity. In the course of milling in planetary mill in CO2, the slag absorbs carbon dioxide molecules in the form of carbonate ions not only on the surface, but also in the bulk of the slag particles. This accelerates dissolution of the slag in water and the consequent formation of hydration reaction products. As a result, the slag is hardened at ambient temperature without addition of alkali agents or other chemical activators. Calorimetric measurements show that for the slag milled in CO2 the acceleration period comes without the induction period immediately following the initial exothermal peak. For the slag milled in air, the induction period lasts for about 20 days. Milling of the slag in CO2 results in higher intensity of the main heat evolution rate peak and larger cumulative hydration heat as compared to those for the slag milled in air. The compressive strength of the slag milled in CO2 is 12–14 MPa after the main hydration stage, whereas that of the slag milled in air is only about 1 MPa. This can be explained by the mechanically induced carbonization of the slag resulting in its higher reactivity and faster hydration relative to those for the slag milled in air.

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Acknowledgements

The calorimetric measurements were performed at the Centre for Thermogravimetric and Calorimetric Research of the Research Park of St. Petersburg State University.

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Authors and Affiliations

  1. Tananaev Institute of Chemistry - Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences, Akademgorodok 26a, Apatity, Murmansk Region, Russia, 184209

    Alexander M. Kalinkin, Basya I. Gurevich & Elena V. Kalinkina

  2. Saint Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, Russia, 199034

    Mikhail S. Myshenkov & Irina A. Zvereva

Authors
  1. Alexander M. Kalinkin
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  2. Basya I. Gurevich
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  3. Mikhail S. Myshenkov
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  4. Elena V. Kalinkina
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  5. Irina A. Zvereva
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Correspondence to Alexander M. Kalinkin.

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Kalinkin, A.M., Gurevich, B.I., Myshenkov, M.S. et al. A calorimetric study of hydration of magnesia-ferriferous slag mechanically activated in air and in CO2 atmosphere. J Therm Anal Calorim 134, 165–171 (2018). https://doi.org/10.1007/s10973-018-7439-9

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