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Mine Water and the Environment

, Volume 36, Issue 2, pp 264–272 | Cite as

Using Calcium Carbonate/Hydroxide and Barium Carbonate to Remove Sulphate from Mine Water

  • Vhahangwele Akinwekomi
  • Johannes P. Maree
  • Christian Wolkersdorfer
Technical Article

Abstract

This study evaluated the effectiveness of using barium bicarbonate to remove sulphate from neutralized AMD. The Ba(HCO3)2 was produced by dosing a BaCO3 solution with CO2 to form Ba(HCO3)2. This greatly increased the barium ion concentration, which rapidly removed sulphate linked to either calcium or magnesium. Following sulphate removal, the Ca(HCO3)2 or Mg(HCO3)2 containing water can be stabilised by CO2 stripping with air, which results in CaCO3 precipitation. The MgCO3 remains in solution.

Keywords

Acid mine drainage Sulphate removal Water treatment Solubility Precipitation 

Die Nutzung von Calciumkarbonat/-hydroxid und Bariumcarbonat zu Fällung von Sulfaten in Bergbauabwasser

Zusammenfassung

In dieser Studie wird die Effektivität des Einsatzes von Bariumbicarbonat bei der Fällung von Sulfat zur Neutralisation von saurem Grubenwasser untersucht. Ba(HCO3)2 wird durch die Einleitung von CO2 in BaCO3-Lösung erzeugt. Durch erhöhte Bariumkonzentrationen wird Sulfat, welches an Calcium und Magnesium gebunden ist, gefällt. Nach dem Sulfatentzug, wird das Ca(HCO3)2- bzw. Mg(HCO3)2-haltige Wasser durch CO2-Entzug (Luft-Stripping-Verfahren) stabilisiert, was zur CaCO3-Fällung führt. MgCO3 verbleibt in der Lösung.

Aplicación de carbonato/hidróxido de calcio y bicarbonato de bario para el tratamiento de agua de mina

Resumen

Se necesitan soluciones para el tratamiento de AMD. Este estudio se focalizó en la evaluación de la efectividad de usar bicarbonato de bario para la remoción de sulfato en AMD neutralizada. Ba(HCO3)2 se produjo dosificando una solución de BaCO3 con CO2. La carbonatación de BaCO3 incrementó la concentración de iones bario en solución debido a la formación de Ba(HCO3)2 que puede ser usado para una rápida remoción de sulfato cuando éste está asociado tanto a calcio como a magnesio. Luego de la remoción de sulfato con Ba(HCO3)2, el contenido en agua de Ca(HCO3)2 o Mg(HCO3)2 puede estabilizarse usando burbujeo de CO2 con air, resultando en la precipitación de CaCO3 mientras MgCO3 permanece en solución.

利用碳酸钙/氢氧化钙和碳酸钡去除矿井废水中硫酸盐

摘要

评价了重碳酸钡去除酸性废水中硫酸盐的效率。通过投入含CO2的BaCO3溶液生成Ba(HCO3)2。该反应大幅提高钡离子浓度,从而可以快速去除钙和镁硫酸盐。硫酸盐去除之后,减少溶液CO2浓度,含有Ca(HCO3)2 或 Mg(HCO3)2的溶液将生成CaCO3沉淀,而MgCO3仍保留于溶液。

Notes

Acknowledgements

The authors gratefully acknowledge financial support from the National Research Foundation, which has provided funding for Tshwane University of Technology projects through the Technology and Human Resources for Industry Programme (THRIP) and Rand Water for activities falling under the Rand Water Chair in Water Utilisation. We also thanks Dave Katlekgo Mpholoane and Makoena Sebone for their assistance with the laboratory work and Caliphs Zvinowanda for comments on an earlier version of this paper.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Vhahangwele Akinwekomi
    • 1
  • Johannes P. Maree
    • 2
  • Christian Wolkersdorfer
    • 1
    • 3
    • 4
  1. 1.Tshwane University of TechnologyPretoriaSouth Africa
  2. 2.Phillert TrustPretoriaSouth Africa
  3. 3.SARChI Chair for Acid Mine Drainage TreatmentTshwane University of TechnologyPretoriaSouth Africa
  4. 4.Finnish Distinguished Professor for Mine Water Management, Laboratory of Green ChemistryLappeenranta University of Technology (LUT)MikkeliFinland

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