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Nutrient release from K-feldspar ore altered in hydrothermal conditions

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Abstract

The development of potash materials from local K-bearing resources such as aluminosilicate minerals is desirable to overcome reliance on imported fertilizers in tropical countries. However, the nutrient release from such materials follows a time-dependent profile that is not well-understood and that is significantly different if probed at agronomic or geological timescales. This work investigates the nutrient release from a calcium–aluminum–silicate-hydrate (C–A–S–H) material obtained via hydrothermal alteration of K-feldspar ore and CaO. The C–A–S–H hydrothermal material is subjected to sequential leaching cycles with diluted HNO3 (initial pH = 5), renewing the leaching solution at every cycle. X-Ray Powder Diffraction (XRD) is used to monitor changes in the material mineralogy as the leaching progresses, showing a relative increase of calcite (up to 7 wt%) and amorphous phase (up to 23 wt%). Inductively Coupled Plasma Mass Spectrometry (ICP-MS) of the leachates is used to monitor the release of K, Ca, Si and Al, and shows that the material releases K nutrient at every leaching cycle. The pH of the leachates shows that as the content of calcite in the material increases a buffering capacity at pH ≈ 9.6 is developed by the material. The mineralogy, nutrient release, and pH results presented in this study suggest a potential application of the material as a slow release fertilizer when compared to KCl. Experimental results also imply that kinetic parameters rather than solubility are more suited to describe the fertilizer value of silicate materials.

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Acknowledgements

Dr. Steve Miller (H&M Analytics) is acknowledged for collection of X-ray powder diffraction data and Rietveld refinements.

Funding

Funding has been received from Advanced Potash Technologies.

Author information

Correspondence to Davide Ciceri.

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Conflict of interest

Advanced Potash Technologies, a commercial company, provided funding for this research in the form of salaries for the authors, equipment, and materials. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The funder is developing a commercial product based on the research presented in this article. The funding of this work was subjected to the terms set forth by the Office of Sponsored Programs at the Massachusetts Institute of Technology (http://osp.mit.edu).

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Ciceri, D., Allanore, A. Nutrient release from K-feldspar ore altered in hydrothermal conditions. Chem. Pap. 74, 431–440 (2020) doi:10.1007/s11696-019-00887-7

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Keywords

  • Calcium–aluminum–silicate–hydrate (C–A–S–H)
  • K-feldspar
  • Hydrothermal processing
  • Potash
  • Slow release fertilizers