Natural fluorapatite dissolution kinetics and Mn and Cr metal removal from sulfate fluids at 35 °C.

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ID: 90683
2020
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Abstract
In light of the consequences of global warming and population growth, access to safe drinking water becomes an ever greater challenge, in particular in low to middle income countries in arid regions. Moreover, mining which may cause acid mine drainage and heavy metal contamination puts further pressure on management of limited water resources. Hence, the development of cost effective water treatment methods is critical. Here, using batch reactor experiments we investigate the kinetics and mechanisms behind divalent Mn and trivalent Cr removal from sulfate fluids using natural fluorapatite at 35 °C. The results show that the fluorapatite dissolution rate depends on fluid pH, and that dissolution is the dominant mechanism in fluids with pH below 4. Apatite can thus serve as remediation to neutralize acidic fluids. Fluid pH of 4-6 triggers a dissolution-precipitation mechanism, in some cases following upon a dissolution-only period, with the formation of a metal phosphate. In these experiments, Cr removal is two to ten times faster than Mn removal given similar solution pH. The results demonstrate that natural apatite represents a promising, cost effective material for use in passive remediation of mining-induced contamination of soils and groundwater in arid regions.
Reference Key
vandeginste2020naturaljournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Vandeginste, Veerle;Cowan, Charlotte;Gomes, Rachel L;Hassan, Tharwat;Titman, Jeremy;
Journal Journal of hazardous materials
Year 2020
DOI
S0304-3894(20)30138-2
URL
Keywords
heavy metals removal efficiency acid mine drainage apatite arid dissolution and precipitation

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