Controls on differential leaching of calcium and aluminum from labradorite in dilute electrolyte solutions

Details Controls on differential leaching of calcium and aluminum from labradorite in dilute electrolyte solutions Controls on differential leaching of calcium and aluminum from labradorite in dilute electrolyte solutions

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3979m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 11, pp.3979-3985

Physics

4

Scientific paper

Close inspection of SIMS (secondary ion mass spectrometry) depth profiles reveals that consistently greater amounts of Ca, relative to Al, are removed from labradorite feldspar in response to dissolution in mildly acidic (pH 4) solutions of aqueous HCl. The result indicates that Ca and Al are removed from labradorite at different rates and by implication, different reaction mechanisms. The cation concentration of the leachant solution affects the relative proportions of Ca and Al removed from the solid. In particular, dissolved Al decreases the relative amount of Al removed. By contrast, dissolved Ca has no observable effect on the relative release rates of Ca and Al; it is apparent that Ca is removed from the lattice in advance of Al. The explanation may be that hydrolysis of the Si-Al oxide network is dependent upon the initial exchange reaction between hydrogen ions from solution and the charge balancing cations (Na, Ca, and/or K) in the feldspar. Only after sufficient protons have penetrated the Si-Al oxide framework will the framework metals (Al and/or Si) be released in substantial quantity. From this interpretation, it follows that cations in solution which diffuse into the lattice and exchange with the charge balancing cations may affect the rate of hydrolysis of the feldspar network.

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