Abstract
The concentration of dissolved F did not change in long-term (four months) experiments on the interaction of crushed limestone and marl with water (at R/W = 1) at room temperature. The comparison of the activity products and equilibrium constants of the mineral dissolution reactions indicates that the experimental solutions were undersaturated with respect to fluorite and oversaturated with respect to F-apatite. The long-term existence of such unequilibrated solutions is explained by the steady state of the system at which the primary F-bearing mineral (fluorite, mica, or palygorskite) is transformed into a secondary one (F-apatite). The dissolved F concentration is controlled under these conditions by the ratios of the dissolution reaction rates for the primary mineral and the precipitation rate of the secondary one.
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