Add time:08/20/2019         Source:sciencedirect.com

The solubility of gibbsite was measured at 35 and 80°C, and the solubility of portlandite was measured at 25, 35, and 80°C, each as a function of pH and malonate concentration. The gibbsite solubility data can be satisfactorily modelled using only one aqueous Al-malonate species. The data rule out all possible Alp(OH)q(Mal)r3p−q−2r and Alp(OH)q(HMal)r3p−q−r stoichiometries except Al(Mal)2− and Al(OH )2(HMal)2, each of which provides an excellent fit to all of the experimental solubility data. If Al(Mal)2− is the dominant species, the data constrain the value for the log of the dissociation constant of Al(Mal)2− to be −11.3 ± 1.0 and −14.5 ± 0.5 at 35 and 80°C, respectively. If Al(OH)2(HMal)2− is the dominant species, the values of its dissociation constant at 35°C and at 80°C are −27.3 ± 1.0 and −27.6 ± 0.5, respectively. The portlandite solubilities indicate that Ca(Mal)0 is the dominant Ca-malonate complex, with values for the log of the dissociation constant of Ca(Mal)0 of −2.4 ± 0.3, -2.4 ± 0.3, and −2.9 ± 0.3, at 25, 35, and 80°C, respectively. Thermodynamic modelling, using these results, indicates that Al-malonate complexation can potentially enhance the solubility of Al-bearing minerals by up to five orders of magnitude.

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