The incongruent dissolution of scorodite — Solubility, kinetics and mechanism
作者： Marie-Claude Bluteau , George P. Demopoulos
DOI: 10.1016/J.HYDROMET.2007.03.003
关键词: Chemistry 、 Solubility 、 Dissolution 、 Solubility equilibrium 、 Adsorption 、 Inorganic chemistry 、 Arsenate 、 Scorodite 、 Ferrihydrite 、 Hydrometallurgy
摘要: Abstract This work reports the results of a laboratory investigation on long-term stability crystalline scorodite conducted at fixed pH (5–9) and temperature (22 °C, 50 °C 75 °C). The used in this was prepared via hydrothermal synthesis procedure. dissolution 22 °C found to be extremely slow. At neutral pH, arsenic concentration stabilized after 24 weeks 5.9 mg/L. Analysis solubility data as function yielded model equation. product recalculated 10 − 25.4 using generated by study geochemical code PHREEQC for solution modelling. As dissolved, iron re-precipitated 2-line ferrihydrite. growth re-crystallization ferrihydrite apparently retarded arsenate adsorption. rate modeled with decreasing exponential initial approached first order dependency OH − while apparent activation energy suggested that is chemically controlled.
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