Chlorite dissolution kinetics at pH 3–10 and temperature to 275°C

摘要: Abstract Sheet silicates and clays are ubiquitous in geothermal environments. Their dissolution is of interest because this process contributes to scaling reactions along fluid pathways alteration fracture surfaces which could affect reservoir permeability. In order better predict the geochemical impacts on long-term performance engineered systems, we have measured chlorite developed a generalized kinetic rate law applicable over an expanded range solution pH temperature. Chlorite, (Mg,Al,Fe) 12 (Si,Al) 8 O 20 (OH) 16 , commonly occurs many host rocks as either primary mineral or product. A combination new data from study (collected using Mg-rich variety, at 100–275 °C pH > 5.5) well all available published datasets results equation that valid temperatures 25–275 °C 3 ≤ pH ≤ 10: R = 1 ⋅ 10 − 4 e 30 RT H + 0.74 4.7 11 13 1.5 9 15 0.43 Δ G r The form equation, includes reaction affinity term slow equilibrium approached, can be incorporated into most existing reactive transport codes for use prediction rock–water interactions systems.