The relationship between dissolution rate and pH is determined by carrying out dynamic experiments ofhedenbergite and grossularite dissolution.The dissolution reaction equations are established.The dissolution pro-ces...The relationship between dissolution rate and pH is determined by carrying out dynamic experiments ofhedenbergite and grossularite dissolution.The dissolution reaction equations are established.The dissolution pro-cesses of two minerals are simulated by using the theory of multi-phase and multi-component chemicalequilibrium.The results bring light to the mechanism of dissolution processes.Due to incongruent dissolution of two minerals when the dissolution processes reach a metastable supersaturation critical point newmetastable minerals can be formed in the system.The experiments showed that dissolution of grossulariteand hedenbergite consumes H^+and then makes pH value of solution high.In turn,precipitation ofmetastable minerals makes pH value low.Precipitation of metastable minerals has a catalytic effect for disso-lution of reacting minerals in special time.Precipitation and dissolution carried out alternately in the systemand it causes periodic oscillation of pH values with reacting time.This is展开更多
基金The project is supported by the National Nature Science Foundation of China
文摘The relationship between dissolution rate and pH is determined by carrying out dynamic experiments ofhedenbergite and grossularite dissolution.The dissolution reaction equations are established.The dissolution pro-cesses of two minerals are simulated by using the theory of multi-phase and multi-component chemicalequilibrium.The results bring light to the mechanism of dissolution processes.Due to incongruent dissolution of two minerals when the dissolution processes reach a metastable supersaturation critical point newmetastable minerals can be formed in the system.The experiments showed that dissolution of grossulariteand hedenbergite consumes H^+and then makes pH value of solution high.In turn,precipitation ofmetastable minerals makes pH value low.Precipitation of metastable minerals has a catalytic effect for disso-lution of reacting minerals in special time.Precipitation and dissolution carried out alternately in the systemand it causes periodic oscillation of pH values with reacting time.This is
