The relationship between dissolution rate and pH is determined by carrying out dynamic experiments of hedenbergite and grossularite dissolution .The dissolution reaction equations are established .The dissolution proc...The relationship between dissolution rate and pH is determined by carrying out dynamic experiments of hedenbergite and grossularite dissolution .The dissolution reaction equations are established .The dissolution processes of two minerals are simulated by using the theory of multi-phase and mufti-component chemical equilibrium . 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 new metastable minerals can be formed in the system .The experiments showed that dissolution of grossularite and hedenbergite consumes H+ and then makes pH value of solution high . In turn , precipitation of metastable minerals makes pH value low .Precipitation of metastable minerals has a catalytic effect for dissolution of reacting minerals in special time .Precipitation and dissolution carried out alternately in the system and it causes periodic oscillation of pH values with reacting time . This is the dissipative structure or self-organization happened in the processes of mineral dissolution.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 of hedenbergite and grossularite dissolution .The dissolution reaction equations are established .The dissolution processes of two minerals are simulated by using the theory of multi-phase and mufti-component chemical equilibrium . 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 new metastable minerals can be formed in the system .The experiments showed that dissolution of grossularite and hedenbergite consumes H+ and then makes pH value of solution high . In turn , precipitation of metastable minerals makes pH value low .Precipitation of metastable minerals has a catalytic effect for dissolution of reacting minerals in special time .Precipitation and dissolution carried out alternately in the system and it causes periodic oscillation of pH values with reacting time . This is the dissipative structure or self-organization happened in the processes of mineral dissolution.
