辉铜矿、黄铜矿和斑铜矿的溶解动力学:Ⅰ.温度、pH和NaCl浓度的影响

KINETICS OF DISSOLUTION OF CHALCOCITE, CHALCOPYRITE AND BORNITE:Ⅰ.THE EFFECTS OF TEMPERATURE, pH AND NaCl CONCENTRATION

本文对辉铜矿、黄铜矿和斑铜矿在NaCl溶液中的溶解动力学进行了实验研究，在25～70℃，溶解反应活化能分别为辉铜矿36.46kJ／mol，黄铜矿44．05kJ／mol，斑铜矿51．96kJ／mol。温度、pH值和NaCl浓度对铜矿物的溶解作用有显著影响，文中分别建立了溶解速率与温度、pH值和NaCl浓度的函数关系。铜矿物的溶解作用受表面化学动力学机理的控制，且不同pH区间其控制步骤不同。最后探讨了动力学实验结果在砂岩铜矿成矿作用中的意义。

This paper studies experimentally the kinetics of dissolution oF chalcocite, chalcopyrite and bornite. Activation energy of reaction is 36. 46kJ/mol for chalcocite, 44. 05kJ/mol for chalcopyrite and 51. 96kJ/mol for bornite, respectively. Temperature 9 pH and NaCl concentration have great effects on the dissolution of copper minerals. The functions between dissolution rate and temperature, pH and NaCl ionic strength has been established respectively by means of experiments in this paper The dissolution of copper minerals is controlled by surface chemical kinetics and the controlling steps are different in various pH ranges. Finally, the significance of kinetic experiments in the ore deposition of sandstone-type copper deposits is also discussed.