金在表生作用中的富集模拟实验及地球化学意义

利用Fe_2O_3、MnO、SiO_2和粘土矿物(高岭土、膨润土、海泡石、凹凸棒石)等,在常温常压下对配制的不同pH的金标准溶液(1ppm±)进行了吸附实验。实验证明,各种酸碱度条件下,它们对金都有强烈的吸附作用,吸附量最大的是Fe_2O_3,最小的为SiO_2但在不同的pH条件下,物质对金的吸附序列不尽相同。据此,本文对实验结果,吸附机制及实验的地球化学意义进行了讨论。

Simulating experiments on the concentration of gold in supergene condition and its significance for geochemistry

The adsorptions of gold on Fe2O3,MnO, SiO2 and clay minerals in the solution of different pH values at normal temperatures and pressures have been experimented. The results of the experiments show that the adsorptivities of these adsorbents for gold are much great at different pH valeus. Of all the substances, the adsorptivity of Fe2O3 is the highest and SiO2 the lowest, however at different pH values, the adsorptive sequence of adsorbents is different. This paper has made a discussion on the results of the experiments, adsorptive mechanism and the significance of experiment for geochemistry.