银和金的选择吸附实验研究及意义

Experimental study on selective adsorption behaviors of silver and gold, and its significance

吸附作用被认为是低温表生矿床的一种重要的成矿机制。文章内多种矿物对银和金的吸附实验表明,呈纳米粒级的银和金的单质对自然界矿物的吸附有明显的选择性,尤其是银对方铅矿和金对黄铁矿的强选择吸附,与自然界的实际情况符合得很好。这一实验结果为解释许多矿床中方铅矿常作为银的载体矿物及黄铁矿常作为金的载体矿物提供了科学依据。实验还证明了粘土、有机质和黑色页岩对银和金的吸附作用。

Adsorption is regarded as an important metallogenic mechanism for the supergene and epithermal ore deposits. A series of experiments were made on the capabilities of a variety of minerals to adsorb silver and gold, and the results show that the nano-sized native silver and gold are strongly selective to naturally occurring minerals. It is especially notable that silver shows a strongly selective adsorption tendency toward galena and gold toward pyrite, which is in good consistency with what is observed in nature. This experimental result provides the basis for interpreting the phenomenon that galena acts as the Ag-carrier mineral and pyrite as the Au-carrier mineral in lots of ore deposits. The experiment also indicates that clay, organic matter and black shale are obviously capable of adsorbing silver and gold.