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层析X射线摄影法能得出金氰络合物在活性炭上吸附的目视结果。计算机辅助层析图像(CT)显示,金在大孔隙中的负载量是微不足道的,并且表明对于金氰络合物穿透进入活性炭的内部结构来说,表面扩散是主要的机理。这些图像还表明,在炭浆法(CIP)工厂中达到的典型的负载量时,金主要是吸附在活性炭的外表面上,并且薄膜扩散是限速机理。在较高的金负载量时,外表面的吸附质点呈饱和状态,再进一步的吸附就需要使已经吸附的金转移到活性炭的内部。为进行炭的活度试验,推荐使用的一些能导致产生薄膜扩散的条件,因为它们更能代表炭浆法(CIP)工厂中的条件。已制定出一种以溶剂萃取和气相摄谱法为基础的方法,用以分析在氰化浸出液中的浮选起泡剂IF50(三乙氧基丁烷,或简称TEB)的浓度。这种起泡剂能强烈地吸附在活性炭上,不仅会严重地降低金的平衡吸附量,而且更为重要的是还会影响金的吸附速率。
X-ray photography can be obtained by the cyanide cyanide complex adsorption on the activated carbon on the visual results. Computer-assisted tomography (CT) shows that the loading of gold in the macropores is negligible and shows that surface diffusion is the dominant mechanism for the influx of the cyanide complex into the internal structure of the activated carbon. These images also show that gold is mainly adsorbed on the outer surface of activated carbon at the typical loading reached in the CIP plant and that film diffusion is the rate limiting mechanism. At higher gold loadings, the adsorption mass on the outer surface is saturated, and further adsorption is required to transfer the adsorbed gold to the interior of the activated carbon. For carbon activity testing, some conditions that lead to film diffusion are recommended because they better represent the conditions in a CIP plant. A method based on solvent extraction and gas phase spectroscopy has been developed to analyze the concentration of the flotation blowing agent IF50 (triethoxybutane, or TEB) in a cyanide leach solution. This blowing agent strongly adsorbs on the activated carbon, which not only severely reduces the equilibrium adsorption capacity of the gold but, more importantly, also affects the gold adsorption rate.