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研究金在碘-碘化物浸出液中的溶解热力学平衡和动力学,着重研究pH值和温度对体系的影响。水溶液中碘的热力学分析结果表明,多种形式的碘化物主要存在于pH值为酸性的区间。体系电势的增加导致碘化物种类的增加,碘元素的添加能提高体系的氧化电位。IO~(3-)离子能稳定存在于电势范围为-2.0至-0.75 V和pH值大于12.1的区间。提高温度会使各种碘化物在酸性pH区间存在的边界线发生移动,其中一些碘化物变得不稳定。扩散系数和扩散边界层厚度的测量值以及圆盘表面的溶剂质量浓度(14 mg/L)分析表明,浸出过程在外层扩散区域进行。因此,当选择碘化物浸出含金物料时,浸出过程必须在pH值为酸性区间内进行,在这些区间I~-、I_3~-和IO_4~-离子能和金属形成配合物。
The thermodynamic equilibrium and kinetics of gold dissolution in iodine-iodide leachate were studied, with emphasis on the effect of pH and temperature on the system. The results of thermodynamic analysis of iodine in aqueous solution show that various forms of iodide are mainly present in the acidic pH range. The increase of system potential leads to the increase of iodide species. The addition of iodine can increase the oxidation potential of the system. IO ~ (3-) ions can stably exist in the potential range of -2.0 to -0.75 V and pH value of more than 12.1 interval. Increasing the temperature moves the boundaries of various iodides present in acidic pH intervals, some of which become unstable. Diffusion coefficients and diffusive boundary layer thickness measurements, as well as disk surface solvent mass concentration (14 mg / L), show that the leaching process takes place in the outer diffusion zone. Therefore, when iodide is selected to leach the gold-bearing material, the leaching process must be carried out at a pH within the acidic range where the I-, I3- and IO4- ions can form complexes with the metal.