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树脂离子交换法是一种有可能代替炭浆吸附法和锌粉置换沉淀法回收金的方法。一些研究中心一直在研究从碱性氰化物溶液中回收金的适用树脂。最近,发现烷基磷酸酯可以从碱性氰化物溶液中选择性地溶剂萃取金,这意味着在树脂基体上发生类似的化学过程也可能是有效的。在这方面,已经由聚苯乙烯-二乙烯基苯共聚物合成了聚苯乙烯支撑的膦酸酯树脂。根据树脂的官能团的化学性质,pH值、离子强度和温度等,确定了这些树脂吸附和解吸金的特性。提高离子强度能增加金在树脂上的吸附量,并且有令人满意的选择性。在较高温度和(或)解吸液较低离子强度的条件下,解吸是可能的。碱金属阳离子-氰亚金酸根阴离子所形成的离子对的溶剂化萃取,似乎可以解释金的吸附-解吸现象,本文通过各种因素的研究对此作了讨论。
Resin ion exchange method is a possible replacement of carbon adsorption and zinc powder replacement precipitation method of gold. Some research centers have been studying the use of resins that recover gold from alkaline cyanide solutions. Recently, it was found that alkyl phosphates can selectively solvent extract gold from a basic cyanide solution, which means that it may also be effective to have similar chemical processes on the resin matrix. In this regard, polystyrene-supported phosphonate resins have been synthesized from polystyrene-divinylbenzene copolymers. According to the chemical nature of the functional groups of the resin, the pH value, the ionic strength and the temperature, etc., the properties of these resins for adsorbing and desorbing gold are determined. Increasing the ionic strength increases the amount of gold adsorbed on the resin and has a satisfactory selectivity. Desorption is possible with lower ionic strength at higher temperature and / or desorption solution. The solvation of the ion pairs formed by the alkali metal cation-cyanurate anion seems to explain the adsorption-desorption of gold, which is discussed in this article by various factors.