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为了实现高温合金废料电解液中Re的高效回收,研究了D296强碱性阴离子交换树脂对高温合金电解液中Re的吸附规律和机制并探讨了最优工艺。通过静态试验考察了温度、酸度、时间对D296树脂吸附Re的影响;通过动态实验测定吸附和解吸曲线,并进行了电解液中所含离子对树脂吸附Re的影响实验。结果表明,D296树脂吸附Re的最佳温度为293 K,最佳酸度为pH 4.0~5.0。在此条件下,D296树脂对Re的静态和动态饱和吸附量分别为61.4和64.7 mg·g~(-1)。D296树脂对Re的吸附速率快,吸附反应速率常数为k=1.95×10~(-3)s~(-1),半交换期为t_(1/2)=355 s。反应的吸附焓变ΔH=-3.99 k J·mol~(-1),吸附反应为放热反应,可在常温下进行。选取用10%NH_4SCN作为解吸剂,解析率达98%以上,溶液中共存离子影响树脂对Re的吸附,且NO_3~-离子的存在比Cl~-离子更能干扰树脂对Re的吸附。
In order to achieve high recovery of Re in high temperature alloy waste electrolyte, the adsorption mechanism and mechanism of D296 strongly basic anion exchange resin on Re in high temperature alloy electrolyte were studied and the optimum process was discussed. The effects of temperature, acidity and time on the Re adsorption of D296 resin were investigated by static experiments. The adsorption and desorption curves were measured by dynamic experiments and the influence of the ions contained in the electrolyte on Re adsorption was investigated. The results showed that the best temperature for the adsorption of Re on D296 resin was 293 K and the optimum acidity was about pH 4.0 ~ 5.0. Under these conditions, the static and dynamic saturated adsorption capacities of D296 resin to Re are 61.4 and 64.7 mg · g -1, respectively. The adsorption rate of D296 resin to Re was high, the adsorption rate constant was k = 1.95 × 10 -3 s -1, and the half exchange period was t 1/2 (1/2) = 355 s. The enthalpy change of the reaction ΔH = -3.99 kJ · mol -1, the adsorption reaction is exothermic reaction, can be carried out at room temperature. When 10% NH_4SCN was used as the desorption agent, the resolution rate was more than 98%. The coexisting ions in the solution affected the adsorption of Re on the resin, and the presence of NO_3 ~ + ions interfered more with the adsorption of Re on the resin than Cl ~ - ion.