Abstract The adsorption of tungsten by a macroporous weak base resin had been widely studied. However, due to the problem of the crystallization of ammonium paratungstate (APT) during the desorption process, there have been few detailed reports on subsequent steps after resin adsorption. The authors found that APT could be dissolved in ammonia in a closed container at 60 °C while achieving a high resin desorption rate, thus solving practical production problems. On this basis, the washing and desorption behavior of the high capacity ion exchange resin D314 was investigated. The lower sodium ion concentration after aeration washing indicated that the aeration washing could obtain a better washing result than the ordinary shaker shaking washing. The longer the washing time and the greater the number of washing times, the better the washing effect. Under the condition of a liquid-solid volume ratio of 1.25:1 and ammonia eluent of 150 g/L, the single desorption rate of saturated resin for 6 h could reach approximately 90% at 60 °C. A desorption rate of >99% could be achieved by multiple desorption. The industrial processes were designed to achieve the normal operation of resin desorption and the washing solution circulation. Backscattering SEM and EDS were applied to study the distributions of sodium and tungsten before and after the saturated resin treatment.

中文翻译：

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提高吸附钨弱碱树脂的洗涤和解吸性能

摘要 大孔弱碱树脂对钨的吸附已得到广泛研究。然而，由于解吸过程中仲钨酸铵（APT）结晶的问题，树脂吸附后后续步骤的详细报道很少。作者发现 APT 可以在 60°C 的密闭容器中溶解在氨中，同时实现较高的树脂解吸率，从而解决了实际生产问题。在此基础上，研究了高容量离子交换树脂D314的洗涤和解吸行为。曝气洗涤后较低的钠离子浓度表明曝气洗涤比普通摇床振荡洗涤可以获得更好的洗涤效果。洗涤时间越长，洗涤次数越多，洗涤效果越好。在液固体积比为1.25:1、氨淋洗液为150 g/L的条件下，60℃下饱和树脂6h单次解吸率可达90%左右。通过多次解吸可以达到 >99% 的解吸率。工业过程的设计是为了实现树脂解吸和洗涤液循环的正常运行。应用背散射扫描电镜和能谱仪研究饱和树脂处理前后钠和钨的分布。工业过程的设计是为了实现树脂解吸和洗涤液循环的正常运行。应用背散射扫描电镜和能谱仪研究饱和树脂处理前后钠和钨的分布。工业过程的设计是为了实现树脂解吸和洗涤液循环的正常运行。应用背散射扫描电镜和能谱仪研究饱和树脂处理前后钠和钨的分布。