Trichloroisocyanuric acid (TCCA), which is used for gold leaching, is an alternative to cyanidation due to its lower toxicity and higher efficiency. This study investigated the gold recovery procedures from highly effective chloride leaching solution using the D301 resin. This approach prevented the inhibition of gold adsorption when using activated carbon. Herein, the optimal conditions for gold adsorption were discussed, including establishing adsorption kinetics and isotherms, and calculating adsorption activation energy. Additionally, SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infrared Spectroscopy), and XPS (X-ray Photoelectron Spectroscopy) techniques were used to reveal the mechanism of gold adsorption using D301 resin. Under optimal conditions (pH 4.0, temperature 25 °C, time 120 min), an average adsorption percentage of 99.2% was achieved. Analysis of the adsorption data confirmed that gold adsorption followed the pseudo-second-order kinetic model and Freundlich adsorption isotherm. The calculated activation energy was 9.69 kJ mol−1, indicating a predominance of physical adsorption involving ion exchange reactions with protonated tertiary amine groups in the D301 resin beads. Furthermore, among various eluents tested in desorption experiments, a solution containing a mixture of thiourea and hydrochloric acid with 0.4 mol L−1 and 0.8 mol L−1, respectively, demonstrated superior efficiency, achieving a successful desorption percentage reaching 95.7 ± 0.3% within 80 min. After three cycles of resin regeneration, the regeneration efficiency reached 91.2% while maintaining an average adsorption percentage of 95.3%.

中文翻译：

---

使用 D301 阴离子交换树脂从 TCCA 的氯化物浸出液中回收金，并用硫脲洗脱


用于金浸出的三氯异氰尿酸 （TCCA） 因其毒性较低、效率较高，是氰化的替代品。本研究调查了使用 D301 树脂从高效氯化物浸出溶液中回收金的程序。这种方法防止了使用活性炭时对金吸附的抑制。本文讨论了金吸附的最佳条件，包括建立吸附动力学和等温线，以及计算吸附活化能。此外，使用 SEM （扫描电子显微镜）、FTIR （傅里叶变换红外光谱） 和 XPS （X 射线光电子能谱） 技术揭示了使用 D301 树脂吸附金的机制。在最佳条件下（pH 4.0，温度 25 °C，时间 120 min），平均吸附率达到 99.2%。吸附数据分析证实，金吸附遵循准二级动力学模型和 Freundlich 吸附等温线。计算出的活化能为 9.69 kJ mol-1，表明物理吸附占主导地位，涉及与 D301 树脂珠中质子化叔胺基团的离子交换反应。此外，在解吸实验中测试的各种洗脱液中，含有硫脲和盐酸混合物的溶液分别具有 0.4 mol L-1 和 0.8 mol L-1，表现出优异的效率，在 80 分钟内成功达到 95.7 ± 0.3% 的解吸百分比。经过 3 次树脂再生循环后，再生效率达到 91.2%，同时保持 95.3% 的平均吸附率。