A cost-effective and simple hydrometallurgy procedure for recycling the diamond core drilling crowns by nitric acid leaching, followed by the sodium hydroxide leaching, has been developed. The effect of temperature, nitric acid/sodium hydroxide concentration, leaching time and stirring rate were studied. For the acid leaching process the optimal values for parameters were 60 °C, 1.0 M HNO₃, 2.5 h, and 800 rpm. It has been noted that the key factors in the alkaline leaching process were temperature and NaOH concentration. For the alkaline leaching, the optimal parameters were 100 °C, 40% concentration of NaOH solution, and leaching time of 4 h. Identification and characterisation of products in all technological processes were performed by X-Ray Diffraction (XRD), scanning electron microscope using energy-dispersive X-ray spectroscopy (SEM-EDS), and laser desorption ionisation mass spectrometry (LDI-MS). The analysis of solutions in all phases was performed by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The use of LDI-MS as a new approach to identify the products after phases in the recycling process was an important part of the study, and the results were consistent with the XRD analysis. The total tungsten recovery was over 95.6%, with a high purity of the obtained tungsten trioxide.

已经开发出一种经济高效且简单的湿法冶金程序，用于通过硝酸浸出和氢氧化钠浸出来回收金刚石取芯钻冠。研究了温度、硝酸/氢氧化钠浓度、浸出时间和搅拌速度的影响。对于酸浸过程，参数的最佳值为 60 °C，1.0 M HNO ₃、2.5 小时和 800 rpm。已经注意到碱浸过程中的关键因素是温度和NaOH浓度。对于碱浸，最佳参数为 100 ℃、40% NaOH 溶液浓度和 4 h 浸出时间。所有工艺过程中的产品鉴定和表征均通过 X 射线衍射 (XRD)、使用能量色散 X 射线光谱 (SEM-EDS) 的扫描电子显微镜和激光解吸电离质谱 (LDI-MS) 进行。通过电感耦合等离子体原子发射光谱 (ICP-AES) 对所有相中的溶液进行分析。使用 LDI-MS 作为识别回收过程中相后产物的新方法是研究的重要组成部分，结果与 XRD 分析一致。