Pressure oxidation (POX) is an effective method for base metal extraction and a pretreatment of refractory gold ores. A residue from pressure leaching of chalcopyrite concentrate was collected and investigated for gold recovery and deportment of metals. A comprehensive mineralogical analysis and gold deportment study were conducted using techniques including X-ray diffraction (XRD), optical microscope, scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDX), and dynamic secondary ion mass spectrometry (D-SIMS). Gold leaching tests were performed using cyanide and glycine as lixiviants. The gold grade is 3.1 g/t, with 0.31% residual copper in the sample. Hematite was a dominant iron oxide (31.5%), and iron sulfate salts (45.4%) existed in various minerals phases. The gold deportment study revealed that 32.3% of the total gold was present as a visible gold, and the remainder was sub-microscopic gold. The visible gold was native gold with an average particle size of less than 20 μm. Colloidal gold, the dominant existence of invisible gold, was found in hematite, jarosite, and iron sulfate. Hematite was the major sub-microscopic gold carrier, forming a nonporous rimmed structure and locking gangue minerals randomly. Gold in arsenopyrite was found as solid-solution, accounting for 7.2%. Gold extraction of 84% was achieved by 500 mg/L NaCN, while only 35% of gold was extracted by 100 mg/L NaCN. A significant synergistic effect of cyanide and glycine was observed. The addition of glycine in cyanide leaching solution boosted the gold leaching kinetics and recovery. Gold recovery of 85% was observed with 100 mg/L NaCN and 0.3 M glycine in 24 h. In the hybrid leaching system, copper was stabilized by glycine and further utilized as a catalyst for gold leaching. To achieve higher gold extraction and lower lime consumption, a product with high sulfur oxidation degree and low iron sulfate content is preferable in pressure oxidation operation. Hematite is a stable product and does not impair gold leaching.

压力氧化（POX）是一种用于贱金属提取和预处理难处理金矿石的有效方法。收集了黄铜矿精矿的压力浸出残余物，并研究了金的回收和金属的去除。使用包括X射线衍射（XRD），光学显微镜，带能量色散X射线光谱仪（SEM-EDX）的扫描电子显微镜和动态二次离子质谱仪（D-SIMS）等技术进行了全面的矿物学分析和金矿化研究）。使用氰化物和甘氨酸作为助剂进行了金浸出测试。金品位为3.1 g / t，样品中残留铜0.31％。赤铁矿是主要的氧化铁（31.5％），硫酸铁盐（45.4％）存在于各种矿物相中。黄金仪态研究显示32。总金的3％以可见金的形式存在，其余为亚显微金。可见金是平均粒径小于20μm的天然金。在赤铁矿，黄铁矿和硫酸铁中发现了胶体金，这是无形金的主要存在。赤铁矿是主要的亚显微金载体，形成无孔的边缘结构并随机锁住脉石矿物。发现毒砂中的金为固溶体，占7.2％。500 mg / L NaCN的金提取率为84％，而100 mg / L NaCN的金提取率为35％。观察到氰化物和甘氨酸具有显着的协同作用。在氰化物浸出液中添加甘氨酸可提高金的浸出动力学和回收率。用100 mg / L NaCN和0.3 M甘氨酸在24小时内观察到85％的金回收率。在混合浸出系统中，铜被甘氨酸稳定化，并进一步用作金浸出的催化剂。为了获得更高的金提取量和更低的石灰消耗量，在压力氧化操作中优选具有高硫氧化度和低硫酸铁含量的产物。赤铁矿是一种稳定的产品，不会损害金的浸出。