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| 高温下金与石英的相互作用及其对浸金过程的影响 |
| Interaction between Gold and Quartz at High Temperature and Its Effect on the Gold Leaching Process |
| Received:February 17, 2020 |
| DOI： |
| 中文关键词: 金 石英 焙烧 活化 机理 第一性原理 |
| 英文关键词: gold quartz calcination activation mechanism first principles |
| 基金项目:国家自然科学基金项目(No.51574146) |
| Author Name | Affiliation | E-mail | | LIU Shu-jie | School of Mineral Engineering, University of Science &
Technology Liaoning, Anshan 114051, Liaoning, China | 18341263876@163.com | | DAI Shu-juan | School of Mineral Engineering, University of Science &
Technology Liaoning, Anshan 114051, Liaoning, China | shujuandai@163.com | | LI Peng-cheng | School of Mineral Engineering, University of Science &
Technology Liaoning, Anshan 114051, Liaoning, China | |
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| 中文摘要: |
| 金在高温下可能与石英及硅酸盐类矿物相互作用，导致焙烧后矿石中金回收难度增大。于不同温度(600℃~750℃)和时间(1~4 h)条件下对石英-硫化矿-金粉混合物进行焙烧，考察焙烧渣中金的氰化浸出率。结果表明，高温会活化石英并与金相互作用，导致焙烧渣中的金难以被氰化物浸出。第一性原理计算表明，金原子在石英(101)表面的吸附能为-300.01 kJ/mol，Au-1与石英表面的Si-12距离为0.2264 nm，石英表面Si-12的电子转换到Au-1原子上，布居值和键长数据显示金原子与石英(101)表面的硅原子存在键合作用，印证了焙烧试验结果。 |
| 英文摘要: |
| Gold likely interacts with quartz and silicate minerals at high temperature, making it more difficult to recover gold from the ore after roasting. A quartz-sulfide ore-gold powder mixture was roasted at different temperatures (600°C~750°C) and time (1~4 h) to investigate the cyanide leaching rate of gold in the roasting residue. The results show that quartz will be activated and interact with gold at high temperatures, making it difficult for gold in the roasting slag to be leached by cyanide. First-principles calculations show that the adsorption energy of Au atom on quartz (101) surface is -300.01 kJ/mol, and that the distance between Au-1 and Si-12 on quartz surface is 0.2264 nm, and that the electrons of Si-12 on quartz surface are converted to Au-1 atom. The population and bond length show that there is a bond between gold atoms and silicon atoms on the surface of quartz (101), which confirms the sintering test results. |
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