氰化浸出体系中金的溶剂萃取

本文评述了金的碱性氰化溶液溶剂萃取研究与开发工作的最新进展。包括改性胺，季铵盐，磷氧化物及胍类萃取剂等。     

某含砷浮选金精矿的细菌氧化预处理-氰化提金试验研究

云南省某含砷难浸金精矿，常规氰化金浸出率仅为26．17％，通过采用细菌氧化预处理后，金浸出率达到98．25％，获得了非常理想的试验指标。     

Cyanidation kinetics of silver telluride (Ag2Te)

The extraction of precious metals from tellurides by cyanidation is more difficult than when they are in their native form, nevertheless the reason for their refractory nature has not been adequately supported. In this study, the mechanism of the cyanidation kinetics of silver telluride (Ag₂Te) was investigated. For this purpose, cyanidation experiments were carried out to: (1) study the difference between the cyanidation kinetics of elemental silver and silver telluride; (2) study the effect of temperature (i.e. 20, 25, 27, 30, 35 and 40°C) on silver telluride dissolution; and (3) elucidate the kinetic mechanism of the silver telluride cyanidation. The results obtained showed that: (1) while 83.5% of elemental silver was dissolved in 8?h, only 13.2% of silver from silver telluride was dissolved in the same time; (2) temperature has an important effect on silver extraction from silver telluride, but a minor effect on tellurium dissolution; and (3) at temperatures between 20 and 27°C, the process was controlled by the chemical reaction with an apparent activation energy of 191.9?kJ?mol^?1, whereas at temperatures between 30 and 40°C, the process was controlled by diffusion through a Ag₅Te₃ layer of products with an apparent activation energy of 25.2?kJ?mol^?1.     

生物氧化—氰化炭浸提金工艺的优化改造

对三和金业生物氧化—氰化炭浸提金工艺进行了优化改造。通过优化生物氧化作业参数,使其处理能力提高了42.49 t/d;增设氧化洗涤液二段沉淀回收高品位含金微细氧化渣、采用二段沉淀—压滤工艺回收粉炭、增设摇床重选工艺回收氰渣中的金等,金的总回收率提高了0.46%。企业年增产黄金884.4 kg,取得了显著的经济效益。     

药剂预处理金精矿氰化工艺研究与实践

对河台金矿金精矿氰化工艺,通过采用药剂X预处理的方法,提高了氰化浸出速度,优化了相关作业条件,增加了氰化处理能力。同时该法使用后,降低了材料消耗与处理成本,提高企业经济效益。     

紫金山金矿提金工艺研究与探讨

介绍了紫金山金矿采用堆浸、全泥氰化提金试验的原则流程和结果，对堆浸－全泥氰化联合提金试验和原则流程合理性进行了初步分析和探讨，并对该矿提金工艺提出了看法，可供现有提金选矿厂改造和新建提金破厂设计参考。     

黄金冶炼氰渣火法处理研究现状及展望

焙烧氰化尾渣是含金硫化矿氰化法提金产生的固废,占氰渣总量的50%以上。其中的金被铁矿石和脉石包裹,采用火法回收工艺才可有效回收金和铁。目前的火法回收工艺有氯化挥发焙烧法回收金银、还原焙烧—磁选法回收铁、氰渣-铜精矿协同冶炼同时回收金和铁。氰渣-铜精矿协同冶炼法具有高效性、经济性和环保性,前景更加广阔。     

焙烧方式对含砷金精矿中金、银浸出率的影响

某含砷金精矿中金矿物嵌布粒度较细,金主要以硫化物(黄铁矿、毒砂)包裹金形式存在。采用焙烧预处理-氰化浸出工艺,研究了一段焙烧、两段焙烧和添加剂焙烧对氰化浸出的影响。结果表明,采用常规一段、两段焙烧方式,金浸出率均未达到90%,银浸出率低于50%; 添加剂焙烧效果显著,在焙烧温度650 ℃、时间1.0 h、添加剂用量NaXY 100 kg/t+YC-1 20 kg/t的条件下,金浸出率达到93.56%,银浸出率达62.45%。     

黔西南某高砷金矿中金的氰化实验研究

黔西南某高砷金矿中金的品位为3 g/t～30 g/t,砷的质量分数在8%～18%范围变化。金呈细粒和微细粒的形式存在,部分金为硫化物,脉石矿物包裹。金的氰化浸出率为50%～60%。砷金矿与催化溶液参与化学反应后,在选择条件下,金的氰化反应浸出率为82%～91%。使得金矿有较好的经济效益和社会效益。