有机质与金相互作用的实验研究

用实验方法研究了含原油水溶液、油田卤水、腐植酸、脂肪酸、氨基酸及无水体系中原油对金的络合及迁移作用。结果表明,原油、腐植酸对金有很强的络合能力,水溶液中含少量的原油即可大大提高水溶液对岩石中金的淋滤活化能力。沉积地层成岩过程中产生的低熟有机质可能是促进沉积改造型金矿床矿源层中金活化迁移的重要因素。

EXPERIMENTAL STUDY ON INTERACTION BETWEEN ORGANIC MATTERS AND GOLD

This paper deals with interaction between organic matters and gold from experimental. data in three aspects: 1. Leaching of gold from rock by water solution containing organic matters such as crude oil, fat acid, amino acid, and humic acid; 2. Solubilities of gold-organic complexes in water solutions at temperture 25-200℃; 3. Migration of gold by oil in the system without water at temperture 200-300℃ and pressure 200-500 ×105 Pa. The results suggest that organic matters may play an important role in mobilization and migration of gold under certain conditions. Crude oil has high ability to extract gold from water solutions, which decreases with increasing temperture. These organic matters of complex composition and structure such as crude oil and humic acid have higher abilities to combine with gold than simple fat acid and amino acid. The ability of water solutions with a little organic matter will increase to leach gold. Crude oil can extract little gold from rocks in the system without water at room temperature, but it may play an important role in mobilization and migration of gold at considerably high temperture(200-300℃)and pressure(200-1000×10⁵Pa).