摘要：

某矿山属于含砷难处理金矿，需要采用高压预氧化或生物预氧化工艺对矿石进行预处理后，才能实现金的高效回收。矿山现场水质盐度高，Cl^-浓度高，需对其淡化处理后才能用于矿石的氧化处理工艺中。膜技术应用于水处理领域，相比传统技术具有处理效率高、成本低的优势；通过对现场水质的综合分析和针对性的系列试验，结果表明，不用化学预处理除钙镁，膜技术可以直接实现矿区盐水的有效脱盐，满足提金的生产需求。盐水采用电渗析处理后，产水Cl^-质量浓度可控制在1.5 g/L，满足生物预氧化对水质的要求，淡水回收率为60%，吨水能耗约为6.5~7.0 kW·h。电渗析与反渗透组合工艺可以实现深度脱盐，脱盐后盐水的Cl^-质量浓度可控制在100 mg/L以内，满足加压浸出用水要求，综合产水率为54.5%，吨水能耗约8.5~10.0 kW·h，经济和技术可行。

关键词: 盐水, 膜处理, 能耗

Abstract:

A mine is an arsenic-containing hard-to-treat gold mine, which needs to be pretreated by high-pressure pre-oxidation or biological pre-oxidation technology to achieve high recovery of gold. The water at the mine site has high salinity and high chlorine ion content. It needs to be desalted before being used in the oxidation treatment process of ore. Membrane technology is used in the field of water treatment compared with traditional technology, which has the advantages of high treatment efficiency and low cost. Through comprehensive analysis of on-site water quality and targeted series of tests, the results showed that without chemical pretreatment to remove calcium and magnesium, membrane technology could directly realize the effective desalination of salt water in mining areas and meet the production needs of gold. After electrodialysis treatment of salt water, the concentration of chlorine ions in water could be controlled at 1.5 g/L, which met the requirements of biological pre-oxidation for water quality. The water recovery rate was 60%, and the energy consumption was about 6.5-7.0 kW·h. The combination process of electrodialysis and reverse osmosis could achieve deep desalination. The concentration of chlorine ions in brine after desalination could be controlled within 100 mg/L, which met the requirements of high-pressure pre-oxidation process. The comprehensive water recovery was 54.5%,and the energy consumption was about 8.5-10.0 kW·h, which was economically and technically feasible.

Key words: salt water, membrane treatment, consumption

中图分类号: 

• TQ028.8