超临界水氧化法选冶难选金矿石的初步实验

介绍了超临界水氧化法(SCWO)选冶难选金矿石的初步实验，采用SCWO技术，在反应温度550oC、操作压力25 MPa及反应时间10 min时，使难选金矿石回收率从≤35%提高到92.8%.在超临界氧化反应过程中，有机物被氧化为CO2和水，S氧化为硫酸盐，沉积于渣中；虽然As被氧化生成As2O3，但由于几乎不溶于超临界流体，最终固定在渣中. 氧化反应后排放的超临界水清洁，符合国家《污水综合排放标准》，并且不排放有害气体，整个选冶过程符合清洁生产工艺要求.

Preliminary Exploration on Dressing and Smelting of Refractory Gold Ore by Supercritical Water Oxidation

The preliminary exploration on dressing and smelting of refractory gold ore by supercritical water oxidation(SCWO) was investigated. When oxidation reaction time is 10 min, temperature is 550oC and pressure is 25 MPa, the recovery rate of refractory gold ore can be from 35% or less to 92.8%, organic compounds can be oxidized to carbon dioxide and water, sulfur can be oxidized to sulfate and be sedimentated. Although arsenic is oxidized to arsenic trioxide, it dissolves hardly into supercritical fluid and is sedimentated too. Effluent water is clear, with a quality meeting the national integrated wastewater discharging standard. There is no pollutant in effluent air, it is promising for cleaner dressing and smelting of refractory gold ore.