微细浸染型金矿酸性热压氧化预处理动力学研究

Study on the Kinetics of Pretreatment for Micro-disseminated Sulfide Gold Ores by Acidic Autoclave Oxidation

以氧气消耗速率表征氧化速率,研究了微细浸染型硫化物金矿热压氧化预处理过程动力学的影响因素,考察了矿浆pH值、温度、矿样粒度、氧分压、气液界面面积和矿浆浓度对氧化速率的影响,以及氧化率和氧化速率的关系。结果表明,矿浆pH<2.5时,保持较高的氧化速率;氧化速率随温度升高、氧分压增加和矿浆浓度降低而增大;增加气液接触面积可提高氧化速率,当矿浆浓度为33%、氧分压1.6 MPa,在优化条件下,气液接触比表面积达到25 m2/m3,40 min可完成氧化预处理。

The reaction of oxidation pretreatment was characterized by the oxygen consumption rate.The influencing factors on dynamics of autoclave oxidation pretreatment were studied in the micro-disseminated sulfide gold ore.The impacts on the oxidation rate by the initial pH of slurry,temperature,particle size,oxygen pressure,gas-liquid interfacial area,slurry concentration wereinvestigated.The relationship between the degree and reaction rate of oxidation was also explored.The results showed that a high reaction rate of oxidation would be maintained when the pH of the slurry was less than2.5.The oxidation would accelerate,as the temperature and oxygen pressure was increased while the slurry concentration was reduced.The reaction rate of oxidation could also be improved by rising gas-liquid interfacial area.The oxidation pretreatment could be finished in40min under the optimized conditions,when the slurry concentration was33%,oxygen pressure was1.6MPa,gas-liquid interfacial area was25m2/m3.