| 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 were investigated. 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 than 2.5. 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 in 40 min under the optimized conditions, when the slurry concentration was 33%, oxygen pressure was 1.6 MPa, gas-liquid interfacial area was 25 m2/m3. |
