科研之友
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摘要
High cost on aeration is the major challenge in the biooxidation pretreatment of arsenic-bearing refractory gold ore. In present study, experiments at different pulp densities were carried out in different reactors. The variations of DO concentration, redox potential φ, pH and arsenic concentration were monitored during the biooxidation process. Firstly, experiments were carried out in a 5 L reactor at different pulp densities. The results show that the DO concentration at the 25% pulp density is significantly lower than that that at the 10% pulp density. In spite of the low DO concentration, the φ increases and the pH decreases continuously at the 25% pulp density, indicating that low DO concentration can still sustain the biological process. It is suggested that relative low aeration intensity can be used in the industrial plant for low cost on aeration. Secondly, experiments were carried out in an 80 L reactor at the 25% pulp density. The 80 L reactor has a higher ratio of H/D than that of the 5 L reactor and it is equipped with a draft-tube. It is found that the DO concentration in the 80 L reactor is obviously higher than that in the 5 L reactor though the ventilation ratio in the 80 L reactor is lower than that in the 5 L reactor. The results imply that the draft-tube and higher ratio of H/D are helpful for the increase of DO concentration in the 80 L reactor. It is suggested that optimizing design of the reactor can increase the DO concentration in the industrial plant without extra cost on aeration.
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单位中国科学院大学; 生化工程国家重点实验室
