Bioreactor performance versus solids concentration in coal biodepyritization
Bioreactor performance versus solids concentration in coal biodepyritization
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DOI：
10.1016/0378-3820(94)90147-3
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发表时间：
1994-11
影响因子：
7.5
通讯作者：
G. Loi;A. Mura;P. Trois;G. Rossi
中科院分区：
文献类型：
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作者：
G. Loi;A. Mura;P. Trois;G. Rossi
固体浓度是生物湿法冶金工艺中的一个关键技术经济参数，因为它决定着生物反应器的规模，从而影响投资和运行成本。自生物湿法冶金的早期以来，研究人员多次提供证据表明，当固体浓度的百分比超过16-20时，生物反应器中金属硫化物精矿的浸出率会急剧下降。如果这一限制也适用于煤炭生物脱黄铁矿过程，将严重制约它们的经济。本文介绍了在托雷斯港煤生物脱黄铁矿中试装置的7.5m~3搅拌槽式反应器(STR)中，三种不同类型的实验室反应器平行运行的结果。结果表明，在固体浓度为5%~40%的范围内，反应器的生物脱黄铁矿性能基本保持不变，而在相同的反应器中，当固体浓度为30%时，纯黄铁矿的生物浸出失败。这一结果似乎支持了固体浓度对细菌浸出性能的影响与固相中可氧化矿物的比例有关的观点。实验室规模和半商业规模的STR的比较似乎表明，扩大规模可以改善机器的性能。
Solids concentration is a critical technico-economic parameter in biohydrometallurgical processing since it decisively affects bioreactor size and therefore investment and operating costs. Researchers have repeatedly provided evidence, since the early times of biohydrometallurgy, that bioreactor leaching rates of metal sulphide concentrates drastically decrease whenever percent solids concentration exceeds 16–20. This limitation, should it hold also for coal biodepyritization processes, would place a serious constraint on their economics. The paper presents the results of an investigation carried out running in parallel three different types of laboratory reactors fed with the same pulp processed in the 7.5 m3stirred-tank reactors (STRs) installed in the Porto Torres coal biodepyritization pilot plant. Evidence is provided that biodepyritization performance of the reactors remains practically unchanged in the solids concentration range from 5% to 40%, whereas failure of pure pyrite bioleaching at 30% solids concentration is observed in the same reactors. This result seems to support the view that solids concentration influence on bioleaching performance is related to the proportion of oxidizable mineral present in the solid phase. Comparison of laboratory- and semi-commercial-scale STRs seems to show that scale-up imparts an improvement in machine performance.