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首页> 外文会议>National Seminar on "Application of Chemical Engineering for Utilisation of Natural Resources (CHEMINAR-2001)", Feb 16-18, 2001, Bhubaneswar >Biohydrometallurgy of Polymetallic Concentrate in Pilot Level Bioreactor
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Biohydrometallurgy of Polymetallic Concentrate in Pilot Level Bioreactor

机译：中试生物反应器中多金属精矿的生物湿法冶金

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The pilot level reactor bioleaching process was developed with a working volume of 100-150 dm~3 in 200 dm~3 capacity vessel for GMDC polymetallic concentrate. The metals were extracted using consortium consisting of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxi'dans developed in our laboratory. The process was carried out in batch and fed batch process using 10 and 20% (w/v) pulp density. The batch process with 10% (w/v) pulp density resulted in 60.3 and 70% copper and zinc extraction respectively in 7 days of residence time. During the process pH fluctuation was from 1.98 to 2.16. The acid consumption to maintain desired pH was 8.26 g sulphuric acid per kg of concentrate. When the process was run with 20% (w/v) pulp density both copper and zinc extraction decreased below 56% even after 10 days of contact time. The mode of pulp addition showed significant beneficial influence on metal extraction. In the fed batch pilot scale study with 8 days of residence time acid consumption reduced to 2.9 g sulphuric acid per kg concentrate. Even after 17 successful transfer average metal extraction of 80 and 85% was observed for copper and zinc respectively. In fed batch process the metal extraction rate was enhanced by 1.8 and 2.5 times for copper and zinc respectively as compared to batch process. With high pulp density the fed batch process was found to be the method of choice compared to the batch process.
机译：在200 dm〜3容量的容器中开发了用于GMDC多金属精矿的中试反应器生物浸出工艺，工作量为100-150 dm〜3。使用我们实验室开发的由铁氧化硫杆菌，硫氧化硫杆菌和铁螺旋体组成的财团提取金属。该过程使用10和20％（w / v）的纸浆密度分批进行，并分批进料。纸浆密度为10％（w / v）的分批处理在7天的停留时间内分别提取了60.3％和70％的铜和锌。在此过程中，pH波动范围为1.98至2.16。维持所需pH所需的酸消耗量为每千克浓缩液8.26克硫酸。当以20％（w / v）的纸浆密度运行该工艺时，即使经过10天的接触时间，铜和锌的萃取率也都降至56％以下。纸浆添加方式对金属提取显示出显着的有益影响。在分批进料的中试规模研究中，停留时间为8天，每公斤精矿中的硫酸消耗量减少到2.9克硫酸。即使经过17次成功的转移，铜和锌的平均金属提取率也分别达到80％和85％。与分批工艺相比，在分批进料工艺中，铜和锌的金属提取率分别提高了1.8倍和2.5倍。纸浆密度高时，与分批工艺相比，发现补料分批工艺是首选方法。

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