Adsorption of oils, heavy metals and dyes by recovered carbon powder from spent pot liner of aluminum smelter plant.
Adsorption of oils, heavy metals and dyes by recovered carbon powder from spent pot liner of aluminum smelter plant.
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发表时间：
2008-07
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通讯作者：
B. Mazumder;S. R. Devi
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作者：
B. Mazumder;S. R. Devi
铝冶炼厂采用Hall-Heroult电解槽对熔融冰晶石进行电解，通过电解回收铝金属。这些电池内部使用碳阴极块作为衬里材料。在电池使用寿命结束时，罐线被丢弃，新的碳块被铺设以进行新的充电。这些用过的碳阴极块，被称为废罐衬里，被氟化物、氰化物、碱等有毒元素严重污染。因此，露天处置具有很大的环境风险。开发了一种简单的方法来净化这些废罐衬垫并回收其碳值。实验表明，这种碳以细粉末的形式（尺寸在20微米左右）可以在很大程度上吸收重金属、染料、油脂等有毒元素，从而可以用于减轻各种有毒废物对环境的污染。
Aluminum smelter plants employ Hall-Heroult electrolysis cells for electrolysis of molten cryolite to recover aluminum metal by electrolysis. These cells use carbon cathode blocks as a lining material inside. At the end of service life of the cells, pot lines are discarded and new carbon blocks are laid for fresh charging. These used carbon cathode blocks, known as spent pot liners, are heavily infested with toxic elements such as fluoride, cyanide, alkali, etc. Therefore, their disposal in open field poses great environmental risk. A simple process has been developed for decontamination of these spent pot liners and to recover its carbon value. The experiments indicated that this carbon, in the form of fine powder (around 20 micron in size) can absorb toxic elements like heavy metals, dyes, oils, etc. to a great extent and thus can be used for mitigating environmental pollution occuring due to various toxic wastes.