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首页> 外文期刊>Metallurgist >Recycling of Electrolyzer Spent Carbon-Graphite Lining with Aluminum Fluoride Regeneration
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Recycling of Electrolyzer Spent Carbon-Graphite Lining with Aluminum Fluoride Regeneration

机译：氟化铝再生回收电解废碳石墨衬里

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摘要

The spent lining of aluminum electrolyzer is one of the most environmentally hazardous wastes of the aluminum industry due to its content of up to 0.2 wt.% cyanide and up to 40 wt.% fluorides. The majority of spent lining is accumulated near aluminum plants in specially equipped landfills, where it can interact with water and air, with formation of toxic compounds and alkaline solutions that could lead to ground water contamination. At the same time, spent lining is of specific value due to presence of fluoride and up to 30 wt.% carbon. Known technology for processing spent lining with preparation of cryolite in operation at some aluminum plants has lost its importance after introduction of dry gas cleaning and a change-over to electrolysis technology using acidic electrolytes. This has led to a substantial reduction of cryolite requirement. Therefore, at present more attention is devoted to technology for producing aluminium fluoride, including from spent lining. This article provides a brief review of known technology for processing aluminum electrolyzer spent lining. Technology is provided for preparing aluminium fluoride product containing fluorine of 55-59 wt.%; thus, there is a reduction in fresh AlF3 consumption of about 4-6 kg/ton Al. Laboratory test results are provided.
机译：铝电解槽的废衬板是铝工业中对环境危害最大的废物之一，因为其含量高达0.2 wt。％的氰化物和高达40 wt。％的氟化物。大部分用过的衬里都聚集在经过特殊装备的垃圾填埋场的铝厂附近，在那里它可以与水和空气相互作用，形成有毒化合物和碱性溶液，可能导致地下水污染。同时，由于存在氟化物和高达30 wt。％的碳，废衬具有特定的价值。在引入干气净化和使用酸性电解质的电解技术转换之后，在一些铝厂中运行的处理冰晶石和制备冰晶石的已知技术已失去其重要性。这导致冰晶石需求量大大降低。因此，目前将更多的注意力投向包括从废衬里生产氟化铝的技术。本文简要介绍了用于处理铝电解废料衬里的已知技术。提供了一种制备氟含量为55-59wt。％的氟化铝产品的技术;因此，新鲜AlF3的消耗量减少了约4-6 kg /吨Al。提供了实验室测试结果。

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