Environmentally sound technologies for recycling secondary lead
Environmentally sound technologies for recycling secondary lead
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DOI：
10.1016/s0378-7753(99)00520-0
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发表时间：
2000-05-01
影响因子：
9.2
通讯作者：
Frias, C
中科院分区：
文献类型：
--
作者：
Andrews, D;Raychaudhuri, A;Frias, C
湿法冶金的进步为控制从精矿到回收铅的整个铅链提供了越来越简单的手段。与火法冶金同时使用，这些工艺可以将熔炉温度降至最低，这对于铸造或合金化至关重要。最大限度地减少了烟雾和大气污染，熔炉炉渣被消化，大多数残留物（除净化水泥外）是无毒的，可转化为可销售的产品。这些新工艺为回收电池中的铅提供了最清洁和最健康的可行方法。通过用熔化代替熔炼，每次装料的热量需求和循环时间减少了一半以上。一个新的湿法冶金厂可以在不受干扰的情况下与现有的火法冶金厂并排安装，使其在运行时的潜在能力增加一倍（如果使用电解冶金，则增加更多）。超过99.5%的铅原来存在的是回收在一个联合PLACID的热电厂的测试。电解法制取的铂酸铅平均纯度为99.995%。FLINT过程的结果应该相似。因此，铅链的纯度可以通过回收来维持。完美的固体/糊状物分离不是强制性的，并且FLINT型设备单元可以是任何尺寸。这些工艺为开发适合亚洲社会使用的清洁工艺奠定了良好的基础。(C)2000 Elsevier Science S.A. All rights reserved.
Advances in hydrometallurgy are providing increasingly simple means for controlling the entire lead chain from concentrate to recycled lead. Used in parallel with pyrometallurgy, these processes allow furnace temperatures to be reduced to the minimum, which is essential for casting or alloying. Fumes and atmospheric pollution are minimized, furnace slags are digested, and most residues (other than purification cements) are non-toxic and convertible into marketable products. These new processes provide the cleanest and healthiest practicable means for recycling lead from batteries. By substituting melting for smelting, the heat requirement and cycle time per charge are reduced by more than half. A new hydrometallurgical plant could be installed alongside an existing pyrometallurgical plant without interference, doubling its potential capacity when operational (and more, if electrowinning is used). Over 99.5% of the lead originally present is recovered in tests of a combined PLACID-pyro plant. The average purity of electrowon PLACID lead is 99.995%. Results from the FLINT process should be similar. The purity of the lead chain can thereby be sustained through recycling. Perfect solid/paste separation is not mandatory, and FLINT-type plant units can be of any size. Such processes constitute a good basis for development of clean processes, which are suitable for use in Asian societies. (C) 2000 Elsevier Science S.A. All rights reserved.