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首页> 外文期刊>Journal of Cleaner Production >Recycling of basic oxygen furnace steelmaking dust by in-process separation of zinc from the dust
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Recycling of basic oxygen furnace steelmaking dust by in-process separation of zinc from the dust

机译：通过从粉尘中进行锌的分离回收碱性氧气炉炼钢粉尘

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High zinc content in solid wastes from basic oxygen furnace steelmaking offgas cleaning systems is one of the main barriers for source recycling of the solid wastes back into ironmaking and steelmaking process. Over-limit zinc loadings to blast furnaces might damage blast furnace refractory materials, and hence shorten blast furnace campaign life. In addition, high zinc input into blast furnaces might also cause operation difficulties of the blast furnaces, and thus decrease blast furnace productivities. Therefore, how to separate zinc from the solid wastes in an economic way becomes a crucial step for recycling of the solid wastes in sintering blast furnace ironmaking process. There are three general strategies of separating zinc from the solid wastes, which are referred to as before-process separation, post-process separation and in-process separation. In-process separation is to separate zinc from the solid wastes in the process while the solid wastes are being collected. In this research paper, industrial trials are reported on measuring zinc distributions in dry offgas cleaning systems of two ArcelorMittal basic oxygen furnace steelmaking plants. The results show that primary dusts contain negligible zinc and have good qualities comparable with virgin iron ores. Therefore, in-process separation strategy has a potential to be applied in existing basic oxygen furnace steelmaking offgas cleaning systems to make cleaner offgas byproducts without revamping the offgas cleaning systems. However, in order to recycle more of the solid wastes with low level of zinc, it will be needed to install high-efficiency primary dust collectors and more advanced offgas pre-conditioning mechanisms prior to the primary dust collectors. (C) 2015 Elsevier Ltd. All rights reserved.
机译：来自碱性氧气炉炼钢废气净化系统的固体废物中高锌含量是将固体废物源循环回炼铁和炼钢过程的主要障碍之一。高炉中锌含量超标可能会损坏高炉耐火材料，从而缩短高炉使用寿命。另外，高锌输入到高炉中也可能引起高炉的操作困难，从而降低高炉生产率。因此，如何以经济的方式从固体废物中分离锌成为烧结高炉炼铁过程中固体废物循环利用的关键步骤。从固体废物中分离锌的一般策略有三种，分别称为工艺前分离，工艺后分离和工艺中分离。过程中分离是在收集固体废物的过程中将锌与固体废物分离。在这篇研究论文中，据报道进行了工业试验，以测量两家ArcelorMittal基础氧气炉炼钢厂的干法废气净化系统中的锌分布。结果表明，初级粉尘中锌含量可以忽略不计，并且具有与原始铁矿石相当的质量。因此，过程中分离策略有可能在现有的基本氧气炉炼钢废气净化系统中应用，以在不改造废气净化系统的情况下制造出更清洁的废气副产物。但是，为了回收更多的锌含量低的固体废物，将需要在该初级除尘器之前安装高效的初级除尘器和更先进的废气预处理装置。 （C）2015 Elsevier Ltd.保留所有权利。

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