Speciation of Iron, Zinc, Lead and Calcium in blast furnace top-gas filter dust by sequential leaching

METAL 2021 Conference Proeedings Pub Date : 1900-01-01 DOI:10.37904/metal.2021.4072

C. Lanzerstorfer

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Abstract

Top-gas dedusting at blast furnaces (BF) is usually done with venturi scrubbers. However, in recent years, the total dry dedusting of BF top-gas has become a common technology. In this case, a fabric filter is used instead of the venturi scrubber. For recycling, the dry dust from a fabric filter is preferable to the sludge from a scrubber. The main constituents of BF dedusting residues, Fe, C and Ca are of some value, while tramp elements, particularly Zn, can cause problems in the process. Results from leaching of the sludge obtained in wet BF dedusting are available. In contrast, data from leaching of dry filter dust from BF dedusting are not available. However, it has to be assumed that the behavior of a dust from dry dedusting deviates somewhat from that of a sludge due to the prolonged residence time of the sludge in the scrubber system under varying pH. In this study the filter dust of a BF top-gas dry dedusting filter was investigated, applying sequential leaching and X-ray diffraction analysis for the investigation of the distribution of Fe, Ca, Zn and Pb in various compounds with a focus on the tramp element Zn.

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高炉煤气过滤尘中铁、锌、铅、钙的顺序浸出形态

高炉顶气除尘通常采用文丘里洗涤器。但近年来，高炉煤气全干除尘已成为一种常用技术。在这种情况下，使用织物过滤器代替文丘里洗涤器。对于再循环，织物过滤器中的干粉尘比洗涤器中的污泥更可取。高炉除尘渣的主要成分铁、碳、钙具有一定的价值，而次要元素，尤其是锌，则会在处理过程中产生问题。从湿式高炉除尘中获得的污泥的浸出结果是可用的。相比之下，从高炉除尘中浸出干滤尘的数据是不可用的。然而,必须假定尘埃从干式除尘的行为一定程度上偏离了污泥由于长时间的停留时间的洗涤器系统的污泥在不同博士在这项研究中过滤灰尘的高炉炉顶煤气干式除尘过滤器进行了研究,应用连续浸出和x射线衍射分析的分布调查的铁、钙、锌和铅在不同化合物重点是流浪汉元素锌。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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METAL 2021 Conference Proeedings

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