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Briquetting of Fine‐Grained Residues from Iron and Steel Production Using Organic and Inorganic Binders
Steel Research International ( IF 2.2 ) Pub Date : 2020-07-07 , DOI: 10.1002/srin.202000238
Laura Lohmeier 1 , Christoph Thaler 2 , Christopher Harris 2 , Ralf Wollenberg 1 , Hans-Werner Schröder 1
Affiliation  

The Midrex process produces metallurgical residues in the form of dust, sludge, and fines. As these have high iron content, herein, the aim is to recycle the residues and use them as an educt in the Midrex process, thus closing the material cycle and increasing raw material efficiency. Briquetting of these materials with binder is one possibility to prepare them for the use as an educt in the Midrex process. Experiments are conducted to test the suitability of the organic binders starch and cellulose for briquetting. Furthermore, tests with the inorganic bentonite are included for comparison. Briquettes are generally characterized by high strength. However, compared with iron oxide pellets, they have a low porosity and thus a higher apparent density, and consequently, a worse reducibility. The use of organic binders should improve the reducibility. The iron oxides are in close contact with the C‐carrier of the organic binder so that a solid–solid phase direct reduction can take place. Furthermore, the solid carbon reacts to CO, and thus, increases the presence of reducing gas in the enlarged pores of the briquettes, and should therefore increase the degree of reduction.

中文翻译:

使用有机和无机粘合剂将钢铁生产中的细颗粒压块

Midrex工艺会产生粉尘,污泥和细粉形式的冶金残留物。由于这些铁具有较高的铁含量,因此本文的目的是回收残留物并将其用作Midrex工艺中的离析物,从而结束物料循环并提高原材料效率。用粘合剂将这些材料团块化是一种准备将其用作Midrex工艺中的离析物的可能性。进行实验以测试有机粘合剂淀粉和纤维素对团块的适用性。此外,还包括使用无机膨润土进行的测试,以进行比较。型煤通常以高强度为特征。但是,与氧化铁颗粒相比,它们的孔隙率低,因此表观密度较高,因此还原性较差。有机粘合剂的使用应提高可还原性。氧化铁与有机粘合剂的C-载体紧密接触,因此可以进行固-固相直接还原。此外,固体碳与CO反应,因此,在团块的扩大的孔中增加了还原性气体的存在,因此应提高还原度。
更新日期:2020-07-07
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