Electric arc furnace filter dust: Influence of organic material on the bulk density and flowability

Abstract

ABSTRACTIn this study, the influence of condensed organic matter on the flowability and the bulk density of electric arc furnace (EAF) dust was investigated. The properties of the original dust samples containing some organic matter were compared with the properties of these samples after the removal of the condensed organic compounds by a deoiling procedure. The particle size distribution and the density of the three investigated dust samples were quite similar but the content of organic matter (TOC) was different. The values for the bulk density were lower for the original dust compared to the deoiled dust samples. The higher the TOC content, the higher the difference in the bulk density. Thus, the storage capacity of the dust silo was reduced by 9–17%. The flowability of all deoiled dust samples was very similar, whereas the flowability of the original dust was worse. The higher the TOC content, the worse the flowability. The average reduction of ffc in comparison to the deoiled dust samples was 48, 38, and 17% for EAF dust samples with 0.65, 0.46, and 0.26% TOC, respectively. Evidently, the condensed organic matter on the dust particles reduces the flowability of the material. Therefore, the bulk density for dust with a higher TOC content is also lower.