Lowering iron losses during slag removal in hot metal desulphurisation without using fluoride
| Autor: | Jilt Sietsma, Fuzhong Ji, Rhian Woolf, Yongxiang Yang, Rob Boom, Peter Warren, Elisabeth M. Beunder, Frank N. H. Schrama, Adam Hunt, Alison Tuling |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
hot metal desulphurisation 0211 other engineering and technologies geology 02 engineering and technology nepheline syenite 01 natural sciences Metal chemistry.chemical_compound 0103 physical sciences Materials Chemistry 021102 mining & metallurgy 010302 applied physics fluoride Mechanical Engineering Metallurgy geology.rock_type Metals and Alloys Slag Apparent viscosity fly ash Slag modifier chemistry Mechanics of Materials Fly ash visual_art visual_art.visual_art_medium Nepheline syenite Fluoride |
| Zdroj: | Ironmaking & Steelmaking: processes, products and applications, 47(5) |
| ISSN: | 1743-2812 0301-9233 |
| DOI: | 10.1080/03019233.2020.1747778 |
| Popis: | To lower the iron losses of the hot metal desulphurisation (HMD) process, slag modifiers can be added to the slag. Slag modifiers decrease the apparent viscosity of the HMD slag. Most common slag modifiers in industry contain fluoride as a fluidiser. However, fluoride leads to a higher magnesium consumption and has health, safety and environment issues. Fluoride-free alternatives like nepheline syenite (NS) and fly ash (or pulverised fuel ash, PFA) can decrease the slag’s apparent viscosity. Experiments with HMD slags containing CaF2, NS and PFA and without slag modifier were performed for slags with a high and an average basicity. The melting points of the slags and their viscosities 1250–1600°C were measured. The experimental results are compared with FactSage calculations. PFA and NS are viable alternatives in the industrial HMD process, as reasonable amounts are sufficient to reach the same lower apparent viscosities and melting points as with CaF2. |
| Databáze: | OpenAIRE |
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