Stainless steel slags and the use of ChemApp - RWTH Aachen ...

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The EAF process Slag issues during EAF refining Early liquid slag formation prevent over-oxidation of Cr Slag foaming increase furnace productivity, refractory lifetime, energy and material efficiency Chromium recovery economical & environmental reasons Immobilisation of CrO x enhance slag valorisation potential All affected by high-T slag microstructure
Two distinct 120t EAFs Furnace types EAF1 = Eccentric Bottom Tapping Furnace No C/O 2 lance no foaming EAF2 = Spout Tapping Furnace C/O 2 lance slag foaming EAF1 (EBTF) EAF2 (STF)
Page 1 and 2: Stainless steel slags and the use o
Page 3: Katholieke Universiteit Leuven
Page 8 and 9: I. Pyrometallurgical processing Ve
Page 10 and 11: II. Phase relations in materials sy
Page 12 and 13: Stainless steel slags
Page 14 and 15: Steel production sites in Belgium
Page 16 and 17: Assumptions: density = 2.5 ton/m³,
Page 18 and 19: Stainless steel production 3-step
Page 20 and 21: Process Modelling: Chromium recover
Page 24 and 25: EAF operations
Page 26 and 27: Temperature evolution
Page 28 and 29: Slag composition
Page 30 and 31: Slag Sampling Schematic diagram of
Page 32 and 33: Results - Final CrO x values (tappi
Page 34 and 35: Results - Evolution slag microstruc
Page 36 and 37: Slag microstructure - spinel partic
Page 38 and 39: Results: liquidus Tests in differe
Page 40 and 41: Other examples of process modelling
Page 42 and 43: Dumping Valorisation
Page 44 and 45: Slow slag solidification 24 h
Page 46 and 47: Slag valorisation chain Required sl
Page 48 and 49: EAF = Al 2 O 3 containing Slag comp
Page 50 and 51: Slag disintegration FS/CC slag aft
Page 52 and 53: Cause of slag disintegration Prese
Page 54 and 55: Laboratory experiment Slag composit
Page 56 and 57: Assumptions Thermodynamic equilibri
Page 58 and 59: Mineralogy Experiment Equilibrium S
Page 60 and 61: Air-cooled solidification pO 2 ind
Page 62 and 63: Microstructural calculations CaO-S

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