PEC EPE Metallurgical case studies
PEC EPE Metallurgical · Put your knowledge to work in context.
The PEC EPE Metallurgical is the Metallurgical Engineering component of the Engineering Practice Examination (EPE) administered by the Pakistan Engineering Council (PEC) for engineers seeking professional registration. It is a multiple-choice, computer-based test that samples the breadth of metallurgical engineering: extractive metallurgy (pyro-, hydro- and electrometallurgy), physical metallurgy and phase transformations, process thermodynamics and kinetics, ironmaking and steelmaking, materials science and mechanical testing, mineral processing, corrosion and failure analysis, foundry and joining, engineering ethics and safety, and engineering economics and quality control. The PEC EPE Metallurgical case studies are 5 cases and about 3,554 words.
1Converter slopping during a low-carbon blow
A 250 t top-blown converter is midway through a low-carbon heat with a 0.05% C target. The charge is 78% hot metal (4.2% C, 0.35% Mn, 0.06% P) and 22% scrap.
716 words, about 4 min2Zinc neutral-leach iron carry-over and goethite residue loss
A zinc plant leaches 200 t/day of calcine assaying 50% Zn, 9% Fe, 0.4% Cu and 0.8% Pb. Neutral leach operates at pH 5.0–5.2 and 70 C with 2 h residence time.
749 words, about 4 min3Hardness in a duplex-to-carbon-steel dissimilar weld
A fabricator is joining a 12 mm thick 2205 duplex stainless steel nozzle to a 25 mm thick ASTM A516 Grade 70 carbon steel shell. The procedure uses 2209 duplex filler, 50 C preheat, 150 C maximum interpass, and 0.8 kJ/mm heat input.
745 words, about 4 min4Under-deposit corrosion in a 316L cooling-water exchanger
A 316L stainless steel shell-and-tube cooler has leaked after 14 months at a tube-to-tubesheet roll joint. The cooling water contains 900 mg/L chloride, enters at 30 C and leaves at 55 C; the tube wall on the hot side reaches 85 C.
676 words, about 3 min5Copper flotation grade-recovery trade-off with talc penalty
A copper flotation plant treats 12,000 t/day of ore assaying 0.85% Cu, mainly chalcopyrite, with 3.5% pyrite and 18% talc. The circuit is rougher-scavenger-cleaner, grinding to P80 90 µm, rougher pH 10.5, cleaner pH 11.8, sodium isopropyl xanthate at 25 g/t, and MIBC at 15 g/t.
668 words, about 3 min