21. The fates of different elements present in ferrous scrap which is melted in an electric arc furnace . 22. Producing raw steel from an electric-arc furnace at the Coatesville plant produced 70 % of their slabs. 23. The East Plant continues to operate at reduced capacity, processing electric arc furnace dust into zinc calcine. 24. He was the inventor of the aluminium electrolysis and developed the first successful commercial electric arc furnace . 25. Their factory was one of the first Italian companies to use the electric arc furnaces for steelmaking. 26. Ferroalloys are produced generally by two methods : in a blast furnace or in an electric arc furnace . 27. The invention of the electric arc furnace probably began when Humphry Davy discovered the carbon arc in 1800. 28. The bone-ash process became obsolete when the submerged-arc furnace for phosphorus production was introduced to reduce phosphate rock. 29. Virtually all mini-mills employ electric arc furnaces , and mini mills are the fastest-growing part of the steel industry. 30. Calcium carbide production requires extremely high temperatures, ~ 2000 �C, necessitating the use of an electric arc furnace .
