Ferroalloy basic purposes: ferro-alloys variety. By production methods Classification: blast ferroalloy electric furnace ferroalloy, calcium aluminosilicate Henan new alloy, furnace extrajudicial (metal calorimetry) ferroalloy, calcium aluminosilicate new alloy, vacuum solid state reduction ferroalloy, calcium aluminosilicate electrolysis ferroalloy new alloy prices, in addition to an oxide alloy compacts with fever and other special alloy. Ferroalloy industry has experienced three periods: From ferroalloy smelting methods, the scale of development and technical equipment and other aspects of research, world ferroalloy industrial development can be divided into three development period. Blast furnace smelting period. 1860 and 1908 accounted for the blast furnace production development period of absolute advantage. Had mainly to meet the steel deoxidation and alloying of a small amount of demand, the number of small, quality is not high, the main varieties of high-carbon ferromanganese alloy, high-carbon ferrochrome and low-grade ferrosilicon, blast furnace iron alloy technology has been able to meet iron and steel production.