电硅热法冶炼硅钙铁的机理讨论

MECHANISM STUDY ON SMELTING Si-Ca-Fe BY ELECTRO-SILICOTHBRMIC PROCESS

本文就电硅热法冶炼硅钙铁的主导反应，硅还原氧化钙的热力学，以及冶炼中的几个工艺参数进行了讨论。认为冶炼过程中的主导反应是２ＣａＯ＋Ｓｉ＝２Ｃａ＋ＳｉＯ２；炉渣组成位于２ＣａＯ·ＳｉＯ２－液二相区内，可以保证合适的冶炼温度和最大的氧化钙活度；电硅热法冶炼硅钙合金的产品含钙量难以超过３３％．

Abstract Through study on the dominant reaction in producing Si-Ca-Fe by electrosilicothermic process, the thermodynamics of silicon reducing CaO and several technological parameters, the author considers: the dominant reaction is 2Cao + Si = 2Ca + SiO_2; The composition of slag lies in 2CaO·Sio_2-liquid biphase zone, and that can assure proper smelting temperature and maximum activity of Cao; the product's calcium content in CaSi by electro-silicothermic process is little more than 33%.