基于热力学计算的湘钢高炉成渣分析与应用

Analysis and Application of Slag Formation in XISC Blast Furnace Based on Thermodynamic Calculation

高炉造渣制度是高炉的四大基本制度之一,炉渣的熔化性能和流动性能对高炉的稳产、顺行、低耗有着至关重要的作用。本文通过热力学计算,重点研究了湘钢炼铁厂含铁炉料脉石相熔化和高炉成渣机理。研究结果表明,由于烧结矿脉石相碱度较高,只能通过CaO-SiO_(2)-FeO体系产生液相。碱度较低的球团矿、块矿、初渣和终渣则可通过CaO-SiO_(2)-Al_(2)O_(3)-FeO体系和CaO-SiO_(2)-Al_(2)O_(3)-MgO体系产生液相,因此造成了初渣和终渣的固相线温度和液相线温度出现在三种炉料脉石相的固相线温度和液相线温度之间。研究结果应用在了湘钢高比例烧结矿、低镁铝比生产和炉况快速恢复中,取得了良好的经济效益。

Slagging system of the blast furnace is one of the important systems of the blast furnace.The melting and flowing properties of the slag play a vital role in the stable production,smooth operation and low consumption of the blast furnace.This article focuses on the study of the mechanism of slag formation and the melting of iron containing furnace materials in Iron-making Plant through thermodynamic calculations.The research results show that the liquid phase can only be produced through CaO-SiO_(2)-FeO system due to the high alkalinity of sinter vein phase.Pellet ore,lump ore,primary slag and final slag with low alkalinity can produce liquid phase through CaO-SiO_(2)-Al_(2)O_(3)-FeO system and CaO-SiO_(2)-Al_(2)O_(3)-MgO system,so the solidus temperature and liquidus temperature of the primary slag and final slag are between the solidus temperature and liquidus temperature of the three gangue phases.The research results have been applied to the production of high proportion sinter,low MgO/Al_(2)O_(3) ratio and rapid of furnace conditions in XISC and achieved good economic benefits.