CR炉用镁铬质耐火材料的侵蚀机理分析

Analysis of corrosion mechanism of magnesia-chromite refractory material used in CR furnace

由于CR炉相较于传统火法冶炼炉有较大的工艺区别,关于其镁铬砖侵蚀机理的研究文献较少。本文以扩大实验用CR炉耐火砖残砖为研究对象,采用化学分析、物理性质检验、电子探针等手段进行侵蚀过程分析研究,探究炉渣对镁铬耐火砖的侵蚀机理,得到如下结论:炉壁砖的损坏程度高于炉底砖;炉壁砖以渣的侵蚀渗透为主,MgO首先溶解到渣中,而侵入耐火材料的渣在耐火材料中形成硅酸盐化合物、镁铁橄榄石、铁酸镁和硅酸镁等,渗透进入的铜锍不与耐火材料反应;炉底砖以铜锍以及金属单质Cu、Fe、Pb的渗透为主。

Since Cr furnace differs greatly from traditional pyrometallurgical furnaces in process,few research literature can be found about the corrosion mechanism of magnesia-chromite bricks.This paper studies residual refractory bricks of Cr furnace used in the scale-up test,and adopts such methods as chemical analysis,physical property test and electron microprobe to analyze the corrosion process and probe into the corrosion mechanism of magnesiachromite refractory bricks by slag.The following conclusions are drawn.Furnace wall bricks suffer more damage than furnace bottom bricks.Damage to furnace wall bricks is mainly caused by corrosion and penetration of slag.MgO first dissolves in slag and slag reacts to generate silicate,hortonolite,magnesium ferrite and magnesium silicate in refractory materials.Copper matte does not react with refractory materials.By contrast,damage to furnace bottom bricks is mainly caused by penetration of copper matte and metal elements such as Cu,Fe and Pb.