铜冶炼侧吹炉用镁铬质耐火材料损毁机制
Damage mechanism of magnesia-chrome refractories for side-blown copper smelting furnace
付琪琪 1钟立桦 2白文献 1淦永彤 1邓俊杰1
作者信息
- 1. 中钢洛耐科技股份有限公司 河南洛阳 471000
- 2. 赤峰金通铜业有限公司 内蒙古赤峰 024000
- 折叠
摘要
为了保证新工艺下侧吹炉的安全稳定运行,采用扫描电子显微镜、能谱仪分析了铜冶炼侧吹炉渣线部位侧墙镁铬砖的侵蚀损毁机制.结果表明:1)位于渣线处的镁铬砖由于受到铜锍、熔渣的交替冲刷、渗透作用,难以形成稳定的挂渣层,造成镁铬砖渗透-侵蚀-剥落的持续循环,导致该处的镁铬砖蚀损最为严重;而渣线上部镁铬砖的蚀损程度较小,原因是铜锍在渣线上部镁铬砖中的渗透作用明显减弱,镁铬砖热面形成稳定的尖晶石及橄榄石相致密层,可以一定程度上阻挡熔渣和铜锍的进一步渗透及侵蚀.2)铜锍虽然在镁铬砖中仅沿气孔和晶界渗透,并不参与侵蚀反应,但其渗透后包裹于基质颗粒或晶粒周围,破坏了镁铬砖的直接结合,破坏原镁铬砖的稳定结构,降低镁铬砖对熔渣及铜锍的抗侵蚀性.3)铜锍主要沿铬铁矿颗粒周围以及析出富铁尖晶石的方镁石晶间渗透,不利于镁铬砖抵抗SiO2-FeO熔渣的渗透与侵蚀.
Abstract
In order to ensure the safe and stable operation of the side-blown furnace adopting new process,the corrosion damage mechanism of the magnesia-chrome brick of the side wall at the slag line in a side-blown copper smelting furnace was researched using a scanning electron microscope and an energy dis-persive spectrometer.The results show that:(1)the magnesia-chrome bricks located at the slag line un-dergo alternating corrosion and infiltration of copper matte and slag,which is hardly to form a stable slag layer,resulting in a continuous cycle of infiltration-corrosion-spalling of magnesia-chrome bricks and the severest corrosion;the corrosion of the magnesia-chrome bricks above the slag line is slight,because the infiltration of copper matte in the bricks is obviously weaken,and a stable spinel and olivine dense layer is formed on the hot surface of the bricks,serving as a barrier against further penetration and corrosion of slag and copper matte to a certain extent;(2)although copper matte only penetrates along the pores and grain boundaries in magnesia-chrome bricks without participating in the corrosion reaction,it penetrates and wraps the matrix particles or grains,disrupting the direct bonding of magnesia-chrome bricks,destro-ying the stable structure of the original magnesia-chrome bricks and consequently reducing their resist-ance to slag and copper matte;(3)the copper matte primarily penetrates along the chromite particles,and gaps between periclase crystals after the precipitation of iron-rich spinel,which is disadvantageous for the resistance of magnesia-chrome bricks to the penetration and corrosion of SiO2-FeO slag.
关键词
铜冶炼/侧吹炉/镁铬砖/侵蚀/渗透/损毁机制Key words
copper smelting/side-blown furnace/magnesia-chrome brick/corrosion/infiltration/damage mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据