BOF 炉衬损坏原因分析 Analysis of the damage cause of the furnace lining
炉衬损坏原因分析
1 ， 加废钢和兑铁水时对炉衬的冲刷，和机械磨损
2 ， 钢液和炉渣的搅动以及炉气的冲刷
3 ， 炉渣对炉衬的化学侵蚀
转炉炉衬要交替经受化学侵蚀的两个阶段：
1 ， 前期酸性熔渣的侵蚀阶段，该阶段主要是sio2的侵蚀，低熔点硅酸盐入侵后向耐火材料内部迁移，破坏基质，形成脱碳层：
3mgo + cao + sio2 – > 3CaO.MgO.2SiO2 ( 1575’C )
MgO+CaO+SiO2 – > CaO.MGO.SIO2 (1495’C )
MGO+2CaO+SIO2 -> 2CAO.MGO.SIO2(1458’C)
MGO+CAO+2SIO2 – > CAO.MGO.2SIO2(1391’C)
氧化铁随后入侵，碳素骨架被破坏，耐材层冲刷掉。
FEO+C – > CO + FE
末期碱性熔渣的侵蚀阶段，在高温下氧化铁的侵蚀作用，FEO与CAO反应形成低熔点的铁酸盐，使耐材收到严重侵蚀。
Analysis of the damage cause of the furnace lining
1, add scrap steel and molten iron on the furnace lining erosion, and mechanical wear
- agitation of steel liquid and slag and erosion of furnace gas
- Chemical erosion of the slag on the furnace lining
The converter furnace lining is alternately subjected to two stages of chemical erosion:
- The erosion stage of acid slag in the early stage is mainly the erosion of sio 2. After invading the low melting point silicate, it moves into the refractory material, destroying the matrix and forming a decarbonization layer:
3mgo + cao + sio2 – > 3CaO.MgO.2SiO2 ( 1575’C )
MgO+CaO+SiO2 – > CaO.MGO.SIO2 (1495’C )
MGO+2CaO+SIO2 -> 2CAO.MGO.SIO2(1458’C)
MGO+CAO+2SIO2 – > CAO.MGO.2SIO2(1391’C)
The iron oxide then invades, the carbon skeleton is destroyed, and the refractory layer is washed away.
FEO+C – > CO + FE
In the erosion stage of alkaline slag, the erosion of iron oxide at high temperature, FEO reacts with CAO to form low melting point ferrrate, so that the resistant material receives serious erosion.
