Effect of different types of magnesia-carbon bricks on corrosion resistance of vanadium-rich slag
At present,magnesia-carbon brick is used as the lining of vanadium extraction converter.It is of great practical value to evaluate the erosion rate and damage mechanism of different types of magnesia-carbon bricks for improving the service life of vanadium extraction converter.The static slag resistance method was used to simulate the erosion of six kinds of magnesia-carbon bricks under the condition of resistance furnace,and the corrosion resist-ance and mechanism of magnesia-carbon bricks to vanadium-rich slag were discussed.The results show that MT-C12B and MT-C14A samples are less thinned after erosion by slag.Among them,the erosion area of MT-C12B ac-counts for 2.98％,and the erosion area of MT-C14A accounts for 2.74％.From the microstructure of the sample e-rosion,the decarburization layer depth of MT-C12B is the smallest,which has little effect on the performance of magnesia-carbon brick,and is the best choice for vanadium extraction converter.The corrosion mechanism of the six magnesia-carbon bricks is basically the same.The graphite in the magnesia-carbon brick reacts with V2O3,Cr2O3 and FeO in the slag to form a metal phase,resulting in the exposure of MgO particles.The V2O3 in the slag enters the decarburization layer with the slag,reacts with MgO here,and forms a vanadium-containing spinel phase(MgV2O4)on the surface of the magnesia-carbon brick.Moreover,SiO2 and CaO in the liquid slag phase react with MgO particles to form a new low melting point liquid slag phase,and then complete the dissolution process of peri-clase.The formation of vanadium-containing spinel phase on the surface of MgO-C brick can significantly increase the densification degree of decarburization layer and prevent the further penetration of slag.Therefore,the erosion rate of the material gradually decreases,and finally a relatively slow erosion process is formed.The research results can provide a basis for improving the lining life of vanadium extraction converter.
magnesia-carbon brickvanadium-rich slagerosion areaerosion mechanismstatic erosion test
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NSTL
万方数据
维普
