摘要
Volume 43,Number 2,2009 Refractories for RH degassers and ways of improving RH lining life. Chen Zhaoyou. (81-95). -Refractories for RH,Refine slag resistance,Magnesite-chrome brick,Structural spalling,Silicon steel-This paper attempts to clarify the systematic works of the refractories for the RH degassers and the ways of improving RH lining life. It includes:(1)Types of RH degassers. (2)The operating conditions of refining and the severely damaged areas in RH degassers. (3)The reasions why side wall and bottom of lower vessel,throat and snorkels become the severe wear areas are analyzed,such as erosion and abrasion caused by the high circulation rate of treated molten steel,thermal and structural spalling by the violent temperature change,high corrosion by the Fe-oxides containing siliceous slag and CaF2-riched desulfurization powders attack,degradation of texture by the vaporisation of refractory components in vacuum and in oxygen blowing. Besides the above mentioned factors,another reason making the snorkels become the most quick wear elements is also explained. (4)The studies of resistance to refining slags attack and slag penetration and its prevention. The evaluation of various refractory materials to withstand the attack of slags is based on the experimental results of rotating cylinder method,rotary drum test and induction furnace test,and the phase diagrams analyses. The measures to reduce the slag penetration are discussed,for example the depth of slag penetration can be decreased by reducing the size of brick pores. (5)Suitable refractory materials selection and recent developments for the different severe wear areas in RH,and lining maintenance. (6)Refractories for RH to refine silicon steel. (7)The ways of improving RH lining life.
