【摘要】 通过在结晶器保护渣中添加Li2O和B2O3作助熔剂,在实验室内模拟渣膜的形成条件,结合岩相和扫描电镜能谱分析,研究了Li2O3和B2O3对含稀土氧化物保护渣结晶矿物组成的影响。结果表明稀土氧化物可以促进保护渣中枪晶石析出,抑制玻璃相形成,提高保护渣结晶率;当稀土氧化物含量达到一定数值,保护渣结晶矿物中可以形成稀土硅酸钙相,稀土氧化物继续增加,会有未溶稀土氧化物固态质点出现;保护渣中加入少量B2O3和Li2O作助熔剂,不仅可以促进硅灰石生成,而且能够有效抑制高熔点的枪晶石和稀土硅酸钙形成,防止渣膜形成过程中过早析出高熔点相。更多还原

【Abstract】 The formation condition of slag film was simulated by adding some Li₂O and B₂O₃ into the mold powder as new fluxes. The effect of Li₂O and B₂O₃ doping on the crystallization phase composition of mold fluxes bearing rare earth oxide was investigated by lithofacies and energy chart analysis in scanning electron microscopy. The results show that doping rare earth oxides can restrain the formation of glass phase, accelerate the growth of cuspidine phase and increase the crystallization ratio of mold fluxes. When the content of rare earth oxides reaches a certain value, RE₂O₃·CaO·2SiO₂ phase will be formed in the crystallization minerals of mold fluxes and un-dissolved parts will be separated out from mold fluxes with the increase of rare earth oxide. Adding a small amount of Li₂O and B₂O₃ as the fluxes not only can accelerate the growth of wollastonite phase, restrain the formation of cuspidine and RE₂O₃·CaO·2SiO₂ phase, but also can prevent the high melting point substance from being separated out when the slag film is formed with falling temperature.更多还原