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为了消除保护渣在使用过程中氟溶解到水中造成的危害,提出了开发高Al2O3含量的保护渣.研究了不同含量的Al2O3对保护渣熔渣水浸液中F-质量浓度和p H值的影响,并利用X射线光电子能谱分析了Al2O3含量对保护渣熔渣结构的影响.当Al2O3的质量分数为4%时,保护渣迁移到水中的F-质量浓度为22.8~35.4 mg·L-1,p H值的变化范围为4.0~9.5;当Al2O3的质量分数由4%增加到34%,F-质量浓度和p H值的变化范围均是先急剧减小后略有增加的趋势.X射线光电子能谱分析显示:增加保护渣中Al2O3的含量时,保护渣中Al2O3通过形成Al—F共价键,抑制了氟的浸出.控制保护渣中Al2O3的质量分数在16%~34%的范围,则实验水样中F-质量浓度在4.0~10.0 mg·L-1的范围,p H值在6.5~7.5的近中性范围,可减弱氟浸出造成的危害.
In order to eliminate the harm caused by fluoride dissolved in water during the use of mold flux, a method was proposed to develop mold flux with high content of Al2O3.The effects of different contents of Al2O3 on F-mass concentration and p H value in slag flooding solution , And the effect of Al2O3 content on the slag structure was analyzed by X-ray photoelectron spectroscopy.When the mass fraction of Al2O3 is 4%, the F-mass concentration of the fluxes transferred to water is 22.8-35.4 mg · L- 1, p H value ranged from 4.0 to 9.5. When the mass fraction of Al2O3 increased from 4% to 34%, the variation range of F-mass concentration and p H value both increased slightly and then increased slightly. The X-ray photoelectron spectroscopy analysis showed that when the content of Al2O3 in the mold powder was increased, the Al 2 O 3 flux in the mold powder inhibited the leaching of fluorine, and the mass fraction of Al 2 O 3 in the flux was 16% -34% , The experimental water samples with F-mass concentration in the range of 4.0-10.0 mg · L-1 and p H value in the range of 6.5-7.5 can reduce the harm caused by fluorine leaching.