摘要
采用Al-Si-Fe合金为还原剂,在真空条件下热还原煅后白云石(煅白)制备金属镁。通过对产物的XRD衍射及所得镁还原率的分析,研究了CaF2和MgF2对还原过程的影响。结果表明:在其他条件相同的情况下,氟盐的加入可以明显加速还原反应;在氟盐添加量1%~5%内,镁还原率随氟盐添加量增大而增大,而后呈现平缓的趋势;氟盐在对还原过程的加速效果随温度增加而下降;同等质量的CaF2和MgF2,CaF2对反应加速效果较好。此外,初步探讨了氟盐对Al-Si-Fe合金热法制镁过程的影响机理,氟盐的加入提高了煅白表面氧化物的活性,促进还原反应的进行,从而提高了镁还原率。氟盐在反应中并非起到单纯的加速作用,同时自身转变为新物质。
Magnesium production by vacuum Al-Si-Fe alloy thermal reduction of dolime.The effect of villiaumite on reduction process was studied by the XRD pattern of residue and the analysis of reduction rate of magnesium from dolime.The results show that the villiaumite can accelerate reduction significantly under the same condition of none-villiaumite addition;within the addition of villiaumite as 1%~5%,the reduction rate is increased with increasing the addition ratio firstly and flattening finally;the accelerating...
出处
《轻金属》
CSCD
北大核心
2010年第5期42-44,共3页
Light Metals
关键词
镁冶金
AL-SI-FE合金
热还原
氟盐
magnesium metallurgy
Al-Si-Fe alloy
thermal reduction
villiaumite
