不同处理方式对镁渣理化特性的影响

Effect of different treatment methods on the physico-chemical properties of magnesium slag(MS)

皮江法炼镁过程产生大量镁渣,镁渣的随意堆放会引发严重的环境问题。镁渣的理化特性对镁渣的综合利用有较大的影响。通过氮自动吸附仪(BET法)、X射线荧光光谱仪(XRF)、傅里叶红外光谱仪(FTIR)、X射线衍射仪(XRD)和扫描电镜(SEM),研究了自然冷、风冷和水淬3种处理方式对镁渣理化特性的影响。结果表明:镁渣为碱性废渣;不同处理方式对镁渣的冷却速度不同,因此对镁渣的粒径分布、孔分布、矿物组成、微观形态均有明显的影响,冷却速度越快粒径越大、孔径越大、比表面积越大、γ-硅酸二钙含量越低、β-硅酸二钙含量越高。

A lot of magnesium slag（MS） is produced in the production of metallic magnesium by Pidgeon′s reduction method,and the random dispose of magnesium slag caused serious environmental problems.The physico-chemical properties of magnesium slag have a big effect on its comprehensive utilization.The influences of three treatment methods,such as natural cooling,air cooling,and water quenching on physico-chemical properties of MS after furnacing,were studied by BET,XRF,FTIR,XRD,and SEM. The results indicated that MS was a kind of alkali slag; the different cooling methods can lead to great different in the physico-chemical properties,such as particle distribution,pore distribution,mineral composition,and micro morphology of treated slags;The bigger particle,pore size,and specific surface area,the lower content of γ-C2 S and the higher content of β-C2 S could be obtained for the higher cooling rate.