赵宏博
,
程树森
,
白永强
,
马金芳
,
万雷
,
王尉平
钢铁
为了模拟高炉块状带内矿石还原过程对料层透气性的影响，根据实际高炉料层的运动升温及煤气成分的变化情况，设计了模拟矿石在高炉块状带行程的试验方法，建立了能够实时监测料层压差和矿石还原度的试验装置，给出了矿石逐渐升温还原对料层透气性影响的量化评价指标，并实测了某高炉烧结矿、球团矿、块矿、混合矿石在逐渐升温过程中的料层压差和还原度变化，得出逐渐升温还原后的粉化指标和料层压差增加率具有很好的一致性。与原有的低温还原粉化测试方法相比，该方法更适合用于判断高炉整个块状带内矿石还原对料层透气性的影响，更有利于评价矿石性能对高炉操作的影响。试验还研究了原始粒径、还原失重、还原温度、还原时间、加热、转鼓、泡水对矿石粉化程度的影响。
关键词:
高炉
,
lump zone
,
reduction degradation
,
permeability
W.L. Zhang
,
B.Q. Jiang
,
Y.S. Sun
,
F. Lin and L. Gu Chemical Engineering Department of Nanchang University
,
Nanchang 330029
,
China
金属学报(英文版)
A stable colloidal boehmite sol was made with the aluminium iso propoxide made in China and used to prepare the supported γ alumina membrane using sol gel method. The γ alumina thin layer was characterized by SEM, N 2 sorption method and permeation measurement. The γ alumina membrane was prepared with uniform surface, thickness of 3 μm and average diameter of about 5 nm. The permeabilities of the single gases of H 2, N 2, Ar and their separation factors were measured. The experimental data explained a behavior of Knudsen diffusion for the gas transport through the thin membrane.
关键词:
boehmite
,
null
,
null
,
null
