Author details

∙m/s4

4 /(kg<sup>2</sup> ∙m4 )

2 /(kg∙m)

2 /(kg∙m)

/s2

/s2

were in a good agreement with the experimental results. According to the operating phase diagram of fluidization obtained by this model, the stable fluidization and the

3. Mg- and Ca-coating Fe2O3 particles were shown to significantly extend the defluidization time, and this inhibition effect was increased by increasing the addition amount. A coating layer on the surface was found to mainly contain magnesiowustite (MgOFeO) and calciowustite (CaOFeO) generated by the reactions between Mg/Ca oxides and Fe2O3/ FeO during reduction process, and this coating layer was effective in preventing the connection of precipitated iron. And compared with CaO, MgO was more effective in delaying defluidization at the same conditions, because the unstable calciowustite was

reduced to metallic iron and cannot completely suppress the precipitation of iron.

A Proportional constant for adhesion force kg<sup>2</sup>

b Radius of the connection between the particles m Cd Drag coefficient (Cd)mfs Drag coefficient in initial fluidization dp Mean particle size m Es Activation of surface viscosity J/mol Fad Adhesion force kg∙m/s2 Fd Drag force kg∙m/s2 K Regressive constant s

Na Number group for adhesion force s

(Na)mfs Number group for adhesion force in initial fluidization s

Nd Number group for drag force kg∙m3

(Nd)mfs Number group for drag force in initial fluidization kg∙m3

Re Reynolds number T Bed temperature C Tdef Defluidization temperature C (Tdef)cal Theoretical results of Tdef C (Tdef)exp Experimental results of Tdef C t Connect time of two particles S

R Gas constant J/(K∙mol)

defluidization region were determined.

Nomenclature

120 Iron Ores and Iron Oxide Materials

Yiwei Zhong1 \*, Jintao Gao<sup>1</sup> , Zhancheng Guo<sup>1</sup> and Zhi Wang<sup>2</sup>

\*Address all correspondence to: ywzhong@ustb.edu.cn

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing, PR China

2 Institute of Process Engineering, Chinese Academy of Sciences, Zhongguancun, Haidian District, Beijing, PR China
