| Effects of dopants on the decomposition of synthetic wu¨stite and it`s pickling efficiency were throughly investigated. Chemicals, such as Li₂O, CaO and Al₂O₃ at a concentration of 0.8 wt.% were used as dopants. The isothermal decomposition temperature adopted in this study ranged from 380℃ to 530℃. The decomposition rate of wu¨stite at 460℃ was found to be significantly greaser than that at 380℃ and 530℃. The decomposition rate was increased with the addition of A1₂O₃ due to an increase in the vacancy concentration of wustite, whereas the rate was, decreased with the addition of Li₂O or CaO. Scales doped at two levels 3.23×10^(-4)g/㎠ and 5.38×10^(-4)g/㎠ were used for the pickling tests. The pickling rate of the scale was increased with the addition of either Li₂O or CaO to wu¨stite substrate, whereas decreased with the A1₂O₃ addition. It was also observed that those effects were enlarged with increasing the dopant concentration. |
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