Drop quench technique and rotating disk method have been used to investigate the solubilities and dissolution rates of MgO and MgCr_2O_4 in calcium ferrite based slags under oxygen potentials from 3.73 X 10~(-4) to 10~(-8) atm at 1300°C. Effects of copper oxide in the slags on the solubilities were also examined under a CO_2 atmosphere. The results showed that the solubilities of the two oxides in copper free calcium ferrite slags were low (MgO: ～ 2.0 wt% and MgCr_2O_4: ≤ 1.0 wt%), and varied with oxygen potential. Cu_2O in the slags tended to increase their solubilities under a CO_2 atmosphere. The dissolution rates of dense MgO and MgCr_2O_4 under an oxygen potential of 10~(-6) atm were found in the same order of magnitude, i.e. 1.4 ～ 2.3 X 10~(-6) g·cm~(-2)·s~(-1) at a rotation speed of 300 rpm. However, under an oxygen potential of 10~(-8) atm, the dissolution rate was approximately 40 times higher, e.g. ～ 6.1 X 10~(-5) g·cm~(-2)·s~(-1) for MgO. At the oxygen potential of 10~(-8) atm, in the case of MgO, the slag had attained saturation after one hour, while the MgCr_2O_4 refractory sample had totally disintegrated, implying physical erosion dominated wear. The intermediate phases formed at the interface showed a significant impact on the dissolution/erosion rates of these two oxides in calcium ferrite based slags.
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机译：在3.73 X 10〜（-4）至10〜（-8）atm的氧势下，采用滴淬技术和转盘法研究了MgO和MgCr_2O_4在铁氧体钙渣中的溶解度和溶解速率。 。在CO_2气氛下，还研究了炉渣中氧化铜对溶解度的影响。结果表明，两种氧化物在无铜铁氧体钙渣中的溶解度较低（MgO：〜2.0 wt％，MgCr_2O_4：≤1.0 wt％），并且随着氧势的变化而变化。在CO_2气氛下，炉渣中的Cu_2O倾向于增加其溶解度。氧势为10〜（-6）atm时，致密MgO和MgCr_2O_4的溶出度处于相同的数量级，即1.4〜2.3 X 10〜（-6）g·cm〜（-2）·s 〜（-1）在300 rpm的转速下。然而，在10〜（-8）atm的氧势下，溶解速率大约是40倍，例如约3倍。 MgO约为6.1 X 10〜（-5）g·cm〜（-2）·s〜（-1）。在10〜（-8）atm的氧势下，在MgO的情况下，炉渣在1小时后达到饱和，而MgCr_2O_4耐火样品完全分解，这意味着物理侵蚀占主导地位。在界面处形成的中间相显示出对这两种氧化物在铁氧体钙基炉渣中的溶解/腐蚀速率的显着影响。
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