MgO对烧结矿软熔性能的影响

为进一步提高烧结矿的质量,考察了不同MgO质量分数烧结矿的高温冶金性能,并研究了MgO对烧结矿软熔性能的影响机理.试验结果表明,随着MgO质量分数的增加,烧结矿的软化区间不大,但由于初渣中含MgO的高熔点物质增多,烧结矿熔化带和软熔带区间显著增加,尤其对低碱度烧结矿的影响更加明显.试验条件下,MgO质量分数由1.3%增加至3.0%时,低碱度烧结矿(R=1.36)的软熔带温度区间从217.2℃增加到325.5℃;碱度R为1.76时,烧结矿软熔带温度区间从310.5℃增加到389.3℃.因此,降低烧结矿中MgO质量分数,有利于改善烧结矿的高温冶金性能.

Effect of MgO Content on Softening-Melting Property of Sinter

The high-temperature metallurgical properties of sinter were investigated to improve its quality, of which the MgO contents are different, as well as the influencing mechanism of MgO on sinter. The experimental results showed that no obvious interzonal difference is found in softening temperature with increasing mass fraction of MgO, while the interzonal differences are obvious in melting and softening-melting temperature because of the increasing high melting-point MgO-containing substances in early slag. Such a result is more obvious for low-basicity sinter. Under the experimental conditions, when the mass fraction of MgO increases from 1.3% to 3.0%, the temperature of softening-melting zone of low-basicity sinter (R = 1.36) increases from 217.2°C to 325.5°C. But, for the high-basicity sinter (R = 1.76), it increases from 310.5°C to 389.3°C. A conclusion is thus drawn that decreasing MgO content is beneficial to improving the high-temperature metallurgical properties of sinter.