赤泥的改性及其在水泥生产中的应用

来源期刊：有色金属2011年第1期

论文作者：任根宽

文章页码：123 - 126

关键词：环境工程； 赤泥； 水泥； 改性； 磷石膏

Key words：environment engineering； red mud； cement； modification； phosphogypsum

摘    要：采用酸性工业废渣磷石膏作为赤泥中和剂,降低赤泥中含碱量。通过在一定温度下煅烧赤泥和磷石膏的混合物,使低活性γ-2CaO·SiO₂转化为高活性的β-2CaO·SiO₂,提高赤泥的活性。结果表明,赤泥与磷石膏按10∶1比例混合后,在800℃进行煅烧,保温2h后自然冷却,用改性赤泥作为水泥的混合材,并取的良好效果。在水泥中掺45%的混合材,改性赤泥比赤泥用作混合材时后期强度提高近16%,水泥的各项物理性能仍能满足525^#水泥国标的要求。

Abstract: The alkali content in the red mud is reduced by neutralization with industrial slag.acidic phosphogypsum.The γ-2CaO·SiO₂ with low activity in the red mud is transformed into β-2CaO·SiO₂ with high activity by roasting the mixture of red mud and phosphogypsum under some temperature,so the activity of red mud is increased.The results indicate that the red mud modified with the proportion of red mud to phosphogypsum 10∶1,and roasted at 800℃ for 2h and natural cooling,as addition of cement,the favorable effect is achieved.With the comparison of the modified red mud and the red mud,the strength of cement is increased 16% with 45% admixture,physical properties of cement is consonant with 525^# the state standard request.