掺加硼元素低温烧结氧化镁对磷酸镁水泥性能的

关键字：轻烧氧化镁；低温煅烧；硼元素；磷酸镁水泥

（1.辽宁科技大学 高温材料与镁资源工程学院，辽宁 鞍山  114051；2.辽宁省镁产业协同创新中心，辽宁 鞍山  114051）

    摘要：在轻烧氧化镁中分别以硼泥、硼酸和硼砂的方式引入B元素，在1200 ℃下煅烧3 h，替代重烧MgO和缓凝剂硼砂，分别按照镁磷比为3、4、5，水灰比0.28制备磷酸镁水泥。试验结果表明，在轻烧氧化镁中引入B元素在1200 ℃下煅烧的氧化镁可以代替重烧镁制备磷酸镁水泥，其中以硼砂引入B元素的方式中氧化镁晶粒的尺寸由900 nm增加到2700 nm，其活性由39.90%降低至1.08%。制备的磷酸镁水泥7 d抗压强度可以达到30 MPa，与重烧氧化镁制备的磷酸镁水泥强度相当，而成本大大降低。

    关键词：轻烧氧化镁；低温煅烧；硼元素；磷酸镁水泥

    中图分类号：TU526        文献标识码：A        文章编号：1001-702X（2018）05-0088-04

 

Effect of low temperature sintered magnesia adding B element on properties of magnesium phosphate cement

SUN Meishuo1，GUAN Yan2，BI Wanli2，YU Hongfa2，YAO Yunfei1

（1.School of High Temperature Material and Magnesium Resources Engineering，University of Science and Technology Liaoning，Anshan 114051，China；2.Collaborative Innovation Center of Liaoning Province Magnesium Industry，Anshan 114051，China）

   Abstract：The B element is introduced in the light burned MgO powder in the same way with the introduction of boron，boric acid and borax，calcining for 3 hours under 1200 ℃，replace dead burned MgO and retarder borax to prepare magnesium phosphate cement with M/P 3，4 and 5，and the cement ratio of 0.28. Results show that the magnesium oxide powder calcined under 1200 ℃ by introducing B elements in the light burned MgO can replace dead-burned magnesia in the preparation of magnesium phosphate cement，out of which，the grain size of magnesium oxide prepared with B elements introduced in the form of borax increased from 900 nm to 2700 nm，the activity reduced to 1.08% from 39.9%. The 7 d compressive strength of the prepared magnesium phosphate cement can be as high as 30 MPa，which is comparable to that of the MPC prepared with dead burned MgO powder，and the cost is greatly reduced.

    Key words：light burned MgO，low temperature calcination，boron element，magnesium phosphate cement