掺加硼元素低温烧结氧化镁对磷酸镁水泥性能的影响

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

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Mg O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。

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 un- der 1200 ℃ by introducing B elements in the light burned MgO can replace dead-burned magnesia in the preparation of magne- sium phosphate cement,out of which,the grain size of magnesium oxide prepared with B elements introduced in the form of borax increased from 900nm to 2700nm,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.