为探究煅烧前后煤矸石粉对改性硫氧镁水泥性能的影响，首先在不同温度（0、600、800 ℃）下煅烧得到煤矸石粉，然后将其作为骨料分别掺入制备改性硫氧镁水泥，并利用X射线衍射、扫描电镜及压汞仪对水泥的物相组成、微观形貌及孔隙率进行测试，分析其对改性硫氧镁水泥力学性能、耐水耐酸性能、微观形貌和孔结构的影响。实验结果表明，掺入800 ℃煅烧后的煤矸石粉能够提升改性硫氧镁水泥的抗压强度，当掺量为15%时，水泥28 d抗压强度最高，是基准试件的130%，同时可提高水泥的耐水耐酸性能。掺入煤矸石粉可以改善改性硫氧镁水泥的微观结构，促进5·1·7相的生长，使得形貌更加致密。20%EG/MOS浸水浸酸后，大于100 nm孔径占比降低，小于10 nm孔径占比增加，表明掺入20%经800 ℃煅烧后的煤矸石粉可以抵御水和酸性液体的渗透和溶解，强化了水泥的耐水性和稳定性。

In order to explore the effect of coal gangue powder on the properties of modified magnesia sulfide cement before and after calcination，coal gangue powder was firstly calcined at different temperatures（0，600，800 ℃），and then mixed as aggregate to prepare modified magnesia sulfide cement，and X-ray diffraction，scanning electron microscopy and mercury injection instrument were used to test the phase composition，microscopic morphology and porosity of the cement.The effects on mechanical properties，water and acid resistance，micro-morphology and pore structure of modified magnesium sulfide cement were analyzed.The test results showed that the addition of coal gangue powder calcined at 800 ℃ could improve the compressive strength of the modified magnesium sulfide cement.When the addition amount was 15%，the maximum compressive strength of the cement at 28 days，which was 130% of the reference sample.At the same time，the water and acid resistance of the cement could be improved.The addition of coal gangue powder could improve the microstructure of modified magnesia sulfide cement，promote the growth of 5·1·7 phase，and make the morphology more dense.20%EG/MOS after leaching，the proportion of pore size greater than 100 nm was decreased，and the proportion of pore size less than 10 nm was increased，indicating that the addition of coal gangue powder calcined at 800 ℃ mass 20% could resist the penetration and dissolution of water and acidic liquid，and strengthen the water resistance and stability of the cement.