机械化学对CaO材料烧结及抗水化性的影响

Effect of Mechano-chemistry on the Sintering and Hydration Resistance of CaO Clinker

采用机械化学法 ,以 Ca CO3 和 Ca(OH) 2 为原料 ,研究了机械活化时间对 Ca CO3-Ca(OH) 2 复合粉体烧结及抗水化性的影响。结果表明 ,机械活化可导致 Ca CO3-Ca(OH) 2 复合粉体颗粒细化 ,比表面积增大 ,晶粒变小 ,晶格畸变 ,并趋于无定形化 ,因而更容易烧结而高度致密化 ,抗水化性能得到明显提高。以 w(Ca CO3) / w(Ca(OH) 2 ) =80 / 2 0为原料 ,经行星式球磨机活化 3 6h后 ,在 150 0℃× 3 h烧成 ,制得相对密度高达 98.8%的 Ca O熟料。该熟料在温度为 2 5℃、相对湿度为 95%的条件下 ,15d后的水化增重率为 2 .3 7%。

Applying the mechano chemistry method, raw material of CaCO 3 and Ca(OH) 2, the influence of the time of mechanical active on the hydration resistance has been investigated in this paper. The results show that the mechanical activation can greatly improve the hydration resistance due to the finer of CaCO 3 Ca(OH) 2 composite powder, the increase of specific area, the obvious decrease of the crystal size and the aberrance of crystal lattice as well as the tendency of amorphism, which would benefit the process for sintering and densification. Through milling the raw material of CaCO 3/Ca(OH) 2 with the weigh ratio of 80/20 in a planet ball milling for 36 hours and sintered at 1 500 ℃ for 3 hours, high density CaO clinker with relative density of 98.8% has been prepared. The hydration resistance of this material has been tested under the relative humidity of 95% at 25 ℃, the mass increment rate is 2.37%.