To obtain CaO clinker with high density, low po- rosity, and good hydration resistance, the effect of the La2 03 content on physical properties, such as sintering property and hydration resistance of CaO clinker was r...To obtain CaO clinker with high density, low po- rosity, and good hydration resistance, the effect of the La2 03 content on physical properties, such as sintering property and hydration resistance of CaO clinker was re- searched in this paper. Apparent porosity and bulk density were measured by Archimedes principle with kerosene as the medium. Two methods were used to test hydration resistance of CaO clinker. One was carried out in a hu- midity cabinet at 20℃ with 90% of relative humidity. Another was the boiling method. SEM and EDS charac- terization analyses of CaO clinker were pe.rformed to observe the microstructural information and the hydration mechanism was put forward. The results show that： （1） the specimen with 0.79 mass% of La2O3 addition has lower apparent porosity, and higher bulk density; （2） the hydration mass gain of CaO clinker with 0.79 mass% La2O3 addition is lower, which is less than 1% after 20 days ; （3） La2O3 mainly distributes in the grain boundary, attd a small amount of La203 dissolves in grains. The average grain size of CaO specimens with 0.79 mass% La2O3 addition sintered at 1 450℃, 1 550℃, and 1 650℃, is 44. 5 μm, 48. 6 μm, and 63. 5 μm , respectively; （4） solid solution is formed due to the similar ionic radius of La^3＋ and Ca^2＋, which promotes the sintering of CaO clinker and improves the hy- dration resistance simultaneously.展开更多
为了得到烧结致密,抗水化性好的烧结白云石,以钢渣为烧结剂制备了烧结白云石熟料。研究了钢渣种类(富铁钢渣、富铝钢渣)及加入量(加入质量分数分别为0.5%、1%、1.5%、2.0%、2.5%)对白云石熟料烧结性能、抗水化性以及荷重软化温度的影响...为了得到烧结致密,抗水化性好的烧结白云石,以钢渣为烧结剂制备了烧结白云石熟料。研究了钢渣种类(富铁钢渣、富铝钢渣)及加入量(加入质量分数分别为0.5%、1%、1.5%、2.0%、2.5%)对白云石熟料烧结性能、抗水化性以及荷重软化温度的影响。结果表明:引入钢渣后白云石熟料烧后收缩率增大,显气孔率降低,体积密度显著增加,抗水化性明显提高;与无烧结剂的对比,添加钢渣2.0%( w )后其荷重软化开始温度 t 0.6 下降约50 ℃,但其溃裂温度 t 2.0 均在1 700 ℃以上。展开更多
文摘To obtain CaO clinker with high density, low po- rosity, and good hydration resistance, the effect of the La2 03 content on physical properties, such as sintering property and hydration resistance of CaO clinker was re- searched in this paper. Apparent porosity and bulk density were measured by Archimedes principle with kerosene as the medium. Two methods were used to test hydration resistance of CaO clinker. One was carried out in a hu- midity cabinet at 20℃ with 90% of relative humidity. Another was the boiling method. SEM and EDS charac- terization analyses of CaO clinker were pe.rformed to observe the microstructural information and the hydration mechanism was put forward. The results show that： （1） the specimen with 0.79 mass% of La2O3 addition has lower apparent porosity, and higher bulk density; （2） the hydration mass gain of CaO clinker with 0.79 mass% La2O3 addition is lower, which is less than 1% after 20 days ; （3） La2O3 mainly distributes in the grain boundary, attd a small amount of La203 dissolves in grains. The average grain size of CaO specimens with 0.79 mass% La2O3 addition sintered at 1 450℃, 1 550℃, and 1 650℃, is 44. 5 μm, 48. 6 μm, and 63. 5 μm , respectively; （4） solid solution is formed due to the similar ionic radius of La^3＋ and Ca^2＋, which promotes the sintering of CaO clinker and improves the hy- dration resistance simultaneously.
文摘为了得到烧结致密,抗水化性好的烧结白云石,以钢渣为烧结剂制备了烧结白云石熟料。研究了钢渣种类(富铁钢渣、富铝钢渣)及加入量(加入质量分数分别为0.5%、1%、1.5%、2.0%、2.5%)对白云石熟料烧结性能、抗水化性以及荷重软化温度的影响。结果表明:引入钢渣后白云石熟料烧后收缩率增大,显气孔率降低,体积密度显著增加,抗水化性明显提高;与无烧结剂的对比,添加钢渣2.0%( w )后其荷重软化开始温度 t 0.6 下降约50 ℃,但其溃裂温度 t 2.0 均在1 700 ℃以上。
