- 史美潔,鄧 敏,謝禮蘭,湯金輝
2013年第1期
摘要
引用本文
摘 要:研究了非洲一種石灰石中的氟磷灰石對水泥生料的易燒性、熟料礦物組成、礦物形貌和強度發展的影響。結果表明,在1300℃和1350℃時,隨著熟料中P2O5含量的增加,氟磷灰石對生料易燒性改善顯著;在1400℃和1450℃時,熟料中P2O5含量的增加對生料易燒性改善不明顯。熟料中P2O5含量為0.05%~1.50%時,熟料礦物相中A礦較多,礦物晶形發育良好。熟料中P2O5含量為2.00%~5.00%時,A礦形狀不規則,大小不均勻。隨著熟料中P2O5含量的增加,熟料中C3S、C3A和C4AF含量趨于減少,水泥3d強度和28d強度都逐漸降低。熟料中P2O5含量為0.05%~1.50%時,生產出的水泥均可滿足42.5級普通硅酸鹽水泥國家標準中對強度的要求。結合生料易燒性、熟料礦物巖相及水泥強度實驗分析認為,熟料中P2O5含量宜控制在1.50%以內。
Abstract: Effects of fluorapatite in limestone from Africa on burnability, mineral composition, mineral morphology and compressive strength of the clinker are analyzed. It is found that with the increase of the P2O5 in clinker, the effect of fluorapatite on improving burnability of raw meals is positive and significant at 1300℃ and 1350℃, and not obvious at 1400℃ and 1450℃. The content of C3S, C3A and C4AF in clinkers decrease with the increasing of the P2O5 content. When the content of P2O5 in clinker is between 0.05% and 1.50%, the significant amount of well-developed alite is formed. When the content of P2O5 in clinker is between 2.00% and 5.00%, alite is mainly irregular and inhomogeneous. The strengths of cement pastes at 3d and 28d would have a gradual decline with the increasing of the P2O5 content. When the content of P2O5 in clinker is not more than 1.50%, cements produced may meet the strength requirements of 42.5 Portland cement national standards. It is analyzed that the amount of P2O5 in clinker should not be more than 1.50% combined with burnability of raw meals, microstructure of the clinker and strength of the cement.