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A platform for research: civil engineering, architecture and urbanism
Low-heat Portland cement and preparation method thereof
The invention relates to the technical field of low-heat cement, and discloses low-heat Portland cement and a preparation method thereof.The low-heat Portland cement is obtained by mixing and grinding low-heat cement clinker and gypsum; the low-heat cement clinker is prepared by the following steps: pre-decomposing raw material powder, sintering in a cement kiln, mixing and melting with coal ash, discharging from the kiln, and cooling, the raw material powder comprises limestone, clay, iron ore and a NaF auxiliary agent. In the sintering process of the low-heat cement clinker, a trace amount of NaF additive is dispersed in a liquid phase, so that the grindability of dicalcium silicate and tetracalcium aluminoferrite in the low-heat cement clinker can be improved, and meanwhile, the problem of hydration stagnation of C4AF caused by coating of aluminum colloid or iron colloid formed in the early stage of hydration around the C4AF can be avoided, so that the hydration activity of the C4AF is improved, and the service life of the low-heat cement clinker is prolonged. Rapid formation and interweaving of hydration products are promoted, and the early strength of the low-heat cement is effectively improved.
本发明涉及低热水泥技术领域，公开了一种低热硅酸盐水泥及其制备方法，一种低热硅酸盐水泥，所述低热硅酸盐水泥是由低热水泥熟料与石膏混合粉磨而得；所述低热水泥熟料是由生料粉经预分解后，在水泥窑内烧结并与煤灰混合熔融后，经出窑后冷却形成而得；所述生料粉包括石灰石、粘土、铁矿石以及NaF助剂。本发明通过在低热水泥熟料烧结过程中，使液相中分散微量的NaF助剂，能够改善低热水泥熟料中硅酸二钙、铁铝酸四钙的易磨性，同时能规避在水化早期形成的铝质胶体或铁质胶体包覆在C4AF周围而导致C4AF水化停滞的问题，从而提升了C4AF的水化活性，并促进水化产物快速形成和交织，有效提升了低热水泥的早期强度。
Low-heat Portland cement and preparation method thereof
The invention relates to the technical field of low-heat cement, and discloses low-heat Portland cement and a preparation method thereof.The low-heat Portland cement is obtained by mixing and grinding low-heat cement clinker and gypsum; the low-heat cement clinker is prepared by the following steps: pre-decomposing raw material powder, sintering in a cement kiln, mixing and melting with coal ash, discharging from the kiln, and cooling, the raw material powder comprises limestone, clay, iron ore and a NaF auxiliary agent. In the sintering process of the low-heat cement clinker, a trace amount of NaF additive is dispersed in a liquid phase, so that the grindability of dicalcium silicate and tetracalcium aluminoferrite in the low-heat cement clinker can be improved, and meanwhile, the problem of hydration stagnation of C4AF caused by coating of aluminum colloid or iron colloid formed in the early stage of hydration around the C4AF can be avoided, so that the hydration activity of the C4AF is improved, and the service life of the low-heat cement clinker is prolonged. Rapid formation and interweaving of hydration products are promoted, and the early strength of the low-heat cement is effectively improved.
本发明涉及低热水泥技术领域，公开了一种低热硅酸盐水泥及其制备方法，一种低热硅酸盐水泥，所述低热硅酸盐水泥是由低热水泥熟料与石膏混合粉磨而得；所述低热水泥熟料是由生料粉经预分解后，在水泥窑内烧结并与煤灰混合熔融后，经出窑后冷却形成而得；所述生料粉包括石灰石、粘土、铁矿石以及NaF助剂。本发明通过在低热水泥熟料烧结过程中，使液相中分散微量的NaF助剂，能够改善低热水泥熟料中硅酸二钙、铁铝酸四钙的易磨性，同时能规避在水化早期形成的铝质胶体或铁质胶体包覆在C4AF周围而导致C4AF水化停滞的问题，从而提升了C4AF的水化活性，并促进水化产物快速形成和交织，有效提升了低热水泥的早期强度。
Low-heat Portland cement and preparation method thereof
一种低热硅酸盐水泥及其制备方法
LABACIREN (author) / JIANG CHANGCHUN (author) / ZUO GUANGWEI (author) / LONG YONGJUN (author)
2024-02-06
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Medium-heat Portland cement and preparation method thereof
| European Patent Office | 2024