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A platform for research: civil engineering, architecture and urbanism
Unfired magnesia-calcium brick and preparation method thereof
The invention provides an unfired magnesia-calcium brick and a preparation method thereof, and belongs to the field of refractory materials. The raw materials comprise aggregate, fine powder, graphite, a binding agent and a composite additive, wherein the composite additive contains calcium nitrate tetrahydrate. Compared with the prior art, the unfired magnesia-calcium brick has the advantages that the composite additive is evenly distributed in the unfired magnesia-calcium brick in a network shape, calcium nitrate tetrahydrate in the composite additive is subjected to a dehydration reaction in the brick blank drying process, even network-shaped cracks are formed in the finished product brick, and then the thermal shock resistance stability of the product is improved; (2) calcium nitrate formed by dehydrating calcium nitrate tetrahydrate has relatively strong water absorption, so that CaO in the brick is effectively prevented from being hydrated, and the hydration resistance of the product is improved; and (3) in the high-temperature use process of the finished unfired magnesia-calcium brick, calcium nitrate is molten and decomposed to be converted into high-activity CaO, and the high-activity CaO reacts with SiO2 introduced into the composite additive to form a binding phase, so that the medium-temperature performance of the unfired magnesia-calcium brick is improved.
本发明提供一种不烧镁钙砖及其制备方法，属于耐火材料领域。其原料包括骨料、细粉、石墨、结合剂和复合添加剂，所述复合添加剂中含有四水硝酸钙。本发明的不烧镁钙砖具有以下有益性能：（1）复合添加剂在不烧镁钙砖中呈网络状均匀分布，因复合添加剂中四水硝酸钙在砖坯干燥过程中的脱水反应，成品砖内形成了均匀的网络状裂纹，进而提升了产品的抗热震稳定性；（2）四水硝酸钙脱水形成的硝酸钙具有较强的吸水性，有效保护了砖中CaO不被水化，提升了产品的抗水化性能；（3）成品不烧镁钙砖在高温使用过程中，硝酸钙经历熔融、分解转变为高活性CaO，并与同为复合添加剂中引入的SiO2反应形成结合相，提升不烧镁钙砖的中温性能。
Unfired magnesia-calcium brick and preparation method thereof
The invention provides an unfired magnesia-calcium brick and a preparation method thereof, and belongs to the field of refractory materials. The raw materials comprise aggregate, fine powder, graphite, a binding agent and a composite additive, wherein the composite additive contains calcium nitrate tetrahydrate. Compared with the prior art, the unfired magnesia-calcium brick has the advantages that the composite additive is evenly distributed in the unfired magnesia-calcium brick in a network shape, calcium nitrate tetrahydrate in the composite additive is subjected to a dehydration reaction in the brick blank drying process, even network-shaped cracks are formed in the finished product brick, and then the thermal shock resistance stability of the product is improved; (2) calcium nitrate formed by dehydrating calcium nitrate tetrahydrate has relatively strong water absorption, so that CaO in the brick is effectively prevented from being hydrated, and the hydration resistance of the product is improved; and (3) in the high-temperature use process of the finished unfired magnesia-calcium brick, calcium nitrate is molten and decomposed to be converted into high-activity CaO, and the high-activity CaO reacts with SiO2 introduced into the composite additive to form a binding phase, so that the medium-temperature performance of the unfired magnesia-calcium brick is improved.
本发明提供一种不烧镁钙砖及其制备方法，属于耐火材料领域。其原料包括骨料、细粉、石墨、结合剂和复合添加剂，所述复合添加剂中含有四水硝酸钙。本发明的不烧镁钙砖具有以下有益性能：（1）复合添加剂在不烧镁钙砖中呈网络状均匀分布，因复合添加剂中四水硝酸钙在砖坯干燥过程中的脱水反应，成品砖内形成了均匀的网络状裂纹，进而提升了产品的抗热震稳定性；（2）四水硝酸钙脱水形成的硝酸钙具有较强的吸水性，有效保护了砖中CaO不被水化，提升了产品的抗水化性能；（3）成品不烧镁钙砖在高温使用过程中，硝酸钙经历熔融、分解转变为高活性CaO，并与同为复合添加剂中引入的SiO2反应形成结合相，提升不烧镁钙砖的中温性能。
Unfired magnesia-calcium brick and preparation method thereof
一种不烧镁钙砖及其制备方法
SUN YANG (author) / LIU CHUNQING (author) / ZHANG XIUHUA (author) / TIAN ZHIHONG (author) / QIAN YU (author)
2024-08-13
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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