High-activity and low-shrinkage composite mineral admixture and preparation method thereof

The invention discloses a high-activity and low-shrinkage composite mineral admixture and a preparation method thereof, and relates to the technical field of concrete mineral admixtures. The composite mineral admixture comprises the following raw material components in percentage by weight: 15%-25% of lithium slag, 30%-50% of granulated electric furnace phosphorus slag, 10%-20% of ferrovanadium slag, 10%-15% of nickel slag, 5%-10% of sulphoaluminate cement clinker, 0.05%-0.1% of a super plasticizer and 0.3%-0.05% of an early strength grinding aid. According to the admixture, the synergistic and complementary effects of different types of smelting slag and raw materials are fully exerted, and the shrinkage resistance and high activity of the composite mineral admixture from the early stage to the later stage are achieved. 本发明公开了一种高活性、低收缩复合矿物掺合料及其制备方法，涉及混凝土矿物掺合料技术领域。本发明的复合矿物掺合料包括以下重量百分比的原料组分：锂渣15%~25%、粒化电炉磷渣30%~50%、钒铁矿渣10%~20%、镍渣10%~15%、硫铝酸盐水泥熟料5%~10%、超塑化剂0.5~1.0‰、早强型助磨剂0.3~0.5‰。本发明的掺合料充分发挥了不同类别冶渣和原料的协同互补作用，实现复