Xiao Kejia, Yang Guangshao, Zhou Wei, Ran Qihao, Yao Xin, Xiao Rengui, Zhou Shaoqi
School of Resources and Environment, Guizhou University, Guiyang 550025, China.
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China.
Materials (Basel). 2025 Apr 14;18(8):1788. doi: 10.3390/ma18081788.
With the increasing demand for lithium resources and the enhancement of global environmental awareness, how to efficiently and environmentally develop clay-type lithium resources is of great strategic significance for future development. Clay-type lithium slag (LS) is a byproduct resulting from the extraction of lithium from clay-type lithium ores. Its primary chemical constituents include SiO and AlO, and it exhibits potential pozzolanic properties. Clay-type lithium ore is of low grade, so a large amount of clay-type LS is produced during its production. In this study, calcined clay-type LS, limestone powder (LP), and cement clinker were used as the main raw materials to prepare low-carbon LC cementitious materials. The study focused on the effect of clay-type LS and LP on the new mixing properties, mechanical properties, hydration kinetics, and microstructure formation and transformation of the cementitious materials. The findings revealed that incorporating clay-type LS and LP significantly raised the standard consistency water demand of cement and reduced the setting time of the binding material. While clay-type LS and LP initially weakened the mechanical performance of the cement mortar, it enhanced these properties in the later stages. The compressive strength of LC-10 and LC-20 at 180 days exceeded that of the reference by 3.7% and 1.1%, respectively. In addition, the number of micropores between 3 and 20 nm in LC cement increased significantly. It showed that the addition of clay-type LS and LP could optimize the pore structure to some extent. According to research, the optimal content of clay-type LS and LP should not exceed 30%. This method not only consumes the solid waste of clay-type LS, but also facilitates the green and low-carbon transformation of the cement industry.
随着对锂资源需求的不断增加以及全球环保意识的增强，如何高效、环保地开发黏土型锂资源对未来发展具有重大战略意义。黏土型锂渣（LS）是从黏土型锂矿石中提取锂产生的副产品。其主要化学成分包括SiO和AlO，具有潜在的火山灰活性。黏土型锂矿石品位较低，因此在生产过程中会产生大量的黏土型锂渣。本研究以煅烧后的黏土型锂渣、石灰石粉（LP）和水泥熟料为主要原料制备低碳LC胶凝材料。研究重点关注黏土型锂渣和石灰石粉对胶凝材料的新拌性能、力学性能、水化动力学以及微观结构形成与转变的影响。研究结果表明，掺入黏土型锂渣和石灰石粉显著提高了水泥的标准稠度需水量，缩短了胶凝材料的凝结时间。虽然黏土型锂渣和石灰石粉最初会削弱水泥砂浆的力学性能，但在后期会增强这些性能。LC - 10和LC - 20在180天时的抗压强度分别比基准样高出3.7%和1.1%。此外，LC水泥中3至20纳米之间的微孔数量显著增加。这表明添加黏土型锂渣和石灰石粉在一定程度上可以优化孔隙结构。研究表明，黏土型锂渣和石灰石粉的最佳掺量不应超过30%。该方法不仅消耗了黏土型锂渣这一固体废弃物，还促进了水泥行业的绿色低碳转型。
