Shi Linyun, Kuang Jingzhong, Qiu Tingsheng
Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilization of Strategic Metal Mineral Resources, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Jiangxi Building Materials Research and Design Institute Co., Ltd., Nanchang 330001, China.
Materials (Basel). 2024 Aug 1;17(15):3781. doi: 10.3390/ma17153781.
Mechanical grinding is a common method used to enhance the pozzolanic activity of tailings, and these activated tailings can be used as supplementary cementitious materials in cement production. However, the addition of activated tailings usually reduces the workability of cement paste, and the mechanism of influence of different minerals in tailings on workability varies. In this study, three kinds of principal silicate minerals in tailings-quartz, feldspar, and mica-were mechanically activated. The influence of these activated minerals on the rheological properties of cement paste were studied in the absence or presence of PCE (polycarboxylate ether) superplasticizers, and the influence mechanism was investigated using rheology, TOC, contact angles, zeta potential, XPS, ICP-OES, and XRD. The results showed that quartz has the highest fluidity, and mica has the lowest. An increase in hydrophilicity decreased the flowability of the blended cement paste. The increase in the metal cation dissolution rate was the main reason for the decrease in the fluidity of PCE-blended cement pastes. The knowledge gained provides a valuable reference for the utilization of activated tailings in cement production.
机械粉磨是一种常用于提高尾矿火山灰活性的方法，这些活性尾矿可作为水泥生产中的辅助胶凝材料。然而，添加活性尾矿通常会降低水泥浆的工作性，且尾矿中不同矿物对工作性的影响机制各不相同。在本研究中，对尾矿中的三种主要硅酸盐矿物——石英、长石和云母进行了机械活化。研究了这些活化矿物在有无聚羧酸醚（PCE）高效减水剂情况下对水泥浆流变性能的影响，并采用流变学、TOC、接触角、zeta电位、XPS、ICP - OES和XRD研究了其影响机制。结果表明，石英的流动性最高，云母的流动性最低。亲水性增加会降低混合水泥浆的流动性。金属阳离子溶解速率的增加是PCE混合水泥浆流动性降低的主要原因。所获得的知识为活性尾矿在水泥生产中的利用提供了有价值的参考。
