Study on strengthening mechanism of iron tailings-based geopolymers by activation pretreatment at medium temperature

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Mar.2025, Vol.48 No.3: 353-359

DOI: 10.3969/j.issn.1003-5060.2025.03.010

Authors

TANG Lei $ ^{1,2} $, ZHAN Xinyuan $ ^{1,2} $, YUE Zhengbo $ ^{1,2} $, WANG Jin $ ^{1,2} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes, Hefei 230009, China)

Abstract and Keywords

Abstract: Iron tailings have a huge stock in China, occupying a large amount of land and causing harm to the environment. As a new cementing material, geopolymers can effectively solve this problem. In this study, geopolymers were prepared using iron tailings from Ma'anshan City as raw material. Through orthogonal experiment, it was found that the compressive strength of the geopolymers reached 18.7 MPa after 28 days of curing with the following optimum mixing ratio: water cement ratio of 0.26, modulus of 1.8, and alkali equivalent of 0.08. Based on the optimum ratio, the effect of different calcination temperatures on the activation of the geopolymers prepared from iron tailings was studied. The results showed that the geopolymers obtained after calcination at 700 °C had the best performance, and the compressive strength could reach 26.9 MPa after curing for 28 days. The samples were characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD) and scanning electron microscope (SEM). After activation at 700 °C, the phase of iron tailing mineral changed, and more active silicon and aluminum elements were generated. Under the action of

Keywords: iron tailings; activation; geopolymer; cementing material; compressive strength

作者信息

汤磊 $ ^{1,2} $，詹欣源 $ ^{1,2} $，岳正波 $ ^{1,2} $，王进 $ ^{1,2} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 纳米矿物与污染控制安徽普通高校重点实验室，安徽合肥 230009)

摘要和关键词

摘要: 铁尾矿在我国堆存量巨大，占据大量土地的同时对环境也造成一定危害，地聚物作为新型胶凝材料可以有效解决该问题。文章以马鞍山铁尾矿为原料，通过正交试验得出铁尾矿基地聚物在水灰比为0.26、模数为1.8、碱当量为0.08的最佳配比下，制备的铁尾矿基地聚物养护28 d抗压强度达到18.7 MPa。以最佳配比为基础，研究不同煅烧温度对铁尾矿制备地聚物的活化影响，结果表明700 ℃煅烧后得到的地聚物性能最好，养护28 d后抗压强度可达到26.9 MPa。通过傅里叶变换红外光谱仪（Fourier transform infrared spectrometer，FTIR）、X射线衍射仪（X-ray diffractometer，XRD）、扫描电子显微镜（scanning electron microscope，SEM）等分析可知，经过700 ℃中温活化后，铁尾矿物相发生变化，生成更多的活性硅铝元素，在碱激发剂作用下比未煅烧铁尾矿生成更多的C-(A)-S-H和N-A-S-H凝胶产物，并且C-(A)-S-H凝胶产物为主要产物，地聚物抗压强度得到强化。

关键词: 铁尾矿；活化；地聚物；胶凝材料；抗压强度

Funding

国家自然科学基金青年科学基金资助项目（52100139）；中央高校基本科研业务费专项资金资助项目（JZ2021HGQA0267）

合肥工业大学学报(自然科学版)

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