升温制度对铁尾矿基陶粒性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0322

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (8): 2996-3004.DOI: 10.16552/j.cnki.issn1001-1625.2025.0322

升温制度对铁尾矿基陶粒性能的影响

柴倩¹, 陈柳霖¹, 张恬恬¹, 程丰梅¹, 汪永鑫¹, 肖文轩¹, 张会¹, 贺攀阳²

1.西安建筑科技大学华清学院,西安 710043;
2.西安建筑科技大学资源工程学院,西安 710055

收稿日期:2025-03-20 修订日期:2025-06-17 出版日期:2025-08-15 发布日期:2025-08-22
通信作者: 贺攀阳,博士,副教授。E-mail:hepanyang@xauat.edu.cn
作者简介:柴倩(1988—),女,讲师。主要从事固体废弃物资源化的研究。E-mail:chaiqian1126@126.com
基金资助:
陕西省教育厅一般专项项目(23JK0523);陕西省大学生创新计划项目(S202413679011);校级科研项目(24KY06)

Effect of Heating Regime on Performance of Iron Tailings-Based Ceramsite

CHAI Qian¹, CHEN Liulin¹, ZHANG Tiantian¹, CHENG Fengmei¹, WANG Yongxin¹, XIAO Wenxuan¹, ZHANG Hui¹, HE Panyang²

1. Huaqing College, Xi'an University of Architecture and Technology, Xi'an 710043, China;
2. School of Resource Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received:2025-03-20 Revised:2025-06-17 Published:2025-08-15 Online:2025-08-22

摘要/Abstract

摘要： 将堆存量大的铁尾矿回收利用作为陶粒生产的主要原料,可有效缓解环境污染问题、实现资源的可持续发展。为优化升温制度以实现节能减排、降本增效,本文基于热重分析原料的热力学行为确定预热温度为700 ℃,最高烧成温度为1 125 ℃,采用两段式升温烧制陶粒,探究了不同升温制度对铁尾矿基陶粒性能的影响。结果表明:在700 ℃之前采用20 ℃/min的快速升温;在700~1 125 ℃,采用5 ℃/min慢速升温时,制备的铁尾矿基陶粒性能及烧成热耗的综合能效达到最佳,单颗粒抗压强度为11.50 MPa,显气孔率为20.77%,表观密度为1 903 kg/m³,比强度为6 040 N·m/kg,1 h吸水率为9.81%,24 h吸水率为10.93%;中低温烧成阶段快速升温在外观及强度保持较好状态时可加速气体释放,提高显气孔率,高温烧成区间降低升温速率可促进液相的生成、固相反应的发生,有助于强度的提高。XRD结果表明,原料经高温煅烧生成了辉石、透长石、钙硅石等新的矿物相,高温阶段慢速升温可提高生成矿物相的含量。

关键词: 铁尾矿, 陶粒, 升温速率, 矿物相分析, 烧结, 外观形貌, 显气孔率

Abstract: Utilizing large-stockpiled iron tailings as the primary raw material for ceramsite production effectively mitigates environmental pollution issues and advances sustainable resource development. To optimize the heating regime for energy conservation, emission reduction, cost efficiency, and performance enhancement, this study established a preheating temperature of 700 ℃ and a maximum sintering temperature of 1 125 ℃ based on thermogravimetric analysis of the raw material's thermodynamic behavior. A two-stage heating process for sintering was employed, and the impact of varying heating regimes on the performance of iron tailings-based ceramsite was systematically investigated. The results demonstrate that the optimal comprehensive energy efficiency is achieved under the rapid heating regime of 20 ℃/min to 700 ℃ followed by the slow heating regime of 5 ℃/min to 1 125 ℃ by balancing the performance and sintering energy consumption of iron tailings-based ceramsite. Under this condition, the single-particle compressive strength is 11.50 MPa, the apparent porosity is 20.77%, the apparent density is 1 903 kg/m³, the specific strength is 6 040 N·m/kg, the 1 h water absorption rate is 9.81%, and the 24 h water absorption rate is 10.93%. During medium-to-low temperature sintering stage, rapid heating accelerates gas evolution, and enhances apparent porosity while preserving structural integrity and mechanical strength. Conversely, reducing the heating rate in the high-temperature sintering range can promote the formation of liquid phase and solid-phase reactions, which benefits the improvement of strength. XRD analysis reveals that high-temperature sintering of the raw material generates new mineral phases including augite, sanidine, and rankinite. Notably, reducing the heating rate during the high-temperature stage significantly enhances the content of these mineral phases.

Key words: iron tailings, ceramsite, heating rate, mineral phase analysis, sintering, appearance morphology, apparent porosity

中图分类号:

TQ174

柴倩, 陈柳霖, 张恬恬, 程丰梅, 汪永鑫, 肖文轩, 张会, 贺攀阳. 升温制度对铁尾矿基陶粒性能的影响[J]. 硅酸盐通报, 2025, 44(8): 2996-3004.

CHAI Qian, CHEN Liulin, ZHANG Tiantian, CHENG Fengmei, WANG Yongxin, XIAO Wenxuan, ZHANG Hui, HE Panyang. Effect of Heating Regime on Performance of Iron Tailings-Based Ceramsite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2996-3004.

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升温制度对铁尾矿基陶粒性能的影响

Effect of Heating Regime on Performance of Iron Tailings-Based Ceramsite

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