煤矸石基人造集料影响因素及成型机制分析

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4099-4106.

煤矸石基人造集料影响因素及成型机制分析

赵有南¹, 闫人伟¹, 张太庆¹, 翟新明¹, 王昊宇², 邓威², 熊锐²

1.青海省果洛公路工程建设有限公司,西宁 810008;
2.长安大学材料科学与工程学院,西安 710061

收稿日期:2024-05-06 修订日期:2024-06-21 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 熊锐,博士,副教授。E-mail:xiongr61@126.com
作者简介:赵有南(1981—),男,高级工程师。主要从事公路工程施工方向的研究。E-mail:ljf14322023@163.com
基金资助:
青海省重点研发与转化计划项目(2023-SF-124)

Analysis of Influencing Factors and Forming Mechanism of Artificial Aggregate Based on Coal Gangue

ZHAO Younan¹, YAN Renwei¹, ZHANG Taiqing¹, ZHAI Xinming¹, WANG Haoyu², DENG Wei², XIONG Rui²

1. Qinghai Guoluo Highway Engineering Construction Co., Ltd., Xining 810008, China;
2. School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China

Received:2024-05-06 Revised:2024-06-21 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 煤矸石经煅烧处理后呈现良好的力学性能,具备烧制成集料的潜力。研究了煤矸石/长石的不同配比、成型压力及煅烧温度对集料物理性能的影响,并采用灰熵法对各影响因素显著性进行了分析;借助SEM及XRD对集料微观形貌与晶相组成进行了探究。结果表明:原料配比与煅烧温度均对集料物理性能影响显著;煤矸石比例过高降低了体系中液相含量及液相黏度,且煅烧产生的气体无法逸出导致集料内部形成较多孔隙及微裂纹,劣化了集料力学特性,而提高长石粉比例及煅烧温度有利于晶体成核;随着钾钠霞石熔融,K⁺、Na⁺含量增加并与[AlSiO₄]结合形成钾长石与钙长石,促进集料内部结构密实。本研究可为促进煤矸石的精准消纳提供有益参考。

关键词: 煤矸石, 长石, 人造集料, 晶相组成, 物理性能, 成型机制

Abstract: After calcination treatment, coal gangue exhibits good mechanical properties and has the potential to be fired into aggregates. This study investigated the effects of different ratios of coal gangue to feldspar, forming pressure and calcination temperature on the physical properties of aggregates, and analyzed the significance of each influencing factor using the grey correlation method. The microstructure and phase composition of the aggregates were explored using SEM and XRD. The results indicate that both the raw material ratio and calcination temperature significantly affect the physical properties of the aggregates. A high proportion of coal gangue reduces the liquid phase content and viscosity in the system, and the inability of gases produced during calcination to escape leads to the formation of more pores and microcracks inside the aggregates, degrading their mechanical properties. Increasing the proportion of feldspar powder and the calcination temperature promotes crystal nucleation. As potassium-sodium feldspar melts, the K⁺ and Na⁺ content increases and combines with [AlSiO₄] to form potash feldspar and plagioclase, promoting a dense internal structure of the aggregates. This study provides valuable insights for the precise utilization of coal gangue.

Key words: coal gangue, feldspar, artificial aggregate, phase composition, physical property, forming mechanism

中图分类号:

U414

赵有南, 闫人伟, 张太庆, 翟新明, 王昊宇, 邓威, 熊锐. 煤矸石基人造集料影响因素及成型机制分析[J]. 硅酸盐通报, 2024, 43(11): 4099-4106.

ZHAO Younan, YAN Renwei, ZHANG Taiqing, ZHAI Xinming, WANG Haoyu, DENG Wei, XIONG Rui. Analysis of Influencing Factors and Forming Mechanism of Artificial Aggregate Based on Coal Gangue[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4099-4106.

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