铅锌尾矿烧结砖的制备及性能优化。

IF 3.1 3区 材料科学 Q3 CHEMISTRY, PHYSICAL
Materials Pub Date : 2025-03-20 DOI:10.3390/ma18061381
Dongliang He, Yanhui Cheng, Rui Li, Hang Lin
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引用次数: 0

摘要

铅锌尾矿是选矿冶炼过程中产生的废弃物,长期积累对环境和土壤构成潜在威胁。为实现资源循环利用和可持续发展,本研究以铅锌尾矿和粘土为原料,以玻璃粉为改性剂制备改性铅锌尾矿烧结砖。通过全因素试验和单因素试验,研究了物料配比、烧结温度和保温时间对烧结砖性能的影响。结果表明,玻璃粉的加入显著提高了烧结砖的抗压强度,降低了其吸水率,提高了其体积收缩率。最佳制备条件为:玻璃粉含量9%,铅锌尾矿含量90%,烧结温度1060℃,保温时间60 min。所制得的烧结砖达到普通烧结砖国家标准(GB/T5101-2017) mu30强度等级要求。烧结温度对砖的性能有显著影响;抗压强度先增大后减小,吸水率继续减小,体积变化由膨胀向收缩转变。保温时间的影响相对较弱,但随着保温时间的增加,烧结砖的抗压强度和吸水率逐渐趋于稳定。XRD和SEM分析表明,铅锌尾矿中的矿物在烧结过程中发生了分解和再结晶。玻璃粉的液相熔体填充孔隙,增强骨架强度,从而改善了烧结砖的微观结构和性能。研究结果为铅锌尾矿的高效利用和建材应用提供了理论依据和实践指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation and Performance Optimization of Lead-Zinc Tailing Sintered Bricks.

Lead-zinc tailings are waste materials generated from mineral processing and smelting, and their long-term accumulation poses potential threats to the environment and soil. To achieve resource recycling and sustainable development, this study used lead-zinc tailings and clay as raw materials and glass powder as a modifier to prepare modified lead-zinc tailing sintered bricks. Through full-factor experiments and single-factor experiments, the effects of the material proportions, the sintering temperature, and the holding time on the properties of the sintered bricks were investigated. The results show that the addition of glass powder significantly enhanced the compressive strength of the sintered bricks, reduced their water absorption rate, and improved their volume shrinkage rate. The optimal preparation conditions were as follows: 9% glass powder content, 90% lead-zinc tailings content, a sintering temperature of 1060 °C, and a holding time of 60 min. The resulting sintered bricks met the MU30-strength-grade requirements of the national standard for ordinary sintered bricks (GB/T5101-2017). The sintering temperature has a significant impact on brick performance; the compressive strength first increases, and then decreases, the water absorption rate continues to decrease, and volume change shifts from expansion to contraction. The influence of holding time was relatively weaker, but as the holding time increased, the compressive strength and the water absorption rate of the sintered bricks gradually stabilized. XRD and SEM analyses indicated that the minerals in the lead-zinc tailings decomposed and recrystallized during the sintering process. The liquid phase melt from the glass powder filled the pores and enhanced skeletal strength, thereby improving the microstructure and properties of the sintered bricks. The research findings provide a theoretical basis and practical guidance for the efficient utilization and building material application of lead-zinc tailings.

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来源期刊
Materials
Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
5.80
自引率
14.70%
发文量
7753
审稿时长
1.2 months
期刊介绍: Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.
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