Turning waste into treasure: Preparation, physical properties and microstructure of alkali-activated phosphorus tailings-based fully solid waste non-sintered lightweight aggregates

IF 10 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2025-09-29 DOI:10.1016/j.jclepro.2025.146693

Rubin Han , Hongxiu Leng , Hui Luo , Wenbo Wu , Yunrui Zhao , Bukai Song , Meng Liu , Bao-Jie He

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引用次数: 0

Abstract

Based on the potential safety risks associated with the buildup of solid waste in Lianyungang City, Jiangsu Province, and the dual challenges of high energy consumption and resource scarcity in conventional building material production. Herein, adhering to the concept of "total solid waste utilization", phosphorus tailings based artificial lightweight aggregates (PT-LWA) were fabricated through multi-component collaborative design, using phosphorus tailings (PT), fly ash (FA), soda residue (SR), and granulated blast furnace slag (GGBS) as the 100 % raw material system. A comprehensive analysis was conducted to assess how varying proportions of raw materials and diverse curing conditions influence physical performance, microstructural features, durability, release characteristics of heavy metals. Additionally, economic costs and economic emissions from PT-LWA were analyzed. The findings showed that the artificial lightweight aggregates exhibited optimal efficiency when fabricated with a raw material ratio of PT: FA: SR: GGBS = 40 %:20 %:30 %:10 % under 80 °C steam curing conditions. Specifically, the bulk density, softening coefficient, and 1-h water absorption of the resultant PT-LWA were 1038 kg/m³, 0.942, and 14.1 %, respectively. Additionally, the cylinder crush strength attained a value of 9.7 MPa, surpassing the performance observed in conventionally cured samples. Microstructural analysis revealed that the dominant hydration phases primarily consisted of C-(A)-S-H gel formations. They are evenly distributed on particle surfaces and form a robust colloidal structure, which further enhances its strength. The concentration values of released heavy metals are well below the thresholds defined by China's hazardous waste identification standards (GB 5085.3-2007), suggesting that PT-LWA will not cause secondary environmental pollution.

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变废为宝：碱活性磷尾矿基全固体废物非烧结轻骨料的制备、物理性能及微观结构

基于江苏省连云港市固体废弃物堆积量带来的安全隐患，以及传统建材生产中存在的高能耗和资源稀缺的双重挑战。本课题秉承“固体废物总量利用”的理念，以磷尾矿（PT）、粉煤灰（FA）、碱渣（SR）、粒状高炉矿渣（GGBS）为100%原料体系，通过多组分协同设计，制备磷尾矿基人工轻骨料（PT- lwa）。综合分析了不同原料比例和不同固化条件对材料物理性能、微观结构特征、耐久性、重金属释放特性的影响。此外，还分析了PT-LWA的经济成本和经济排放。结果表明，在80℃蒸汽养护条件下，PT: FA: SR: GGBS = 40%: 20%: 30%: 10%的原料配比制备人工轻质集料效果最佳。所得PT-LWA的容重、软化系数和1h吸水率分别为1038 kg/m3、0.942和14.1%。此外，圆柱体抗压强度达到9.7 MPa，超过了常规固化样品的性能。微观结构分析表明，主要水化相为C-(A)- s - h凝胶。它们均匀分布在颗粒表面，形成坚固的胶体结构，进一步增强了颗粒的强度。释放出的重金属浓度远低于中国危险废物鉴定标准（GB 5085.3-2007）规定的阈值，表明PT-LWA不会造成二次环境污染。

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来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.