铅锌尾矿改性磷酸镁水泥：提高机械强度和降低浸出毒性的双重效益

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-07 DOI:10.1016/j.conbuildmat.2025.143906

Jianfeng Li , Linjie Chen , Bin Li , Bing Chen

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引用次数: 0

摘要

铅锌尾矿是铅锌矿在开采和选矿过程中产生的工业副产物，长期以来无法得到有效利用，对自然环境造成诸多不利影响。研究了LZTs对磷酸镁水泥（MPC）性能的影响，并探讨了LZTs-MPC的浸出毒性。结果表明，LZTs提高了MPC的可加工性，降低了其水化热。LZTs可以提高MPC的抗压强度。当LZTs替代MgO 20% %时，MPC 28d抗压强度达到最大值55.1 MPa，比对照组提高17.5 %。在MPC中掺入LZTs并没有形成新的晶相，LZTs主要作为细团聚体存在。适量的LZTs改善了MPC基体的完整性和致密性，从而提高了MPC的机械强度。高添加量的LZTs进一步促进鸟粪石的形成，弥补了机械强度的损失，为LZTs的大规模回收利用提供了可能。此外，MPC对LZTs中有害元素具有良好的凝固/稳定效果，对铅、锌和镉元素的凝固/稳定效率均超过97% %。

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Modification of magnesium phosphate cement by lead-zinc tailings: Dual benefits in mechanical strength enhancement and leaching toxicity reduction

Lead-zinc tailings (LZTs) are industrial by-products generated during the mining and beneficiation of lead-zinc mines, which have long been unable to be effectively utilized, causing numerous adverse effects to natural environment. This study investigated effects of LZTs on the properties of magnesium phosphate cement (MPC) and explored leaching toxicity of LZTs-MPC. The results showed that LZTs improved the workability of MPC and decreased its hydration heat. LZTs could enhance the compressive strength of MPC. When LZTs replaced 20 % of MgO, the 28d compressive strength of MPC reached its maximum value of 55.1 MPa, which was 17.5 % higher than that of control group. The incorporation of LZTs into MPC did not result in the formation of new crystalline phases and LZTs primarily served as fine aggregate. An appropriate amount of LZTs improved integrity and compactness of MPC matrix, thereby enhancing the mechanical strength of MPC. High addition of LZTs further promoted formation of struvite, which compensated for the loss of mechanical strength and made it possible for the large-scale recycling and utilization of LZTs. In addition, MPC exhibited an excellent solidification/stabilization effect to harmful elements in LZTs, with solidification/stabilization efficiency all surpassing 97 % for lead, zinc and cadmium elements.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.