Dong Qing, Jia Lifeng, Liang Bing, Yin Wanlei
School of Mechanical and Aviation Manufacturing Engineering, Anyang Institute of Technology, Anyang, China.
School of Flight, Anyang Institute of Technology, Anyang, China.
Environ Geochem Health. 2025 Jul 28;47(9):343. doi: 10.1007/s10653-025-02648-w.
Cemented paste backfill (CPB) has emerged as a leading solution for waste-free mining. However, lead-zinc tailings often contains pyrite minerals, exploring the influence of sulfide on the CPB is an important prerequisite for mining environment and safety. Tailings with four sulfur contents (2 wt%(natural tailings), 5 wt%, 10 wt%, 15 wt%) static acidity potentials were predicted by using acid base accounting(ABA) and net acid generation(NAG) methods. The failure mode and compressive strength of specimens in 28 to 360 days were analyzed. Results indicated that tailings with sulfur contents of 2 wt%, 5 wt% and 10 wt% didn' t produce acid, while 15 wt% sulfur content tailings produced acid. High sulfur tailings should be paid attention to environmental pollution issues. The strength first increased and then decreased, the sulfur content of 5 wt% CPB reached the highest strength of 3.6 MPa at 90 days. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis revealed that with the increase of time and sulfur content, the content of gypsum and ettringite increased, while hydrated calcium silicate decreased. A damage constitutive model of the CPB after strength degradation was established. The stress-strain fitting curve was in good agreement with experimental curve. The critical damage value of reached 0.57 at 360 days with the sulfur content of 15 wt% CPB. The analysis of variance indicated that both sulfur content and time had a significant impact on the strength, and the influence of sulfur content was greater than that of time. A negative exponential function between sulfur content, time, and strength was proposed. The research results could provide some theoretical basis for resolving pollution problems and management of sulfur containing tailings.
胶结膏体回填（CPB）已成为无废采矿的主要解决方案。然而，铅锌尾矿通常含有黄铁矿矿物，探究硫化物对CPB的影响是采矿环境与安全的重要前提。采用酸碱平衡法（ABA）和净产酸量法（NAG）预测了四种硫含量（2wt%（天然尾矿）、5wt%、10wt%、15wt%）尾矿的静态酸度潜力。分析了28至360天内试件的破坏模式和抗压强度。结果表明，硫含量为2wt%、5wt%和10wt%的尾矿不产酸，而硫含量为15wt%的尾矿产酸。高硫尾矿应注意环境污染问题。强度先增大后减小，硫含量为5wt%的CPB在90天时达到最高强度3.6MPa。X射线衍射（XRD）和扫描电子显微镜（SEM）分析表明，随着时间和硫含量的增加，石膏和钙矾石含量增加，而硅酸钙水化物减少。建立了强度退化后CPB的损伤本构模型。应力-应变拟合曲线与试验曲线吻合良好。硫含量为15wt%的CPB在360天时的临界损伤值达到0.57。方差分析表明，硫含量和时间对强度均有显著影响，且硫含量的影响大于时间。提出了硫含量、时间和强度之间的负指数函数关系。研究结果可为解决含硫尾矿污染问题及管理提供一定的理论依据。
