摘要
磷石膏充填是大宗固废处置和磷矿安全高效开采的重要途径,响应国家生态文明建设发展战略、符合绿色矿山可持续发展要求,应用前景广阔.本文系统分析了磷石膏材料性能与充填制备工艺、充填性能、充填污染风险与控制的研究成果,主要包括:(1)概述了磷石膏充填研究现状,介绍了相关研究成果产出及政策动态;(2)整理了国内外不同地区磷石膏化学成分、物理性能,分析了胶凝材料类型以及理论最佳化学计量组成范围,汇总了磷石膏充填料浆流变性能、力学性能影响因素及演化机理;(3)评价了磷石膏充填的潜在环境污染风险,总结了现有磷石膏预处理技术与有毒元素固定机理;(4)从预处理技术、靶向材料、原位监测三个方面对未来研究进行了展望.
China,a major producer of phosphogypsum,encounters significant environmental challenges owing to its accumulation.Employing phosphogypsum-based backfill is an effective solution for the safe and efficient mining of bulk solid waste from phosphate ores.It aligns with national ecological goals and promotes sustainable green mining practices.This method holds great potential for widespread application in China,where rapid advancements and significant scientific and technological achievements have been made.This paper systematically explores phosphogypsum-related progress,examining material characteristics,filling preparation processes,filling performance,filling pollution risks,and control strategies.(1)A quantitative analysis of relevant research results and policy trends has revealed a growing interest in phosphogypsum-based backfill,with an increasing number of technical papers and patents published annually.The rapid development of phosphogypsum-based backfill is closely linked to policy guidance.Since 2017,policies have explicitly encouraged the application of phosphogypsum in filling underground gob spaces.Phosphogypsum waste as a filling material for underground goaf is a general trend.(2)The study collated the chemical composition and physical properties of phosphogypsum from different regions,both domestically and internationally.It analyzed the types of cementitious materials,the theoretical optimal stoichiometric composition range,and summarized the factors and evolutionary mechanisms influencing the rheological and mechanical properties of phosphogypsum-based backfill.Typically,phosphogypsum appears gray-black or gray-white,with a pH value ranging from 1.2 to 6.Its main chemical components are CaO,SO3,and SiO2,and domestic phosphogypsum generally contains lower fluorine levels,ranging between 0.5%and 1.5%,compared to foreign samples.In addition to traditional factors such as slurry concentration,lime–sand ratio,and admixture,the composition and particle size of phosphogypsum,pretreatment methods,ambien
作者
陈秋松
吴爱祥
CHEN Qiusong;WU Aixiang(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《工程科学学报》
EI
北大核心
2025年第2期195-214,共20页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(52274151,52074351)。
关键词
磷石膏充填
膏体充填
胶结充填
绿色矿山
磷石膏
phosphogypsum-based backfill
cemented paste backfill
cemented backfill
green mine
phosphogypsum
