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磷石膏协同多元固废制备矿山充填材料

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为解决磷石膏利用率低、对环境危害大与低成本矿山充填材料研制的问题,本文以粉煤灰、钢渣、高炉矿渣为胶凝材料组分,协同磷石膏制备一种新型的磷石膏基矿山充填材料.通过抗压强度、流动度、凝结时间、浸出毒性和微观试验研究了充填材料的工程与环境特性.结果表明:所研制的矿山充填材料的抗压强度、流动度、凝结时间均能满足规范,达到工程应用需求;在养护 28 d后,充填材料的重金属元素的浸出浓度都可以满足地下水Ⅲ级标准的要求,不会污染环境和危害人体健康.当钢渣和高炉矿渣的掺量逐渐增加时,抗压强度逐渐升高,流动度和凝结时间逐渐降低;充填材料中主要的水化产物是钙矾石和C—(A)—S—H凝胶,两者都为充填材料提供了主要的强度,且C—(A)—S—H凝胶可以包裹住重金属离子.
Preparation of Mine Backfill Material from Phosphogypsum Synergistic Multifunctional Solid Waste
In order to solve the problems of low utilization of phosphogypsum environmental hazards and development of low-cost mine backfill material,this paper prepares a new type of phosphogypsum-based mine backfill material in synergy with phosphogypsum by using fly ash,steel slag,and ground granulated furnace blast slag as the components of the gelling material.The engineering and environmental characteristics of the backfill material were investigated by compressive strength,flowabili-ty,setting time,Toxicity leaching and microscopic tests.The results show that:the compressive strength,flowability and setting time of the developed backfill material can meet the specifications and meet the requirements of engineering applications;after 28 d of maintenance,the leaching concentration of heavy metal elements of the backfill material can meet the requirements of the Ⅲ standard of the groundwater,and it will not pollute the environment and jeopardize the health of human beings.When the dosage of steel slag and ground granulated furnace blast slag gradually increased,the compressive strength gradually increased,and the flowability and setting time gradually decreased;the main hydration products in the backfill material were ettringtie and C—(A)—S—H gel,both of which provided the main strength for the backfill material,and the C—(A)—S—H gel could en-capsulate the heavy metal ions.

phosphogypsumfly ashsteel slagground granulated furnace blast slagmine backfill materialengineering performancetoxicity characteristic leaching

杨玉翰、邬忠虎、冯政、雷文丽

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贵州大学土木工程学院,贵州 贵阳 550025

磷石膏 粉煤灰 钢渣 高炉矿渣 矿山充填材料 工程性能 毒性浸出

国家自然科学基金项目贵州省科技支撑项目贵州省优秀青年科技人才项目

52104080黔科合支撑[2023]一般136黔科合平台人才培养计划—YQK[2023]012

2024

10.19614/j.cnki.jsks.202406031

金属矿山
中钢集团马鞍山矿山研究院 中国金属学会

金属矿山

CSTPCD北大核心
影响因子：0.935
ISSN：1001-1250
年,卷(期)：2024.(6)