矿产保护与利用2024，Vol.44Issue(6)：103-112,10.DOI:10.13779/j.cnki.issn1001-0076.2024.06.007
息烽磷矿颗粒级配优选废石-料浆胶结充填实验
Experimental Study on Particle Grading Priority of Waste Rock-Slurry Bonding Filling in Xifeng Phosphate Mine
摘要
Abstract
To reduce the cost of filling and the potential safety hazards caused by the accumulation of waste rock in the waste dump,the waste rock-slurry cemented filling process is adopted in Xifeng Phosphorite Mine.Through a combination of research methods such as the response surface method,technical and economic analysis and microstructure characterization,the sensitivity of the main influencing factors was analyzed.Besides,the filling ratio parameters were optimized,and the mechanism of the hydration products was revealed.The research results indicated that the sensitivity of the influencing factors of the uniaxial compressive strength of the filling body is in the order of slurry concentration>cement to fly ash mass ratio>ash to rock ratio.Under the conditions of 55%slurry concentration,ash-to-rock ratio of 7∶20,and cement-to-fly ash ratio of 87∶100,the strength of the filling body reaches 10.60 MPa,saving a total cost of over 1.31 million yuan/100,000 t of filling material per year.The pore structure of the optimized filling bodies is filled with hydration products such as calcium silicate(C-S-H),calcium hydroxide(CH)and alumina(AFt)in combination with fly ash that is not involved in the hydration reaction.The microstructure is dense and has strong resistance to external compression damage.The research results can provide a theoretical basis and technical support for the safe mining of open-pit to underground filling.关键词
胶结充填/响应曲面法/废石/粉煤灰Key words
cemented filling/response surface method/waste rock/fly ash分类
矿业与冶金引用本文复制引用
刘德峰,熊志洋,郑彦涛,任金华,王良群,朱复兴..息烽磷矿颗粒级配优选废石-料浆胶结充填实验[J].矿产保护与利用,2024,44(6):103-112,10.基金项目
黔科合成果项目([2023]一般777) （[2023]一般777）
国家磷资源开发利用工程技术研究中心开放基金(LKF202005) （LKF202005）
