| 引用本文: | 兰文涛,吴爱祥,王贻明,李剑秋.半水磷石膏充填强度影响因素试验[J].哈尔滨工业大学学报,2019,51(8):128.DOI:10.11918/j.issn.0367-6234.201804082 |
| LAN Wentao,WU Aixiang,WANG Yiming,LI Jianqiu.Experimental study on influencing factors of the filling strength of hemihydrate phosphogypsum[J].Journal of Harbin Institute of Technology,2019,51(8):128.DOI:10.11918/j.issn.0367-6234.201804082 |
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| 摘要: |
| 为充分利用半水磷石膏的胶凝活性,将半水磷石膏作为矿山充填胶凝材料,采用XRD、XRF和SEM分析半水磷石膏的物化性质和微观形貌；通过正交试验,确定半水磷石膏充填材料的最优配比为生石灰掺量1.5%、尾砂掺量0%、结晶水质量分数5%；单因素试验结果表明,半水磷石膏强度性能与生石灰掺量、搅拌时间正相关,与半水磷石膏结晶水质量分数、水溶磷质量分数、尾砂掺量负相关,为使半水磷石膏充填材料3 d强度达到3 MPa,充填材料中生石灰掺量应不少于1.5%,搅拌时间不少于10 min,同时,半水磷石膏原材料水溶磷质量分数应小于4%、结晶水质量分数应小于10.3%,尾砂掺量不大于60%.微观分析表明,各影响因素主要通过影响半水磷石膏水化产物晶体形貌、晶体结合触点的强度和水化产物体积率对半水磷石膏充填体强度产生影响. |
| 关键词: 半水磷石膏 微观结构 充填配比 影响因素 强度特性 |
| DOI：10.11918/j.issn.0367-6234.201804082 |
| 分类号:TD 853 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51674012) |
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| Experimental study on influencing factors of the filling strength of hemihydrate phosphogypsum |
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LAN Wentao1,2,WU Aixiang1,2,WANG Yiming1,2,LI Jianqiu3
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(1.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2.Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, Beijing 100083, China; 3.Guizhou CHANHEN Corporation, Fuquan 550500, Guizhou, China)
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| Abstract: |
| To make full use of the gelation activity of hemihydrate phosphogypsum and use hemihydrate phosphogypsum as mine filling cementing material, the physicochemical properties and micromorphology of hemihydrate phosphogypsum were analyzed by XRD, XRF, and SEM. Through the orthogonal experiment, the best ratio of hemihydrate phosphogypsum filling materials was obtained: the content of quicklime is 1.5%, the content of tailings is 0%, and the content of crystal water is 5%. The single-factor experiment shows that the strength of hemihydrate phosphogypsum has a positive correlation with the dosage of lime and the stirring time, and is negatively related to the content of crystal water, the content of water soluble phosphorus, and the amount of tailings mixed with hemihydrate phosphogypsum. To make the 3 d strength of the hemihydrate phosphogypsum filling material reach 3 MPa, the amount of lime in the filling material should no less than 1.5% and the stirring time no less than 10 minutes. At the same time, the content of water soluble phosphorus in the raw material of hemihydrate phosphogypsum should be less than 4%, the content of crystalline water should be less than 10.3%, and the content of the tailings no more than 60%. Microanalysis shows that the strength of hemihydrate phosphogypsum filling body is influenced by the crystal morphology of hydrated phosphogypsum, the strength of the contact, and the volume rate of hydration products. |
| Key words: hemihydrate phosphogypsum microstructure filling ratio influencing factor strength characteristics |
