磷石膏-铜尾矿砂混合料的土工性能及微观机理研究

摘要/Abstract

摘要： 为实现固废资源大宗利用及“以废治废”的目的,将磷石膏与铜尾矿砂拌和制备成混合料,外掺水泥用于公路路基填筑。通过对混合料进行土工性能试验,探索磷石膏与铜尾矿砂的质量比对混合料土工性能的影响,结合现代分析测试方法,对混合料的硬化机理及微观变化进行研究。结果表明:磷石膏液限较高而铜尾矿砂强度特性较低,两者都无法单独作为路基填筑材料使用,当磷石膏与铜尾矿砂按质量比4∶6混合使用时,混合料的土工性能较佳;混合料硬化是水泥水化导致的,水化产物中的钙矾石、C-S-H凝胶等能够填补混合料颗粒间隙,形成紧密集合体,致使混合料硬化。

关键词: 磷石膏, 铜尾矿砂, 路基填筑, 土工性能, 微观机理

Abstract: The phosphogypsum and copper tailings sand are mixed to prepare a mixture, and cement is added for highway roadbed filling, which can realize the large-scale utilization of solid waste resources and the purpose of “waste treatment by waste”. The geotechnical performance test of the mixture was used to explore the influence of the mass ratio of phosphogypsum and copper tailings sand on the mixture’s geotechnical performance, combined with modern analysis and testing technology to study the hydration-hardening mechanism and micro-mechanism of the mixture. The results show that neither phosphogypsum nor copper tailings sand can be used alone as roadbed filling materials because of the higher liquid limit of phosphogypsum and the lower strength characteristics of copper tailings sand. When phosphogypsum and copper tailings sand are mixed with a mass ratio of 4∶6, the geotechnical performance of the mixture was better. The hardening of the mixture is caused by the hydration of the cement. Hydration products such as ettringite and C-S-H gel can fill the gap between the particles of the mixture and form a compact aggregate, which causes the mixture to harden.

Key words: phosphogypsum, copper tailings sand, roadbed construction, geotechnical performance, micro-mechanism

中图分类号:

TU599

从金瑶, 杨恒, 涂博, 祁庆龙, 王海龙. 磷石膏-铜尾矿砂混合料的土工性能及微观机理研究[J]. 硅酸盐通报, 2022, 41(2): 685-692.

CONG Jinyao, YANG Heng, TU Bo, QI Qinglong, WANG Hailong. Geotechnical Performance and Micro-Mechanism of Phosphogypsum-Copper Tailings Sand Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 685-692.

参考文献

[1] 付强强,沈彦辉,陈宏坤,等.磷石膏综合利用现状及建议[J].磷肥与复肥,2020,35(8):44-46.
FU Q Q, SHEN Y H, CHEN H K, et al. Present situation and suggestions of comprehensive utilization of phosphogypsum[J]. Phosphate & Compound Fertilizer, 2020, 35(8): 44-46 (in Chinese).
[2] 白海丹.我国磷石膏综合利用形势及对策建议[J].磷肥与复肥,2020,35(12):1-3.
BAI H D. Situation and countermeasures of comprehensive utilization of phosphogypsum in China[J]. Phosphate & Compound Fertilizer, 2020, 35(12): 1-3 (in Chinese).
[3] 李纯,薛鹏丽,张文静,等.我国磷石膏处置现状及绿色发展对策[J].化工环保,2021,41(1):102-106.
LI C, XUE P L, ZHANG W J, et al. Disposal status of phosphogypsum in China and countermeasures for green development[J]. Environmental Protection of Chemical Industry, 2021, 41(1): 102-106 (in Chinese).
[4] 徐雪源,徐玉中,陈桂松,等.工业废料磷石膏的工程特性试验研究[J].岩石力学与工程学报,2004,23(12):2096-2099.
XU X Y, XU Y Z, CHEN G S, et al. Testing study on engineering characteristics of phosphogypsum[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(12): 2096-2099 (in Chinese).
[5] 米占宽,饶徐生,储学群,等.沉积磷石膏的物理力学特性试验研究[J].岩土工程学报,2015,37(3):470-478.
MI Z K, RAO X S, CHU X Q, et al. Physico-mechanical properties of deposition phosphogypsum[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(3): 470-478 (in Chinese).
[6] 孟维正,蒋关鲁,袁德昭,等.改良磷石膏的路用性能[J/OL].建筑材料学报:1-13[2021-09-01].http://kns.cnki.net/kcms/detail/31.1764.TU.20201028.1123.026.html.
MENG W Z, JIANG G L, YUAN D Z, et al. Road performance of modified phosphogypsum[J/OL]. Journal of Building Materials: 1-13 [2021-09-01]. http://kns.cnki.net/kcms/detail/31.1764.TU.20201028.1123.026.html (in Chinese).
[7] 丁建文,石名磊,刘维正.道路底基层中磷石膏-石灰二灰土再生试验研究与应用[J].东南大学学报(自然科学版),2009,39(1):121-126.
DING J W, SHI M L, LIU W Z. Reusing test study and application of phosphogypsum-lime solidified soil in road base course[J]. Journal of Southeast University (Natural Science Edition), 2009, 39(1): 121-126 (in Chinese).
[8] 李志清,沈鑫.硅酸钠改良水泥基稳定磷石膏在路面基层中的试验研究[J].工程地质学报,2019,27(1):80-87.
LI Z Q, SHEN X. Experimental study on cement-based stabilized phosphogypsum modified by sodium silicate in pavement base[J]. Journal of Engineering Geology, 2019, 27(1): 80-87 (in Chinese).
[9] 克高果,夏正求,罗辉,等.煅烧磷石膏改性磷石膏废料的路用性能[J].土木工程与管理学报,2018,35(4):58-64.
KE G G, XIA Z Q, LUO H, et al. Performance of phosphogypsum waste modified by calcined phosphogypsum in highway engineering[J]. Journal of Civil Engineering and Management, 2018, 35(4): 58-64 (in Chinese).
[10] 刘海营,杨航,钱志博,等.铜尾矿资源化利用技术进展[J].中国矿业,2020,29(s2):117-120.
LIU H Y, YANG H, QIAN Z B, et al. Technical progress in resource utilization of copper tailings[J]. China Mining Magazine, 2020, 29(s2): 117-120 (in Chinese).
[11] 陈甲斌,王海军,余良晖.铜矿尾矿资源调查评价、利用现状、问题与政策[J].国土资源情报,2011(12):14-20.
CHEN J B, WANG H J, YU L H. Investigation and evaluation of copper tailings and its utilization status, problems and policies[J]. Land and Resources Information, 2011(12): 14-20 (in Chinese).
[12] AHMADI A, REZAEI M, SADEGHIEH S M. Interaction effects of flotation reagents for SAG mill reject of copper sulphide ore using response surface methodology[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(3): 792-806.
[13] LIU S H, KONG Y N, WANG L. Hydration mechanism of low quality fly ash in cement-based materials[J]. Journal of Central South University, 2014, 21(11): 4360-4367.
[14] 张云升,孙伟,贾艳涛,等.用IR探索地聚合物水泥硬化产物的组成和结构[J].武汉理工大学学报,2005,27(11):27-30
ZHANG Y S, SUN W, JIA Y T, et al. Composition and structure of hardened geopolymer products using infrared ray analysis methods[J]. Journal of Wuhan University of Technology, 2005, 27(11): 27-30 (in Chinese)
[15] GARCIA-LODEIRO I, GORACCI G, DOLADO J S, et al. Mineralogical and microstructural alterations in a Portland cement paste after an accelerated decalcification process[J]. Cement and Concrete Research, 2021, 140: 106312.
[16] 权娟娟,张凯峰,王可娜.改性磷石膏对石膏矿渣水泥水化过程的影响研究[J].硅酸盐通报,2017,36(12):4033-4037+4043.
QUAN J J, ZHANG K F, WANG K N. Effect of modified phosphogypsum on the hydration process of gypsum slag cement[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(12): 4033-4037+4043 (in Chinese).
[17] HAGAG M S, MORSY A M A, ALI A H, et al. Adsorption of rare earth elements onto the phosphogypsum a waste byproduct[J]. Water, Air, & Soil Pollution, 2019, 230(12): 1-14.
[18] WANG Y H, REN J W. The flotation of quartz from iron minerals with a combined quaternary ammonium salt[J]. International Journal of Mineral Processing, 2005, 77(2): 116-122.
[19] 孙凤久,楼丹花,李莉娟.方解石晶体振动模式群论分析和红外光谱的DFT[J].东北大学学报(自然科学版),2008,29(1):145-148.
SUN F J, LOU D H, LI L J. Group theory based analysis of crystal vibration modes of calcite and DFT study on its infrared spectra[J]. Journal of Northeastern University (Natural Science), 2008, 29(1): 145-148 (in Chinese).
[20] ESSAM A K. Effect of stearic acid on ettringite formation[J]. Journal of Materials Science & Technology, 2002, 18(3): 263-265.
[21] 赵晋津,任书霞,袁富荣.硅酸盐水泥改性机理的IR曲线拟合研究[J].硅酸盐通报,2013,32(5):847-851.
ZHAO J J, REN S X, YUAN F R. Study on IR curve fitting on the modified mechanism of Portland cement[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(5): 847-851 (in Chinese).
[22] 杜明霞,王进明,董发勤,等.磷石膏工艺矿物学特征与可选性关系研究[J].非金属矿,2020,43(6):52-55.
DU M X, WANG J M, DONG F Q, et al. Technological mineralogical characteristics of phosphogypsum[J]. Non-Metallic Mines, 2020, 43(6): 52-55 (in Chinese).
[23] 林海,周创兵,陈菲,等.铜尾砂和钨尾砂的抗剪强度及宏细观分析[J].工程地质学报,2019,27(2):317-324.
LIN H, ZHOU C B, CHEN F, et al. Shear strength and macro-micro analysis of copper tailings and tungsten tailings[J]. Journal of Engineering Geology, 2019, 27(2): 317-324 (in Chinese).