新型胶凝充填材料制备及固化机理分析
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摘要
为考察新型胶凝材料半水磷石膏应用于矿山充填的可能性。对不同磷石膏、碱性激发剂添加量及料浆浓度进行配比,确定半水磷石膏基充填材料最优配比,并利用SEM和石膏水化理论对半水磷石膏基充填体进行分析。研究结果表明:在磷石膏添加量为50%,碱性激发剂添加量为1.5%,充填料浆浓度为69%时,半水磷石膏基充填料的3、7、28 d强度分别为3.0、3.8、3.8 MPa,满足当地矿山充填采矿的要求。半水磷石膏水化生成二水石膏,随着水化反应的继续,试样的内部孔隙逐渐被水化产物填充,生成的二水石膏晶体形成胶凝材料结构骨架,使充填材料具有一定的强度。
In order to investigate the possibility of applying the new cementitious material,hemi-hydrated phosphogypsum,into backfilling of mine,the optimum ratio of hemi-hydrated phosphogypsum filling material was determined by adjusting the proportion of different phosphogypsum,dosage of alkali activator and slurry concentration,and the property of the hemi-hydrated phosphogypsum filling body was analyzed by using the theory of SEM and gypsum hydration. The results showed that the strength of hemi-hydrated phosphogypsum backfilling material at 3 d,7 d,28 d was 3.0,3.8 and 3.8 MPa respectively,under additions of phosphogypsum 50%,the alkali activator 1. 5% and the slurry concentration 69%. It can meet the requirements of mining with backfilling in local mine. The dihydrate gypsum was generated after hydration of hemi-hydrated phosphogypsum. With the hydration reaction continued,the inner pores of the sample were gradually filled with the hydrated products. The generated dihydrate gypsum crystals form the structural skeleton of the cementitious material,which makes the filling material own a certain strength.
In order to investigate the possibility of applying the new cementitious material,hemi-hydrated phosphogypsum,into backfilling of mine,the optimum ratio of hemi-hydrated phosphogypsum filling material was determined by adjusting the proportion of different phosphogypsum,dosage of alkali activator and slurry concentration,and the property of the hemi-hydrated phosphogypsum filling body was analyzed by using the theory of SEM and gypsum hydration. The results showed that the strength of hemi-hydrated phosphogypsum backfilling material at 3 d,7 d,28 d was 3.0,3.8 and 3.8 MPa respectively,under additions of phosphogypsum 50%,the alkali activator 1. 5% and the slurry concentration 69%. It can meet the requirements of mining with backfilling in local mine. The dihydrate gypsum was generated after hydration of hemi-hydrated phosphogypsum. With the hydration reaction continued,the inner pores of the sample were gradually filled with the hydrated products. The generated dihydrate gypsum crystals form the structural skeleton of the cementitious material,which makes the filling material own a certain strength.
引文
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[3]肖柏林,杨志强,高谦.金川矿山磷石膏基新型充填胶凝材料的研制[J].矿业研究与开发,2015(1):21-24.Xiao Bolin,Yang Zhiqiang,Gao Qian.Development of new filling cementitious material of phosphogypsum in Jinchuan Mine[J].Mining Research and Development,2015(1):21-24.
[4]张光存,杨志强,高谦,等.利用磷石膏开发替代水泥的早强充填胶凝材料[J].金属矿山,2015(3):194-198.Zhang Guangcun,Yang Zhiqiang,Gao Qian,et al.Development of early strength filling cementing material with phosphogypsum as substitute of traditional cement[J].Metal Mine,2015(3):194-198.
[5]王新民,薛希龙,张钦礼,等.碎石和磷石膏联合胶结充填最佳配比及应用[J].中南大学学报:自然科学版,2015(10):3767-3773.Wang Xinmin,Xue Xilong,Zhang Qinli,et al.Optimum ratio and application of joint cemented backfill with crushed rock and phosphogypsum[J].Journal of Central South University:Science and Technology,2015(10):3767-3773.
[6]Li X,Du J,Gao L,et al.Immobilization of phosphogypsum for cemented paste backfill and its environmental effect[J].Journal of Cleaner Production,2017,156:137-146.
[7]Islam G M S,Chowdhury F H,Raihan M T,et al.Effect of phosphogypsum on the properties of portland cement☆[J].Procedia Engineering,2017,171:744-751.
[8]Nizevieiene D,Vaieiukyniene D,Vaitkevieius V,et al.Effects of waste fluid catalytic cracking on the properties of semi-hydrate phosphogypsum[J].Journal of Cleaner Production,2016,137:150-156.
[9]杨成军,杨敏,曹建新.半水/无水磷石膏复相胶凝材料水化硬化特性研究[J].非金属矿,2014(6):22-25.Yang Chengjun,Yang Min,Cao Jianxin.Study on hydration and hardening of duplex gypsum binder of hemihydrite phosphogypsum and anhydrite phosphogypsum[J].Non-Metallic Mines,2014(6):22-25.
[10]张秀勇,乔登攀.金川二矿区胶结充填料浆可泵性影响因素分析[J].金属矿山,2010(9):34-37.Zhang Xiuyong,Qiao Dengpan.Analysis of influencing factors on pumpability of cemented filling with in Jinchuan No.2 Mining Area[J].Metal Mine,2010(9):34-37.
[11]黄守兵,唐楷,缪建波.石膏砌块的发展现状与展望[J].四川建筑,2014(2):227-228.Huang Shoubing,Tang Kai,Miu Jianbo.The present situation and prospect of gypsum block[J].Sichuan Architecture,2014(2):227-228.
[12]李天富.石膏墙板成型设备自动开模控制系统研究[D].长沙:中南大学,2007.Li Tianfu.Research on Automatic Mold Opening Control System of Gypsum Wallboard Forming Equipment[D].Changsha:Central South University,2007.
[13]袁润章.胶凝材料学[M].武汉:武汉工业大学出版社,1996.Yuan Runzhang.Cementing Materials[M].Wuhan:Wuhan Industry University Press,1996.
[14]牟国栋.半水石膏水化过程中的物相变化研究[J].硅酸盐学报,2002,30(4):532-536.Mou Guodong.A study on the phase transformation of the bassanites during hydration[J].Journal of the Chinese Ceramic Society,2002,30(4):532-536.