固结粉充填胶凝材料粉体细度对充填体强度的影响
|
摘要
针对利用掺量超过75%水淬渣开发的充填胶凝材料(固结粉),探讨胶凝材料粉体细度对充填体强度的影响规律.粉体的比表面积测量结果表明,比表受温度影响显著,因此,固结粉细度需要比表结合采用+45μm筛余百分比作为细度指标进行其质量评价;粉体粉磨实验表明,最佳粉磨时间为0.5 h,增加粉磨时间将大幅降低粉磨效率.针对不同粉体细度进行了固结粉充填体强度试验,建立了水灰比与其强度的指数函数关系,表明了粉体细度越细,材料强度越高,在此基础上提出了固结粉相对活性指数η的概念,且η与粉体细度δ呈对数线性关系;最后在传统采用浓度、胶砂比等工业充填参数的强度模型基础上,建立了考虑粉体细度影响的充填体强度预测改进模型,通过验证结果显示,模型预测误差率在10%以内,满足充填工业运行的范围.
For the slag-gypsum binder(SGB) applied in mining backfill, which the quantity percentage of slag could be exceed 75%, this research studied the influencing rules of the SGB fineness on backfilling body strength. Firstly, tests on different milling duration of the SGB were carried out to study the SGB particle characteristics. It shows that surface area measurement is significantly affected by temperature, therefore, a new index δ which indicates cumulative particle percentage larger than 45 μm was used to evaluate the SGB fineness. And the best milling duration is 0.5 h, overtime milling contributes to a low efficiency drastically. Secondly, it carried out strength tests on the backfilling body with different SGB fineness δ, established an exponential function between strength and watercement ratio. To illustrate the result of "the finer SGB, the higher strength", a concept of relative activity index(RAI) η was presented,and the result shows that δ and η forms an inverse log-linear relationship. Finally, a modified strength predicting model which considers the impact of slurry concentration, cement ratio and SGB fineness was established, and the verification tests show that the predicting error is below 10%, which is completely within the industrial adaptation.
For the slag-gypsum binder(SGB) applied in mining backfill, which the quantity percentage of slag could be exceed 75%, this research studied the influencing rules of the SGB fineness on backfilling body strength. Firstly, tests on different milling duration of the SGB were carried out to study the SGB particle characteristics. It shows that surface area measurement is significantly affected by temperature, therefore, a new index δ which indicates cumulative particle percentage larger than 45 μm was used to evaluate the SGB fineness. And the best milling duration is 0.5 h, overtime milling contributes to a low efficiency drastically. Secondly, it carried out strength tests on the backfilling body with different SGB fineness δ, established an exponential function between strength and watercement ratio. To illustrate the result of "the finer SGB, the higher strength", a concept of relative activity index(RAI) η was presented,and the result shows that δ and η forms an inverse log-linear relationship. Finally, a modified strength predicting model which considers the impact of slurry concentration, cement ratio and SGB fineness was established, and the verification tests show that the predicting error is below 10%, which is completely within the industrial adaptation.
引文
1李夕兵,周健,王少锋,等.深部固体资源开采评述与探索.中国有色金属学报,2017,27:1236-1262
2 Ranjith P G,Zhao J,Ju M,et al.Opportunities and challenges in deep mining:A brief review.Engineering,2017,3:546-551
3李新平,汪斌,周桂龙.我国大陆实测深部地应力分布规律研究.岩石力学与工程学报,2012,31:2875-2880
4黄祖绍.创建绿色环保矿山、实现资源综合利用的探索与实践.中国矿业,2015,24(s2):76-80
5王新民,赵建文,张钦礼,等.露天转地下最佳开采模式.中南大学学报(自然科学版),2012,43:1434-1439
6 Ben-Awuah E,Richter O,Elkington T,et al.Strategic mining options optimization:Open pit mining,underground mining or both.Int J Min Sci Tech,2016,26:1065-1071
7李海英,任凤玉,周胜利,等.海南铁矿露天转地下三维探采结合方法.金属矿山,2016,45:24-27
8杨志强,王永前,高谦,等.金川镍矿废弃物在充填采矿中利用现状与展望.矿产综合利用,2017,3:22-28
9刘志祥,周士霖.充填体强度设计知识库模型.湖南科技大学学报(自然科学版),2012,27:7-12
10杨志强,高谦,王永前,等.金川全尾砂-棒磨砂混合充填料胶砂强度与料浆流变特性研究.岩石力学与工程学报,2014,33:3985-3991
11刘超,韩斌,孙伟,等.高寒地区废石破碎胶结充填体强度特性试验研究与工业应用.岩石力学与工程学报,2015,34:139-147
12史才军,王德辉,安晓鹏,等.基于多种性能要求的混凝土组成设计方法.硅酸盐学报,2018,46:230-238
13李彦坤,胡晓波,陈清己,等.球模型包裹法设计透水混凝土配合比.混凝土,2008,9:29-32
14 Bharatkumar B H,Narayanan R,Raghuprasad B K,et al.Mix proportioning of high performance concrete.Cement Concrete Compos,2001,23:71-80
15 Chen Q,Zhang Q,Fourie A,et al.Utilization of phosphogypsum and phosphate tailings for cemented paste backfill.J Environ Manage,2017,201:19-27
16杨志强,高谦,王永前,等.废石尾砂混合料浆流变特性及充填采场流动性试验.厦门大学学报(自然科学版),2017,56:294-299
17马伟东,古德生,王劼.用于充填采矿的高性能水淬渣胶凝材料.有色金属工程,2006,58:86-88
18 Cihangir F,Ercikdi B,Kesimal A,et al.Utilisation of alkali-activated blast furnace slag in paste backfill of high-sulphide mill tailings:Effect of binder type and dosage.Miner Eng,2012,30:33-43
19魏微,杨志强,高谦.全尾砂新型胶凝材料的胶结作用.建筑材料学报,2013,16:881-887
20张永娟,张雄.矿渣水泥活性研究.同济大学学报(自然科学版),2005,33:208-211
21王冲,张洪波,杨长辉,等.水泥细度对水泥水化及混凝土早期开裂影响.建筑材料学报,2013,16:853-857
2 Ranjith P G,Zhao J,Ju M,et al.Opportunities and challenges in deep mining:A brief review.Engineering,2017,3:546-551
3李新平,汪斌,周桂龙.我国大陆实测深部地应力分布规律研究.岩石力学与工程学报,2012,31:2875-2880
4黄祖绍.创建绿色环保矿山、实现资源综合利用的探索与实践.中国矿业,2015,24(s2):76-80
5王新民,赵建文,张钦礼,等.露天转地下最佳开采模式.中南大学学报(自然科学版),2012,43:1434-1439
6 Ben-Awuah E,Richter O,Elkington T,et al.Strategic mining options optimization:Open pit mining,underground mining or both.Int J Min Sci Tech,2016,26:1065-1071
7李海英,任凤玉,周胜利,等.海南铁矿露天转地下三维探采结合方法.金属矿山,2016,45:24-27
8杨志强,王永前,高谦,等.金川镍矿废弃物在充填采矿中利用现状与展望.矿产综合利用,2017,3:22-28
9刘志祥,周士霖.充填体强度设计知识库模型.湖南科技大学学报(自然科学版),2012,27:7-12
10杨志强,高谦,王永前,等.金川全尾砂-棒磨砂混合充填料胶砂强度与料浆流变特性研究.岩石力学与工程学报,2014,33:3985-3991
11刘超,韩斌,孙伟,等.高寒地区废石破碎胶结充填体强度特性试验研究与工业应用.岩石力学与工程学报,2015,34:139-147
12史才军,王德辉,安晓鹏,等.基于多种性能要求的混凝土组成设计方法.硅酸盐学报,2018,46:230-238
13李彦坤,胡晓波,陈清己,等.球模型包裹法设计透水混凝土配合比.混凝土,2008,9:29-32
14 Bharatkumar B H,Narayanan R,Raghuprasad B K,et al.Mix proportioning of high performance concrete.Cement Concrete Compos,2001,23:71-80
15 Chen Q,Zhang Q,Fourie A,et al.Utilization of phosphogypsum and phosphate tailings for cemented paste backfill.J Environ Manage,2017,201:19-27
16杨志强,高谦,王永前,等.废石尾砂混合料浆流变特性及充填采场流动性试验.厦门大学学报(自然科学版),2017,56:294-299
17马伟东,古德生,王劼.用于充填采矿的高性能水淬渣胶凝材料.有色金属工程,2006,58:86-88
18 Cihangir F,Ercikdi B,Kesimal A,et al.Utilisation of alkali-activated blast furnace slag in paste backfill of high-sulphide mill tailings:Effect of binder type and dosage.Miner Eng,2012,30:33-43
19魏微,杨志强,高谦.全尾砂新型胶凝材料的胶结作用.建筑材料学报,2013,16:881-887
20张永娟,张雄.矿渣水泥活性研究.同济大学学报(自然科学版),2005,33:208-211
21王冲,张洪波,杨长辉,等.水泥细度对水泥水化及混凝土早期开裂影响.建筑材料学报,2013,16:853-857