CN109265125A - 一种矿坑充填用环保型胶凝材料的制备方法 - Google Patents
一种矿坑充填用环保型胶凝材料的制备方法 Download PDFInfo
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Abstract
本发明涉及一种矿坑充填用环保型胶凝材料的制备方法,由粉煤灰、有色矿渣粉、赤泥、水泥、生石灰、石膏粉和火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到混合粉,所述混合粉与硅酸钠、发泡剂混合搅拌均匀既制成所述矿坑充填用环保型胶凝材料。本发明制得的胶凝材料消耗大量固废,节能环保;解决输送、离析、滤排水及填充体早期抗压强度不足的技术缺陷,具有含水量高,料浆不离析、不需脱水,可泵性好,料浆浓度可在30%~70%之间变化,充填后2h后抗压强度能达到3.3MPa,24h后抗压强度能达到5.9MPa,最终抗压强度能达到11.9MPa。
Description
技术领域
本发明涉及建筑材料技术领域,尤其涉及一种矿坑充填用环保型胶凝材料的制备方法。
背景技术
随着工业经济和城市建设的发展,各种矿产资源必不可少。而采矿留下的大量矿坑、巷道和采空区也会随着时间的推移发生严重的地质灾害和环境污染,如滑坡、开裂、地表沉陷、水源流失,耕地、山林、房屋毁损、地下水污染以及对人畜等生命财产的危害等。
而目前在用于修复矿坑的方法通常是用水泥和采矿废渣混合灌注,水泥作为矿山充填胶凝材料的最大问题是离析和泌水量大。矿山充填普遍采用地面搅拌制浆,管道自流输送技术,即利用垂直管道压差势能,通过水力作用将充填料输送到充填区。水作为传递介质,其用量远大于混凝土或砂浆的用水量。因此,水泥作为矿坑胶凝材料存在如下缺陷:1)、多余水必须迅速排出,以免影响固化和后期充填,因而一般要求采用排水效果好的脱泥分级尾砂填充;2)、水在流动排泄过程中会引起料浆的离析和分层,使得充填体固化强度大为降低,为减少离析和排水量,就需要提高料浆浓度,但这由增加了输送难度,甚至无法自流输送。
发明内容
本发明针对现有技术存在的不足,提供了一种矿坑充填用环保型胶凝材料的制备方法,具体技术方案如下:
一种矿坑充填用环保型胶凝材料的制备方法,由粉煤灰、有色矿渣粉、赤泥、水泥、生石灰、石膏粉和火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到混合粉,所述混合粉与硅酸钠、发泡剂混合搅拌均匀既制成所述矿坑充填用环保型胶凝材料。
作为上述技术方案的改进,所述粉煤灰、有色矿渣粉、赤泥、水泥、生石灰、石膏粉、火山石粉、硅酸钠、发泡剂的质量比为(50~60):(10~20):(15~25):(60~70):(20~30):(10~15):(30~40):(10~15):(0.001~0.002)。
作为上述技术方案的改进,所述煅烧温度为500~600℃。
作为上述技术方案的改进,所述混合粉的粒径为小于或等于0.25mm。
作为上述技术方案的改进,所述发泡剂为铝粉或碳酸氢盐。
作为上述技术方案的改进,所述有色矿渣粉的比表面积大于或等于350m2/kg2。
作为上述技术方案的改进,所述火山石粉的比表面积大于或等于500m2/kg2。
作为上述技术方案的改进,所述赤泥的含水量小于或等于0.3%。
本发明的有益效果:本发明制得的胶凝材料消耗大量粉煤灰、有色矿渣粉、赤泥等固废,节能环保;能够克服水泥胶凝材料的不足,解决输送、离析、滤排水以及填充体早期抗压强度不足的技术缺陷,具有含水量高,料浆不离析、不需脱水,可泵性好,料浆浓度可在30%~70%之间变化,充填后2h后抗压强度能达到3.3MPa,24h后抗压强度能达到5.9MPa,最终抗压强度能达到11.9MPa。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
实施例1
将50Kg粉煤灰、10Kg比表面积大于或等于350m2/kg2的有色矿渣粉、15Kg含水量小于或等于0.3%的赤泥、60Kg水泥、20Kg生石灰、10Kg石膏粉和30Kg比表面积大于或等于500m2/kg2的火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到粒径为小于或等于0.25mm的混合粉,煅烧温度为500~530℃,所述混合粉与10Kg硅酸钠、0.001Kg发泡剂混合搅拌均匀既制得成品A。所述发泡剂为碳酸氢盐。
成品A与尾砂加水搅拌混合后放料,料浆浓度可在30%~50%之间变化,充填后2h抗压强度超过2.5~3.0MPa,24h后抗压强度达到4.7~5.6MPa,最终抗压强度能达到9.1~10.5MPa。
实施例2
将56Kg粉煤灰、16Kg比表面积大于或等于350m2/kg2的有色矿渣粉、20Kg含水量小于或等于0.3%的赤泥、66Kg水泥、25Kg生石灰、13Kg石膏粉和36Kg比表面积大于或等于500m2/kg2的火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到粒径为小于或等于0.25mm的混合粉,煅烧温度为530~560℃,所述混合粉与12Kg硅酸钠、0.0017Kg发泡剂混合搅拌均匀既制得成品B。所述发泡剂为铝粉。
成品B与尾砂加水搅拌混合后放料,料浆浓度可在40%~60%之间变化,充填后2h抗压强度超过2.6~3.1MPa,24h后抗压强度达到4.7~5.8MPa,最终抗压强度能达到10.3~11.9MPa。
实施例3
将60Kg粉煤灰、20Kg比表面积大于或等于350m2/kg2的有色矿渣粉、25Kg含水量小于或等于0.3%的赤泥、70Kg水泥、30Kg生石灰、15Kg石膏粉和40Kg比表面积大于或等于500m2/kg2的火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到粒径为小于或等于0.25mm的混合粉,煅烧温度为560~600℃,所述混合粉与15Kg硅酸钠、0.002Kg发泡剂混合搅拌均匀既制得成品C。所述发泡剂为铝粉。
成品C与尾砂加水搅拌混合后放料,料浆浓度可在30%~70%之间变化,充填后2h抗压强度不超过2.7~3.3MPa,24h后抗压强度达到4.9~5.9MPa,最终抗压强度能达到9.7~11.1MPa。
对照试验
将硅酸盐水泥与尾砂加水搅拌混合后放料,料浆浓度可在30%~40%之间变化,充填后2h抗压强度不超过2MPa,24h后抗压强度不超过4MPa,最终抗压强度不超过6MPa。
在上述实施例中,采用粉煤灰、有色矿渣粉、赤泥、生石灰、石膏粉和火山石粉与水泥混合制成的胶凝材料,相对于传统的硅酸盐水泥,本发明所述胶凝材料大量消耗粉煤灰、有色矿渣粉、赤泥等固废,节能环保。通过添加赤泥、水泥、生石灰、石膏粉并再经过煅烧球磨使得胶凝材料凝结性好,有效降低离析和分层,使得固化后的抗压强度显著提高。由于火山石粉为多孔材料,表面积大,这有利于提高料浆的排水,从而使得料浆浓度可在30%~70%之间变化,输送难度降低,有利于自流输送。
其中,铝粉在碱性环境下与水碱反应产生氢气,在水泥浆中加入石灰可以发泡,发泡的料浆有利于自流输送。生石灰与水反应生成氢氧化钙并放出大量的热,发泡产生的泡沫能够有效堵住料浆中粒料之间的微小缝隙,从而具有锁水、保水效果;待泡沫消除后,料浆中粒料之间的多孔缝隙,有利于排水;在起初,泡沫包裹,使得料浆在生石灰与水产生的热量的蒸煮下,可对料浆进行加速养护。随着排水的进行,料浆中粒料之间的孔隙会暴露的越来越多,这有利于空气中的二氧化碳进入并与氢氧化钙反应生成碳酸钙,该碳酸钙会与石膏、硅酸钠结合并填充孔隙,从而有利于提高最终填充体的抗压强度。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (8)
1.一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:由粉煤灰、有色矿渣粉、赤泥、水泥、生石灰、石膏粉和火山石粉混合经过球磨成胚粉,胚粉经过煅烧、球磨后得到混合粉,所述混合粉与硅酸钠、发泡剂混合搅拌均匀既制成所述矿坑充填用环保型胶凝材料。
2.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述粉煤灰、有色矿渣粉、赤泥、水泥、生石灰、石膏粉、火山石粉、硅酸钠、发泡剂的质量比为(50~60):(10~20):(15~25):(60~70):(20~30):(10~15):(30~40):(10~15):(0.001~0.002)。
3.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述煅烧温度为500~600℃。
4.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述混合粉的粒径为小于或等于0.25mm。
5.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述发泡剂为铝粉或碳酸氢盐。
6.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述有色矿渣粉的比表面积大于或等于350m2/kg2。
7.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述火山石粉的比表面积大于或等于500m2/kg2。
8.根据权利要求1所述的一种矿坑充填用环保型胶凝材料的制备方法,其特征在于:所述赤泥的含水量小于或等于0.3%。
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