摘要
为研究铜镍冶炼渣制备充填材料实现大规模消纳利用的可行性,将冶炼渣粉磨至不同的细度,开展了基于不同粉磨时间、冶炼渣掺量及激发剂掺量条件下的正交试验,制备充填试件,研究各因素对充填体单轴抗压强度的影响规律,并采用SEM图谱对其水化产物进行分析。研究表明:采用铜镍冶炼渣制备充填胶凝材料的最佳粉磨时间为50 min,对应的D(0.1)、D(0.5)和D(0.9)分别为4μm、29μm和120μm。铜镍冶炼渣在水泥—戈壁集料体系中能够发生火山灰反应,对胶结充填体后期强度有一定的提升作用。通过分析SEM图谱进一步发现,铜镍冶炼渣的掺入能够促进体系后期钙矾石和水化硅酸钙(C-S-H)的生成。正交试验结果表明:铜镍冶炼渣—水泥比例为2∶8,激发剂掺量为4%,胶结充填体单轴抗压强度最高。
The copper nickel smelting slag is mainly the pyrometallurgical smelting slag discharged from the copper nickel ore in the smelting process.Its main elements are iron and silicon,with contents of about 40%and 30%respectively.Generally,the disposal of copper and nickel smelting slag is mainly stacking and landfill,which wastes land resources and pollutes the environment at the same time,so the comprehensive utilization rate is low.It has been shown that the copper nickel smelting slag has certain pozzolanic activity,and it is feasible to prepare filling cementitious materials with it.In this paper,copper and nickel smelting slag were ground to different fineness,cement mixed with smelting slag was used as cementitious material,Gobi aggregate was used as aggregate,and orthogonal test was carried out to prepare cementitious filler based on different grinding time,slag content and activator content of smelting slag.By measuring the uniaxial compressive strength of cemented backfill at different ages,the influence rule and mechanism of various factors on the compressive strength of cemented backfill were studied,and the final hydration products were qualitatively analyzed by SEM.The results show that with the increase of grinding time,the uniaxial compressive strength of cemented backfill increases at first and then decreases.The optimal grinding time is 50 min,corresponding to D(0.1),D(0.5)and D(0.9)of 4μm,29μm and 120μm respectively.The addition of smelting slag reduces the uniaxial compressive strength of cemented backfill,but the reduction of compressive strength of backfill in the later period of maintenance is lower than that in the early period.The pozzolanic reaction of copper nickel smelting slag in cement Gobi aggregate system can promote the compressive strength of cemented backfill.SEM images show that the addition of Cu-Ni slag can promote the formation of ettringite and calcium silicate hydrate(C-S-H).The influence of activator on the uniaxial compressive strength of cemented backfill is not obvious.T
作者
张雷
郭利杰
李文臣
ZHANG Lei;GUO Lijie;LI Wenchen(BGRIMM Technology Group,Beijing 100160,China;National Centre for International Research on Green Metal Mining,Beijing 102628,China)
出处
《黄金科学技术》
CSCD
2020年第5期669-677,共9页
Gold Science and Technology
基金
国家重点研发计划项目“基于有色冶炼渣的绿色充填胶凝材料制备及其性能合作研究”(编号:2017YFE0107000)资助。
关键词
铜镍冶炼渣
碱激发
机械粉磨
正交试验
胶结充填
戈壁集料
copper-nickel smelting slag
alkali activation
mechanical grinding
orthogonal test
cemented filling
Gobi aggregate
