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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (5): 678-687.doi: 10.11872/j.issn.1005-2518.2020.05.109

• 绿色胶凝材料专栏 • 上一篇    下一篇

矿物掺合料改性铜镍渣胶凝材料的性能研究

张婷婷1(),周子钰1,郭利杰2,武震林1(),韩俊南1   

  1. 1.大连理工大学,辽宁 大连 116024
    2.矿冶科技集团有限公司,北京 100160
  • 收稿日期:2020-06-13 修回日期:2020-09-02 出版日期:2020-10-31 发布日期:2020-11-05
  • 通讯作者: 武震林 E-mail:tingtingzhang@dlut.edu.cn;zhenlinwu@dlut.edu.cn
  • 作者简介:张婷婷(1983-),女,山东平度人,副教授,从事低碳胶凝材料研究工作。tingtingzhang@dlut.edu.cn
  • 基金资助:
    国家重点研发计划项目“基于有色冶炼渣的绿色充填凝胶材料制备及性能合作研究”(2017YFE0107000)

Study on Properties of Mineral Admixture Modified Copper-Nickel Slag Cementitious Materials

Tingting ZHANG1(),Ziyu ZHOU1,Lijie GUO2,Zhenlin WU1(),Junnan HAN1   

  1. 1.Dalian University of Technology,Dalian 116024,Liaoning,China
    2.BGRIMM Technology Group,Beijing 110160,China
  • Received:2020-06-13 Revised:2020-09-02 Online:2020-10-31 Published:2020-11-05
  • Contact: Zhenlin WU E-mail:tingtingzhang@dlut.edu.cn;zhenlinwu@dlut.edu.cn

摘要:

随着有色金属产业的迅猛发展,铜镍冶炼渣大面积堆放造成的环境污染问题也日益突出,研究以铜镍渣为原料的建筑胶凝材料具有“利废为宝”的现实意义。然而,前期工作表明铜镍渣胶凝材料在单独碱激发条件下的胶凝性能和力学性能均不理想。本研究旨在利用2种矿物掺合料来加速激发铜镍渣胶凝材料以提高其力学性能,并利用XRD、FTIR和SEM等测试方法来分析掺合料的改性效果和改性机理。结果表明:粉煤灰和矿渣粉作为掺合料均能提高NaOH激发下铜镍渣胶凝材料的力学性能,其中矿渣粉的改性效果更为显著。微观结构分析表明:矿物掺合料能够弥补铜镍渣中钙源不足的缺陷,生成更多C-S-H凝胶的同时也起到了加速激发的效果。

关键词: 铜镍渣, 碱激发, 矿物掺合料, 加速激发, 微观结构, C-S-H凝胶

Abstract:

With the further expansion of demand in the non-ferrous metal industry,the environmental pollution caused by large-scale stacking of copper-nickel smelting slag is becoming more and more serious.There are various forms of secondary utilization of copper-nickel slag in worldwide,including conventional methods such as metal extraction,glass-ceramics generation and ceramics,all of which have the disadvantage of low comprehensive utilization.Therefore,it is of great practical significance to study the construction cementitious materials using copper-nickel slag as the raw material in the secondary utilization of industrial waste.In the preliminary experiment,our research group used NaOH as the alkali activator to conduct the ion dissolution characteristics research of copper-nickel slag and the mechanical properties test of copper-nickel slag cementitious materials.The preliminary results show that the gelation and mechanical properties of copper-nickel slag materials are not ideal under the condition of a single alkali activator,and it is difficult to meet the actual engineering application standards.Therefore,this paper aims to use mineral admixtures to accelerate the activation of modified copper-nickel slag cementitious materials to improve their mechanical properties.After comprehensive consideration,we selected the slag powder and fly ash,which are also industrial waste,as the modifier.The admixture was mixed into the copper-nickel slag separately through the external mixing method to form two experimental groups.The final mixture ratio and water-cement ratio are adjusted and determined according to preliminary experiments.After curing,the compressive strength of each group of samples was tested by a universal testing machine.Then the product composition and modification mechanism of the experimental samples at various ages were analyzed by XRD,FTIR,SEM and other testing methods,and the performance improvement effect of different mineral admixtures was evaluated.The results show that both fly ash and slag powder as admixtures can improve the mechanical properties of copper-nickel slag cementitious materials of various ages by NaOH-activation,and the modification effect of high-doped slag powder is better.The modified cementitious material can basically replace ordinary Portland cement.According to the analysis of sample product and microstructure,the addition of mineral admixtures makes up for the deficiency of insufficient calcium source in the copper-nickel slag,which makes the polymerization reaction under alkaline activation more intense.In addition,the amount of C-S-H gel produced in the samples of the modified experimental group increased significantly,and the amount of iron gel produced decreased,showing a good acceleration excitation effect at all ages.

Key words: copper-nickel slag, alkali activator, mineral admixtures, accelerated activation, microstructure, C-S-H gel

中图分类号: 

  • TU526

表1

铜镍渣化学成分"

化学成分质量分数化学成分质量分数
MgO6.21Fe2O356.45
CaO1.25Al2O31.47
SiO230.68其他3.94

图1

铜镍渣XRD谱图"

表2

粉煤灰和矿渣粉的化学成分"

掺合料种类化学成分
CaOMgOSiO2Al2O3Fe2O3Ka2O其他
粉煤灰14.653.0251.4417.623.121.019.14
矿渣粉39.989.5029.7614.120.630.585.43

图2

粉煤灰和矿渣粉的XRD图谱"

图3

NaOH掺量对CNSCMs抗压强度的影响"

表3

掺入粉煤灰混合料配比"

样品编号NaOH含量/%铜镍渣含量/g粉煤灰含量/g水灰比
F17225250.21
F27200500.21
F37175750.21
F471501000.21
F571251250.21

图4

粉煤灰掺量对CNSCMs抗压强度的影响"

图5

粉煤灰改性CNSCMs的XRD图谱1?10%粉煤灰;2?20%粉煤灰;3?30%粉煤灰;4?40%粉煤灰;5?50%粉煤灰"

图6

粉煤灰改性CNSCMs的FTIR图谱1?10%粉煤灰;2?20%粉煤灰;3?30%粉煤灰;4?40%粉煤灰;5?50%粉煤灰"

图7

粉煤灰改性CNSCMs的SEM图"

表4

掺入矿渣粉混合料配比"

样品编号NaOH含量/%铜镍渣含量/g矿渣粉含量/g水灰比
S13225250.21
S23200500.21
S33175750.21
S431501000.21
S531251250.21

图8

矿渣粉掺量对CNSCMs抗压强度的影响"

图9

矿渣粉改性CNSCMs的XRD图谱1?10%矿粉;2?20%矿粉;3?30%矿粉;4?40%矿粉;5?50%矿粉"

图10

矿渣粉改性CNSCMs的FTIR图谱1?10%矿粉;2?20%矿粉;3?30%矿粉;4?40%矿粉;5?50%矿粉"

图11

矿渣粉改性CNSCMs的SEM图"

图12

矿渣粉改性CNSCMs的EDS 图谱(A 处)"

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