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Fibers 2017, 5(4), 47; https://doi.org/10.3390/fib5040047

Enhancement Experiment on Cementitious Activity of Copper-Mine Tailings in a Geopolymer System

1,2,†
,
1,†
,
1,†
,
1,2,* and 1,*
1
State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2
City College of Science and Technology, Chongqing University, Chongqing 400044, China
These authors contributed equally to the work.
*
Authors to whom correspondence should be addressed.
Received: 21 September 2017 / Revised: 7 December 2017 / Accepted: 14 December 2017 / Published: 15 December 2017
(This article belongs to the Special Issue Geopolymer Based Fiber Reinforced Composites)
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Abstract

Copper-mine tailings are the residual products after the extraction of precious copper metal from copper ores, and their storage can create numerous environmental problems. Many researchers have used copper-mine tailings for the preparation of geopolymers. This paper studies the enhancement of the cementitious activity of copper-mine tailings in geopolymer systems. First, copper-mine tailings are activated through mechanical grinding activation. Then, the mechanically activated copper-mine tailings are further processed through thermal activation and alkaline-roasting activation. The cementitious activity index of copper-mine tailings is characterized through the degree of leaching concentration of Si and Al. It was observed that the Si and Al leaching concentration of mechanically activated tailings was increased by 26.03% and 93.33%, respectively. The concentration of Si and Al was increased by 54.19% and 119.92%, respectively. For alkaline-roasting activation, roasting time, temperature and the mass ratio of copper-mine tailings to NaOH (C/N ratio) were evaluated through orthogonal tests, and the best condition for activation was 120 min at 600 °C with a C/N ratio of 5:1. In this study, scanning electron microscopy (SEM), X-ray diffraction (XRD) and infra-red (IR) analysis show that mechanical, thermal and alkaline-roasting activation could be used to improve the cementitious activity index of copper-mine tailings. View Full-Text
Keywords: copper-mine tailings; mechanical activation; thermal activation; alkaline-roasting activation; alkali leaching copper-mine tailings; mechanical activation; thermal activation; alkaline-roasting activation; alkali leaching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yu, L.; Zhang, Z.; Huang, X.; Jiao, B.; Li, D. Enhancement Experiment on Cementitious Activity of Copper-Mine Tailings in a Geopolymer System. Fibers 2017, 5, 47.

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