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Improvement on Pozzolanic Reactivity of Inert Solid waste by Integrated Thermal and Chemical Activation
Li Yu 1 * #,Liu Xiaoming 2,Yao yuan 3
1.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083
2.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083
3. School of Engineering and Computer Science, University of the Pacific, Stockton, CA 95211, USA
*Correspondence author
#Submitted by
Subject:
Funding: Research Fund for the Doctoral Program of Higher Education of China(No.20100006120010), the National Natural Science Foundation of China (No.NO. 51104008)
Opened online: 7 June 2013
Accepted by: none
Citation: Li Yu,Liu Xiaoming,Yao yuan.Improvement on Pozzolanic Reactivity of Inert Solid waste by Integrated Thermal and Chemical Activation[OL]. [ 7 June 2013] http://en.paper.edu.cn/en_releasepaper/content/4543036
 
 
Coal gangue, mainly comprised of quartz and feldspar, is a kink of typical inert solid waste. In order to effectively utilize coal gangue, coal gangue was converted into ecological cement by activating it at 800 ℃ with an integrated thermal and chemical activation method in this paper. XRD, NMR techniques and thermodynamics analysis indicates that improved reactivity for coal gangue contributes to the generated amorphous materials during both thermal and chemical activation process. In the chemical activation process, amorphous materials comprised of Q3(0Al), Q3(1Al) and Q0 units formed from parts of inert aluminosilicate minerals (quartz and K-feldspar). CaO+CaSO4 is the most effective corrosion additive, and each probably corrosion reactions between coal gangue and CaSO4+CaO could take place but keep in a non-equilibrium process from 900K to 1200K. Industrial test on a clinker production line shows that the integrated activation method could be applied into industrial production. Cement containing 56% of activated coal gangue had been successfully produced and used in road pavement test with 28-days concrete compressive strength of 35.9MPa. Compared with clinker producing process, energy consumption for producing per ton activated coal gangue could save 90.7kgce mainly due to its low calcination temperature at 800℃, calorific value of about 1600Kcal/kg and less electricity consumption on grinding coal.
Keywords:Coal gangue; Amorphous materials; Pozzolanic reactivity
 
 
 

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