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Experiment Study on Solidifying Characteristic of Fly Ash-Desulphogypsum

Author: WangFangQun
Tutor: YuanYongTao
School: North China Electric Power University (Hebei)
Course: Environmental Engineering
Keywords: fly ash desulphogypsum solidification exciting agents cementitious material
CLC: X701.3
Type: Master's thesis
Year: 2004
Downloads: 456
Quote: 6
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Abstract


This thesis investigates the solidifying reactions between fly ash and desulphogypsum, two major solid wastes in coal-fired power plants, while being naturally cured in the air. Firstly, by considerable experiments, the paper disclosed the strength laws of fly ash-desulphogypsum cementitious material when each exciter acts on the system alone. On the basis of this, by orthogonal experiment, we found out primary and secondary order of curing agents, and obtained the optimum composition of fly ash-desulphogypsum binder as follows: flyash/desulphogypsum=3:2, and additional exciter such as 1% NaOH, 1%K2SO4, 1% lime, PH=4 HCl solution. Besides, the solidifying mechanisms of exciting agents and rule of hydration and hardening of cementitious material were deeply analyzed and discussed.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Desulfurization and desulfurization
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