Coal Fly Ash-derived Mesoporous Calcium-Silicate Material (MCSM) for the Efficient Removal of Cd(II), Cr(III), Ni(II) and Pb(II) from Acidic Solutions

In this study, utilization of coal fly ash with higher loss on ignition (LOI) for geopolymer mortar was investigated. The fly ash with approximately 9% of LOI was compared with Class F fly ash. Relationship between heat curing condition and strength was clarified. As the results, although compressive strength of geopolymer mortar with higher LOI was 30-50% smaller, it was available for geopolymer mortar as an alumina silicate material. The higher temperature and the longer period for initial curing, the higher strength was obtained. In order to decrease drying shrinkage, the higher temperature and the longer period for heat curing were required.

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Characterization of high-alumina coal fly ash based silicate material and its adsorption performance on volatile organic compound elimination

Korean Journal of Chemical Engineering ◽

10.1007/s11814-014-0264-3 ◽

2015 ◽

Vol 32 (3) ◽

pp. 436-445 ◽

Cited By ~ 10

Author(s):

Guojun Yuan ◽

Jianbin Zhang ◽

Yongfeng Zhang ◽

Yinan Yan ◽

Xinxin Ju ◽

...

Keyword(s):

Fly Ash ◽

Organic Compound ◽

Volatile Organic Compound ◽

Coal Fly Ash ◽

High Alumina ◽

Silicate Material ◽

Adsorption Performance ◽

Volatile Organic

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Preparation of Xonotlite Nano-Fibres Using the Silica Source from Coal Fly Ash and Ca(OH)2

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.633.7 ◽

2014 ◽

Vol 633 ◽

pp. 7-10 ◽

Cited By ~ 5

Author(s):

Jing Yang ◽

Xin Zhang ◽

Hong Wen Ma ◽

Ming Wei Wang ◽

Han Wu

Keyword(s):

Fly Ash ◽

Calcium Silicate ◽

Coal Fly Ash ◽

High Alumina ◽

Thermal Synthesis ◽

Hydrated Calcium Silicate ◽

Hydrothermal Temperature ◽

Silica Source ◽

Naoh Solution ◽

Hydrated Calcium

Extracting aluminum oxide from high-alumina coal fly ash are significant to make up for the inadequacy of bauxite resource in China. How to comprehensively utilize silica components in coal fly ash is a key technical question in industrialization for extracting of alumina from coal fly ash. Desilication of coal fly ash (CFA) and preparation of xonotlite were studied using the silica-rich solution from the CFA as silica source and calcium oxide as calcium source respectively. The CFA is from a power plant at Shizuishan city in Ningxia, China. Xonotlite was successfully prepared by a series processes including predesilication, hydro-thermal synthesis. The experimental results indicated that SiO2in the coal fly ash changed into NaSiO3after the coal fly ash was treated by desilication using NaOH solution. Hydrated calcium silicate was obtained from the reaction of the solutions produced by desilication and Ca (OH)2at the condition of Ca/Si (mol)=1, T=160°Cand t=1h. Xonotlite was synthesized by the hydrated calcium silicate using the hydrothermal temperature of 260°C for 2 hours. Keywords: Coal Fly Ash, Pre-desilication, alkali Hydrothermally-treated, Xonotlite nanofibres

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