Sodium silicate effect on setting properties, strength behavior and microstructure of cemented coal fly ash backfill

2021 ◽  
Vol 384 ◽  
pp. 17-28
Author(s):  
Ibrahim Cavusoglu ◽  
Erol Yilmaz ◽  
Ali Osman Yilmaz
Keyword(s):  
Fly Ash ◽  
Sodium Silicate ◽  
Coal Fly Ash ◽  
Strength Behavior

Non-hydrothermal synthesis of mesoporous materials using sodium silicate from coal fly ash

2007 ◽  
Vol 101 (2-3) ◽  
pp. 344-351 ◽  
Author(s):  
M. Halina ◽  
S. Ramesh ◽  
M.A. Yarmo ◽  
R.A. Kamarudin
Keyword(s):  
Fly Ash ◽  
Hydrothermal Synthesis ◽  
Sodium Silicate ◽  
Mesoporous Materials ◽  
Coal Fly Ash

4A-Molecular Sieve Synthesis by Microwave Heating with Silicon and Aluminum Materials Produced from the Coal Fly Ash

2011 ◽  
Vol 675-677 ◽  
pp. 219-222 ◽  
Author(s):  
Guang Hui Bai ◽  
Peng Cheng Li ◽  
Peng Xu ◽  
Shuang Li Chen
Keyword(s):  
Fly Ash ◽  
Pore Size ◽  
Sodium Silicate ◽  
Molecular Sieve ◽  
Coal Fly Ash ◽  
Sodium Aluminate ◽  
Raw Material ◽  
Crystallization Time ◽  
Microwave Technology ◽  
Practical Applications

A new method, using sodium silicate and sodium aluminate synthesize 4A-molecular sieve, was developed by using microwave technology. The sodium silicate was a high modulus liquor by-product of nano-silica production from coal fly ash. Meanwhile, the sodium aluminate was a process by-product of alumina extraction from coal fly ash. Reaction mixture composition was defined as follow:SiO2/Al2O3 ratio in 2.0, Na2O/SiO2 ratio in 1.5, and H2O/Na2O ratio in 65. The gelation process was completed in 1 hr. Microwave crystallization power was (800w) 30%. Microwave crystallization period can last 25 mins. The 4A-molecular sieve was obtained by collecting crystals from the reaction mixture through filtration after washing with water to pH 11-12 and drying inside isotherm oven. The calcium exchange capacity and effective pore size of the product were 316mg/g and 0.4nm respectively. Over 90% of surface pore size reached in sizes of less than or equal to 8μm. Purity of 4A-molecular sieve up to 99%. This method significantly reduced the raw material costs for sodium silicate and sodium aluminate. In addition, the adoption of microwave technology also lowered the energy usage and shortened crystallization time. All these contributed final low costs of 4A-molecular sieve product, which made it possible for many practical applications.

Preparation of Sodium Silicate Solutions and Silica Nanoparticles from South African Coal Fly Ash

2019 ◽  
Author(s):  
Mathibela E. Aphane ◽  
Frédéric J. Doucet ◽  
Richard A. Kruger ◽  
Leslie Petrik ◽  
Elizabet M. van der Merwe
Keyword(s):  
Fly Ash ◽  
Silica Nanoparticles ◽  
South African ◽  
Sodium Silicate ◽  
Coal Fly Ash

scholarly journals Study on the extracted process of mullite from coal fly ash by-product sodium silicate

2019 ◽  
Vol 127 (2) ◽  
pp. 90-97 ◽  
Author(s):  
Saishengtai GAO ◽  
Yongfeng ZHANG ◽  
Yinmin ZHANG ◽  
Shaobo SUN ◽  
Minjian WANG
Keyword(s):  
Fly Ash ◽  
Sodium Silicate ◽  
Coal Fly Ash

The effect of sodium silicate and sodium hydroxide on the strength of aggregates made from coal fly ash using the geopolymerisation method

2010 ◽  
Vol 7 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Hamzah Fansuri ◽  
Didik Prasetyoko ◽  
Zezhi Zhang ◽  
Dongke Zhang
Keyword(s):  
Fly Ash ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Coal Fly Ash

Development of Geopolymer from Fly Ash and Metallurgical Slag

2015 ◽  
Vol 1123 ◽  
pp. 127-130
Author(s):  
Tjokorde Walmiki Samadhia ◽  
Nurhidayati Muan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Silicate ◽  
Ordinary Portland Cement ◽  
Coal Fly Ash ◽  
Three Dimensional ◽  
Metallurgical Slag ◽  
Waste Materials ◽  
Mass Ratio ◽  
Uniaxial Load

Geopolymers, which areinorganic polymers consisting largely of three-dimensional Al-Si-O networkformed by reactions between aluminosilicate solids and concentrated alkalisolutions, are gaining recognition as environmentally friendly engineeringmaterials. As a replacement for ordinary Portland cement (OPC), geopolymerconsumes much less energy to produce, and may be synthesized from various solidinorganic waste materials. This work describes the synthesis of geopolymerswhich combines two waste materials as aluminosilicate precursors: an ASTM ClassC coal fly ash from the Paiton powerplant, and Fe-rich metallurgical slag fromKratakau Steel. To study the effects of the reactant mixture composition, asimplex centroid experiment is undertaken with fly ash and slag as its majorcomponents, and level of addition of sodium silicate as the independentvariable. The highest slag to ash mass ratio is set at 50%. The solidaluminosilicates and sodium silicate are mixed with 10 M KOH solution at a massratio of 2.8. The mixture is processed in a planetary mixer to form a smoothpaste, which is then cast into specimens for the measurement of compressivestrength in a universal uniaxial load tester after a 1-week period of curing atroom temperature. The measured compressive strengths of all geopolymer pastesamples are lower than that of OPC, anddecreases with increasing slag proportion. Addition of Sodium silicateincreases the strength due to decreased porosity. Despite the highertheoretical reactivity of the slag compared to the Paiton fly ash, estimatedfrom their degrees of network depolymerization, the addition of slag reducesthe geopolymer mortar compressive strength. It is hypothesized that therelatively coarse size of the slag particles offsets its higher reactivity.

UTILIZATION OF COAL FLY ASH FROM POWER PLANTS - I. ASH CHARACTERIZATION

2008 ◽  
Vol 7 (3) ◽  
pp. 289-293 ◽  
Author(s):  
Maria Harja ◽  
Marinela Barbuta ◽  
Lacramioara Rusu ◽  
Nicolae Apostolescu
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Coal Fly Ash
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