scholarly journals Effect of Na2O/SiO2 mole ratio on the crystal type of zeolite synthesized from coal fly ash

2003 ◽  
Vol 68 (6) ◽  
pp. 471-478 ◽  
Author(s):  
Dusica Vucinic ◽  
Igor Miljanovic ◽  
Aleksandra Rosic ◽  
Predrag Lazic
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Coal Fly Ash ◽  
Zeolite Synthesis ◽  
Crystal Type ◽  
Modified Fly Ash ◽  
Zeolitic Materials

Coal fly ash was modified to zeolitic materials by hydrothermal treatment at 90 ?C. The zeolite synthesis was studied as a function of the mole ratio of Na2O/SiO2 in the reaction mixtures. The results showed that NaP1 zeolite is obtained when the Na2O/SiO2 mole ratio was 0.7. Hydroxysodalite is the dominant zeolite phase in modified fly ash treated with a higher Na2O concentration solution (Na2O/SiO2 = 1.3). The IR and XRD methods were used to determine the phases present in the starting sample and in the zeolitic materials.

Utilization of incineration fly ash from biomass power plants for zeolite synthesis from coal fly ash by microwave hydrothermal treatment

2018 ◽  
Vol 29 (3) ◽  
pp. 450-456 ◽  
Author(s):  
Tomonori Fukasawa ◽  
Akira Horigome ◽  
Achmad Dwitama Karisma ◽  
Norio Maeda ◽  
An-Ni Huang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Zeolite Synthesis ◽  
Microwave Hydrothermal ◽  
Biomass Power Plants

The Influence of Modification Conditions on Activation of Coal Fly Ash

2013 ◽  
Vol 813 ◽  
pp. 471-474
Author(s):  
Hui Ping Song ◽  
Fang Bin Xue ◽  
Fang Qin Cheng ◽  
Yan Xia Guo ◽  
Huai Gang Cheng
Keyword(s):  
Wastewater Treatment ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Hydrothermal Treatment ◽  
Theoretical Basis ◽  
Coal Fly Ash ◽  
Modified Fly Ash

The sodium hydroxide calcination-hydrothermal treatment was used to modify the fly ash in this paper. The mount of alkali, the ratio of solid and liquid and the temperature of calcination were respectively studied in the process of modification. The best modified condition is that the ratio of sodium hydroxide and fly ash was 0.4:1, the ratio of solid and liquid was 1:1, and the temperature of calcination was 400°C. The zeolite-like structure was generated after modification. The modified fly ash in this paper was cheap and effective, providing a theoretical basis for wastewater treatment.

Recycling of Waste Coal Fly Ash: Synthesis of Zeolite-Like Minerals from Residue Yielded by Extraction of Aluminum Ions

2006 ◽  
Vol 510-511 ◽  
pp. 610-613
Author(s):  
M.S. Ryu ◽  
H.G. Sin ◽  
S.H. Park ◽  
Seog Young Yoon ◽  
Ron Stevens ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Coal Fly Ash ◽  
Aluminum Ions ◽  
Naoh Solution ◽  
Zeolitic Materials ◽  
Waste Coal

The conversion of residue, by extraction processing of aluminum ions from coal fly ash to zeolitic materials by hydrothermal treatment in the presence of NaOH solution, was investigated and the resulting material characterized.

Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment

2018 ◽  
Vol 271 ◽  
pp. 1-8 ◽  
Author(s):  
Ulambayar Rentsenorov ◽  
Batmunkh Davaabal ◽  
Jadambaa Temuujin
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Cation Exchange Capacity ◽  
Coal Fly Ash ◽  
Batch Composition ◽  
Exchange Capacity ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Acid Pretreatment ◽  
Type Zeolite

Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

Effect of Fly Ash Content on Zeolite Synthesis from Coal Fly Ash Prepared by Hydrothermal Treatment.

2002 ◽  
Vol 28 (2) ◽  
pp. 155-160 ◽  
Author(s):  
Kunihiro Fukui ◽  
Motoki Kinugawa ◽  
Takashi Nishimoto ◽  
Hideto Yoshida
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Coal Fly Ash ◽  
Ash Content ◽  
Zeolite Synthesis

Utilization of incineration fly ash from biomass power plants for zeolite synthesis from coal fly ash by hydrothermal treatment

2017 ◽  
Vol 167 ◽  
pp. 92-98 ◽  
Author(s):  
Tomonori Fukasawa ◽  
Akira Horigome ◽  
Takayuki Tsu ◽  
Achmad Dwitama Karisma ◽  
Norio Maeda ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Zeolite Synthesis ◽  
Biomass Power Plants

scholarly journals Modified coal fly ash as low cost adsorbent for removal reactive dyes from batik industry

2018 ◽  
Vol 154 ◽  
pp. 01037 ◽  
Author(s):  
Agus Taufiq ◽  
Pratikno Hidayat ◽  
Arif Hidayat
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Reactive Dyes ◽  
Bet Surface Area ◽  
Batch Adsorption ◽  
Operational Parameters ◽  
Solution Ph ◽  
Percentage Removal ◽  
Modified Fly Ash

The removal of reactive dyes on modified coal fly ash has been investigated during a series of batch adsorption experiments. Physical characteristics of modified coal fly ash was characterized by Brunauer Emmett Teller (BET) surface area analysis, X-ray powder diffraction (XRD), Fourier transform infrared spectrophotometer (FT-IR), and scanning electron microscope (SEM). The effects of operational parameters such as initial dye concentration (50–200 mg/L), solution pH (4–10) and adsorbent dosage (50–200 mg/L) were studied. The adsorption experiments indicated that modified coal fly ash was effective in removing of Remazol Blue. The percentage removal of dyes increased while the modified fly ash dosage increased. The percentage removal of dyes increased with decreased initial concentration of the dye and also increased with amount of adsorbent used. The optimum of removal of dyes was found to be 94% at initial dye concentration 50 g/mL, modified fly ash dosage 250 g/mL, and pH of 2.0.

Synthesis of Zeolite Membranes from Coal Fly Ash

2011 ◽  
Vol 383-390 ◽  
pp. 1749-1752
Author(s):  
Shigeo Shirakura ◽  
Shukuhei Kojima ◽  
Kazuhiro Tanaka ◽  
Hidetoshi Kita
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Coal Fly Ash ◽  
Xrd Analysis ◽  
Organic Liquids ◽  
Zeolite Membranes ◽  
Sem Observation ◽  
Porous Supports ◽  
Optimized Conditions

Zeolite membranes were successfully synthesized from coal fly ash by hydrothermal treatment onto 10-cm-long tubular porous supports. The membranes were characterized from XRD analysis, SEM observation and the pervaporation performance. Under the optimized conditions, LTA-type membrane from coal fly ash showed fairly efficient for the dehydration of organic liquids. The maximum selectivity reached more than 3000 with accompanying flux as high as 3.0 kg/(m2•h) for separation of 90 wt% EtOH aqueous solution at 75 °C.

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