Synthesis of zeolite from coal fly ash by microwave hydrothermal treatment with pulverization process

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

Journal of the Serbian Chemical Society ◽

10.2298/jsc0306471v ◽

2003 ◽

Vol 68 (6) ◽

pp. 471-478 ◽

Cited By ~ 17

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.

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Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash

Fuel ◽

10.1016/j.fuel.2018.05.141 ◽

2018 ◽

Vol 232 ◽

pp. 124-133 ◽

Cited By ~ 34

Author(s):

Ronghong Lin ◽

Mengling Stuckman ◽

Bret H. Howard ◽

Tracy L. Bank ◽

Elliot A. Roth ◽

...

Keyword(s):

Rare Earth ◽

Fly Ash ◽

Rare Earth Elements ◽

Sequential Extraction ◽

Hydrothermal Treatment ◽

Coal Fly Ash

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The Influence of Modification Conditions on Activation of Coal Fly Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.813.471 ◽

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.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.610 ◽

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.

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.271.1 ◽

2018 ◽

Vol 271 ◽

pp. 1-8 ◽

Cited By ~ 4

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.

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Synthesis of zeolite A from coal fly ash by alkali fusion followed by hydrothermal treatment

Journal of the Korean Oil Chemists Society ◽

10.12925/jkocs.2015.32.2.240 ◽

2015 ◽

Vol 32 (2) ◽

pp. 240-247

Author(s):

Ji-Baek Jeong ◽

Ko-Yeol Choi

Keyword(s):

Fly Ash ◽

Hydrothermal Treatment ◽

Coal Fly Ash ◽

Zeolite A ◽

Alkali Fusion

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Application of Modified Coal Fly Ash as an Absorbent for Ammonia-Nitrogen Wastewater Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.2380 ◽

2012 ◽

Vol 518-523 ◽

pp. 2380-2384 ◽

Cited By ~ 4

Author(s):

Xiao Jing Chen ◽

Yan Xia Guo ◽

Fang Qing Cheng ◽

Hui Ping Song ◽

Nan Zheng ◽

...

Keyword(s):

Wastewater Treatment ◽

Fly Ash ◽

Porous Structure ◽

Sodium Hydroxide ◽

Hydrothermal Treatment ◽

Sodium Carbonate ◽

Coal Fly Ash ◽

Xrd Analysis ◽

Ammonia Nitrogen ◽

Raw Material

Three methods, sodium hydroxide hydrothermal treatment, sodium carbonate calcination-hydrothermal treatment, and sodium hydroxide calcination-hydrothermal treatment, were used to modify fly ash as an adsorbent for wastewater treatment. Results from XRD analysis show that the fly ash with sodium hydroxide hydrothermal treatment the fly ash has a porous structure in which alumina disappear and silica is dissolved. With sodium carbonate calcination-hydrothermal treatment exhibits nepheline and Na7Al7SiO16 structures. With sodium hydroxide calcination-hydrothermal treatment a zeolite-like new phase and porous structure can be observed. Results from SEM and BET indicate that the specific surface area increases from 0.160 m2/g for the raw material to 7.22 m2/g, 1.05m2/g and 276 m2/g for the respectively modified by sodium hydroxide hydrothermal treatment, sodium carbonate calcination-hydrothermal treatment and sodium hydroxide calcination-hydrothermal treatment. The three modified fly ash were used to treat a concentration of 80 mg/L of ammonia-nitrogen wastewater. The removal capacity for the three modified ash was 58%, 44% and 94% respectively that was significant higher than 14% for the original fly ash. These results show that fly ash by alkali modification can improve the activity and enhance the ability of ammonia-nitrogen wastewater treatment.

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