Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process

Li, Huiquan; Hui, Jingshu; Wang, Chenye; Wang, Bao; Sun, Ze

doi:10.1016/j.hydromet.2015.02.001

Cited by 17 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some unconventional materials: kaolinite and metakaolin [17], K-feldspar [18], the igneous rocks trachyte [19] and fuka [20], the sedimentary rock opoka [8,21] were used for these goals. A great amount of data in the literature supports the idea that tobermorite family minerals can be synthesised from industrial by-products and wastes: coal fly ash [22], biomass ash [23], high alumina fly ash [24], blast furnace slag [25], steel slag [26], oil shale fly ash [27], and newsprint recycling waste [28].…”

Section: Introductionmentioning

confidence: 98%

THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

Smalakys¹

2020

Ceramics - Silikaty

View full text Add to dashboard Cite

This study presents the peculiarities that occur during the hydrothermal synthesis of 1.13 nm tobermorite from granite sawing powder waste and CaO. The molar ratios of the primary mixtures were CaO/SiO 2 = 0.83 and 1.0; a hydrothermal curing temperature of 180 and 200 °C; a duration of 4, 8, 12, 24, 72 h. The instrumental analyses (XRD, STA, SEM, TMA) data showed that this industrial by-product is a suitable material to synthesise of 1.13 nm tobermorite. Traces of the aforementioned mineral together with semi-amorphous C-S-H(I) were detected after 4 h at 180 °C. The crystallinity of the target mineral in the products grows steadily throughout the entire duration of the synthesis (up to 72 h at 180 °C). By increasing the temperature of the hydrothermal curing to 200 °C, the highest crystallinity of the 1.13 nm tobermorite was identified after 8 h of isothermal curing. Due to the chemical composition of the granite sawing powder waste, the 1.13 nm tobermorite remains stable and does not recrystallise into xonotlite even after 72 h at 200 °C in mixtures with CaO/SiO 2 = 1.0.

show abstract

Section: Introductionmentioning

confidence: 98%

THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

Smalakys¹

2020

Ceramics - Silikaty

View full text Add to dashboard Cite

show abstract

“…However, it is known that NaCaHSiO 4 exhibits strong alkalinity and can potentially damage agricultural land and groundwater if not appropriately treatment [ 18 ]. Previous studies have indicated that NaCaHSiO 4 is easily digested and converted to tobermorite adsorbent (TA) in diluted alkaline solution [ 19 , 20 ]. Additionally, the physiochemical properties of TA make it a potential adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Mild Hydrothermal Synthesis of 11Å-TA from Alumina Extracted Coal Fly Ash and Its Application in Water Adsorption of Heavy Metal Ions (Cu(II) and Pb(II))

Yang

Sun

Peng

et al. 2022

IJERPH

View full text Add to dashboard Cite

Non-biodegradable copper (Cu) and lead (Pb) contaminants in water are highly toxic and have series adverse effects. Therefore, it is very important to extract heavy metals from wastewater before it is discharged into the environment. Adsorption is a cost-effective alternative method for wastewater treatment. Choosing a low-cost adsorbent can help reduce the cost of adsorption. In this study, conversion of reside after extracting aluminum (REA) produced by sub-molten salt method transform high-alumina coal fly ash (CFA) into 11Å-tobermorite to adsorb Cu(II) and Pb(II) from aqueous solutions at room temperature. The synthesis of the adsorbent was confirmed using scanning electron microscope (SEM), X-ray diffractometer (XRD) and Brunauer–Emmett–Teller (BET) method surface analysis. To study the adsorption characteristics, factors such as initial Cu(II) and Pb(II) concentration, pH, contact time, adsorption characteristics and temperature were investigated in batch mode. The maximum adsorption capacity of Cu(II) and Pb(II) was 177.1 mg·g−1 and 176.2 mg·g−1, respectively. The Langmuir adsorption model was employed to better describe the isothermal adsorption behavior and confirm the monolayer adsorption phenomenon. The pseudo-second-order kinetic model was used to highlight Cu(II) and Pb(II) adsorption kinetics. Thermodynamic analysis indicated the removal Cu(II) and Pb(II) by TA-adsorbent was a nonspontaneous and exothermic reaction. The obtained results are of great significance to the conversion of industrial waste to low-cost adsorbent for Cu(II) and Pb(II) removal from water.

show abstract

Utilization of coal fly ash in China: a mini-review on challenges and future directions

Luo

et al. 2020

Environ Sci Pollut Res

109

View full text Add to dashboard Cite

Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process

Cited by 17 publications

References 14 publications

THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

Mild Hydrothermal Synthesis of 11Å-TA from Alumina Extracted Coal Fly Ash and Its Application in Water Adsorption of Heavy Metal Ions (Cu(II) and Pb(II))

Utilization of coal fly ash in China: a mini-review on challenges and future directions

Contact Info

Product

Resources

About