Fluoride technology for fabrication of mullite articles from quartz-topaz

Buinovskii, A. S.; D’yachenko, A. N.; Погребенков, В. М.

doi:10.1007/s10717-006-0138-1

Cited by 1 publication

(1 citation statement)

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“…Phase of fly ash in the largest proportion is mullite, but it has low reactivity [11]. It is stable and often used to produce high-temperature refractory materials [12]. In other hand, free alumina and silica have certain reactivity.…”

Section: Resultsmentioning

confidence: 99%

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

Chen

Guo

Cheng

et al. 2012

AMR

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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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Section: Resultsmentioning

confidence: 99%