Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H2SiF6) of fertilizer industry

Sarawade, Pradip B.; Kim, Jong-Kil; Hilonga, Askwar; Kim, Hee Taik

doi:10.1016/j.jhazmat.2009.08.125

Cited by 52 publications

(26 citation statements)

References 13 publications

(13 reference statements)

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“…The residual SiO 2 could be due to insufficient NaOH amounts applied in the extraction process. The major component of NaF presented in the sediment was also demonstrated by [18,19]. Besides, there was a broad peak centering at 22 • as observed from Fig.…”

Section: Characterization Of the Photonic Waste Powder (Pwp)mentioning

confidence: 53%

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

Lin

Kuo

Bai

2011

Journal of Hazardous Materials

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Section: Characterization Of the Photonic Waste Powder (Pwp)mentioning

confidence: 53%

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

Lin

Kuo

Bai

2011

Journal of Hazardous Materials

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“…Since NH 3 and HF are primarily emitted during production processes of urea fertilizers and multi-purpose fertilizers (Gilliland et al, 2006;Sarawade et al, 2010;Zhang et al, 2011), respectively, their industrial emissions from these two subareas are attributed to the industries producing these two types of fertilizers. This assertion is supported by Figs.…”

Section: Variations In Yearly Emissions In the Subareas For All Indusmentioning

confidence: 99%

Application of Stack Emissions Data from Tele-Monitoring Systems for Characterization of Industrial Emissions of Air Pollutants

Choi¹,

2011

Aerosol Air Qual. Res.

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Real monitoring data are required for the validation of models or methods used to estimate industrial emission inventories of air pollutants. As such, the current study investigated the industrial emissions of four major and three other hazardous air pollutants in four subareas of the Yeongnam area in Korea over five years (2005 through 2009), using direct stack monitoring concentrations, which were obtained from tel-monitoring systems. Yearly variations in the industrial emissions of the target pollutants depended upon the subareas and chemical types. For example, the total suspended particulate (TSP) emissions in Geongnam increased for two consecutive years (2007 and 2008) and then, decreased in 2009, whereas the industrial CO emissions in Ulsan sharply increased since 2007. For TSP, primary metal manufacturing (PMM) and Power, electricity and gas supplying companies (PEGSC) were two major industrial emission sources. PEGSC exhibited the highest source for both SO 2 and NO x emissions, followed by PMM and petroleum and petrochemical companies in descending order. For CO emissions, PPM exhibited the highest source, followed by municipal waste treatment and intermediate waste treatment facilities in descending order. Both NH 3 and HF were emitted primarily from two subareas (Ulsan and Geongbuk), which have fertilizer production companies. Both Geongnam and Geongbuk exhibited the highest and the second highest HCl emissions, presumably due to emissions during the acid treatment processes of various metals. Most of the industry categories, which are associated with fuel combustions or waste incineration, exhibited the highest and the second highest emission proportions for NO x and SO 2 , respectively. Maximum emissions were observed in the winter or summer season, while minimum emissions were observed in the spring or fall season, presumably due to increased energy utilizations for residential as well as industrial heating and cooling.

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“…ANDRZEJ et al [7] synthesized SiO 2 and AlF 3 from H 2 SiF 6 and Al(OH) 3 , respectively. SARAWADE et al [8] prepared high surface area mesoporous SiO 2 from H 2 SiF 6 by the reaction of Na 2 CO 3 . Recently, SHI [9] developed a new method to produce white carbon and NaF from Na 2 SiF 6 suspensions by reaction with Na 2 CO 3 ·10H 2 O solutions.…”

Section: Introductionmentioning

confidence: 99%

Recovery of high specific area silica and sodium fluoride from sodium hexafluorosilicate

Gui

Cheng

Liu

2014

J. Cent. South Univ.

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Sodium fluoride and high specific area silica were synthesized by using sodium hexafluorosilicate (Na 2 SiF 6 ) and sodium carbonate decahydrate (Na 2 CO 3 ·10H 2 O). The influencing factors of react temperature, contact time, sodium dodecyl sulfate (SDS) and molar ratio of Na 2 SiF 6 to Na 2 CO 3 ·10H 2 O were investigated. The optimum process involves the reaction of 0.075 mol Na 2 SiF 6 and 150 mL, 0.225 mol Na 2 CO 3 ·10H 2 O (molar ratio of 1:3) at 85 °C for 90 min, and 2.0×10 −3 mol sodium dodecyl sulfate (SDS) as additive. The results show that the purities of SiO 2 and NaF at extraction yields of 96.5% and 98.0% are 91.0% and 98.6%, respectively. The obtained SiO 2 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared ray (FTIR), differential scanning calorimetry and thermogravimetric analysis (DSC-TGA), N 2 absorption/desorption (BET) and laser particle size analyzer. The result demonstrates that SiO 2 particles have a high BET surface area of 103 m 2 /g, and a mean grain size of 985 nm.

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Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H2SiF6) of fertilizer industry

Cited by 52 publications

References 13 publications

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

Application of Stack Emissions Data from Tele-Monitoring Systems for Characterization of Industrial Emissions of Air Pollutants

Recovery of high specific area silica and sodium fluoride from sodium hexafluorosilicate

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