Thermal properties and application of silica gel waste contaminated with F− ions for C-S-H synthesis

Baltakys, K.; Iljina, Aliona; Bankauskaite, Agne

doi:10.1007/s10973-015-4663-4

Cited by 14 publications

(16 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The samples were characterised by powder X-ray diffraction (XRD; with a D8 Advance X-ray diffractometer), differential scanning calorimetry (DSC; with Netzsch DSC214 Polyma instrument), X-ray fluorescence spectroscopy (XRF; with a Bruker X-ray S8 Tiger WD spectrometer), a grain-size analyzer (CILAS 1090 LD), and scanning electron microscopy (SEM; with a JEOL JSM-7600F instrument) [17,18,34,39].…”

Section: Instrumental Analysismentioning

confidence: 99%

“…Moreover, the results of particle size distribution analysis showed that the diameter of the latter compound particles varied in a 0.03-170 µm range, while the particles with a size of 34-72 µm were dominant ( Figure 1c). It was also determined that the surface area and density of silica gel waste were equal to 281.01 m 2 /kg and 2141 kg/m 3 The samples were characterised by powder X-ray diffraction (XRD; with a D8 Advance X-ray diffractometer), differential scanning calorimetry (DSC; with Netzsch DSC214 Polyma instrument), X-ray fluorescence spectroscopy (XRF; with a Bruker X-ray S8 Tiger WD spectrometer), a grain-size analyzer (CILAS 1090 LD), and scanning electron microscopy (SEM; with a JEOL JSM-7600F instrument) [17,18,34,39].…”

Section: The Properties Of Silica Gel Waste (Sgw)mentioning

confidence: 99%

“…According to the literature, untreated silica gel waste can be immobilized in concrete stone [14,19]; however, due to effect of F − ions on the environment, the application in cement industry is limited. Also, F − ions can be bound into stable compounds during the hydrothermal synthesis of lower basicity calcium silicates hydrates [17,18,34]. For these reasons, it may be possible to use silica gel waste for the synthesis of cuspidine (3CaO•2SiO 2 •CaF 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…As a matter of fact, in the context of reducing environmental issues and enhancing economic benefits, technologies for converting waste materials into products of commercial value are in great demand [14,17,18,29,34,38]. However, the literature concerning the successful application of silica gel waste contaminated with F − ions is scarce.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value

et al. 2019

Self Cite

View full text Add to dashboard Cite

In this work, we present the possibility to reduce the amount of fluoride ions in silica gelwaste by using different techniques or to immobilize these ions by creating products ofcommercial value. The leaching of fluoride ions from silica gel waste to the liquid medium wasdone under static and dynamic conditions. It was determined that the removal of fluoride ionsfrom this compound depends on various factors, such as dissociation, solubility, the w/s ratio,reaction temperature, leaching conditions, the adsorption properties of silica gel waste, and others.The obtained results showed that, by applying different techniques, the quantity of fluoride ionscan be reduced by 60%, while obtained water was neutralized by calcium hydroxide.Additionally, it was determined that silica gel waste is a promising raw material for thehydrothermal synthesis of a stable compound containing fluoride ions – cuspidine.

show abstract

Section: Instrumental Analysismentioning

confidence: 99%

Section: The Properties Of Silica Gel Waste (Sgw)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…To prevent leakage, the fluorine can be bound into stable compounds. Silica-gel waste can be used as a source of silicon dioxide for the synthesis of calcium silicate hydrates 11–16 . This reaction is carried out in hydrothermal conditions and can also bound the pollutants of the silica-gel into stable calcium fluoride and calcium-silicate-aluminate compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of wollastonite from AlF3-rich silica gel and its hardening in the CO2 atmosphere

Gineika

Šiaučiūnas

Baltakys

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

This work combines some aspects of eco-friendliness: consumption of toxic waste, cutback of energy consumption during the synthesis of the binding material, reduction of CO2 emission by using less CaCO3 in the raw meal, and consumption of carbon dioxide. In the study, the kinetics of two-step synthesis of wollastonite from CaO and AlF3 production waste, namely, silica gel, its carbonisation process and the mechanical properties of obtained samples were investigated. According to XRD and DSC data, the optimal temperature in the mixture with CaO/(Al2O3 + SiO2) = 1 for the hydrothermal synthesis of the wollastonite precursors is 130 °C: F−–containing compounds were bound into katoite and cuspidine, and portlandite reacted completely within 8 h. The optimal temperature for wollastonite formation is 900 °C, but fluormayenite, cuspidine, and the traces of larnite form as well. During the curing in the CO2 atmosphere, wollastonite and larnite reacted completely and formed calcite, vaterite, and amorphous CaCO3. Cuspidine also participates in the carbonisation process and, in addition to amorphous SiO2, it releases fluorite, which contributes to the total compressive strength of the products. The values of the compressive strength (10–15 MPa) in the wollastonite-sand samples match the requirements for the belite and special low-heat cements.

show abstract

The stability of formed CaF2 and its influence on the thermal behavior of C–S–H in CaO–silica gel waste-H2O system

Iljina

Baltakys

Bankauskaite

et al. 2016

J Therm Anal Calorim

View full text Add to dashboard Cite

Thermal properties and application of silica gel waste contaminated with F− ions for C-S-H synthesis

Cited by 14 publications

References 31 publications

The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value

The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value

Synthesis of wollastonite from AlF3-rich silica gel and its hardening in the CO2 atmosphere

The stability of formed CaF2 and its influence on the thermal behavior of C–S–H in CaO–silica gel waste-H2O system

Contact Info

Product

Resources

About