Properties of Soluble Silicates

Weldes, Helmut H.; Lange, K.

doi:10.1021/ie50712a008

Cited by 109 publications

(57 citation statements)

References 13 publications

(20 reference statements)

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“…Because of its unique chemical properties, e.g. buffering ability, surface charges modifying ability, heat and chemical stability, polymerizing capability, and viscosity regulating ability, sodium silicates have been used as cleaners and detergents, modifying reagents in flotation, and binders in agglomeration just to name a few applications [1,2]. Among a wide variety of applications where these properties are utilized, an important one is the use of sodium silicate as a deflocculation agent in clay mining processes and ore flotation.…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, Hiemstra et al modelled silicate sorption onto goethite from 1.0 × 10 −4 to 1.0 × 10 −3 mol L −1 solutions using a modified surface complex model (CD-MUSIC distribution model) [21]. They concluded that a bidentate surface complex (≡Fe 2 O 2 Si(OH) 2 ) is favoured at low surface loading while at high surface loading polymerized species are more likely. Jordan et al [22] used titration and sorption data along with the Fiteql 4.0 code to model the surface complexes formed when dilute silicate solutions (<2.0 × 10 −4 mol L −1 ) were sorbed on three different iron oxides, viz.…”

Section: Introductionmentioning

confidence: 99%

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A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

166

105

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The sorption of sodium silicate by synthetic magnetite (Fe 3 O 4 ) at different pH conditions (pH 7-11) and initial silicate concentrations (1 × 10 −3 and 10 × 10 −3 mol L −1 ) was studied using in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The analysis of infrared spectra of sodium silicate in solution as well as adsorbed on magnetite nano-particles clearly showed the evolution of different silicate species depending on pH and silica concentration. The silicate concentration studied (10 × 10 −3 mol L −1 ) contained polymeric or condensed silicate species at lower pH as well as monomers at high pH, as evident from infrared spectra. Condensation of monomers resulted in an increased intensity of absorptions in the high frequency part (>1050 cm −1 ) of the spectral region, which contains information about both silicate in solution and sorbed silicate viz. 1300 cm −1 -850 cm −1 . In the pH range studied, infrared spectra of sorbed silicate and sorbed silicate during desorption both indicated the presence of different types of surface complexes at the magnetite surface. The sorption mechanism proposed is in accordance with a ligand exchange reaction where both monodentate and bidentate complexes could exist at low surface loading level, the relative proportion of the complexes being due to both pH and concentration in solution. Oligomerization occurred on the magnetite surface at higher surface loading.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

166

105

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“…have compositions characterised by a molar SiO 2 :Na 2 O ratio (R m ) of 1.8 to 4 (ratios of 2.0 and 3.3 are standard compositions) and a SiO 2 content of 25 wt.% to 30 wt.% (Weldes and Lange [1]). …”

mentioning

confidence: 99%

“…The concurring method is dissolving alkaline silicate glasses in H 2 O at elevated temperatures up to 150˚C. The hydrothermal dissolution of silica is usually restricted to compositions with R m < 2.7 [1]. Possibly, these concentration limitations are due to chemical saturation.…”

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Hydrothermal Dissolution of Opal in Sodium Hydroxide Lyes for the Synthesis of Water Glass

Pfeiffer¹,

Enke²,

Roth³

et al. 2017

ACES

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Common opal was dissolved in NaOH lyes in rotating autoclaves. The starting material was characterized by X-ray diffraction and adsorption spectroscopy, thermal and chemical analysis, electron and atomic force microscopy. The opal proved to be an Opal-CT with a microstructure consisting of microcrystalline tridymite, traces of low-quartz, and amorphous parts built up by random packings of size distributed amorphous silica colloids. The dissolution conditions have been inspired by the technological process of hydrothermal water glass synthesis by dissolving silica. Temperature and time of the dissolution process as well as initial molar SiO 2 :Na 2 O (R m ) ratios of the starting materials were varied systematically. The particle size of the samples was varied, too, but due to the nanoscopic microstructure without greater impact on dissolution kinetics. The process products were analyzed chemically. Additionally, some of them were characterized by X-ray diffraction, viscosimetry and dynamic light scattering. Already after short dissolution times, water glasses with quite high silica concentrations of up to 27 wt.% and SiO 2 :Na 2 O ratios of up to 3.7 were obtained. At longer dissolution times low-quartz and analcime precipitated and the SiO 2 contents were reduced to about 22 wt.% and R m to about 2.7. The silica contents in equilibrium with low-quartz were almost independent on temperature.

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Silicon Compounds, Synthetic Inorganic Silicates

Falcone

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Synthetic alkali silicates containing alkali metal oxides are manufactured as liquids or glasses that readily dissolve in water to form alkaline solutions. These silicates contain a complex mixture of polymeric species that vary as a function of alkali‐to‐silica ratio of the material, solution concentration, impurities content, and pH. The polymer chemistry of silicates influences the properties and function of these materials in a variety of applications, spanning much of the chemical process industry. Uses are in detergency, water treatment, mineral beneficiation, bleach stabilization, enhanced oil recovery, and as a raw material for the syntheses of silica sols, gels and precipitates, zeolites, clays, and other siliceous materials. The speciation and structure of silicates, studied using a broad variety of analytical methods, are discussed. Properties of the synthetic alkali silicates that determine their function in a variety of commercial applications are presented. Economic, manufacturing, regulatory, and environmental aspects of silicate production and usage are reviewed.

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Properties of Soluble Silicates

Cited by 109 publications

References 13 publications

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Hydrothermal Dissolution of Opal in Sodium Hydroxide Lyes for the Synthesis of Water Glass

Silicon Compounds, Synthetic Inorganic Silicates

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