Reaction Products in the System MgCl<sub>2</sub>‐NaOH‐H<sub>2</sub>O

Mažuranić, Carmen; Bilinski, Halka; Matković, B.

doi:10.1111/j.1151-2916.1982.tb10346.x

Cited by 40 publications

(23 citation statements)

References 5 publications

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“…In any case, hydroxide is sequestered in these salts and is available to neutralize SO 2 as it is taken up and oxidized to sulfate. The solubility 111 of Mg 2 (OH) 3 Cl Á 4H 2 O is such that it requires lower pH values to dissolve this salt compared to Mg(OH) 2 . It is thus expected that the hydroxide will dissolve first as acid is generated by the sulfite oxidation, followed by dissolution of Mg 2 (OH) 3 …”

Section: Resultsmentioning

confidence: 99%

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

Shaka

Robertson

Finlayson-Pitts

2007

Phys. Chem. Chem. Phys.

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A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol. Diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) is a powerful technique for analyzing solid powders and for following their reactions in real time. We demonstrate that it can also be applied to studying the uptake and reactions of gases in liquid films. Within the DRIFTS cell, a 10% (w/w) mixture of MgCl 2 Á 6H 2 O in NaCl was equilibrated with air at 50% RH, which is above the deliquescence point of the magnesium salt but below that of NaCl. This mixture of NaCl coated with an aqueous magnesium chloride solution was then reacted with gas phase OH to generate hydroxide ions via a previously identified interface reaction. This treatment, hereafter referred to as OH-processing, was sufficient to convert some of the magnesium chloride to Mg(OH) 2 and Mg 2 (OH) 3 Cl Á 4H 2 O, making the aqueous film basic and providing a reservoir of alkalinity. Subsequent addition of SO 2 to the basic processed mixture resulted in its uptake and conversion to sulfite which was measured by FTIR. The sulfite was simultaneously oxidized to sulfate by HOCl/OCl À that was formed in the initial OH-processing of the salt. Further uptake and oxidation of SO 2 in the aqueous film took place when the salt was subsequently exposed to O 3 . These studies demonstrate that DRIFTS can be used to study the chemistry in liquid films in real time, and are consistent with the hypothesis that the reaction of gaseous OH with chloride ions generates alkalinity that enhances the uptake and oxidation of SO 2 under these laboratory conditions.

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Section: Resultsmentioning

confidence: 99%

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

Shaka

Robertson

Finlayson-Pitts

2007

Phys. Chem. Chem. Phys.

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“…When calcining dolomite for the production of a cement dolomitic binder, the main firing products are magnesium oxide MgO, carbon dioxide CO 2 and calcium carbonate CaCO 3 . Decarbonization of calcium carbonate is not carried out, since the firing temperature is kept below the start of the decomposition of CaCO 3 .…”

Section: Emissions Of Co 2 Into the Atmosphere From The Raw MIXmentioning

confidence: 99%

“…The firing temperature is 700 -780 0 C. The samples were formed in two ways: with sand (cement in a ratio of 1: 3) and without sand. The closure was carried out with a solution of magnesium chloride six-water diluted with water to a density of 1.2 g/cm 3 . When using a mixture of sand the compressive strength of the samples was 22.5 MPa in 28 days.…”

Section: Emissions Of Co 2 Into the Atmosphere From The Raw MIXmentioning

confidence: 99%

Ecological indices of manufacture of Portland cement clinker and production of the dolomite clinker

Vinnichenko

Ryazanov

2017

MATEC Web Conf.

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“…This can complicate the modelling process through difficulties associated with the control of the rate of dissolution, and subsequent nucleation of heavy metal hydroxides. It has been observed that the dissolution rate of magnesia is highly dependent on the nature of the supporting electrolyte (Mažuranić et al, 1982). Therefore, kinetic factors related to the dissolution of brucite may control the nature of the solubility-limiting phases produced in these systems.…”

Section: Introductionmentioning

confidence: 98%

Heavy Metals in Wastewater: The Effect of Electrolyte Composition on the Precipitation of Cadmium(II) Using Lime and Magnesia

Lin

Burns

Lawrance

2005

Water Air Soil Pollut

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The effect of effluent composition on the efficiency of hydroxide precipitation of Cd(II), using both lime and magnesia as precipitants, has been modelled by the solubility domain approach in order to provide wastewater effluent treatment limits, and has been experimentally validated. Common anionic species such as Cl − , SO 4 2− and CO 3 2− have been treated. Solubility domain calculations were based on those phases that were found to determine metal solubility for systems representing the upper and lower limits of potential effluent chemical compositions. The isolated phases were found to resemble their mineralized counterparts, although in several cases exhibited a lower degree of structural order. Experimentally determined Cd(II) solubilities were generally encompassed within the calculated solubility domains, indicating that solubility domain predictions provide effluent treatment quality assurance ranges for the hydroxide precipitation process. The formation of gypsum (CaSO 4 ·2H 2 O) and calcite (CaCO 3 ) at higher SO 4 2− and CO 3 2− concentrations as secondary precipitates using lime as the precipitant, and the hydroxy-sulfate Mg 2 (OH) 2 SO 4 ·xH 2 O, nesquehonite (MgCO 3 ·4H 2 O), hydromagnesite [Mg 5 (OH) 2 (CO 3 ) 4 ·4H 2 O] and brucite [Mg(OH) 2 ] when employing magnesia was shown to have little effect on the observed residual Cd(II) solubility, although Mg(OH) 2 did promote β-Cd(OH) 2 formation in the Mg 2+ -containing Cd(II)/Cl − and Cd(II)/SO 4 2− systems.

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Reaction Products in the System MgCl₂‐NaOH‐H₂O

Cited by 40 publications

References 5 publications

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

Ecological indices of manufacture of Portland cement clinker and production of the dolomite clinker

Heavy Metals in Wastewater: The Effect of Electrolyte Composition on the Precipitation of Cadmium(II) Using Lime and Magnesia

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Reaction Products in the System MgCl2‐NaOH‐H2O

Cited by 40 publications

References 5 publications

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

A new approach to studying aqueous reactions using diffuse reflectance infrared Fourier transform spectrometry: application to the uptake and oxidation of SO2 on OH-processed model sea salt aerosol

Ecological indices of manufacture of Portland cement clinker and production of the dolomite clinker

Heavy Metals in Wastewater: The Effect of Electrolyte Composition on the Precipitation of Cadmium(II) Using Lime and Magnesia

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Reaction Products in the System MgCl₂‐NaOH‐H₂O