Thermal evolution and thermochemistry of the cancrinite-group carbonate-oxalate mineral

Olysych, L. V.; Вигасина, М. Ф.; Melchakova, L. V.; Ogorodova, L. P.; Pekov, Igor V.; Чуканов, Н. В.

doi:10.1134/s0016702911050089

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…The dehydration process of cancrinite is usually complete at 600°C, while the release of CO 2 starts at 500°C and is complete by 1300°C . Although the range of temperatures at which these decomposition processes occur is dependent on the exact chemical composition of the cancrinite, the formation of nepheline is always identified, consistent with the results shown in Fig.…”

Section: Resultssupporting

confidence: 87%

“…Both of these phases are modifications of cancrisilite and belong to the cancrinite group . The crystal structures of members of this group contain vacancies and large channels in the cancrinite framework, especially some accessible 12‐rings, which allow the ingress of excess cations such as Na + and Ca 2+ , or even larger cluster ions such as [Na∙H 2 O] + …”

Section: Resultsmentioning

confidence: 99%

“…Bands between 1500 and 1300 cm −1 are related to stretching vibration of carbonate groups present in the calcite and cancrinite. Specifically, the band at 1504 cm −1 corresponds to carbonate‐bearing cancrinite groups …”

Section: Resultsmentioning

confidence: 99%

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One‐Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends

Bernal

et al. 2014

J. Am. Ceram. Soc.

207

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In this study, one‐part “just add water” geopolymer binders are synthesized through the alkali‐thermal activation of the red mud which is relatively rich in both alumina and calcium. Calcination of the red mud with sodium hydroxide pellets at 800°C leads to decomposition of the original silicate and aluminosilicate phases present in the red mud, which promotes the formation of new compounds with hydraulic character, including a partially ordered peralkaline aluminosilicate phase and the calcium‐rich phases C3A and α‐C2S. The hydration of the “one‐part geopolymer” leads to the formation of zeolites and a disordered binder gel as the main reaction products, and the consequent development of compressive strengths of up to 10 MPa after 7 d of curing. These results demonstrate that red mud is an effective precursor to produce one‐part geopolymer binders, via thermal and alkali‐activation processes.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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One‐Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends

Bernal

et al. 2014

J. Am. Ceram. Soc.

207

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“…(Figures 1(a) and (b)). This is attributed to the loss of water as well as the thermal decomposition of the carbonate-oxalate complex [16,33]. Limestone added to the system is present in relatively unchanged amounts between both these temperatures of exposure.…”

Section: Extent Of Thermal Decomposition Of Reaction Productmentioning

confidence: 99%

“…Three distinct peaks are noted in the DTG curve. The peak at around 110°C represents the evaporable water, the one at 300°C represents the thermal decomposition of iron carbonate complexed with the oxalate from the dissolution agent[16,33], and the peak at around 750°C is attributable to thermal decomposition of calcium carbonate added as an ingredient during the synthesis. The TG/DTG curves shown inFigure 1(a) are used as the baseline data.…”

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confidence: 99%

Temperature-induced phase and microstructural transformations in a synthesized iron carbonate (siderite) complex

et al. 2016

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The influence of exposure to high temperatures on the phase transformation, microstructural features, and the resultant mechanical properties of a binder based on carbonation of metallic iron powder is reported. The extent of thermal decomposition of the binder at different temperatures is quantified using thermogravimetric analysis (TGA), whereas Fourier Transform Infrared (FTIR) spectroscopy and xray diffraction (XRD) are used for the identification of transformed phases. High temperature exposure is observed to result in stable phases, which results in the material retaining structural integrity even when exposed to 800 o C, contrary to ordinary portland cement (OPC) pastes that degrade completely at such temperatures. Significant pore size refinement and a small reduction in porosity are noted when the pastes are exposed to high temperatures. Even though there is a significant strength loss when the iron carbonates decompose (around ~300 o C), the strengths are much higher than those of OPC pastes at higher temperatures. This provides an option for chemistry-based design of high-temperature resistant composites as well as develop structural envelope materials especially when prolonged resistance to more than 600 o C is desired.

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Synthesis, characterization and gas sensing performance of aluminosilicate azide cancrinite

Borhade¹,

Kshirsagar²,

Wakchaure³

et al. 2016

Bull Mater Sci

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The present investigation deals with synthesis and gas sensing performance of Na 8 [AlSiO 4 ] 6 (N 3) 2.4 (H 2 O) 4.6 cancrinite-based thick film. The product obtained was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, thermogravimetric analysis and magic-angle spin nuclear magnetic resonance (MAS NMR). The crystal structure of the product was determined from X-ray powder diffraction data by applying Rietveld refinement. Refinement showed that azide cancrinite crystallize in the space group P6 3. Alternate arrangement of Si and Al atoms was confirmed by single intense peak of MAS NMR analysis. For the first time, this study reports the gas sensing performance of aluminosilicate azide cancrinite. The effect of annealing and operating temperature on gas sensing characteristic of azide cancrinite thick film is investigated systematically for various gases at different operating temperatures. This sensor was observed to be highly sensitive and selective to ammonia gas.

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Thermal evolution and thermochemistry of the cancrinite-group carbonate-oxalate mineral

Cited by 12 publications

References 6 publications

One‐Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends

One‐Part Geopolymers Based on Thermally Treated Red Mud/NaOH Blends

Temperature-induced phase and microstructural transformations in a synthesized iron carbonate (siderite) complex

Synthesis, characterization and gas sensing performance of aluminosilicate azide cancrinite

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