Low temperature production of wollastonite from limestone and silica sand through solid-state reaction

Rashid, Rashita Abd; Shamsudin, Roslinda; Hamid, Muhammad Azmi Abdul; Jalar, Azman

doi:10.1016/j.jascer.2014.01.010

Cited by 63 publications

(39 citation statements)

References 14 publications

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“…This is probably caused by a suppression of mullite formation by the combination of decomposition of clay minerals with the excess of CaO, yielding gehlenite instead of mullite . Ptácek et al suggested that a preexperimental intensive milling procedure could facilitates the formation of gehlenite from intermediate phases such as dicalcium silicate and tricalcium aluminate, that, however, have not been observed as precursor phases of gehlenite in this study. In contrast, dicalcium silicate was found to replace gehlenite during cooling.…”

Section: Discussionmentioning

confidence: 56%

“…Ptácek et al ascribes the occurrence of wollastonite at 1050°C in a mixture of kaolin and calcite to a reaction of dicalcium silicate with free silica:

\begin{matrix} C {normala}_{2} Si {normalO}_{4} \\ Chalcio - olivine or larnit \end{matrix} + \begin{matrix} Si O_{2} \\ Silica \end{matrix} \overset{Δ (T) 1025 - 1050^{\circ} C}{false\to} \begin{matrix} 2 normalβ - CaSi {normalO}_{3} \\ Wollastonite \end{matrix} .

…”

Section: Discussionmentioning

confidence: 99%

“…Gehlenite was already identified at a temperature of about 750°C (F-Exp and S-Exp) that is about 50°C lower than previously reported 32 . The cause for this differences might be: (i) the low sensitivity (for traces of mineral phases) of the analytical techniques used in previous work (i.e., XRD) that did not allow the detection of small reaction rims between silicates and carbonates, (ii) the use of a different composition of the starting material, such as Ca or Mg which may suppress or support the formation of new phases or trigger the formation of partial melts, and/or iii) the preexperimental intensive milling procedure which facilitates the formation of gehlenite from intermediate phases such as dicalcium silicate and tricalcium aluminate phase 33 and the multiple solid-solid interfaces created by the pressing during sample preparation. In addition, the presence of multiple interfaces among different crystals may enhance finger development (an interface geometry that is observed at carbonate-silicate interface), resulting in kinetic changes favoring phase formations at lower temperatures.…”

Section: Formation Of Calcium Silicatesmentioning

confidence: 99%

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Insights into the evolution of carbonate‐bearing kaolin during sintering revealed by in situ hyperspectral Raman imaging

2017

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Sintering reactions of clay bodies have previously been studied by numerous experiments that involve quenching of the sintered ceramic bodies to room temperature and analyzing the reaction product by different analytical techniques. In this study, green bodies containing quartz, alkali feldspar, kaolinite, and calcite, were progressively fired in air at various temperatures from room temperature to about 1060°C. For the first time, mineral reactions and textural relationships were studied in situ as a function of temperature and time with a spatial resolution of a few micrometers by confocal hyperspectral Raman imaging. Gehlenite, wollastonite, and pseudowollastonite could unambiguously be identified as newly formed phases during sintering, and their textural evolution could be followed with temperature and time. From 800°C onwards wollastonite formed at the direct contact to gehlenite, whereby at temperatures higher than 990°C wollastonite seems to be gradually replacing gehlenite. The crystallization of pseudowollastonite was observed already ~290°C below the accepted critical temperature (~1125°C) for the wollastonite‐to‐pseudowollastonite transformation, suggesting that pseudowollastonite can form metastably. The results of this study demonstrate that hyperspectral Raman imaging is a powerful method to study in situ phase transitions and recrystallization processes at grain boundaries during high‐temperature sintering of ceramic materials.

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Section: Discussionmentioning

confidence: 56%

“…Ptácek et al ascribes the occurrence of wollastonite at 1050°C in a mixture of kaolin and calcite to a reaction of dicalcium silicate with free silica:

\begin{matrix} C {normala}_{2} Si {normalO}_{4} \\ Chalcio - olivine or larnit \end{matrix} + \begin{matrix} Si O_{2} \\ Silica \end{matrix} \overset{Δ (T) 1025 - 1050^{\circ} C}{false\to} \begin{matrix} 2 normalβ - CaSi {normalO}_{3} \\ Wollastonite \end{matrix} .

…”

Section: Discussionmentioning

confidence: 99%

Section: Formation Of Calcium Silicatesmentioning

confidence: 99%

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Insights into the evolution of carbonate‐bearing kaolin during sintering revealed by in situ hyperspectral Raman imaging

2017

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“…It was observed that it was growing with the curing age. In this study, this peak corresponds to the crystallization of wollastonite [38][39][40], and it is visible for the samples with the amount of the burnt clay shale less than or equal to 50%, but it is not at the same temperature. The temperature of this peak increases with the amount of the burnt clay shale.…”

Section: Thermal Characteristics Obtained By Differential Scanning Camentioning

confidence: 95%

Thermal analysis of high‐performance mortar containing burnt clay shale as a partial portland cement replacement in the temperature range up to 1000 °C

et al. 2016

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SUMMARYClay shale is a specific type of material that contains a large amount of kaolinite. Burnt clay shale belongs to a large group of pozzolans, and its pozzolanic properties are activated after burning at temperatures similar to those when kaolinite is transformed into metakaolin. In this study, fine powder of burnt clay shale was used for the design of a high-performance mortar as a partial replacement for portland cement up to 60 wt.%. The prepared specimens were subjected to a thermal analysis by using differential scanning calorimetry, thermogravimetry, and thermodilatometry. The investigation was performed in the temperature range 25-1000°C. The basic physical and mechanical properties were studied as well. It was demonstrated that it is possible to design and produce a high-performance mortar containing fine burnt clay shale powder and that an appropriate amount of this replacement is up to 20 wt.%.

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“…This is consistent with literature [24] and evidenced by the increased number of quartz peaks at 850 °C. The advanced stage of calcite dissociation was detected at 750 °C by the appearance of wollastonite (Figure 5c), which results from a solid-state reaction between silica and calcium carbonate [25]. The silica content of wollastonite is thought to be derived from the degradation of anthophyllite and the primary quartz of marl sample.…”

Section: Mineral Transformation On Calcinationmentioning

confidence: 99%

Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

2018

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Abstract:The present study mainly investigates the synthesis of calcined marl-based geopolymeric cement under different synthesis conditions including NaOH concentration, sodium silicate (SS)/sodium hydroxide (SH) mass ratios, solid (S)/liquid (L) mass ratios, calcination temperatures, curing temperatures, curing times, and aging intervals. The studied head sample was obtained from the Abu-Tartur phosphate mine in the Western Desert of Egypt and subjected to chemical and mineralogical characterizations using X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform-infrared spectroscopy (FT-IR). Regarding calcination, this was conducted at 550, 650, 750, and 850 • C for one hour and resulted in thermal decomposition of calcite and saponite and the formation of new mineral phases including anthophyllite, wollastonite, and silica. On the other hand, the geopolymerization process was initiated by mixing the calcined marl sample with the alkali activation solution at different mixing ratios and varying curing conditions. The compressive strength measurements indicate that 750 • C, 12 M NaOH, 0.6 SS/SH mass ratio, 2 S/L mass ratio, 80 • C curing temperature, 12 h curing time, and 28 days aging time are considered all to be the optimum synthesis conditions of the Abu-Tartur calcined marl-based geopolymer.

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Low temperature production of wollastonite from limestone and silica sand through solid-state reaction

Cited by 63 publications

References 14 publications

Insights into the evolution of carbonate‐bearing kaolin during sintering revealed by in situ hyperspectral Raman imaging

Insights into the evolution of carbonate‐bearing kaolin during sintering revealed by in situ hyperspectral Raman imaging

Thermal analysis of high‐performance mortar containing burnt clay shale as a partial portland cement replacement in the temperature range up to 1000 °C

Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

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