Effect of sintering temperature on crystal structure and grain size of Manganese Ores from West Sumatera

Fauzi, Ahmad; Ratnawulan, -; Putri, Phobi Juwandari

doi:10.1088/1742-6596/1040/1/012051

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Therefore, the grain size would decrease with the increase of sintering temperature. This is consistent with the results of Fauzi A et al 28) Nevertheless, there are more pores appeared on the surface of the composites sintered at high temperature (Fig. 3(d)), which can be induced by some gases from the decomposed HA.…”

Section: Microstructure Of the Sintered Compositessupporting

confidence: 92%

Characterization on Ti35Nb7Zr Based Hydroxyapatite Composites Prepared via Rapid Sintering for Biomedical Applications

Wenrui

et al. 2021

Mater. Trans.

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The TiNbZr/HA (hydroxyapatite) composites evoked widespread concern in biomedical application. However, their properties were affected by processing parameters, such as milling time, sintering temperature and pressure, etc., during sintering process. The Ti35Nb7Zr/ 10HA (hydroxyapatite) composites were herein synthesized via spark plasma sintering (SPS) at a range of temperatures (800, 900, 1000, 1100 and 1250°C). Results show that the composites are mainly composed of ¢-Ti, ¡-Ti, a little of HA and ceramic interphases, like Ti 2 O, CaTiO 3 , CaZrO 3 , CaO and Ti x P y . With the increase of sintering temperature, the the compressive strength of the composites increases from 960 to 2279 MPa, and the elastic modulus from 45 to 61 GPa, due to the increase of ceramic interphases. The vitro tests reveal that the composite sintered at 1000°C possesses excellent ability to induce the formation of bone-like apatite and cell proliferation. Therefore, the composite prepared at 1000°C with low modulus (52 GPa) and obvious bioactivity exhibits immense potential for biomedical applications.

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Section: Microstructure Of the Sintered Compositessupporting

confidence: 92%

Characterization on Ti35Nb7Zr Based Hydroxyapatite Composites Prepared via Rapid Sintering for Biomedical Applications

Wenrui

et al. 2021

Mater. Trans.

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“…However, another approach, which avoids the use of reducing agents and the associated CO 2 emissions, involves converting nonmagnetic pyrolusite (MnO 2 ) into magnetic forms of lower manganese oxides by heating/roasting of the ore in air (Gutzmmer et al 1995; Thota et al 2010; Wu et al 2015). The roasting behaviour of Mn ores/oxides has been investigated (González et al 1996; Zaki et al 1997; Faria et al 2013; Augustin et al 2015; Liu, Zhang, Wang, et al 2017; Fauzi and Putri 2018; Liu, Zhang, Wang, et al 2019; Cheraghi et al 2020). Pyrolusite can be decomposed to bixbyite (Mn 2 O 3 ) at temperatures above 400°C (Fauzi and Putri 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The roasting behaviour of Mn ores/oxides has been investigated (González et al 1996; Zaki et al 1997; Faria et al 2013; Augustin et al 2015; Liu, Zhang, Wang, et al 2017; Fauzi and Putri 2018; Liu, Zhang, Wang, et al 2019; Cheraghi et al 2020). Pyrolusite can be decomposed to bixbyite (Mn 2 O 3 ) at temperatures above 400°C (Fauzi and Putri 2018). The decomposition products of Mn-ore after roasting at temperatures greater than 900°C were found to be hausmannite (Mn 3 O 4 ) and hematite (Fe 2 O 3 ) according to thermodynamic calculations (Liu, Zhang, Wang, et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Investigation of transformations of low-grade manganese ore during the roasting process

Ali

El-Sadek

Ahmed

2022

Mineral Processing and Extractive Metallurgy

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The transformations of low-grade manganese ore were investigated during roasting in the air at different temperatures up to 1200°C. The transformations were followed up by XRD and TGA-DTA. Moreover, the morphology and magnetic properties were determined by SEM and VSM. It was observed that MnO 2 transformed to the lower oxide Mn 5 O 8 at 500°C and then to bixbyite (Mn 2 O 3 ) at 600°C. Finally, the bixbyite decomposed to hausmannite (Mn 3 O 4 ) at 800°C. Increasing the roasting temperature to 900°C induced a reaction between hematite and hausmannite and led to the formation of a small amount of solid solution of the ferrite spinel MnFe 2 O 4 . Further increase in temperature to 1000°C led to the formation of a solid solution of braunite (Mn 7 SiO 12 ) which decomposed to rhodonite (MnSiO 3 ) at 1200°C. The magnetic susceptibility of the original ore gradually increased with the roasting temperature, from 0.119 × 10 −3 at ambient temperature to a maximum value of 80 × 10 −3 at 1200°C.

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The Effect of SiMn/PS Composition on Hydrophobic Properties of Nanocomposite Thin Layer

Ratnawulan

Putri²,

Septiana³

et al. 2022

J. Phys.: Conf. Ser.

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Many researches on the synthesis of hydrophobic coatings have been carried out, but in use, the coating is easily scratched, easily damaged by contact with other objects and easy to corrode, thereby reducing the quality of the coating. This can hinder the application of hydrophobic coatings in industry and others. Therefore, it is necessary to develop a hydrophobic coating that is strong and durable and anti-corrosion so that it can improve the quality of a surface. For this reason, research is carried out by mixing a substrate that has anti-corrosion properties such as silica and is hard such as manganese in order to overcome the problems that occurred previously using the spin coating method. The precursor was made by adding 0.5 grams of polystyrene composition, with varying SiMn composition. The coating was carried out using the spin coating method and the calcination temperature was 60°C using an oven for 1 hour. The results of this study from the composition variation showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The largest contact angle at 50%:50% composition.

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Effect of sintering temperature on crystal structure and grain size of Manganese Ores from West Sumatera

Cited by 3 publications

References 5 publications

Characterization on Ti35Nb7Zr Based Hydroxyapatite Composites Prepared via Rapid Sintering for Biomedical Applications

Characterization on Ti35Nb7Zr Based Hydroxyapatite Composites Prepared via Rapid Sintering for Biomedical Applications

Investigation of transformations of low-grade manganese ore during the roasting process

The Effect of SiMn/PS Composition on Hydrophobic Properties of Nanocomposite Thin Layer

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