Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

Ichikawa, Shintaro; Fujimura, Daiki; Ohbuchi, Atsushi; Nakamura, Toshihiro

doi:10.2355/isijinternational.isijint-2016-392

Cited by 6 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD-Rietveld method has been applied to iron sintered ores. 15,16) However, in this case, particular attention must be paid to the following factors: (a) Fe, which is the main component of the ores and iron sintered ores, absorbs Cu Kα X-rays that are often used as a X-ray source for XRD. (b) Iron sintered ores are composed of crystalline phases with a wide range of particle diameter sizes.…”

Section: Accuracy Improvement Of the Xrd-rietveld Methods For The Quantification Of Crystalline Phases In Iron Sintered Ores Through The mentioning

confidence: 99%

Accuracy Improvement of the XRD-Rietveld Method for the Quantification of Crystalline Phases in Iron Sintered Ores through the Correction of Micro-absorption Effects

et al. 2020

View full text Add to dashboard Cite

Section: Accuracy Improvement Of the Xrd-rietveld Methods For The Quantification Of Crystalline Phases In Iron Sintered Ores Through The mentioning

confidence: 99%

Accuracy Improvement of the XRD-Rietveld Method for the Quantification of Crystalline Phases in Iron Sintered Ores through the Correction of Micro-absorption Effects

et al. 2020

View full text Add to dashboard Cite

“…These methods yield the analysis of the total carbon in cast iron; however, they do not allow the separative analysis of graphite and its polymorphism. X-ray diffractometry, which is used for the analysis of crystalline materials, such as zinc oxide, 18) asbestos, 19) calcium sulfate in air particles, 20) cement, 21) refractory materials, 22) and sintered ore 23) can be used to distinguish the analysis of different crystal phases of graphite and its polymorphism. Therefore, we propose a method to easily provide separative determination for different types of graphite by X-ray diffraction (XRD).…”

Section: Introductionmentioning

confidence: 99%

Phase Quantification of Regular and Turbo-stratified Graphite in Cast Iron by X-ray Diffractometry/Rietveld Refinement

et al. 2021

Self Cite

View full text Add to dashboard Cite

A method to quantify regular graphite and turbo-stratified graphite (TS-graphite) forming the free carbon in ductile cast iron was developed using X-ray powder diffractometry. Iron in accurately sampled 2-4 g of the ductile cast iron powder was decomposed using hydrochloric acid without heating, and the residue was centrifugally separated. Graphite, TS-graphite, wustite (FeO), and amorphous silicate were identified in the residue. Calibration-standard mixtures were prepared by mixing corundum (α-Al 2 O 3 ), griceite (LiF), and graphite powder which showed the most similar full-width at half-maximum value of (002) line to that of graphite in the ductile cast iron sample. The calibration curve of graphite showed good linearity, with a range of 0-200 mg corresponding to the 0-5.0 mass% of graphite in the 4.00 g of the cast iron sample. The quantitative value of total graphite in the ductile cast iron sample was 3.17 mass% with 8.0% of relative standard deviation for n = 5. The peak area ratio of graphite and TS-graphite was calculated using Rietveld refinement by assuming the same atomic scattering factor for each graphite measurement. The concentration ratio of graphite and TS-graphite were 67.8 and 32.2%, respectively. The analytical values of graphite were in good agreement with those of the NIST gray cast iron standard material, with concentration ratio of 53.7% and 46.3% for graphite and TS-graphite, respectively.

show abstract

“…To avoid this, the knowledge of analyzed microstructure is necessary. Nowadays, the research in the field of iron ore sinter mineralogy is concentrated on one group of the bonding phases -complex calcium ferrites (designated as SFCA, an acronym for silicoferrite of calcium and aluminum), which accumulate besides Fe2O3 and CaO also SiO2, Al2O3 and other minority components [3][4][5]. In industrially produced sinters, there are 2 types of SFCA-s according to the chemical composition: low-Fe SFCA and high-Fe SFCA-I [6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Iron Ore Sinter Mineralogy Quantification

Mežibrický

Fröhlichová

2017

Acta Metall Slovaca

View full text Add to dashboard Cite

At present, the powder XRD is widely used analytical method for iron ore sinter mineralogy determination. In many types of research, diffraction data for SFCA and SFCA-I phases were not available, and diffraction data for other calcium ferrites were used instead. Therefore, the aim of this paper is to bring a comparison between the evaluation of diffractograms, when SFCA/SFCA-I, and, other calcium ferrites, respectively, are considered. As a result, the quantification of phases is quite comparable, when minerals are collected into groups, i.e. hematite, magnetite, calcium ferrites, silicates and non-assimilated non-ferrous phases. Only in the case of silicates, a comparison tends to be dissatisfactory.

show abstract

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

Cited by 6 publications

References 42 publications

Accuracy Improvement of the XRD-Rietveld Method for the Quantification of Crystalline Phases in Iron Sintered Ores through the Correction of Micro-absorption Effects

Accuracy Improvement of the XRD-Rietveld Method for the Quantification of Crystalline Phases in Iron Sintered Ores through the Correction of Micro-absorption Effects

Phase Quantification of Regular and Turbo-stratified Graphite in Cast Iron by X-ray Diffractometry/Rietveld Refinement

Comparison of Iron Ore Sinter Mineralogy Quantification

Contact Info

Product

Resources

About