Synthesis, Rietveld refinement and DSC analysis of Al-goethites to support mineralogical quantification of gibbsitic bauxites

Paz, Simone Patrícia Aranha da; Torres, Palomino; Angélica, Rômulo Simões; Kahn, Henrique

doi:10.1007/s10973-016-5987-4

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…Quartz (d 101 = 3.34 Å) may be present in some samples, but in minor content. Hematite (d 104 = 2.69 Å) is observed as the main iron mineral, with intensity varying significantly among the lithologies, and Al-goethite (d 101 ranging from 4.18 Å to 4.14 Å) is also observed, usually as a broad peak due to variations in the isomorphic substitution of Al in the structure [12,34]. Anatese (d 101 = 3.52 Å) is also present in all samples.…”

Section: Xrd Datamentioning

confidence: 90%

A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data

2021

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Available Alumina (AvAl2O3) and Reactive Silica (RxSiO2), the main parameters of bauxite controlled in the beneficiation process are traditionally measured by laborious, expensive, and time-consuming wet chemistry methods. Alternative methods based on XRD analysis, capable to provide a reliable estimation of these parameters and valuable mineralogical information of the ore, are being studied. In this work, X-ray diffraction data in transmission mode was used to estimate AvAl2O3 and RxSiO2 from Brazilian bauxites using the Partial Least Square Regression (PLSR) statistical tool. The proposed method comprises a routine of sample classification according to their similarities by Principal Component Analysis (PCA) and K-means, calibration of the PLSR model for each group of samples, grouping new bauxite samples according to the generated clustering model, and subsequent estimation of the parameters AvAl2O3 and RxSiO2 using the PLSR models for these samples. The results showed good accuracy and precision of the models generated for samples of the main ore lithology. The quality and pre-processing of the XRD data required for this method are discussed. The results demonstrated that this method has the potential to be industrially applied to quality control of bauxites as a rapid and automated procedure.

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Section: Xrd Datamentioning

confidence: 90%

A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data

2021

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“…The applied methodology was based on the study developed by Paz et al (Paz et al, 2017). According to this methodology, the heat of the decarbonation reaction measured by DSC ∼750°C can be used for phase quantification because the ratio between the peak area and the enthalpy can be determined using a temperature-dependent calibration factor.…”

Section: Differential Scanning Calorimetry (Dsc) Combined With Xrd (Pmentioning

confidence: 99%

How to Estimate the Binder: Aggregate Ratio From Lime-Based Historic Mortars for Restoration?

2020

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One of the most important studies from historic mortars is the binder:aggregate ratio, which is usually obtained through wet chemical analysis. Instrumental techniques and benchtop equipment have become increasingly important tools in the characterization of historic materials. The analysis of such materials has become more practical, faster and more accurate, and the sample preparation methods require less and less material. Thus, this article aims to investigate the validity of the results obtained by some of the methods and techniques used in historic materials analysis and determine the possibility of estimating the binder:aggregate ratio with adequate accuracy and precision. For this purpose, historic mortars from Belém do Pará, in northern Brazil, were selected, and the following quantification techniques were employed: wet chemical analysis, XRD, DSC and XRF. The results showed that the amounts of the components in the mortars could be quantified with the use of approximately 3 g of sample, thus providing one of the main pieces of information needed for the production of a restoration mortar: the binder:aggregate ratio.

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Microstructure damage characteristics and its mechanism of undisturbed loess suffering to weak acid leaching

Zhang

Yan²,

Peng³

et al. 2023

Bull Eng Geol Environ

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Synthesis, Rietveld refinement and DSC analysis of Al-goethites to support mineralogical quantification of gibbsitic bauxites

Cited by 9 publications

References 22 publications

A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data

A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data

How to Estimate the Binder: Aggregate Ratio From Lime-Based Historic Mortars for Restoration?

Microstructure damage characteristics and its mechanism of undisturbed loess suffering to weak acid leaching

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