Thermal treatment of a potassium-rich metamorphic rock in formation of soluble K forms

Santos, Wedisson Oliveira; Mattiello, Edson Márcio; Pacheco, Anderson Almeida; Vergütz, Leonardus; Souza-Filho, Luiz Francisco da Silva; Abdala, Dalton Belchior

doi:10.1016/j.minpro.2016.12.004

Cited by 22 publications

(16 citation statements)

References 14 publications

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“…The loss of water was confirmed by colour changes of hydrated CoCl 2 before/ after measurements (Ward et al 2016). The spectra of anhydrous KCl and K 2 SiO 3 are much less smooth than the spectra reported in Santos et al (2017), which may be explained by their highly ordered structures.…”

Section: Chemical Compoundsmentioning

confidence: 69%

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Liu

2020

Geostandard Geoanalytic Res

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Potassium (K) and calcium (Ca) K-edge X-ray adsorption near-edge (XANES) spectroscopy were performed on thirty-three chemical compounds and geological materials, including chemical reagents, organometallic compounds, silicates, carbonates and igneous rock reference materials. The results confirm that the fine structure of the K-edges for specimens is unique and distinguishable. The results suggest that compositional and local atomic variations strongly regulate spectral characteristics. Acquired XANES spectra with the library of distinctive spectral features of model references approve the fingerprint identification of different phases of K and Ca involved in geological materials. Moreover, this reveals that typical compositional changes in geological samples could strongly affect spectral features. As an example, we quantitatively determined the silicate species of K and Ca in two igneous rock reference materials by linear combination fitting. The dominant hosts and molecular environments of K and Ca can be interpreted based on pre-edge/post-edge peak position, intensity, shifts and resonance features, thus improving the understanding of the (bio)geochemical cycling, partitioning and isotopic fractionation of K and Ca. The outcomes serve as a complementary database for a vast number of scientific contexts, including aspects of geological and environment sciences.

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Section: Chemical Compoundsmentioning

confidence: 69%

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Liu

2020

Geostandard Geoanalytic Res

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“…Three new structures were formed: anorthite (CaAl2Si2O8), hematite (Fe2O3) and sylvite (KCl). Diffraction lines of anorthite (at 22°, 27.9°, 30.4°) and sylvite (at 28.4° and 40.5°) were also observed elsewhere (Santos et al, 2017) after calcination of Verdete with CaCl2•2H2O at 973 and 1173 K. Jena et al (2016) also observed the presence of sylvite and anorthite after calcination of feldspar with CaSO4 and NaCl. The salts reacted to form Na2SO4 and CaCl2, and the latter melted at around 775 °C and consumed part of the feldspar structure, generating the previously mentioned crystalline phases.…”

Section: Calcination Of Verdete With Mgcl2 and Cacl2mentioning

confidence: 76%

Feasibility of concentrating potassium minerals from Verdete ore by cell flotation

Cordeiro

Oliveira

et al. 2021

jCEC

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A silicate ore with K2O content above 10%, found in the central region of Minas Gerais (Brazil), called Verdete, was floated in flotation cell. The goal was to evaluate the flotation behaviour of the ore constituents (glauconite, muscovite, K-feldspar and quartz) relative to the use of different collectors (fatty acid soap obtained from rice oil, amine and oleic acid) and depressors (gelatinized cornstarch and sodium silicate). Flotation of the calcination products of Verdete with MgCl2 and CaCl2 were also evaluated. Mass recovery of flotation carried out with Verdete reached a maximum of 53% when amine and sodium silicate were used as collector and depressant, respectively. Mass recovery was directly proportional to collector dosage, and was also influenced by the type of depressor. Calcination of Verdete with MgCl2?xH2O partially consumed the micas and generated MgO. Flotation of this calcination product concentrated MgO in the floated fraction, reaching 93% when oleic acid was used as collector.

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“… 2 − 5 Potassium feldspar (K-feldspar), which occurs in ultrapotassic syenite in high concentration (∼85 wt % corresponding to ∼14.3 wt % K 2 O), 6 is the most abundant K-bearing mineral. However, its low solubility of K + in water solution 7 remains a major challenge associated with the processing of K-feldspar. This consequently has led to the development of different methods including acid leaching, hydrothermal alkali decomposition, 8 − 17 and thermal decomposition 3 , 7 , 18 − 28 for improving K + exchange and converting an insoluble potassium resource into a soluble form.…”

Section: Introductionmentioning

confidence: 99%

Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using NaCl–CaCl₂ Salt Mixture

et al. 2020

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This kinetic experimental analysis reports on the application of a eutectic NaCl–CaCl 2 salt system for the extraction of potassium from ultrapotassic microsyenite. The reaction parameters, time, temperature, salt composition, and salt to ore ratio, were systematically analyzed. It was found that a salt mixture increases the potassium cation extraction in comparison with using either pure NaCl or pure CaCl 2 . It was also found that adding CaCl 2 into pure NaCl has a considerably stronger effect on increasing the potassium recovery than adding NaCl to pure CaCl 2 . The salt as a melting agent offers a reduction in the reaction temperature due to its lower melting temperature when compared to pure salts (NaCl or CaCl 2 ). Approximately 70% of K + in the deposit was extracted at 650 °C. Different characteristic methods have been used to understand the reaction mechanism of the salt mixture and ore, as well as to qualify and quantify the end product mineral phases.

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Thermal treatment of a potassium-rich metamorphic rock in formation of soluble K forms

Cited by 22 publications

References 14 publications

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Feasibility of concentrating potassium minerals from Verdete ore by cell flotation

Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using NaCl–CaCl₂ Salt Mixture

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Thermal treatment of a potassium-rich metamorphic rock in formation of soluble K forms

Cited by 22 publications

References 14 publications

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Potassium and Calcium K‐Edge XANES in Chemical Compounds and Minerals: Implications for Geological Phase Identification

Feasibility of concentrating potassium minerals from Verdete ore by cell flotation

Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using NaCl–CaCl2 Salt Mixture

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Experimental Kinetic Analysis of Potassium Extraction from Ultrapotassic Syenite Using NaCl–CaCl₂ Salt Mixture