An experimental study of the dissolution mechanism and rates of muscovite

Oelkers, Eric H.; Schott, Jacques; Gauthier, Jean-Marie; Herrero-Roncal, Teresa

doi:10.1016/j.gca.2008.01.040

Cited by 125 publications

(76 citation statements)

References 53 publications

(56 reference statements)

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“…Muscovite dissolution in a high-temperature environment has also been reported [13]. Oelkers [14] found that dissolution rates at higher temperatures (333 K-474 K) and broad pH ranges (1-10.3) are functions of K, Si, and Al concentrations in reactive solutions. However, these studies were performed in low-alkaline conditions, …”

Section: Introductionmentioning

confidence: 64%

“…Characteristic diffraction peaks of unreacted sericite, such as (002), (004), (006) and (008), were observed after the alkali leaching process. Characteristic diffraction peaks of the aluminosilicate phase were detected in the alkali-leached residue when the alkali leaching temperature was 513 K. At 513 K, hydroxycancrinite (Na 14 4.02 , JCPDS 70-5029) were detected. Alkali-leached residues treated with different NaOH concentrations and leaching times were also analyzed by XRD.…”

Section: Xrd Analysis Of Alkali-leached Residuementioning

confidence: 99%

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Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

et al. 2017

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Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated. The dissolution of sericite was mainly affected by alkali leaching temperature, sodium hydroxide concentration, and alkali leaching time. According to the XRD, FTIR, and SEM-EDS analyses, the dissolution mechanism of sericite is a three-stage process: (1) sericite is dissolved in the form of soluble silicate and aluminate; (2) the dissolved silicate and aluminate then react with each other to form aluminosilicate; and (3) finally the aluminosilicate mainly composed of hydroxycancrinite and sodalite is almost completely dissolved in the hydrochloric acid solution.

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Section: Introductionmentioning

confidence: 64%

Section: Xrd Analysis Of Alkali-leached Residuementioning

confidence: 99%

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

et al. 2017

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“…Results are unreplicated; that is, only one sample was analysed for each time and temperature combination. This is common in mineral dissolution and precipitation studies where reaction rates are studied in response to variables, such as temperature or pH [17,22,[27][28][29][30][31][32][33][34]] to derive reaction kinetics. A single time and temperature combination in the pressure vessel experiments (100 °C, 909 h) was conducted in triplicate to estimate variability; this approach has also been used elsewhere [35].…”

Section: Methodsmentioning

confidence: 99%

“…All XRD patterns were collected from powders or slurries that were rotated during collection of XRD patterns; preferred orientation is therefore unlikely to cause changes in peak areas between patterns. Muscovite has been observed to dissolve under alkaline conditions [28,31], although dissolution rates decrease as aqueous Al and Si concentrations increase [32]. The minor dissolution observed in fused silica capillary experiments at 165-170 °C may be due to decreases in aqueous Al in supernatant solution at temperatures ≥165 °C (Figure 2).…”

Section: Solids Mineralogymentioning

confidence: 99%

Experimental Simulation of Long Term Weathering in Alkaline Bauxite Residue Tailings

Santini

Fey

Gilkes

2015

Metals

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Abstract:Bauxite residue is an alkaline, saline tailings material generated as a byproduct of the Bayer process used for alumina refining. Developing effective plans for the long term management of potential environmental impacts associated with storage of these tailings is dependent on understanding how the chemical and mineralogical properties of the tailings will change during weathering and transformation into a soil-like material. Hydrothermal treatment of bauxite residue was used to compress geological weathering timescales and examine potential mineral transformations during weathering. Gibbsite was rapidly converted to boehmite; this transformation was examined with in situ synchrotron XRD. Goethite, hematite, and calcite all precipitated over longer weathering timeframes, while tricalcium aluminate dissolved. pH, total alkalinity, and salinity (electrical conductivity) all decreased during weathering despite these experiments being performed under "closed" conditions (i.e., no leaching). This indicates the potential for auto-attenuation of the high alkalinity and salinity that presents challenges for long term environmental management, and suggests that management requirements will decrease during weathering as a result of these mineral transformations. OPEN ACCESSMetals 2015, 5 1242

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“…In the initial stage of mineral dissolution, the rates of surface complexation reactions increase with the increased concentration of protons (acidic conditions) and some ligands as well as under alkaline conditions (OH -groups) (Sokolova, 2013), with the minimum dissolution at pH values near the zero point of charge (pH ppzc ) from minerals (e.g., some oxides and aluminosilicates) (Oelkers et al, 2008;Rozalén et al, 2008;White, 2008).…”

Section: Extractants and K Solubilizationmentioning

confidence: 99%

<b>Extractant efficiency in the solubilization of alternative sources of potassium

et al. 2016

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ABSTRACT. Knowledge of a rock's composition allows for inferences regarding several properties, ranging from its physical characteristics to its solubility. This study aimed to evaluate the use of different extractants to solubilize the K present in rocks as a potential source of nutrients and the effects of extractant contact time and temperature on rock solubilization. Samples of two rocks and a mineral concentrated from a granitic rock were treated with ammonium dihydrogen phosphate (NH 4 (H 2 PO 4 )), calcium dihydrogen phosphate (Ca(H 2 PO 4 ) 2 ), sodium hydroxide (NaOH) and water (control). Sample-extractant treatments were performed using a water bath shaker at temperatures of 25 and 50°C for periods of 3, 7, 10, 20, and 30 days. The amounts of K extracted from rocks using the extractants were in the following order: NH 4 H 2 PO 4 >Ca(HPO 4 ) 2 >NaOH>water. The sequence of K release (ppm) based on the rocks studied was as follows: nepheline syenite>green banded argillite>concentrated biotite. Increasing the extractant contact time and temperature enhanced the solubilized K content.Keywords: minerals, soluble K, fertilizers, powdered rock.Eficiência de extratores na solubilização de fontes alternativas de potássio RESUMO. O conhecimento da mineralogia de rochas permite conclusões sobre propriedades que vão desde suas características físicas até a facilidade de solubilização. O objetivo do presente estudo foi avaliar o uso de diferentes extratores na solubilização do potássio (K) presente em rochas potenciais fontes de nutrientes e os efeitos do tempo de contato dos extratores e temperatura na solubilização das rochas. Amostras de rochas e mineral concentrado de rocha granítica foram tratadas com di-hidrogenofosfato de amônio (NH 4 (H 2 PO 4 )), di-hidrogenofosfato de cálcio (Ca(H 2 PO 4 ) 2 ), hidróxido de sódio (NaOH) e água (controle). Os tratamentos rochas-extratores foram submetidos ao banho de agitação em água a temperaturas de 25 e 50°C durante períodos de 3, 7, 10, 20, e 30 dias. As quantidades de K extraídos de rochas usando os extratores foram na seguinte ordem: NH 4 H 2 PO 4 > Ca(H 2 PO 4 ) 2 > NaOH> água. A sequência de solubilização de potássio (ppm) baseado nas rochas estudadas foi a seguinte: nefelina sienito> argilito verde bandado>concentrado de biotita. O tempo de contato dos extratores e temperatura aumentaram o conteúdo de K solubilizado.Palavras-chave: minerais, K solúvel, fertilizantes, pó de rocha.

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An experimental study of the dissolution mechanism and rates of muscovite

Cited by 125 publications

References 53 publications

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

Experimental Simulation of Long Term Weathering in Alkaline Bauxite Residue Tailings

<b>Extractant efficiency in the solubilization of alternative sources of potassium

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