Alteration of trioctahedral micas in the presence of inorganic and organic acids

Cappelli, Chiara; Driessche, Alexander E. S. Van; Cama, Jordi; Huertas, F. Javier

doi:10.1016/j.clay.2023.106923

Cited by 4 publications

(2 citation statements)

References 66 publications

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“…Acid chemical modification is widely studied due to its simplicity of operation and low cost. The mechanism behind the acid chemical modification of silicate minerals involves the dissolution of skeleton elements, such as Si, from the mineral lattice [24][25][26]. There are reported works showing that the wollastonite can be leached and release Si in the presence of inorganic acid [27,28].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Oxalic Acid and Citric Acid on the Modification of Wollastonite Surface

Lin,

Wang,

et al. 2023

Materials

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The modification mechanism of low-molecular-weight organic acids on a single-chain silicate mineral (wollastonite) was investigated through a leaching method. Solid and liquid samples were analyzed using atomic absorption spectrophotometer (AAS), X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier-transform infrared spectroscopy (FTIR). After 720 h of reaction, the results revealed that the dissolution concentration of Si (2200 μmol/L) in citric acid solution is more than that (1950 μmol/L) in oxalic acid. In the composite acids (citric acid and oxalic acid), the dissolution concentration of Si release from wollastonite reached the maximum value of 3304 μmol/L. The dissolution data of Si in wollastonite were fittingly described by the parabolic equation (Ct = a + bt1/2), with the highest correlation coefficients (R2 > 0.993), in the presence of the low-molecular-weight organic acids. The dissolution data suggested that the dissolution reaction process of Si was consistent with the diffusion-controlled model. Citric acid exhibited a higher affinity for attacking the (200) surface, while oxalic acid was prone to dissolve the (002) crystal face. The synergistic effects of oxalic acid and citric acid led to the weakening of the XRD diffraction peak intensity of wollastonite. When exposed to composite acids, the surface of wollastonite was covered with insoluble reactants that restricted the substance diffusion and hindered the reaction. This study offers valuable theoretical insights into the modification or activation of wollastonite by composite low-molecular-weight organic acids.

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Section: Introductionmentioning

confidence: 99%

The Effect of Oxalic Acid and Citric Acid on the Modification of Wollastonite Surface

Lin,

Wang,

et al. 2023

Materials

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“…Acid activation can be divided into two categories: inorganic activation and organic activation. Inorganic acids with high concentrations can dissolve cations in silicate minerals, thereby increasing their reactivity [24][25][26]. However, the concentrated inorganic acids result in high consumption and disposal costs for the waste liquid.…”

Section: Introductionmentioning

confidence: 99%

The Dissolution Mechanism of Low-Molecular-Weight Organic Acids on the Sillimanite

Zhang,

Yu,

Zhong

et al. 2023

Materials

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The interaction between low-molecular-weight organic acids (LMWOAs) and minerals in nature has been widely studied; however, limited research has been conducted on the dissolution mechanism of sillimanite in the presence of different organic acids. In this study, the interaction between the sillimanite sample and LMWOAs (citric acid, oxalic acid, and citric/oxalic mixture) at the same pH was investigated. The dissolution rate of Si and Al was high during the initial reaction time, then slowed down in the presence of LMWOAs. The dissolution data for Si and Al from sillimanite in the LMWOAs fit well with the first-order equation (Ct = a(1 − exp(−kt))) (R2 > 0.991). The dissolution process of sillimanite in the organic acids was controlled by the surface chemical reaction step. The dissolution concentration of Si in aqueous citric acid was higher than that in oxalic acid. In contrast, the dissolution concentration of Al in oxalic acid was more than that in citric acid. The maximum concentrations of Si and Al in the presence of composite organic acids were 1754 μmol/L and 3904 μmol/L. The sillimanite before and after treatment with LMWOAs were studied using X-ray diffraction (XRD) and scan electron microscopy (SEM). These results are explained by the characterization of the sillimanite. Under the single acid solution, the (210) crystal plane with a high areal density of Al in sillimanite was easily dissolved by the oxalic acid, while the (120) in sillimanite with a high areal density of Si was more easily dissolved by citric acid. In the composite organic acids, the Si-O bond and Al-O bond in sillimanite were attacked alternately, leading to the formation of some deeper corrosion pits on the surface of sillimanite. The results are of interest in the dissolution mechanisms of sillimanite in the low-molecular-weight organic acids and the environmentally friendly activation of sillimanite.

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Characteristics and control factors of feldspar dissolution in gravity flow sandstone of Chang 7 Member, Triassic Yanchang Formation, Ordos Basin, NW China

ZHU,

ZHANG,

DONG

et al. 2024

Petroleum Exploration and Development

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Alteration of trioctahedral micas in the presence of inorganic and organic acids

Cited by 4 publications

References 66 publications

The Effect of Oxalic Acid and Citric Acid on the Modification of Wollastonite Surface

The Effect of Oxalic Acid and Citric Acid on the Modification of Wollastonite Surface

The Dissolution Mechanism of Low-Molecular-Weight Organic Acids on the Sillimanite

Characteristics and control factors of feldspar dissolution in gravity flow sandstone of Chang 7 Member, Triassic Yanchang Formation, Ordos Basin, NW China

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