Molecular simulation and microtextural characterization of quartz dissolution in sodium hydroxide

Ali, Abdullah Musa; Yahya, Noorhana; Mijinyawa, Abubakar Hamisu; Kwaya, Mohammed Yerima; Sikiru, Surajudeen

doi:10.1007/s13202-020-00940-2

Cited by 30 publications

(12 citation statements)

References 37 publications

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“…The deduction of an effect of kinetics is supported by literature suggesting that the dissolution reaction kinetics of quartz in aqueous solutions may vary with crystallographic orientation (e.g. 32 – 34 . Kennedy 35 found that quartz cut with poles parallel to the c-axis (i.e.…”

Section: Discussionmentioning

confidence: 65%

Surface microstructures developed on polished quartz crystals embedded in wet quartz sand compacted under hydrothermal conditions

Schutjens

Spiers

Niemeijer

2021

Sci Rep

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Intergranular pressure solution plays a key role as a deformation mechanism during diagenesis and in fault sealing and healing. Here, we present microstructural observations following experiments conducted on quartz aggregates under conditions known to favor pressure solution. We conducted two long term experiments in which a quartz crystal with polished faces of known crystallographic orientation was embedded in a matrix of randomly oriented quartz sand grains. For about two months an effective axial stress of 15 MPa was applied in one experiment, and an effective confining pressure of 28 MPa in the second. Loading occurred at 350 °C in the presence of a silica-saturated aqueous solution. In the first experiment, quartz sand grains in contact with polished quartz prism ($$\overline10{1 }0$$ 1 ¯ 010 ) faces became ubiquitously truncated against these faces, without indenting or pitting them. By contrast, numerous sand-grain-shaped pits formed in polished pyramidal ($$17\overline{6 }3$$ 17 6 ¯ 3 ) and ($$\overline{4 }134$$ 4 ¯ 134 ) crystal faces in the second experiment. In addition, four-leaved and (in some cases) three-leafed clover-shaped zones of precipitation formed on these prism faces, in a consistent orientation and pattern around individual pits. The microstructures observed in both experiments were interpreted as evidence for the operation of intergranular pressure solution. The dependence of the observed indentation/truncation microstructures on crystal face orientation can be explained by crystallographic control of stress-induced quartz dissolution kinetics, in line with previously published experimental and petrographic data, or possibly by an effect of contact orientation on the stress-induced driving force for pressure solution. This should be investigated in future experiments, providing data and microstructures which enable further mechanism-based analysis of deformation by pressure solution and the effect of crystallographic control on its kinetics in quartz-rich sands and sandstones.

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Section: Discussionmentioning

confidence: 65%

Surface microstructures developed on polished quartz crystals embedded in wet quartz sand compacted under hydrothermal conditions

Schutjens

Spiers

Niemeijer

2021

Sci Rep

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“…As the pH increases from 8 to 12, the zeta potential of BP decreases from −20.83 mV to −45.17 mV, while that of QP decreases from −33.20 mV to −62.6 mV. In the solution, the silanol groups on the surface of QP undergo the following reactions [ 27 , 28 , 29 ]. ≡SiOH + H 3 O + ↔ ≡SiOH 2 + + H 2 O ≡SiOH + OH − ↔ ≡SiO − + H 2 O …”

Section: Resultsmentioning

confidence: 99%

Effect of Basalt Powder on Hydration, Rheology, and Strength Development of Cement Paste

Che

Liu

et al. 2022

Materials

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Basalt materials (e.g., basalt powder, aggregate, and fiber) are commonly used in cement-based materials. To understand the mechanism of the influence of basalt on the properties of cement-based materials (i.e., fluidity, hydration, and strength), zeta potential tests with different Ca2+ concentrations were carried out using basalt powder (BP). It is found that BP has a weaker absorption for Ca2+ compared to cement and quartz particles, which is directly related to its surface chemical properties. This weak absorption has a significant influence on the rheology and early-age hydration of cement paste. Moreover, the morphology of hydrate on the surface of the material observed by scanning electron microscope (SEM) also shows that the growth of CSH on the surface of BP particles is smaller than that of cement particles, indicating that BP delays the formation of CSH. Rheological tests showed that the reduction of BP’s adsorption of calcium ions weakened the electrostatic repulsion between particles, which led to the reduction of rheological properties. The influence of BP on the strength of cement paste was studied through crack characterization and fracture observation. The results show that the interfacial strength between BP and hydration products is very weak and does not increase with the hydration process, and the chemical reaction of BP is not obvious. In addition, the substitution of BP for cement leads to a dilution effect. These factors cause the strength of cement paste to decrease.

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“…Zhang et al, 2017). The DFT calculations and experimental data clearly show that exposure to NaOH affects the structure and reactivity of quartz (A. M. Ali et al, 2020).…”

Section: Introductionmentioning

confidence: 84%

“…9. When the reaction is controlled by diffusion, the apparent activation energy is in the range of 8 kJ/mol-20 kJ/mol; When the reaction is controlled by chemical reaction, the apparent activation energy is in the range of 40 kJ/mol-300 kJ/mol (Walsh et al, 2000;A. M. Ali et al, 2020).…”

Section: Kinetic Study On Alkali Dissolution Of Quartz By Counterionmentioning

confidence: 99%

Counterion effects on the alkali dissolution mechanism of quartz

Yao¹,

Tang²,

Yang³

et al. 2023

Physicochem. Probl. Miner. Process.

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In gold ore, quartz plays an important role in mineral formation by acting as the follower. Understanding counterion release, transport, and deposition in alkali solution is a prerequisite for evaluating the potential role of gold separate from quartz deposits in pretreatment. In this work, the aggregation, retention, and release of counterion in alkali solution media were investigated by kinetic research and pure mineral experiments, the correlation and mechanism of these processes were revealed by combining geochemical theory, interaction energy calculation, and quantum chemistry. The results showed that the retention and release of counterion were closely related to the dissolution and corrosion rate of quartz. The NH4+ and Fe2+ with higher mineral affinity reduced the quartz stability, and the dispersion stability and mobility of the quartz were greatly improved by an alkaline substance due to the enhancement of steric hindrance effects. Quantum chemical calculation results show that ammonium ion promotes the dissolution of quartz stronger than ferrous ion, which is mainly reflected in reducing the activation energy required for the formation of transition state (TS1), which can be verified by kinetic calculation. These findings provide essential insight into the extraction of gold coated by quartz as well as a vital reference for the experiment of gold-loaded quartz leaching in mineral processing.

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Molecular simulation and microtextural characterization of quartz dissolution in sodium hydroxide

Cited by 30 publications

References 37 publications

Surface microstructures developed on polished quartz crystals embedded in wet quartz sand compacted under hydrothermal conditions

Surface microstructures developed on polished quartz crystals embedded in wet quartz sand compacted under hydrothermal conditions

Effect of Basalt Powder on Hydration, Rheology, and Strength Development of Cement Paste

Counterion effects on the alkali dissolution mechanism of quartz

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