Breakthrough curves of adsorption of a mixture of As(V) and …

The figure shows that the adsorption of As(V) and As(III) increases with the increase in the charred dolomite concentration. Comparing the results with the results of the single-component systems ...

Dissolution enables dolomite crystal growth near …

Dolomite CaMg(CO 3) 2 is a thermodynamically stable carbonate mineral that composes about 30% of the sedimentary carbonate mineralogy in Earth's crust (1–3).Despite its geochemical abundance, nearly two centuries of sustained …

Facile Two-Step Deposition of Calcium Oxalate Film on Dolomite …

The deposition of a calcium oxalate layer on dolomite demonstrates potential application in stone culture heritage conservation. However, due to insufficient coverage and the presence of cracks, the film's usefulness is restricted. In this investigation, we used a simple two-step procedure to create a cohesive and uncracked film. The findings show that the protective …

High-temperature dolomite decomposition: An integrated …

Findings show dolomite porosity decreases with higher temperature and reaction time. Effective thermal conductivity increases with calcination temperature and porosity.

Characterization of adsorption of aqueous arsenite and …

Breakthrough curves for the adsorption of (a) As(V) onto charred dolomite and (b) As(III) onto charred dolomite using microcolumn at different initial arsenic concentrations. Mass of dolomite and ...

(PDF) Estimation of dolomite formation: Dolomite …

Reactive-transport models are developed here that produce dolomite via two scenarios: primary dolomite (no CaCO3 dissolution involved) versus secondary dolomite (dolomitization, involving...

Dolemite is My Name movie review (2019)

Twenty years have passed since Eddie Murphy last used the kind of R-rated profanity he frequently employs in "Dolemite Is My Name," and it's a homecoming of sorts. After decades of comedic PG and PG-13 rated fare, not to mention more dramatic turns like his Oscar-nominated role in "Dreamgirls" and his unwise choice of "Mr. Church," the self-proclaimed …

Hydrophobic dolomite sorbent for oil spill clean-ups: Kinetic …

The external mass transport of sorbate and external film diffusion in this sorption system was very fast in comparison with the intraparticle diffusion and adsorption. ... Comparison of different adsorption reaction models for Bakken oil adsorption onto hydrophobic dolomite at three different concentration (a) 3000 ppm, (b) 5000 ppm, and 7000 ...

Dolomite | Formation, Structure, Properties, Uses, & Facts

dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate [CaMg(CO 3) 2].. General considerations. Along with calcite and aragonite, dolomite makes up approximately 2 percent of the Earth's crust. The bulk of the dolomite constitutes dolostone formations that occur as thick units of great areal extent in …

OPTIMIZATION AND KINETICS STUDIES OF THE DISSOLUTION OF DOLOMITE …

The application of the shrinking core model to the generated data shows that the reaction between dolomite and sulphuric acid is film diffusion control with a first-order reaction (0.6587) and ...

Improving the Tensile and Tear Properties of …

In this work, dolomite filler was introduced into thermoplastic starch (TPS) matrix to form TPS-dolomite (TPS-DOL) biocomposites. TPS-DOL biocomposites were prepared at different dolomite loadings (1 wt%, 2 wt%, 3 …

The effects of magnesium concentration in high …

Here we demonstrate a 200% increase in dolomite concentration in living CCA under greenhouse conditions of high pCO2 (1,225 μatm) and warming (30 °C). Aragonite, in contrast, increases with ...

Improving the Tensile and Tear Properties of Thermoplastic …

Although the peak location of starch does not change obviously in the XRD pattern, the intensities increased significantly due the addition of dolomite into the TPS film (refer to the diffraction peaks 2θ at around 22° for TPS film and TPS-5wt%DOL(P)) film. The degree of crystallinity of the TPS film was increased from 25.38% to 51.79% when ...

(PDF) Kinetics and Mechanism of Dolomite Dissolution in …

PDF | Steady-state dissolution rates of dolomite were measured at 25°C in a mixed-flow reactor as a function of pH (from 5-12), ionic strength (0.002 <... | Find, read and cite all the research ...

Facile Two-Step Deposition of Calcium Oxalate Film on …

In this investigation, we used a simple two-step procedure to create a cohesive and uncracked film. The findings show that the protective layer provides better coverage of the …

Precise determination of dolomite content in marine sediments

This study demonstrates that Fourier Transform Infrared Spectrophotometry (FTIR) provides a quick and relatively inexpensive method for identifying and quantifying dolomite in deep marine...

Precise determination of dolomite content in marine …

Dolomite is a carbonate mineral with the formula CaMg(CO 3) 2.Although it is very abundant in sedimentary records worldwide, its distribution in those records as well as its mechanisms of formation have been puzzling geochemists for more than 100 years, making "the dolomite problem" a long-standing enigma (Daly 1909; Vinogradov and Ronov 1957; Land …

Magnesium Ions Direct the Solid‐State Transformation of …

Amorphous calcium carbonate (ACC) is a common precursor to crystalline calcium carbonate, and is of particular importance in biomineralization, where its crystallization in privileged environments ensures a pseudomorphic transformation. While organisms regulate this process using organic molecules and magnesium ions to selectively form calcite or aragonite, …

Dolostone (Dolomite) : Properties, Formation, Occurrence, …

Dolomite is a mineral and a rock-forming mineral that is composed of calcium magnesium carbonate (CaMg(CO3)2). It is named after the French mineralogist Déodat Gratet de Dolomieu, who first described its properties in the late 18th century. Dolomite is often found in sedimentary rock formations and can occur in a variety of colors, ranging from white to gray, …

(PDF) Kinetic Analysis of Dolomite Ore Reaction with HNO3

Effect of concentration on the fraction of dolomite that reacted was studied between 0.5 and 2.5 M while the temperature was kept constant at 55 °C based on the preliminary experiment. ... The heterogeneous reaction between dolomite and HNO 3 involves three steps: 1. Film diffusion control: this involves the migration of liquid film around ...

Magnesium Ions Direct the Solid‐State Transformation …

Magnesium-Calcite, or Dolomite Shuheng Zhang, Ouassef Nahi, Li Chen, Zabeada Aslam, Nikil Kapur, Yi-Yeoun Kim, and Fiona C. Meldrum* Amorphous calcium carbonate (ACC) is a common precursor to crystalline ... the ACC films scaled with the concentrations of the Mg2+ ions

Separating dolomite from phosphate rock by reactive …

This study investigated the feasibility of using dolomite–a common sedimentary rock–from Padalarang, West Java, Indonesia as the adsorbent for the removal of phosphate from synthetic aqueous solution. Chemical analysis revealed that the …

Dolemite Is My Name (2019)

Dolemite Is My Name: Directed by Craig Brewer. With Eddie Murphy, Keegan-Michael Key, Mike Epps, Craig Robinson. Eddie Murphy portrays real-life legend Rudy Ray Moore, a comedy and rap pioneer who proved naysayers wrong when his hilarious, obscene, kung-fu fighting alter ego, Dolemite, became a 1970s Blaxploitation phenomenon.

Self-accelerating volumetric dolomite-for-calcite replacement…

Changes in Ca 2+ and Mg 2+ concentrations, and in dolomitization reaction rates within an individual "pulse" of brine solution during the volumetric dolomitization of limestone, as postulated by Merino and Canals ().The schematic dissolution porosity (red line), rate of dolomite-for calcite replacement (R dolo —dashed blue line), the concentrations of Mg (Mg1 and …

Thermal behavior of natural dolomite | Journal of Thermal

The thermodynamic analysis of the thermal decomposition reaction of carbonates showed that the temperatures of thermal stability of dolomite and magnesium carbonate are very similar. Kinetics of isothermal and non-isothermal decompositions of natural dolomite in air atmosphere were investigated. Under the examined conditions, dolomite decomposed in a one …

Reactivity of dolomite in water-saturated supercritical carbon dioxide

A thin film of water (a few nanometer thick) develops on the surface of minerals in contact with H 2 O-undersaturated as well as H 2 O-saturated supercritical carbon dioxide [33], [35]. In addition, dolomite has been found to exhibit hydrophilic surfaces [43] under mixed [44] or oil wet [45] conditions.

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Respiratory disorders associated with heavy inhalation …

The size of the film was 35×35 cm, the distance of the subjects from the X-ray tube was about six feet and the electrical voltage was 100 KV. Data analysis . ... Airborne concentration of dolomite dust was far beyond its current TLV of 10 mg/m3 . Therefore, it would be reasonable to attribute the prevalence of respiratory symptoms in exposed ...

Chemical formula and composition of dolomite

In conclusion, while these data cast doubt on the notion that dolomite is a harmless chemical, they provide evidence in favour of the proposition that exposure to high atmospheric concentrations ...

(PDF) Magnesium Ions Direct the Solid‐State

A) Bright‐field TEM image and B) corresponding SAED pattern of a single crystal domain in dolomite film generated from ACC films prepared at [Ca²⁺] = 10 × 10⁻³ m and [Mg²⁺] = 100 × 10 ...

Evaluating the role of dissolved silica for dolomite formation …

Our results revealed a positive correlation (p-value <0.001) between Si concentration in solution and the mol% Mg of the carbonate minerals forming in the …