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Replacement of calcite (CaCO 3 ) by cerussite (PbCO 3 ) | …

X-ray diffraction results on similar samples also show that calcite is the only CaCO 3 ... The process offered a new path for the treatment of abandoned lead paste based on the conversion of PbSO4 ...

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Current CaCO3 dissolution at the seafloor caused by …

 · ocean acidification seafloor CaCO 3 dissolution anthropogenic CO 2 Seafloor dissolution of CaCO 3 minerals will constitute a primary feedback to ocean acidification over timescales of centuries to tens of millennia ().The overall dissolution reaction is as follows: CaCO 3 + CO 2 + H 2 O → Ca 2 + + 2 HCO 3 −, [1] where CaCO 3 denotes solid carbonate in bottom sediments, mainly as calcite.

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The free energy density of a crystal: calcite (CaCO 3 ) as a …

The model was applied to the (10.4) (twinned and untwinned), (10.0) and (01.2) slabs of calcite (CaCO 3): their free energy density profiles were calculated, as well as their surface/interface free energies.

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Effect of low-temperature plasma treatment of electrospun …

2-plasma treatment of the PCL scaffold caused CaCO 3 to nucleate and precipitate much deeper inside the porous structure. From our findings, we conclude that O 2-plasma treatment is preferable for PCL scaffold surface modification from the viewpoint of use 3

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GEOL 414/514 CARBONATE CHEMISTRY

1 GEOL 414/514 CARBONATE CHEMISTRY Chapter 6 LANGMUIR SOLUBILITY OF CALCITE • CaCO 3 in nature: calcite & aragonite • Reaction with strong acid: CaCO 3 + 2H+ Ca+2 + H 2O + CO 2 • Reaction with weak acid: CaCO 3 + +H+ Ca 2 + HCO 3-• Summary of reaction in nature:

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Calcium Carbonate, Calcite (CaCO 3 )

Calcium Carbonate, Calcite (CaCO 3) Categories: Ceramic Material Notes: CAS Number: 471-34-1 Physical Form: White Hexagonal Crystals or Powder Natural Occurrence: Limestones, dolomites, marbles. Solubility of all carbonates rises rapidly ...

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Calcite Mineral | Uses and Properties

Calcite is a rock-forming mineral with a chemical formula of CaCO 3. It is extremely common and found throughout the world in sedimentary, metamorphic, and igneous rocks. Some geologists consider it to be a "ubiquitous mineral" - one that is found everywhere.

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The Use of Polymers to Improve Control of Calcium Carbonate …

3 the Analyst Volume 13 Number 2Phosphonate Performance Figure 2 presents typical NaOH uptake vs. time profiles for experiments that were conducted in CaCO 3 super-saturated solutions (calcite saturation at 180x) containing 0, 5, 20, and 40 mg/L HEDP. As

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Calcium Carbonate Precipitation in the Presence of Inhibitors, …

method. The CaCO 3 solids collected on the membrane fi lters were analyzed by Precipitation of CaCO 3 at several calcite supersaturations. Effect of phosphonate concentration on CaCO 3 inhibition at 180X calcite saturation. OOctober 2007 MP dd 43ctober

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Properties of molten CaCO 3 at high pressure

 · Redfern, S.A.T., Angel, R.J. (1999) High-pressure behaviour and equation of state of calcite, CaCO 3. Contributions to Mineralogy and Petrology 134, 102-106. ). Compared to silicate melts (), molten CaCO 3 is less compressible than basalt (Sakamaki et al., 2006

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Effect of CaCO 3(S) Nucleation Modes on Algae Removal …

The role of calcite heterogeneous nucleation was studied in a particle-coagulation treatment process for removing microalgae from water. Batch experiments were conducted with Scenedesmus sp. and Chlorella sp. in the presence and absence of carbonate and in the presence and absence of magnesium to delineate the role of CaCO 3(S) nucleation on microalgae removal.

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Seeing Double – Calcite | Crystallography365

 · Calcite is the most common mineral form of calcium carbonate, CaCO 3. It is commonly found in sedimentary rocks and forms the primary component of marble as well as the shells of many marine creatures such as plankton and oysters. Calcite crystals can take many forms; however one very specific type, Iceland spar has played a very important role ...

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Reducing Formation of CaCO3 Scales of Groundwater by Magnetic Treatment

Reducing Formation of CaCO 3 Scales of Groundwater by Magnetic Treatment MA Tantawy, Abdulaziz A Alomari, HMA Alghamdi, RSA Alzahrani …

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Synthesis and Characterisation of CaCO3 (Calcite) Nano …

treatment ensured completion of the reaction. This limited the morphology of the particle to calcite, and had high energy consumption. Mechanical milling causes irregularities in particle shape and distribution. Liu et al. prepared nanosized CaCO 3 3

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Harnessing microbially induced calcite precipitates to use in …

reagent solution (CRS) was applied to trigger calcite (CaCO 3) precipitates. The submerged and surface per-colation treatment methods were carried out in sand using CRS as the treatment solution. The treatment solution was maintained in an alkaline range (pH

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Replacement of Calcite (CaCO 3 ) by Cerussite (PbCO 3 )

Here, we report a study of the bulk transformation of single-crystal calcite (CaCO<sub>3</sub>) into polycrystalline cerussite (PbCO<sub>3</sub>) through reaction with acidic Pb-bearing solutions. This reaction began with the growth of a cerussite shell on top of calcite surfaces followed by the replacement of the remaining calcite core.

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Mineralogy of Calcium Carbonate in MICP-Treated Soil …

 · Treatment method can have a significant influence on the mineralogy of the precipitated calcium carbonate (CaCO 3) in soil treated by microbially-induced carbonate precipitation (MICP).Rhombohedral calcite crystals are the most desirable form of CaCO 3 for geotechnical applications due to their thermodynamically stable nature. . However, not all treatment methods …

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Formations of calcium carbonate minerals by bacteria …

 · Biomineralization can lead to produce different phases of CaCO 3 anhydrous polymorphs such as calcite, aragonite and vaterite, as well as hydrated crystalline phases such as monohydrocalcite (CaCO 3 ·H 2 O) and hexahydrocalcite or ikaite (CaCO 3 ·6H 2 O) and amorphous calcium carbonate (ACC) (Krumbein 1979; Hammes et al. 2003a; Wei et al. 2003; Ben Chekroun et al. 2004; Xu et al. …

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Mineralogy of calcium carbonate in MICP-treated soil using …

Treatment method can have a significant influence on the mineralogy of the precipitated calcium carbonate (CaCO 3) in soil treated by microbially-induced carbonate precipitation (MICP). Rhombohedral calcite crystals are the most desirable form of CaCO 3

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Characterization of CaCO Nanoparticles Synthesized by Reverse Microemulsion Technique in Different Concentrations …

the calcite (CaCO 3) is an indirect gap material [(5.60 eV (30 wt.% surfactant), 5.40 eV (36 wt.% surfactant) ... Surface modification of CaCO 3 nano-particles Surface-treatment of CaCO 3 particles is done to improve the fluidity and dispersion of the filler Surface ...

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Anomalous transformation of calcite to vaterite: Significance of …

Phase transformation of calcite to vaterite in the presence of N-(2-hydroxy ethyl) ethylenediamine- N, N, N1- triacetic acid (HEDTA) is reported. The effect of HEDTA on the crystallization behavior and polymorphism of CaCO 3 are studied at different temperatures

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Recovery of Calcium Carbonate from Wastewater Treatment …

and CaCO 3 on the surface [15]. The aim of this study was to recover calcium carbonate which was used after treatment of acid mine water from the sludge. Flotation was selected as a feasible technique to recover the CaCO 3 from the waste sludge.

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Synthesis of CaCO3 Nanoparticles by Mechanochemical …

The synthesis of calcite (CaCO 3) nanoparticles by mechanochemical reaction and subsequent heat treatment was investigated. A solid-state displacement reaction CaCl 2 + Na 2 CO 3 → CaCO 3 +2NaCl was induced during mechanical milling of a CaCl 2 + Na 2 CO 3 powder mixture. Heat treatment of the as-milled powder at 350°C completed the reaction, ...

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(PDF) Design aspects of calcite-dissolution reactors …

Design aspects of calcite-dissolution reactors applied for post treatment of desalinated water Desalination, 2013 Ori Lahav Liat Birnhack Orly Lehmann Ori Lahav Liat Birnhack Orly Lehmann Download PDF Download Full PDF Package This paper A short 37 Full ...

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adsorbed to CaCO

CaCO 3 precipitation under high calcite saturation, these phosphonates need to be blended with high performance scale inhibitors and dispersants in order to prevent their precipitation with calcium ions. To study the effect of phosphonates on calcium carbonate ...

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Passive Treatment of Acid Mine Drainage with Limestone …

 · At the current rates of calcite solubilization, 17.9 kg d −1 CaCO 3 at Howe Bridge and 2.7 kg d −1 CaCO 3 at Morrison, the ALDs have theoretical effective lifetimes in excess of 20 yr. By significantly increasing alkalinity concentrations in the mine waters, both ALDs increased metal removal in downstream constructed wetlands.

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(PDF) Development of an additional step to current CO2 …

Academia is a platform for academics to share research papers. Development of an additional step to current CO2-based CaCO3(s) dissolution post-treatment processes for cost-effective Mg2+ supply to desalinated water

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Use of the Langmuir method for kinetic studies of …

The Langmuir method for measurement of vapour pressures has been tested for use in studies of decomposition reactions. The isothermal weight loss in vacuum from cleavage (101) planes of calcite (CaCO) single crystals was measured continuously at

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Crystallographic Control in the Replacement of Calcite by Calcium …

Crystallographic Control in the Replacement of Calcite by Calcium Sulfates Encarnacion Ruiz-Agudo,*,† Pedro Álvarez-Lloret,‡ Aurelia Ibañez-Velasco,† and Miguel Ortega-Huertas† †Department of Mineralogy and Petrology, University of Granada, Fuentenueva s/n, 18002 Granada, Spain ...

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Experimental investigations of preparation of calcite particles by ultrasonic treatment

Experimental investigations of preparation of calcite particles by ultrasonic treatment 861 Table 1. Chemical composition of calcite used (wt.%) CaCO 3 >99.6 MgCO 3 <0.20 Fe 2 O 3 <0.01 SiO 2 <0.01 Al 2 O 3 <0.02 HCl insoluble content <0.01 Table 2. Selected

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Comparison of the effect of reactive and nonreactive …

 · Coating calcite (CaCO 3) with dispersants is called a nonreactive treatment. The surface modification of CaCO 3 with coupling agents is called reactive treatment. In this study, physical, chemical, morphological, rheological, and mechanical analyses were conducted to determine the effect of reactive and nonreactive surface treatment agents on the dispersion of CaCO 3 in polypropylene/CaCO 3 …

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Hydrothermal conversion of calcite crystals to …

 · High intensity peaks of unreacted CaCO 3 identified as calcite phase show that a lower temperature (80 C in Fig. 1a) and lower PO 4 concentration were not sufficient to convert to HAp. It was observed that large grains of calcite were difficult to completely convert at low temperatures; thus, a long reaction period was required for the complete formation of HAp as shown in Fig. 3 .

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Post-Treatment of Desalinated Water—Chemistry, Design, …

 · Low pH values prevail, for example, in water pumped into calcite (CaCO 3) dissolution reactors. Similarly, at the range 7.5 < pH < 9.5, the dominant species is HCO 3 −. This is usually the case in the product water of a desalination plant, following the PT step. .

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