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US6036933A - Calcium carbonate precipitation method ...

A method for producing precipitated calcium carbonate by reacting an aqueous solution of calcium nitrate [Ca(NO 3 ) 2 ] with an aqueous solution of ammonium carbonate [(NH 4 ) 2 CO 3 ] and allowing calcium carbonate to precipitate from the resultant mixture containing nitrate [NH 4 NO 3 ] in the mother liquor, the process being characterized in that: (i) the calcium nitrate [Ca(NO 3 ) 2 ...

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Precipitated Calcium Carbonate (PCC) | Minerals ...

Effect of pH and Phosphate on Calcium Carbonate .

affect ikaite precipitation under the condition representative for sea ice. It was shown that ikaite is very likely the only calcium carbonate polymorph precipitated in sea ice, even though ikaite is a metastable form of calcium carbonate. In the current study we focus on the mechanism of calcium carbonate .

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water treatment - the calcium-carbonate balance - Degremont®

Carbonate calcium potential precipitation (CCPP) is an interesting parameter for quantifying what may be scale-forming or may have dissolving properties (pipes made from concrete) knowing that the CCPP is a level of concentration expressed in CaCO 3 (positive if water .

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Precipitated Calcium Carbonate | Mississippi Lime

Precipitated calcium carbonate is one of the most versatile chemicals used in the modern paint/coatings, ink and paper making markets today. PCC is a cost-effective material used to improve the physical characteristics of finished products.

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Calcium Sulfate and Calcium Carbonate Simple and Mixed ...

Aug 01, 2014 · Xyla AG, Mikroyannidis J, Koutsoukos PG (1992) The inhibition of calcium carbonate precipitation in aqueous Media by organophosphorus compounds. J Coll. Inter. Sci. 153: 537-551. Zarga Y, Bendoubaker H, Ghaffour N, Elfil H (2013). Study of calcium carbonate and sulfate co-precipitation. Chemical Engineering Science 96 : 33-41.

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Strain-Specific Ureolytic Microbial Calcium Carbonate ...

During a study of ureolytic microbial calcium carbonate (CaCO3) precipitation by bacterial isolates collected from different environmental samples, morphological differences were observed in the large CaCO3 crystal aggregates precipitated within bacterial colonies grown on agar. Based on these differences, 12 isolates were selected for further study.

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Precipitated Calcium Carbonate from Limestone - Chemical ...

The process flow diagram shows precipitated calcium carbonate (PCC) production from limestone[/caption] Calcination. Initially, the limestone from a quarry is stored in bins. Typical extracted limestone contains about 75 wt.% of CaCO3. Mined limestone is crushed in a jaw crusher and calcined (burned) in a vertical-shaft lime kiln at about 1,000°C.

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Calcium carbonate - Wikipedia

The carbonate compensation depth (CCD) is the point in the ocean where the rate of precipitation of calcium carbonate is balanced by the rate of dissolution due to the conditions present. Deep in the ocean, the temperature drops and pressure increases. Calcium carbonate is unusual in that its solubility increases with decreasing temperature.

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Re: CCPP calculation using the PHREEQC program

Sep 19, 2002 · > Metropolitan has been using the USGS program to calculate saturation index (SI) for our waters. According to the "Standard Methods for the Examination of Water and Wastewater", this program also calculates the calcium carbonate precipitation potential (CCPP) which predicts the quantity of calcium carbonate that may precipitate or dissolve in a given water.

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Precipitated Calcium Carbonate - Drugs

Calcium carbonate (CaC03) is a common additive in pharmaceutical industry. It can be used a color additive, and is a fine, white, synthetically prepared powder consisting essentially of precipitated calcium carbonate (CaCO3).

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CORROSION CONTROL: Using Caustic Soda to Control Corrosion ...

When the concentrations of calcium and carbonate ions exceed the solubility product, calcium carbonate precipitate is formed. Therefore, if lime is added indiscriminately, the result can be excessive amounts of calcium carbonate precipitation in post treatment storage .

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Home - Imerys Carbonates

SOCAL® UP:. Imerys Carbonates' unique, ultra-fine Precipitated Calcium Carbonate "SOCAL® UP" is a true alternative to TiO2 in many matt architectural paints, providing significant cost savings and drastic reduction of carbon foot print.

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Calcium Sulfate and Calcium Carbonate Simple and Mixed ...

Xyla AG, Mikroyannidis J, Koutsoukos PG (1992) The inhibition of calcium carbonate precipitation in aqueous Media by organophosphorus compounds. J Coll. Inter. Sci. 153: 537-551. Zarga Y, Bendoubaker H, Ghaffour N, Elfil H (2013). Study of calcium carbonate and sulfate co-precipitation. Chemical Engineering Science 96 : 33-41.

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ACKNOWLEDGMENTS - [email protected]

should precipitate or dissolve calcium carbonate in a closed system. His saturation index was computed by subtracting the pH that the water would have at equilibrium with calcium carbonate, (pHc)' from the actual pH of the water, (pHa). Saturation Index Negative values indicate that the water will dissolve calcium carbonat e

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water treatment - the calcium-carbonate balance - Degremont®

Carbonate calcium potential precipitation (CCPP) is an interesting parameter for quantifying what may be scale-forming or may have dissolving properties (pipes made from concrete) knowing that the CCPP is a level of concentration expressed in CaCO 3 (positive if water .

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Assessment of calculation methods for calcium carbonate ...

A practical parameter that is associated with the calcium carbonate saturation is the Calcium Carbonate Precipitation Potential (CCPP) (Standard Methods 2330, 2010), which is a generally used measure for the amount of calcium carbonate which theoretically can precipitate. SI and CCPP are positive for oversaturated water, zero for

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Calcium carbonate precipitation catalyzed by soybean ...

Calcium carbonate precipitation catalyzed by soybean urease as an improvement method for fine-grained soil Author links open overlay panel Yufeng Gao a Jia He a Xinyi Tang a Jian Chu b Show more

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Formations of calcium carbonate minerals by bacteria and ...

Mar 01, 2016 · The calcium carbonate (CaCO 3) precipitation process is a straightforward and easily controllable mechanism of MICP that can produce high concentrations of CaCO 3 in short period of time (Dhami et al. 2013a).Urease influences the chemical process associated with the formation of biominerals through four different parameters (Hammes and Verstraete 2002) such as pH, dissolved inorganic .

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Calcium Phosphate Precipitation in Wastewater Treatment

In systems containing carbonate and phosphate the effect of Mg on calcium phosphate and carbonate precipitation appears to be complex and pH dependent. Magnesium is reported to interfere with the precipitation of the calcium carbonate solids, calcite and aragonite, by .

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Calcium Carbonate (CaCO3) - Uses, Preparation, Properties ...

Precipitated Calcium Carbonate – Produced via chemical precipitation via a carbocation process or as a by-product of some bulk chemical processes. PCC crystal shape depends on the product and the product and the particles are more uniform and regular with a narrow size distribution.

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