Production of dicalcium phosphate by treatment of phosphate rock concentrate with nitric acid

Liquid−liquid equilibrium (LLE) data of the system nitric acid + phosphoric acid + calcium nitrate + water + tri-n-octylamine (TOA) were measured at 298.15 K and atmospheric pressure. The distribution coefficients of nitric acid, phosphoric acid, calcium nitrate, and water and the separation factors of nitric acid against phosphoric acid, nitric acid against calcium nitrate, and nitric acid against the water were calculated. Based on these data, the capability and selectivity of TOA for extracting nitric acid in this system were evaluated. The experimental results were used to obtain binary interaction parameters and pair parameters as correlated by the electrolyte non-random two-liquid (eNRTL) model. The eNRTL model was shown to be suitable for predicting the LLE data of this system, with a rootmean-square deviation of just 1.17%.

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“…The chemical reaction of decomposing phosphate rock with nitric acid is given by eq 1: 5 + + + Ca F(PO ) 10HNO…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

Cao

Dong

et al. 2023

J. Chem. Eng. Data

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“…Using this material, the hard tissues can be reconstructed more efficiently than other calcium phosphates due to its high solubility in the body thus one can find practical applications of CaHPO 4 in dental cements and restorative materials [1 -3], and in the food additive calcium and phosphate supplements for humans and animals as well [4]. Also due to the high effective P 2 O 5 content, dicalcium phosphate is a slowly soluble form of fertilizer which is often used in agriculture for all types of soil and crops [5,6]. There are many studies of preparation of dicalcium phosphate (DCP) recently [1, 2, 7 -8].…”

Section: Introductionmentioning

confidence: 99%

A Study for Synthesis of Dicalcium Phosphate From Various Grades of Phosphatic Materials

Bui

2018

JST

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Anhydrous dicalcium phosphate with monetite structure plays a significant biological importance for the mineralization of bones and teeth. This compound can reconstruct the hard tissues due to its high solubility in the body than other calcium phosphate compounds. Di calcium phosphate is being used as a food -additive supplying calcium and phosphate for humans and animals. Due to the high effective P 2 O 5 content, this compound is also used efficiently as a slowly soluble fertilizer in agriculture for all soil and crop types. This paper presents results of synthesis of di calcium phosphate monetite from Ca(OH) 2 and phosphoric acid and di calcium phosphate brushite from the resulting solution after enriching of type IILao Cai apatite ore by phosphoric acid. The samples were examined by volumetric titration methods, XRD, SEM and EDS.

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Radiotracer investigation of phosphoric acid and phosphatic fertilizers production process

Abdelouahed

Reguigui

2011

J Radioanal Nucl Chem

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Production of dicalcium phosphate by treatment of phosphate rock concentrate with nitric acid

Cited by 5 publications

References 1 publication

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

A Study for Synthesis of Dicalcium Phosphate From Various Grades of Phosphatic Materials

Radiotracer investigation of phosphoric acid and phosphatic fertilizers production process

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