Precipitated Impurities of Fertilizers Prepared from Wet-Process Phosphoric Acid

Frazier, A. W.; Smith, James P.; Lehr, James R.

doi:10.1021/jf60147a026

Cited by 55 publications

(41 citation statements)

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“…Acidic metal diphosphates are also well known for their biological uses, notably their role in some enzymecatalyzed reaction processes [8]. They are also used as inhibitors in the formation and dissolution of apatite crystals in vitro [9] as well as additive in fertilizers [10,11], or even in medicine [12]. Generally, compounds with open-framework structures are of great interest in material science, owing to their industrial applications as catalysts, ion exchangers and in the area of gas separation [13].…”

Section: Introductionmentioning

confidence: 99%

Two new acidic diphosphates Rb2M(H2P2O7)2·2H2O (M = Zn and Mg): Crystal structures and vibrational study

Essehli¹,

Bali²,

Lachkar³

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Two new acidic diphosphates Rb2M(H2P2O7)2·2H2O (M = Zn and Mg): Crystal structures and vibrational study

Essehli¹,

Bali²,

Lachkar³

et al. 2010

Journal of Alloys and Compounds

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“…It was found, that the standard for 1−3 and 1−2 charge-types of electrolytes approach with three β (0) , β (1) , and C ϕ single electrolyte ion-interaction parameters for Na 3 PO 4 (aq) and Na 2 SO 4 (aq), respectively, give a good agreement with osmotic coefficients data. The parameters and the standard deviation of fit σ(ϕ) are given in Table 3.…”

Section: Evaluation Of the Binary Parameters And Activitymentioning

confidence: 62%

“…The solubility of the binary systems is determined and tabulated ( The solubility modeling approach based on ion interaction equations is also employed. The standard for (1−3 or 1−2) charge type respectively for Na 3 PO 4 (aq) or Na 2 SO 4 (aq) of electrolytes approach with three β (0) , β (1) , and C ϕ single electrolyte ion-interaction parameters gives a very good agreement with the osmotic coefficients data for unsaturated solutions, and with phosphate or sulfate salts equilibrium solubility data, used in parametrization. As a test of the solid−liquid equilibria, the model prediction is compared with the experimental solubility isotherms.…”

Section: Journal Of Chemical and Engineering Datamentioning

confidence: 74%

“…f γ is the long-range electrostatic term (1) , and C ϕ ) are adjusted to fit the obtained osmotic coefficients (Table 2). It was found, that the standard for 1−3 and 1−2 charge-types of electrolytes approach with three β (0) , β (1) , and C ϕ single electrolyte ion-interaction parameters for Na 3 PO 4 (aq) and Na 2 SO 4 (aq), respectively, give a good agreement with osmotic coefficients data.…”

Section: Evaluation Of the Binary Parameters And Activitymentioning

confidence: 99%

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Comparative Study of Sodium Phosphate and Sodium Sulfate in Aqueous Solutions at (298.15 to 353.15) K

Guendouzi

Aboufaris

2015

J. Chem. Eng. Data

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The binary and ternary aqueous solutions of sodium phosphate or/and sulfate were studied using the hygrometric method from dilution to saturation in the temperature range from (298.15 to 353.15) K. The hygrometric measurements of the binary systems were combined with reference pure water, Na 3 PO 4 (s), and Na 2 SO 4 (s) solubility data to construct a chemical model that calculates solute and solvent activities from dilute to saturated solution concentration (for (Na 3 PO 4 (s)) up to m max = 9.00 mol·kg −1 at 353.15 K; and up to m max (Na 2 SO 4 (s)) = 3.40 mol·kg −1 at 313.15 K). The constructed model was also used to calculate thermodynamic solubility product (K°s p ) of Na 3 PO 4 (s) and Na 2 SO 4 (s) in the temperature range (298.15 to 353.15) K. The excess Gibbs energies of Na 3 PO 4 (aq) and Na 2 SO 4 (aq) were evaluated at various temperatures. The results for these aqueous solutions were influenced by the effect of hydration shell, with ion association or formation ion pairing. The anion solute PO 4 or SO 4 influences the hydration in an aqueous solution; indeed the hydrogen bonding of water in the hydration shells of PO 4 3− anion is preeminent over that of SO 4 2− . The mixed electrolyte solutions {(yNa 3 PO 4 + (1 − y)Na 2 SO 4 }(aq) were also investigated in the temperature range from (298.15 to 353.15) K and at total molalities from dilution (0.10 mol·kg −1 ) to saturation for different ionic-strength fractions (y) of Na 3 PO 4 with y = 0.20, 0.50, and 0.80. The water activity of mixed salts solutions and related properties such as osmotic and activity coefficients were carried out at various temperatures. The osmotic coefficients data were used to evaluate the mixing parameters of the ion interaction model θ MN and ψ MNX in the ternary system Na 3 PO 4 + Na 2 SO 4 + H 2 O.

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“…Niahite is therefore the manganese analogue of the artificial compound NH4MgPO4.H20 described by Frazier et al (1966), and the name is proposed for material with Mn2+> (Mg+Ca). This compound was correlated with dittmarite by Mrose (1971), but an examination of analyses in Mclvor (1902) shows that this conclusion is doubtful.…”

mentioning

confidence: 99%

Niahite—A new mineral from Malaysia

Bridge

Robinson

1983

Mineral. mag.

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A NEW mineral niahite, NH4(Mn 2 +,Mg,Ca)PO4. H20, is found as fine radiating and sub-parallel clusters of crystals up to 0.5 mm in size in soft, fine-grained newberyite, MgHPO4" 3H20, in the Niah Great Cave, Sarawak, Malaysia. It is closely associated with what appears to be a 'gypsum variant', collophane, hannayite, struvite, variscite, and an unidentified zinc potassium phosphate, all derived from the breakdown of guano. Other associated minerals are gypsum, brushite?, vivianire, ardealite, and variants, strengite, monetite, whitlockite, leucophosphite, taranakite, opal, and quartz. A chemical analysis of niahite was obtained by means of a combination of electron probe microanalysis using analysed apatite (for Ca and P), MgO, and pure Mn as standards, and microchemical methods (for N, H, and P). The following figures were obtained: (NH4)20 12.9, MnO 27.21, MgO 4.19, CaO 1.99, P205 37.83, H20 11.88, total 96.00 %. This yields the empirical formula (NH,,)0.93 (Mn2 +0.72Mgo.2oCao.o6)~o.9sP1.0003.9s-1.23 H20 on the basis of P = 1. Single crystal X-ray studies could not be made due to the very soft and fragile nature of niahite, but the X-ray powder pattern is very close to that of NH4MgPO4'H20 in pattern 20-663 in the JCPDS Powder Diffraction File, and similar to NH4MnPO4"H20, JCPDS pattern 3-0027. The strongest lines in the X-ray powder pattern are given in Table I. The pattern can be indexed on an orthorhombic unit cell with a 5.68, b 8.78, c 4.88/k, and Z = 2. The (hkl) indices satisfy the extinction rule for space group Pmn21.

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Precipitated Impurities of Fertilizers Prepared from Wet-Process Phosphoric Acid

Cited by 55 publications

References 4 publications

Two new acidic diphosphates Rb2M(H2P2O7)2·2H2O (M = Zn and Mg): Crystal structures and vibrational study

Two new acidic diphosphates Rb2M(H2P2O7)2·2H2O (M = Zn and Mg): Crystal structures and vibrational study

Comparative Study of Sodium Phosphate and Sodium Sulfate in Aqueous Solutions at (298.15 to 353.15) K

Niahite—A new mineral from Malaysia

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