The precipitation of anhydrous calcium hydrogen phosphate from homogeneous solution

Burrus, H. L.

doi:10.1002/jctb.5010111003

J. Appl. Chem.

1961

DOI: 10.1002/jctb.5010111003

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The precipitation of anhydrous calcium hydrogen phosphate from homogeneous solution

H. L. Burrus¹

Abstract: The production of a granular anhydrous calcium hydrogen phosphate for use in phosphors has been investigated by precipitation from homogeneous solution by means of urea hydrolysis. The course of the reaction has been investigated under a wide variety of conditions, and conditions for the precipitation of a suitable material have been established.

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1974

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Cited by 7 publications

References 7 publications

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The Precipitation of Sparingly‐Soluble Alkaline‐Earth Metal and Lead Salts with Slow Development of Supersaturation (Slow Anion and Hydroxyl Ion Addition): Kinetics of Nucleation and Induction Periods

Packter¹,

Sahay²

1974

Cryst Res and Technol

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Barium and lead sulphate and chromate precipitations were studied a t 20' t o 95 "C a t precipitation rates varying from ion 1-1 sec-l: the supersaturation was developed by slow direct addition of anion to metal nitrate solution and by neutralisation of equivalent metal salt in excess acid solution. Slow heterogeneous nucleation occurred onto particles dispersed within the aqueous solution. The nucleation rate a t any time waswhere k, is the rate constant for heterogeneous nucleation, N , is the maximum number of potential nuclei, N , is the number of nuclei after time t, I.P, is the ionic product (CMJ(CMt) and 2n is the number of metal salt ions in the critical nucleus, generally eight.Crystal growth started after induction periods 6) a t times just-after the times for maximum rate of formation of nuclei. The induction periods ( t ) for precipitations from solutions of initial cation concentration C M~ varied with precipitation rate (R)according to the relation t = , where y = n/(n + 1) a,nd k, (the unit recik, fMoRy procalinduction period) = 2! n+l .A. PACKTER, S. SAHAY Nucleation was somewhat slower for precipitations at higher temperatures. Probably, the nucleator particles were less readily 'wetted' and, overall, the function f (CTXS) decreased with rise in temperature ; nucleation rate constants then increased to some extent. Ref erenoesAIA, M. A.

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The Precipitation of Sparingly‐Soluble Alkaline‐Earth Metal and Lead Salts with Slow Development of Supersaturation (Slow Anion and Hydroxyl Ion Addition): Kinetics of Nucleation and Induction Periods

Packter¹,

Sahay²

1974

Cryst Res and Technol

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The precipitation of sparingly‐soluble acid, neutral and basic metal salts from aqueous solution: Ionic equilibria at different pHs, precipitate phases and precipitation mechanisms

Packter

1980

Cryst Res and Technol

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The precipitations of the sparingly-soluble acid, neutral and basic salts of the divalent cations beryllium, magnesium, calcium, strontium, barium, manganese (11), iron (11), cobalt (11), nickel (II), copper (11), zinc, cadmium, mercury (11), tin (11) and lead (11) with the inorganic anions sulphate, chromate, molybdate, monohydrogen phosphate, phosphate, and carbonate (from supersaturated aqueous solutions) are surveyed. The different types of ionic equilibria (cation hydrolysis, anion hydrolysis, ion-pair formation) that may influence these precipitations, at different pHs and ionic concentrations, are examined. The crystalline phases precipitated at different pHs are tabulated and the precipitation mechanisms (at different pHs) are analysed.Die Fiillungen der schwerloslichen sauren, neutralen und basischen Selze der zweiwertigen Kationen von Be, Mg, Ca, Sr, Ba, Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn, Cd, Hg(lI), Sn(I1) und Pb(I1) mit den anorganischen Sulfat-, Chromat-, Molybdate, Monohydrogenphosphat-, Phosphat-und Carbonatanionen werden in einer Ubersicht dargestellt. Die verschiedenen Typen der Ionengleichgewichte (Kationenhydrolyse, Anionenhydrolyse, Ionenpaarbildung), die diese Fiillungen bei verschiedenen pH-Werten und Ionenkonzentrationen beeinflussen konnten, werden betrachtet. -Die kristallinen Phasen, die bei verschiedenen pH-Werten ausfallen, werden tabellarisch wiedergegeben und die Fiillungsmechanismen (bei verschiedenen pH-Werten) analysiert.

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The Preparation of Sparingly‐soluble Alkaline‐earth Metal Salt Powders by Precipitation from Auqeous Solution: A Review of Small‐scale Laboratory and Large‐scale Industrial Studies

Packter

1982

Cryst. Res. Technol.

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The precipitation of anhydrous calcium hydrogen phosphate from homogeneous solution

Cited by 7 publications

References 7 publications

The Precipitation of Sparingly‐Soluble Alkaline‐Earth Metal and Lead Salts with Slow Development of Supersaturation (Slow Anion and Hydroxyl Ion Addition): Kinetics of Nucleation and Induction Periods

The Precipitation of Sparingly‐Soluble Alkaline‐Earth Metal and Lead Salts with Slow Development of Supersaturation (Slow Anion and Hydroxyl Ion Addition): Kinetics of Nucleation and Induction Periods

The precipitation of sparingly‐soluble acid, neutral and basic metal salts from aqueous solution: Ionic equilibria at different pHs, precipitate phases and precipitation mechanisms

The Preparation of Sparingly‐soluble Alkaline‐earth Metal Salt Powders by Precipitation from Auqeous Solution: A Review of Small‐scale Laboratory and Large‐scale Industrial Studies

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