Ratio of Fluorine to Phosphoric Acid in Phosphate Rock

Reynolds, David S.; Jacob, K. D.; Hill, W. L.

doi:10.1021/ie50240a029

Cited by 15 publications

(16 citation statements)

References 3 publications

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“…The percentages of fluorine were nearly constant in the mechanical fractions from a particular sample, rn tile case Of the pebble phosphated the fluorine content of the original 8 samples was approximately constant and did not vary with the phospllorus pentoxide content, which is in agreement with results previously obtained on this type of phosphate( 7 ) . 'In all the samples analyzed during this investigation, the The loss was particularly great in the rock phosphates, the silica concentrated to a marked extent Inzoluble in 1 decrease in the percentages of silica as the particle , Sb: 0, ; Fl,,or?ne-P O, ratio a After drying at 105' C.…”

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confidence: 89%

Composition of Mechanical Separates from Ground Phosphate Rock

Hill¹,

Marshall²,

Jacob³

1931

Ind. Eng. Chem.

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pentoxide 38.0, for acetone 41.4, and for diethyl ether 32.9, all being of approximately the same order. From a composite curve of the present authors' data on n-amyl mercaptan, taking values for K of from 30-150 seconds, a coefficient of 5.08 is obtained for the range 425-475" C., which gives 1.384 for 10" C. intervals, a heat of activation of 33,800 calories, and E/RT at 24.6.Should it be necessary to invoke chain reactions to explain the speed of such unimolecular reactions, the thermal decomposition of mercaptans may be formulated as follows:The assumption is made of scission into free radicals.The recombination of these free radicals then becomes statistically very improbable. Equation ll however, is only a trigger reaction, and Equations 2 and 3 constitute a plausible chain thereafter. The following may also be written: Equation 4 is a companion reaction to Equation 1 and would be evinced by a small yield of saturated hydrocarbon. Otherwise the chain goes on as before, AcknowledgmentThe authors wish to acknowledge the cooperation of C. E.Anding, Jr., in the development of the refinements of the analytical determinations of mercaptans and the helpful criticism of J. B. Hill and L. M. Henderson. Literature Cited(1)

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confidence: 89%

Composition of Mechanical Separates from Ground Phosphate Rock

Hill¹,

Marshall²,

Jacob³

1931

Ind. Eng. Chem.

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“…56, Tennessee brown-rock phosphate, was used in the majority of the experiments with different fusion mixtures. Previous analyses (11) of this material by the volatilization method, together with analyses during the present investigation, indicate that it contains between 3.45 and 3.55 per cent fluorine. For the purpose of the present paper a fluorine value of 3.45 per cent is used.…”

Section: Methodssupporting

confidence: 71%

Method for determination of fluorine in phosphate rock and phosphatic slags

Reynolds¹,

Jacob²

1931

Ind. Eng. Chem. Anal. Ed.

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“…The fluorine content is variable within a considerable range but is always much less than the theoretical for fluoro-apatite (22,63,97,98,105,106,110,113,114,117,199,216). The minerals in fossil bone usually contain increased amounts of fluorine (42,165,175,176,177), which appear to enter the lattice by isomorphous replacement of COs and H2O (74) or OH (114).…”

Section: B Minor Constituentsmentioning

confidence: 99%