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

1993 ◽  
Vol 34 (3) ◽  
pp. 203-207 ◽  
Author(s):  
R Marcato ◽  
M. Giulietti
Keyword(s):  
Nitric Acid ◽  
Phosphate Rock ◽  
Dicalcium Phosphate

scholarly journals (106)Studies on Fertilizers of Phosphate Rock-Urea-Nitric Acid System

1951 ◽  
Vol 54 (3) ◽  
pp. 210-213
Author(s):  
Shoichiro Nagai ◽  
Takafumi Kanazawa ◽  
Koji Saito
Keyword(s):  
Nitric Acid ◽  
Phosphate Rock ◽  
Acid System

scholarly journals Study of The Physicochemical and Commercial Properties of NPK Fertilizers

2021 ◽  
Vol 13 ◽  
Author(s):  
Tursunov Shahboz ◽  
Panjiev Olimjon
Keyword(s):  
Nitric Acid ◽  
Moisture Content ◽  
Acid Content ◽  
Phosphate Rock ◽  
Initial Moisture Content ◽  
Npk Fertilizers ◽  
Nitric Acid Content

Kyzylkum phosphate rock was studied with a nitric acid content of 50 and 75 and 100%, as well as in fertilizers obtained from the ratio of R2O5: K2O = 1:1. The gyroscopic points of the fertilizer size of 2-3 mm were determined at 250 ° C by the desiccator method of N.Ye. Pestov. The points of hygroscopicity of fertilizer samples with an initial moisture content of 1.0% were No. 1 - 46.5%, No. 2 - 38.0% and No. 3 - 32.4%.

An Improved Alkaline Citrate Method for Evaluation of Phosphorus in Fertilizers

1964 ◽  
Vol 47 (6) ◽  
pp. 1048-1054
Author(s):  
J A Brabson ◽  
W G Burch
Keyword(s):  
The Netherlands ◽  
Extraction Method ◽  
Phosphate Rock ◽  
Field Tests ◽  
Dicalcium Phosphate ◽  
Ammonium Citrate ◽  
Citrate Solution ◽  
Citrate Method ◽  
Insoluble Portion

Abstract The Netherlands alkaline ammonium citrate extraction method for the determination of available P2O5 was modified for routine use. The water-insoluble portion of the sample is extracted with the alkaline citrate solution for 2 hours in a shaking apparatus at 65°C. Dicalcium phosphate dissolves, but apatite, whether formed in processing (as in the ammoniation of superphosphate) or present as unreacted phosphate rock, does not dissolve. The results of the extraction method correlate well with those of field tests of the fertilizers.

TRUE ABSORPTION OF PHOSPHORUS IN SHEEP FED CORN SILAGE AND CORN SILAGE SUPPLEMENTED WITH DICALCIUM OR ROCK PHOSPHATE

1989 ◽  
Vol 69 (1) ◽  
pp. 181-186 ◽  
Author(s):  
M. de S. DAYRELL ◽  
M. IVAN
Keyword(s):  
Key Words ◽  
Isotope Dilution ◽  
Phosphate Rock ◽  
Rock Phosphate ◽  
Corn Silage ◽  
Dicalcium Phosphate ◽  
Isotope Dilution Method ◽  
Dilution Method ◽  
Northern Ontario ◽  
True Absorption

Eighteen male crossbred sheep were assigned to three groups and fed corn silage (CS), corn silage and dicalcium phosphate (CS-DP) or corn silage and rock phosphate (CS-RP). The rock phosphate originated from an igneous deposit located in Cargill Township in Northern Ontario. The endogenous fecal loss of phosphorus (P) was estimated by the isotope dilution method using 32P as a tracer. The total fecal P and total fecal endogenous P increased with increasing P intake. However, the percentage of endogenous fecal P was in the order: CS > CS-DP > CS-RP. The true absorption of P was 75.1, 67.3 and 48.1% for CS, CS-DP and CS-RP, respectively. The availability of P from rock phosphate supplement is much lower than that from dicalcium phosphate supplement. Key words: Sheep, phosphorus, true absorption, corn silage, dicalcium phosphate, rock phosphate

Nitric Phosphates from Phosphate Rock, Nitric Acid, Ammonia, and Carbon Dioxide

1953 ◽  
Vol 1 (17) ◽  
pp. 1050-1054 ◽  
Author(s):  
F. T. Nielsson ◽  
L. D. Yates ◽  
L. F. Roy ◽  
F. G. Heil
Keyword(s):  
Carbon Dioxide ◽  
Nitric Acid ◽  
Phosphate Rock

scholarly journals (306-307)Synthetic Fertilizers of Phosphate Rock-Urea-Nitric Acid System.III-IV

1951 ◽  
Vol 54 (10) ◽  
pp. 611-615
Author(s):  
Shoichiro Nagai ◽  
Takafumi Kanazawa ◽  
Kazuo Sakurada
Keyword(s):  
Nitric Acid ◽  
Phosphate Rock ◽  
Synthetic Fertilizers
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