Fundamentals of the Wet-Process Phosphoric Acid Production. 2. Kinetics and Mechanism of CaSO4·0.5H2O Surface Crystallization and Coating Formation

1997 ◽  
Vol 36 (2) ◽  
pp. 467-473 ◽  
Author(s):  
Sergey V. Dorozhkin
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Kinetics And Mechanism ◽  
Surface Crystallization ◽  
Wet Process ◽  
Coating Formation

Water–Phosphorus Nexus for Wet-Process Phosphoric Acid Production

2018 ◽  
Vol 57 (20) ◽  
pp. 6968-6979
Author(s):  
Hang Ma ◽  
Xiao Feng ◽  
Chun Deng
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Wet Process

Effect of Surfactants on Phosphogypsum Crystallization and Filtration during Wet-Process Phosphoric Acid Production

2000 ◽  
Vol 35 (3) ◽  
pp. 395-410 ◽  
Author(s):  
H. EL-SHALL ◽  
E. A. ABDEL-AAL ◽  
B. M. MOUDGIL
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Wet Process

Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
H.T. Fukuma ◽  
E.A.N. Fernandes ◽  
A.L. Quinelato
Keyword(s):  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Half Life ◽  
Pilot Plant ◽  
Acid Production ◽  
Phosphate Rock ◽  
Natural Radionuclides ◽  
Wet Process ◽  
Uranium Concentrate ◽  
Uranium Phosphate

A high-uranium phosphate rock from the Itataia deposit, located in the state of Ceará, Brazil, was milled in a pilot plant for wet-process phosphoric acid production. Further processing with solvent extraction (DEHPA/TOPO) was used aiming to recover uranium from the phosphoric acid. The distribution of natural radionuclides with long physical half-life of the

scholarly journals Studies on the transformation of calcium sulphate dihydrate to hemihydrate in the wet process phosphoric acid production

2012 ◽  
Vol 14 (2) ◽  
pp. 80-87 ◽  
Author(s):  
Barbara Grzmil ◽  
Bogumił Kic ◽  
Olga Żurek ◽  
Konrad Kubiak
Keyword(s):  
Phase Composition ◽  
Phosphoric Acid ◽  
Diffraction Analysis ◽  
Acid Production ◽  
Phosphate Rock ◽  
Calcium Sulphate ◽  
Industrial Plant ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wet Process

Studies on the transformation of calcium sulphate dihydrate to hemihydrate in the wet process phosphoric acid production The influence of the process temperature from 85°C to 95°C, the content of phosphates and sulphates in the wet process phosphoric acid (about 22-36 wt% P2O5 and about 2-9 wt% SO42-) and the addition of αCaSO4·0.5H2O crystallization nuclei (from 10% to 50% in relation to CaSO4·2H2O) on the transformation of calcium sulphate dihydrate to hemihydrate has been determined. The wet process phosphoric acid and phosphogypsum from the industrial plant was utilized. They were produced by reacting sulphuric acid with phosphate rock (Tunisia) in the DH-process. The X-ray diffraction analysis was used to determine the phase composition and fractions of various forms of calcium sulphates in the samples and the degree of conversion of CaSO4·2H2O to αCaSO4·0.5H2O and CaSO4. It was found that the transformation of CaSO4·2H2O to αCaSO4·0.5H2O should be carried out in the presence of αCaSO4·0.5H2O crystallization nuclei as an additive (in the amount of 20% in relation to CaSO4·2H2O), at temperatures 90±2°C, in the wet process phosphoric acid containing the sulphates and phosphates in the range of 4±1 wt% and 27±1 wt%, respectively.

scholarly journals Evaluation of Saudi Phosphate Rocks for Wet Process Phosphoric Acid Production

1992 ◽  
Vol 4 (1) ◽  
pp. 33-44 ◽  
Author(s):  
T.F. Al-Fariss ◽  
H.O. Ozbelge ◽  
F.A. Abdel Aleem ◽  
S.M. Abdulrazik
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Phosphate Rocks ◽  
Wet Process

Control foaming performance of phosphate rocks used for wet-process of phosphoric acid production by phosphoric acid

2020 ◽  
Vol 195 ◽  
pp. 105364 ◽  
Author(s):  
Hongqiang Li ◽  
Wu Ge ◽  
Jun Zhang ◽  
Richard M. Kasomo ◽  
Jiahao Leng ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Acid Production ◽  
Phosphate Rocks ◽  
Wet Process
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