Physicochemical properties of new solid urea-nitric phosphate fertilizers. 2. Products from nitric acid, phosphate rock, urea, and supplemental wet-process phosphoric acid

1988 ◽  
Vol 27 (5) ◽  
pp. 857-865 ◽  
Author(s):  
Jack M. Sullivan ◽  
John H. Grinstead ◽  
Yong K. Kim ◽  
Kjell R. Waerstad
Keyword(s):  
Nitric Acid ◽  
Phosphoric Acid ◽  
Physicochemical Properties ◽  
Phosphate Rock ◽  
Phosphate Fertilizers ◽  
Acid Phosphate ◽  
Wet Process

scholarly journals Extraction of Nitric Acid from Wet-process Phosphoric Acid

2013 ◽  
Vol 20 (0) ◽  
pp. 183-195 ◽  
Author(s):  
Xuhong JIA ◽  
Jun LI ◽  
Yang JIN ◽  
Jianhong LUO ◽  
Baoming WANG ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Phosphoric Acid ◽  
Wet Process

Use of combined solvent extraction-electrodeposition techniques to uranium and thorium isotopes analysis in industrial phosphoric acid, phosphate and phosphogypsum by alpha-particle spectrometry

2003 ◽  
Vol 91 (1) ◽  
Author(s):  
R. Zarki ◽  
A. Elyahyaoui ◽  
A. Chiadli
Keyword(s):  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Isotopic Composition ◽  
Alpha Particle ◽  
Phosphate Rock ◽  
Liquid Extraction ◽  
Acid Phosphate ◽  
Liquid Liquid Extraction ◽  
Thorium Isotopes

SummaryA method combining liquid-liquid extraction and electrodeposition procedures is carried out to determine isotopic composition of uranium and thorium in technical wet phosphoric acid, phosphate rock and phosphogypsum leachates, by

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.

Estimation of Silicon in Presence of Fluorine Application to Phosphate Rock and Wet-Process Phosphoric Acid

1955 ◽  
Vol 27 (7) ◽  
pp. 1144-1147 ◽  
Author(s):  
S. Harel ◽  
E. R. Herman ◽  
A. Talmi
Keyword(s):  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Wet Process

scholarly journals Investigation of the Process of Purification of Wet-Process Phosphoric Acid and Production of Concentrated Phosphoric Fertilizers Based on it

2021 ◽  
pp. 1-10
Author(s):  
Gulnoza Kodirova ◽  
Israiljon Shamshidinov ◽  
Boxodir Sultonov ◽  
Rikxsitilla Najmiddinov ◽  
Bakhodir Mamurov
Keyword(s):  
Calcium Carbonate ◽  
Phosphoric Acid ◽  
Technological Parameters ◽  
Phosphate Fertilizers ◽  
High Quality ◽  
Wet Process ◽  
Phosphorus Containing ◽  
Calcium Magnesium ◽  
First Time

Fluoride compounds have the most harmful effects on the environment. The main source of fluoride in the soil is phosphorus-containing fertilizers. Purification of wet-process phosphoric acid (WPPA) from fluorine will significantly reduce its content in phosphorous-containing fertilizers and improve the quality of the resulting products. The aim of the study is to reduce the content of fluorine and sulfates in the wet-process phosphoric acid by introducing calcium carbonate, dolomite or phosphorite into the finished extraction pulp before filtration and obtaining high-quality calcium and magnesium-containing phosphate fertilizers based on it. Phosphates were determined by differential photometric, fluorine – ionometric, calcium, magnesium, aluminum, and iron-complexometric, and sulfates-by weight methods. For the first time, scientifically-based data were obtained on the simultaneous reduction of the content of fluorine and sulfates in WPPA from phosphorites of Central Kyzylkum and the production of calcium-magnesium phosphate fertilizers based on it. Optimal technological parameters of the process of simultaneous defluorination and desulfatation of  WPPA from Central Kyzylkum phosphorites with calcium carbonate, dolomite and washed burnt phosphoconcentrate (WСPC) were found by introducing them into the second section of the extractor, into the finished extraction pulp in the amount of 100% for sulfate binding and 100-150% for fluorine binding, as well as obtaining high-quality products based on purified WPPA. The degree of transition of fluorine to the gas phase and phosphogypsum at a rate of 100-150% of calcium oxide for fluorine binding is 86.2-89.4% and its content in the wet-process phosphoric acid decreases from 1.18% to 0.22-0.29%. At the same time, the SO3 content in the acid decreases from 1.21% to 0.24-0.26%. The filtration rate of the sulfate-phosphate pulp varies slightly and is 807.6-812.6 kg/m2·h by dry residue.

scholarly journals Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 416 ◽  
Author(s):  
Haijun Liang ◽  
Patrick Zhang ◽  
Zhen Jin ◽  
David DePaoli
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Shaking Table ◽  
Phosphorus Leaching ◽  
Flotation Tailings ◽  
Wet Process ◽  
Leaching Solution ◽  
Florida Phosphate

Phosphorite, or phosphate rock, is the raw material of phosphoric acid production. It has also been regarded as the most important secondary rare earth element (REE) resource due to low contents of rare earth elements contained in the ore. In Florida, there is about 19 Mt of phosphate rock mined annually. After beneficiation, the phosphate rock concentrate is utilized to produce phosphoric acid via a wet-process in which sulfuric acid is used to digest phosphate. During these processes, REEs and some phosphorus get lost in the byproducts including phosphatic clay, flotation tailings, phosphogypsum (PG), and phosphoric sludge. Recovering REEs and phosphorus from these wastes is beneficial to maximize the utilization of these valuable resources. This study focused on the effects of wet-process operating conditions on REE and phosphorus leaching from a kind of flotation tailing of Florida phosphate rock. The tailings were first beneficiated with a shaking table, and then a series of leaching tests were conducted on the shaking table concentrate. The results indicated that REEs had similar trends of leaching efficiency to those of phosphorus. Under the conditions of 16% phosphoric acid concentration in the initial pulp, a temperature of 75 °C, a stoichiometric ratio of sulfuric acid (H2SO4) to calcium oxide (CaO) of 1.1, and a weight ratio of liquid to solid of 3.5, REE and phosphorus leaching efficiencies reached relatively high values of approximately 61% and 91%, respectively. Analyses indicated that the phosphate ions (PO43−) in the leaching solution tended to combine with REE ions to form REE phosphates which precipitated into PG, but the other large amount of anions such as sulfate ions (SO42−) and fluoride ions (F−) took effect of steric hindrance to prevent PO43− from combining with REE cations. These two opposite effects determined the REE distribution between the leaching solution and PG.

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