Acid Alcohol Leaching of Apatite

The apatite was ground in a rotary mill and wet screened at 150, 86, 75, 53, and 38 µm. The four narrow size fractions and the minus 38 µm apatite were used in this research. Each of the narrow size fractions of apatite were used to simulate the leaching of one uniform particle size. A chemical analysis of the apatite sample is shown in table 1.

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Effects of synthesis conditions on the morphology of …

HAP nanoparticles were synthesized by a wet chemical precipitation method, under atmospheric pressure, with calcium nitrate tetrahydrate (Ca(NO 3) 2 ·4H 2 O) as calcium source and diammonium phosphate ((NH 4) 2 HPO 4) as phosphorous source.Ca(NO 3) 2 ·4H 2 O and (NH 4) 2 HPO 4 were dissolved respectively in distilled …

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Exploration of disodium methylenebis naphthalene …

During this process, acid adjustors (H 3 PO 4 or/and H 2 SO 4) are utilized as depressants for apatite during the reverse flotation process ... -bearing minerals and silicate minerals still exist in phosphate concentrate which significant affect the efficiency of wet-process phosphoric acid [29], [30], [31]. Hence, the direct flotation method ...

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Inorganic process for wet silica-doping of calcium phosphate

The results of STEM-EDX mapping and 31 P solid-state NMR showed that silica was intercalated into the OCP hydrous layer, and then a layer-by-layer structure of apatite-silica was formed. In addition, similar to the conventional OCP, OCP-silica could be converted to apatite-containing silica through a simple solution-immersion process.

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Release and recovery of fluorine and iodine in the …

The recovery of fluorine and iodine in the production and concentration of wet-process phosphoric acid (WPA) can not only reduce environmental pollution, but also increase the added value of production. ... Wet-process phosphoric acid obtained from Kola apatite. Purification from sulphates, fluorine, and metals. Sep. Pur. Technol., 28 …

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Mechanochemical transformation of apatite to phosphoric …

Since the 1970s, wet process has been widely used to produce H 3 PO 4,which is based on the attack of large amounts of concentrated acid on apatite ores at a certain temperature. Sulfuric acid (H 2 SO 4) is the most common used acid in wet process, with subsequent filtration to separate the H 3 PO 4 phase.

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(PDF) Fundamentals of the Wet-Process Phosphoric Acid …

About a structure of sulfate coatings, being formed on the surface of apatite crystals during wet-process phosphoric acid production by the hemihydrate method. Russ. J. Appl. …

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Integrated Technology for Processing of Apatite Concentrate

The concentration of impurities is much lower than that in commercial wet-process phosphoric acid produced by the dihydrate process at Russian plants, the …

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(PDF) Fundamentals of the Wet-Process Phosphoric Acid …

About a structure of sulfate coatings, being formed on the surface of apatite crystals during wet-process phosphoric acid production by the hemihydrate method. Russ. J. Appl. Chem. 1987, 60 (No. 10), 2338-2339. Grinevich, A. V.; Kochetkova, V. V.; Katunina, A. B.; Voroshin, V. A. Formation of sulfate coatings and their structure on a surface of ...

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Designing an efficient fluorine recovery strategy for Wet-Process …

The production of phosphoric acid is directly related to world's consumption of phosphate, which dramatically exceeds 20 million tons in China. Currently, two major processes, furnace-process phosphoric acid (FPA) and wet-process phosphoric acid (WPA), each with its own advantages, are used to produce phosphoric acid [6], [7], [8].

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Wet-process phosphoric acid obtained from Kola apatite.

DOI: 10.1016/S1383-5866(02)00048-5 Corpus ID: 97839021; Wet-process phosphoric acid obtained from Kola apatite. Purification from sulphates, fluorine, and metals @article{Kijkowska2002WetprocessPA, title={Wet-process phosphoric acid …

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Effect of geological origin of apatite on reverse flotation separation

The purification of wet-process phosphoric acid has always posed a challenge for both academic and industrial researchers. In order to address this issue, a treatment unit was developed to mitigate magnesium and aluminum impurities from industrial semi-aqueous wet process phosphoric acid (SWPPA) (39.4 wt% P 2 O 5) …

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Phosphogypsum circular economy considerations: A critical …

The wet process, in which phosphate rock is usually treated with sulfuric acid, is the prevalent way of manufacturing phosphoric acid today ... 2-F system has shown an interdependence between PO 4 3− and F − because they are surely associated with the same phase, apatite (Ca 5 ...

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Wet-process phosphoric acid obtained from Kola apatite.

The purification of pre-concentrated up to 80 wt.% H 3 PO 4 phosphoric acid (PA) obtained from Kola apatite in one of the Polish plants by the wet processing route …

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Recovery of rare earth elements from phosphogypsum waste …

Direct REE leaching followed by ion exchange during apatite wet process is possible (Al-Thyabat and Zhang, 2015). Ion exchange can be utilized for REE recovery …

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(PDF) Synthesis and Characterization of Hydroxyapatite from …

Synthesis of hydroxyapatite(HAp), CA10(PO4)6(OH)2, using cockle shell (Anadara granosa) as a source of calcium has been carried out using a hydrothermal method through three routes, namely: direct synthesis of powdered shells; synthesis through the process of thermal decomposition powdered shells and synthesis through the formation of …

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zymywanie tripolifosforanu sodu (TPFS) ekstrakcyjnego …

m Kola-apatite wet-process phosphoric acid ~)rom an industrial solution otsodium phosphates Przedstawiono warunki tworzenia się wysoko-temperaturowej odmiany (Faza-1) tripolifosfo-

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(PDF) Fundamentals of the Wet-Process …

The phosphoric acid solution (PA) produced via the wet process, namely the treatment of apatite with sulfuric acid and …

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Effect of different synthesis conditions on physicochemical …

For synthesis, we used the standard wet method with different process conditions. ... In turn, dental enamel apatite crystals are much larger; their length reaches up to 200 nm, and the width and thickness, respectively 50–70 and 20–25 nm [14]. At the same time, the content of hydroxyl groups is about 74% relative to stoichiometric HAp.

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Recovery of rare earth elements from wet process

Wet-process phosphoric acid from the phosphorite treatment process differs from apatite one by impurity composition, i.e. the iron content is by 3.5 times, and calcium is by 5.0 times more. The complex composition of the wet-process phosphoric acid from the phosphorite treatment process requires additional researches to select optimal ion ...

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Wet Process Phosphoric Acid Purification Using …

The utilization of phosphoric acid in various sectors, e.g., food industry, is controlled by the authorized concentration limit of impurities. However, industrial phosphoric acid is contaminated with …

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Preparation of sodium tripolyphosphate from Kola-apatite …

The purification of pre-concentrated up to 80 wt.% H3PO4 phosphoric acid (PA) obtained from Kola apatite in one of the Polish plants by the wet processing route …

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Purification of wet process phosphoric acid by solvent …

The wet process phosphoric acid (WPA) is produced by a chemical reaction of the phosphate rock with a mineral acid [1], [2], [3]. This method is known to be the most economical way of getting phosphoric acid [1]. Three mineral acids can be used: nitric, hydrochloric and sulfuric acid. In Tunisia, sulfuric acid is used to transform the local ...

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Wet-process phosphoric acid obtained from Kola apatite.

The purification of pre-concentrated up to 80 wt.% H3PO4 phosphoric acid (PA) obtained from Kola apatite in one of the Polish plants by the wet processing route was carried out by sulphate ...

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GitHub

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Identification of impurities accumulated in the extractant in …

Impurities accumulated in the extractant in the course of operation of the plant for purification of wet-process phosphoric acid, obtained from apatite concentrate, by extraction with tri-n-butyl phosphate are identified by IR and mass spectra.

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Recovery of rare earth elements from the wet process …

The methods of producing non-radioactive rare earth concentrate from wet process phosphoric acid of dihydrate process of Khibiny apatite concentrate sulfuric acid treatment for fertilizer production have been proven. The features of their use in existing production were characterized.

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Recovery of rare earths from wet-process phosphoric acid

During the wet process of phosphoric acid, P 2 O 5 grade of phosphate ore should be greater than 29.0%, the content of MgO and sesquioxide (Fe 2 O 3 + Al 2 O 3 ) should not exceed 1.0% and 2.5% ...

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Utilization of Fenton oxidation approach in wet phosphoric acid process

A proper and effective flotation schemes plays an important role in providing the qualified products for further wet process. No matter for direct or reverse flotation process, sodium oleate (NaOL) is a generally employed collector which can be used to change the hydrophobicity of apatite and promote its attachment onto bubbles [1], [2]. In ...

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Efficient recovery of fluorine from wet-process phosphoric …

Phosphate rock is the main raw material for phosphoric acid production. According to data, more than 90 % of phosphate rock was currently used to produce wet-process phosphoric acid (WPA) in industry [8], [9]. During the production process of WPA, fluorine affected the quality of WPA and subsequent products.

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Separation of Rare Earth Elements from Phosphogypsum

Rare earth elements (REEs) have found many applications in various industries and technologies. Therefore, their separation from secondary resources, in addition to primary ones, has become significant. Apatite mineral is a necessary ingredient for the wet process, a chemical reaction between apatite and sulfuric acid that …

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Thermochemistry and Kinetics of the Reactions of …

consists in reducing apatite by carbon in presen ce of silica at a temperature up to 1500°C, to produce native phosphorus whic h is then oxidized into P 4O 10. The latter reacts with …

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Effect of different synthesis conditions on physicochemical …

For synthesis, we used the standard wet method with different process conditions. ... In turn, dental enamel apatite crystals are much larger; their length …

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