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fluosilicic acid acidulation of phosphate rock

22Feb 1569

Phosphate Rock Acidulation, Factors Affecting Fluorine ...

2019-5-25 · Phosphate Rock Acidulation, Factors Affecting Fluorine Volatilization during Acidulation of Phosphate Rock with Sulfuric and Phosphoric Acids

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2Feb 973

The effect of grinding on the acidulation of phosphate rock

2020-10-13 · acidulation ratio and acid concentration. The Process Reactions It has been r^orted (27, 28) that the main constituent of phosphate rock is fluorapatite. The principle products of the action of sulfuric acid on fluoirapatite are monocalcium phosphate and calcium sulfate. The over-all reaction assumed to occur is frequently written

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25Feb 1956

NIOSHTIC-2 Publications Search

The Bureau of Mines conducted pioneering batch and laboratory cyclic tests that simulated plant operation in developing a procedure for acidulating phosphate rock with fluosilicic acid. Both high-grade deslimed phosphate rock and low-grade phosphate rock samples were treated. The most promising results were obtained by acidulating deslimed high-grade material.

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16Feb 1793

(PDF) Fluosilicic Acid: Recovery System and Aluminum ...

Fluosilisic acid (HrSiFu) is mainly produced as a by-product from the wet process of Phosphoric Acid production from fluorapatite. Phosphate rock always contains fluorine. For F/P2O5 ratios, the ...

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5Feb 898

Download [PDF] Utilization Of Waste Fluosilicic Acid Free ...

Fluosilicic Acid Acidulation of Phosphate Rock Author: Lloyd Harold Banning Publish On: 1975 Defluorination of phosphate rock ( 3 ) and the utilization of waste fluosilicic acid for producing valuable fluorine products ( 1 ) have been investigated ...

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1Feb 956

Recover Hydrofluoric Acid from Fluosilicic Acid Waste

2021-2-8 · The H2SiF6 used in this investigation was an unrefined product from the scrubbers of a phosphate fertilizer company. Several batches were used. Except where noted, the acid contained 274 g/l fluorine and 80 g/l silicon. Although this product is referred to as fluosilicic acid and assigned a formula, in practice it did not show an exact composition.

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8Feb 1538

(PDF) Manufacture of Aluminium Fluoride of High Density ...

- Reaction of phosphate rock with hydrochloric acid, main raw materials, from which a monocalcium phosphate liquor is obtained. • Purification of the rem aining …

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24Feb 1231

Reacting An Acid And Phosphate Rock Patents and Patent ...

2008-10-16 · Abstract: Phosphoric acid, essentially free from impurities, is prepared by reacting aqueous hydrofluoric acid with phosphate in particles of calcium bearing phosphate rock to form a calcium fluoride pseudomorph solid from which filter-grade phosphoric acid is separated. By reacting the pseudomorph solid with sulfuric acid and thermally treating the reaction product, …

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30Feb 1764

US3205062A

nitric acid acidulation acid rock reaction Prior art date 1962-03-12 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US178960A Inventor David C Gattiker Gerhard J ...

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16Feb 1632

Enhancement of phosphate rock solubility through ...

1994-1-1 · Biological acidulation of a reactive phosphate rock (PR), Sechura, was investigated by exposing ground PR to various combinations of elemental sulphur, soil suspension enriched with Thiobacilli, nutrient solution and lactic casein whey. The incubation was carried out at 30°C for 4 weeks. Weekly measurements were made of the pH of the mixture ...

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28Feb 1718

(PDF) Fluosilicic Acid: Recovery System and Aluminum ...

Fluosilisic acid (HrSiFu) is mainly produced as a by-product from the wet process of Phosphoric Acid production from fluorapatite. Phosphate rock always contains …

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14Feb 1924

Partial acidulation of phosphate rock for enhanced ...

2018-6-14 · lated rock phosphate in alluvial soil collected from agricultural farm located at Bihar Agricultural Univer-sity, Sabour. The solubility characteristics of the Phos-phatic fertilizers were analysed in the laboratory (Fig. 1). At zero degree acidulation of phosphate rock, both WSP and acid soluble P was initially absent, thus un-

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29Feb 789

On the Modelling of Phosphate Rock Acidulation Process ...

1993-1-1 · Phosphate rock particle size is an important factor in the acidulation process. The rock has to be fine enough to allow total dissolution of P 2 O 5 values. The dissolution kinetics are slow enough to be measured as shown in Fig. 1.Generally, more than 90% of the rock is decomposed in less than five minutes.

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10Feb 1123

Effect of acidulation of high cadmium containing …

Little information is available in literature on Cd uptake by crops from either phosphate rock (PR) or partially acidulated PR (PAPR). The purpose of this greenhouse experiment was to study the effect of acidulation of two PRs having high Cd content (highly reactive North Carolina PR and low-reactive Togo PR) on Cd uptake by upland rice. The degrees of acidulation with H2SO4 …

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18Feb 620

PHOSPHATE ROCK PROCESSING AND FERTILIZERS …

The concentrated phosphoric acid is produced by the acidulation of beneficiated fine grind phosphate rock with sulfuric acid, using "Prayon" ... Fluosilicic acid (H 2 SiF 6

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10Feb 1995

By-Products from Phosphoric Acid: Fluosilicic Acid ...

Phosphoric acid is rich in materials that are potentially attractive for their by-product value. The most common by-product that is being recovered from phosphoric acid is fluosilicic acid. Most phosphate rock contains roughly 4% fluoride, and most of this evolves phosphoric acid …

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23Feb 600

Partially acidulated phosphate rock as fertiliser and ...

2018-6-12 · complete acidulation (e.g., for 20% acidulation, 344 g of 65% acid per kg of rock). The granule size of the product ranged from 0.4 to 4 mm. X-ray diffraction studies indicated that the P APRs contained approximately 6% of the total P as dicalcium phosphate. The rest of the P was present as monocalcium phosphate and unacidulated apatite.

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6Feb 555

Di-calcium phosphate by direct acidulation of phosphate …

2020-10-13 · "When phosphate rock is treated with sufficient acid, mono-calcium phosphate or phosphoric acid can be formed. If less sulfuric acid is used di-calcium phosphate should be formed theoretically, however only mono-calcium phosphate and undecomposed phosphate rock result in practice. Acidulation to di-calcium phosphate is of considerable interest ...

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30Feb 870

Phosphoric Acid Manufacturing Through Hydrochloric …

2020-10-5 · Acidulation of Rock Phosphate by Hydrochloric Acid Rock phosphate, when treated with hydrochloric acid, is decomposed to give mainly phosphoric acid and chlorides of calcium, iron, magnesium, aluminum as impurities. The acidulation reaction was carried out at 52 ± 1 °C, using commercial hydrochloric acid (31%). After analysis

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4Feb 1070

Phosphoric Acid Manufacturing Through Hydrochloric …

2016-7-31 · rock phosphate (phosphorite) by acidulation with different mineral acids such as sulfuric, hydrochloric or nitric acid, etc., or by burning of phosphorus produced through electro-thermal process [3]. Acidulation of rock phosphate with sulfuric acid is mostly preferred for the production of fertilizer grade phosphoric acid, and may be classified ...

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6Feb 821

(PDF) PHOSPHATE ROCK PROCESSING AND FERTILIZERS …

acidulation of beneficiated fine grind phosphate rock with sulfuric acid, using "Prayon" dehydrate wet process. Low concentration phosphoric acid, 28% P 2 O 2, produced from filters,

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26Feb 1054

(PDF) Manufacture of Aluminium Fluoride of High Density ...

- Reaction of phosphate rock with hydrochloric acid, main raw materials, from which a monocalcium phosphate liquor is obtained. • Purification of the rem aining solution by me ans of the removal ...

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27Feb 593

Phosphate Rock

Phosphate rock used for fertilizer is a major NORM due to both uranium and thorium. Phosphate is a common chemical constituent of fertilizer. It is principally mined from apatite and phosphate rocks (phosphorite) in which the concentration of phosphate has been enhanced by sedimentary, igneous, weathering, and biological processes.

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19Feb 1775

Pure Phosphoric Acid from Hydrochloric or Sulfuric ...

2019-10-27 · Unground phosphate rock is fed into the first of a series of three dissolvers along with recycle HCl, a portion of the HCl feed, and CCD wash water. The following are the major reactions in the acidulation of phosphate rock with …

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30Feb 1077

US5427757A

(PDF) Fluosilicic Acid: Recovery System and Aluminum ...

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3Feb 745

FSA Neutralization with Calcium Compounds

2014-1-1 · This paper discusses Fluosilicic Acid neutralization with several calcium compounds such as phosphate rock, lime and limestone. © 2014 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the Scientific Committee of SYMPHOS 2013. Keywords: Fluoride, Fluosilicic acid, neutralization, phosphate rock, lime, limestone. 1.

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1Feb 913

Agronomic effectiveness of a partially acidulated reactive ...

2015-4-27 · Reactive Phosphate Rock Project provided such an opportunity. This paper reports on the effectiveness of a sulfuric PAPR applied in core experiment 2 at field sites in the National Reactive Phosphate Rock Project. The fertiliser was produced by the 50% acidulation of North Carolina phosphate rock (NCPR) with sulfuric acid. Materials and methods

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16Feb 732

US2636806A

acid solution rock phosphate rock Prior art date 1950-05-19 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US163106A Inventor Ernest A Winter

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27Feb 993

Unacidulated and Partially acidulated phosphate rock ...

The agronomic effectiveness of unground North Carolina phosphate rock (PR) and partially acidulated phosphate rocks (PAPR) prepared by acidulation of the PR with 30%, 40% and 50% of the phosphoric acid needed for complete acidulation, was determined in a 4 year field experiment on permanent pastures. The soil developed from volcanic ash, and was highly P retentive. The …

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19Feb 752

INVESTIGATION ON THE PHOSPHATE ROCK …

2012-11-13 · mixtures, which differs in production process. PAPR are made by treating phosphate rock with less than the stoichiometric amount of acid needed for complete acidulation of apatite structure in the raw material [3]. Manufacture process of superphosphate – phosphate rock mixtures is based on mechanical blending of superphosphate and phosphate rock.

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