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Phosphate rock acidulation

In making the so-called superphosphate, for example, the rock is acidulated with sulphuric acid and vthe following reaction takes place: The mixture of .CaSCM and Ca(H2PO4) z is called

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  • On the Modelling of Phosphate Rock Acidulation Process

    On the Modelling of Phosphate Rock Acidulation Process

    Jan 01, 1993 Acidulation of the phosphate rock can be simply designated by the following chemical reactions: 1) Reaction of fluoroapatite with sulfuric acid at the surface of the phosphate particles . (1) 6 CaF 2 3Ca 3 (PO 4) 2 + 60 H 2 SO 4 + 118 H 2 O + SiO 2 →

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  • US3205062A - Nitric acid acidulation of phosphate rock

    US3205062A - Nitric acid acidulation of phosphate rock

    EXAMPLE A Florida phosphate rock in the amount of 2205 parts was acidulated with 5962 parts .of 52% and 464 parts 66% (from the recovery cycle) nitric acid. The corn- The amount of nitric acid

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  • The effect of grinding on the acidulation of phosphate rock

    The effect of grinding on the acidulation of phosphate rock

    On a weight basis this amounts to an acidulation ratio of 1.8 pounds of acid per pound of PgO^ in the rock. Various investigators have studied the effect of acidulation ratio on the reaction (6, 9i 17 22, 26). They have r^orted that acidulation beyond a ratio of 1,8

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  • Di-calcium phosphate by direct acidulation of phosphate

    Di-calcium phosphate by direct acidulation of phosphate

    di-calcium phosphate by direct acidulation of phosphate rock. In general, when phosphate rock is treated with sulfuric acid, mono-calcium phosphate or phosphoric acid is formed. If less sulfuric acid is used, di-calcium phosphate should be formed theoretically, however only mono-calcium phosphate and undecomposed phos phate rock result in practice

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  • Partial Acidulation of Rock Phosphate for Increased

    Partial Acidulation of Rock Phosphate for Increased

    There is a need to investigate and identify locally available organic substrates with acidifying potential, which can be used as an additive in rock phosphate (RP)-organic material composting mixtures. This paper reviews attempts to increase P availability in the context of smallholder, low-input and organic farming, and presents a case study from Central India that used a participatory approach to address P

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  • (PDF) Partially acidulated phosphate rocks: Controlled

    (PDF) Partially acidulated phosphate rocks: Controlled

    [Show full abstract] acidulation with H2SO4 was effective in increasing the water-soluble P level of phosphate rock when the drying temperature of the product was not excessive. Crop response and

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  • Use of phosphate rocks for sustainable agriculture

    Use of phosphate rocks for sustainable agriculture

    Partial acidulation of phosphate rock. Partially acidulated phosphate rocks (PAPRs) are prepared by reacting PRs, usually with H 2 SO 4 or H 3 PO 4, in amounts less than that needed to make SSP or triple supersphosphate (TSP), respectively. The use of PAPRs has been widespread in Europe and South America since Nordengren (1957) first reported their use

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  • Phosphate Rock - an overview | ScienceDirect Topics

    Phosphate Rock - an overview | ScienceDirect Topics

    Typical Florida pebble phosphate rock contains about 3.6% fluoride expressed as elemental fluorine, and approximately 32% of this is released during the acidulation process (Pettit, 1951). Almost all of the fluoride vapors are evolved in the mixer and den although a slight evolution of vapor occurs during subsequent handling and storage operations

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  • Site-specific responses of lowland rice to acidulated and

    Site-specific responses of lowland rice to acidulated and

    Apr 19, 2021 This study evaluated the efficiency of low-grade Burkina Faso phosphate rock (BPR)-based P fertilizers, produced by acidulation and calcination-the major fertilizer processing methods, on lowland rice production and the soil factors influencing their effectiveness. The results showed that the acidulated P fertilizers were as effective as

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  • (PDF) In situ acidification of rock phosphate

    (PDF) In situ acidification of rock phosphate

    Sep 24, 2015 The influence of differing degrees of phosphoric acid acidulation of North Carolina phosphate rock on the total P uptake of ryegrass was examined. The

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  • Partially acidulated phosphate rocks: Controlled release

    Partially acidulated phosphate rocks: Controlled release

    Phosphate rocks partially acidulated either with H3PO4 or H2SO4 were compared against SSP or TSP as phosphate fertilizers for permanent pasture. Eleven field trials were conducted over periods of up to 6 yrs. Fertilizers were surface applied annually. Initial soil pHw values ranged from 5.5–6.3 and Soil P retention from 25% to 97%. The PRs used for partial acidulation were unground or ground

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  • Comparison between acidulation by sulfuric acid and by

    Comparison between acidulation by sulfuric acid and by

    A detailed investigation of two phosphate rock acidulation modes has been carried out in batch acidulators. The classical dihydrate process rate is affected by the coating of the rock particle by gypsum. The clean phosphoric acid process using phosphoric acid as an acidulation agent does not suffer from this inhibitory coating effect, however it is affected by the increasing viscosity of the

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  • Pure Phosphoric Acid from Hydrochloric or Sulfuric

    Pure Phosphoric Acid from Hydrochloric or Sulfuric

    Oct 27, 2019 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 HCl: 20 HCl + Ca10(PO4)6 F2 → 6H3PO4 + 10 CaCl2 + 2HF. 6 HF + SiO2 → H2SiF6 + 2H2O

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  • Phosphate Rock Treatment with Hydrochloric Acid for

    Phosphate Rock Treatment with Hydrochloric Acid for

    This acidulation step releases phosphoric acid from the calcium phosphate salts present and produces insoluble gypsum (calcium sulfate dihydrate) according to following reaction: Ca3(PO 4)2(s)+3 H2SO4(l) +6 H2O(l) → 2H3PO4(l) + 3 CaSO4 2H2O (s) The production units include large reaction vessels where finely ground phosphate rock is first

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  • Importance of phosphate pock application for sustaining

    Importance of phosphate pock application for sustaining

    Jan 24, 2019 The phosphate rock dissolution can be carried out through two main routes, namely partial acidulation and complete acidulation. Both routes could be performed by organic or mineral acids. The partial dissolution of phosphate rocks is based on the acidulation of one third of the phosphate material by acids to produce soluble monocalcium

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  • Broadfield Process Units - Bradley Pulverizer Company

    Broadfield Process Units - Bradley Pulverizer Company

    The Broadfield Process can produce SSP economically from all known phosphate rock sources. In reacting phosphate rock, limestone or other minerals with phosphoric or sulfuric acids, the Broadfield Process Unit can tolerate significant changes in feed and product specifications to produce fertilizers, enriched animal feeds and acid salts to meet your product specifications

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  • Feed the Future #CultivatingHope through Phosphate Rock

    Feed the Future #CultivatingHope through Phosphate Rock

    Sep 17, 2020 This research included partial acidulation of phosphate rock (reducing the amount of acid needed to produce water-soluble phosphorus (WSP) fertilizers). Though the research yielded good agronomic results, the acidulation process proved costly due to

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  • Solubility and Efficiency of Rock Phosphate Fertilizers

    Solubility and Efficiency of Rock Phosphate Fertilizers

    Soluble phosphates are the most common sources currently used in crop production in tropical soils; however, they present low efficiency and are more expensive than natural rock phosphates. The objective was to develop new phosphate fertilizers with slow solubility through the partial acidification of rock phosphates (RPs), incorporating materials with adsorption characteristics to favor slow

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  • Partially acidulated phosphate rock as fertiliser and

    Partially acidulated phosphate rock as fertiliser and

    acidulated phosphate rock. Phosphate sources Phosphate fertilisers used and their P analyses data are given in Table 1. The triple superphosphate (TSP) was a commercial sample and contained Fe 1.0%, Al 0.24%, and Ca 16.2%. The PAPRs were prepared from North Carolina PR ground to 75% passing a 75 p'm sieve and containing Ca 38.8070

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  • Comparing the phosphorus use efficiency of pre-treated

    Comparing the phosphorus use efficiency of pre-treated

    Jan 05, 2021 Rock phosphate and its acidulation. The ground RP was obtained from Hattar Industrial state, Haripur and was analyzed for total P content. This RP was utilized as such or in the acidulated form called acidulated rock phosphate (ARP) equivalent to SSP

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  • Preparation of monocalcium phosphate and/or phosphoric

    Preparation of monocalcium phosphate and/or phosphoric

    What is claimed is: 1. A process for the production of monocalcium phosphate and phosphoric acid, and calcium fluoride, which comprises: (a) acidulating phosphate rock with an excess of phosphoric acid in the presence of silicon dioxide to produce an acidulation reaction product mixture containing monocalcium phosphate, phosphoric acid, and insoluble solids;

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