phosphate rock acidulation - search results

USA Acidulation of phosphate rock Google Patents Acidulation of phosphate rock Download PDF Info Publication number USA USA USA USA USA US A US A US A US A U phosphate rock acidulation - search results

phosphate rock acidulation - search results

  • USA Acidulation of phosphate rock Google Patents

    Acidulation of phosphate rock Download PDF Info Publication number USA USA USA USA USA US A US A US A US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords calcium acid solution rock phosphate rock01/01/1993· 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 1Generally, more than 90% of the rock is decomposed in less than five minutesOn the Modelling of Phosphate Rock Acidulation Processcalcium phosphate by direct acidulation of phosphate rock is proposed and has been demonstrated on a pilot plant scale 4 REVIEW OF THE LITERATURE Phase Equilibria Ternary system CaOSO^HpO Hulett, Allen and Euler (31) determined the solubility of CaSC^ZHgG in water Ghasseveut (14) studied the solubility of un­ stable calcium sulfate hemihydrate in water Sfcraub, Partridge and White (31Dicalcium phosphate by direct acidulation of phosphate rock

  • Phosphate Rock an overview | ScienceDirect Topics

    Typical Florida pebble phosphate rock contains about 36% 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 The composition of mixer gases and total flue24/09/2015· The influence of differing degrees of phosphoric acid acidulation of North Carolina phosphate rock on the total P uptake of ryegrass was examined The(PDF) In situ acidification of rock phosphatecomplete acidulation (eg, for 20% acidulation, 344 g of 65% acid per kg of rock) The granule size of the product ranged from 04 to 4 mm Xray 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 Experimental design and field procedure A randomisedPartially acidulated phosphate rock as fertiliser and

  • Pure Phosphoric Acid from Hydrochloric or Sulfuric

    27/10/2019· 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 CaCO3 + 2HCl → CaCl2 + H2O + CO2 Fe2O3 + 6HCl → 2FeCl3 +50% acidulation of North Carolina phosphate rock with sulfuric acid, was compared over 4 growing seasons with triple superphosphate (TSP) and the highly reactive North Carolina phosphate rock at 22 permanent pasture sites in the National Reactive Phosphate Rock Project The performance of PAPR as a phosphorus (P) fertiliser for permanent pasture was determined by calculating the substitutionAgronomic effectiveness of a partially acidulated reactiveKeywords: Partially acidulated, phosphate rock, chemical solubility, sulfuric acid, particle size Abstract: The work presented in this paper deals with the determination of optimum parameters during the partial acidulation of the phosphate ore of Djebel Onk (Algeria) and the determination of P 2 O 5 watersoluble The first part is devoted to P 2 O 5 conversion rate during partial acidulationSTUDY OF SOME PARAMETERS TO OBTAIN THE P2O5 WATER

  • acidulation of phosphate rock djshunzcouk

    Thus, in those areas where no suciently economical energy source is available, acidulation of phosphate rock is the preferred procedure for the production of phosphoric acid, Essentially the acidulation of phosphate rock involves the dissolution of the rock phosphates in sulphuric acid and the formation of calcium sulphates The phosphate rock is initially converted to phosphoric acid (P 2 O 5In Situ Acidulation of Rock Phosphate January 2018 · Communications in Soil Science and Plant Analysis Watson Matamwa; Chris N Guppy; Graeme Blair; This study was undertaken to study the(PDF) In situ acidulation of rock phosphate24/09/2015· The influence of differing degrees of phosphoric acid acidulation of North Carolina phosphate rock on the total P uptake of ryegrass was examined The(PDF) In situ acidification of rock phosphate

  • Partial acidulation of phosphate rock for enhanced

    acidulation of the rock phosphate 20, 40, 50, 60 and 80 percent of H 2SO 4 solution was prepared with distilled water (v/v) Triplicate crucibles were added with 50 ml of each prepared acid solutions in 1:1 ratios (w/v) The rock phosphate after complete acidulation for 24 hrs was then placed in a muffle furnace for complete drying It was then ground and passed through a 02 mm sieve50% acidulation of North Carolina phosphate rock with sulfuric acid, was compared over 4 growing seasons with triple superphosphate (TSP) and the highly reactive North Carolina phosphate rock at 22 permanent pasture sites in the National Reactive Phosphate Rock Project The performance of PAPR as a phosphorus (P) fertiliser for permanent pasture was determined by calculating the substitutionAgronomic effectiveness of a partially acidulated reactiveLow cost improvement of the agronomic value of PR can be achieved by partial acidulation, so this modification of the phosphate rock show promise for utilization of PR reserves indigenous to developing countries Introduction included in research programs as a substitute for the expensive, soluble P fertilizers in acid soils and / or in The low P fertility of soils is a serious limitation to(PDF) Field evaluation of partially acidulated phosphate

  • 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 treated with weak phosphate acid and then reactedKeywords: Partially acidulated, phosphate rock, chemical solubility, sulfuric acid, particle size Abstract: The work presented in this paper deals with the determination of optimum parameters during the partial acidulation of the phosphate ore of Djebel Onk (Algeria) and the determination of P 2 O 5 watersoluble The first part is devoted to P 2 O 5 conversion rate during partial acidulationSTUDY OF SOME PARAMETERS TO OBTAIN THE P2O5 WATERIt has been found that the presence of fluorine in the nitric acidphosphate rock acidulation effluent in a F/H 3 PO 4 weight ratio of greater than about 00034 hindered the formation of water soluble phosphates via the reaction of the acidulation effluent with excess ammonium carbonate In order to carry out this invention is a practical manner, either 1 phosphate sources low in fluorineMETHOD FOR PRODUCING NITROPHOSPHATE FERTILIZER ESSO

  • LIFE CYCLE ASSESSMENT FOR INDUSTRIAL PROCESSESS ON THE

    They are formed as a byproduct of phosphate rock acidulation with sulfuric acid The last type of emissions are dusts generated by the crushing and transportation of a final product Materials and methods The investigated PAPRtype fertilizer preparations were obtained under laboratory scale, applying for calculations of the amount of sulfuric acid resulting from the stoichiometry of theThus, in those areas where no suciently economical energy source is available, acidulation of phosphate rock is the preferred procedure for the production of phosphoric acid, Essentially the acidulation of phosphate rock involves the dissolution of the rock phosphates in sulphuric acid and the formation of calcium sulphates The phosphate rock is initially converted to phosphoric acid (P 2 O 5acidulation of phosphate rock djshunzcoukcomplete acidulation (eg, for 20% acidulation, 344 g of 65% acid per kg of rock) The granule size of the product ranged from 04 to 4 mm Xray 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 Experimental design and field procedure A randomisedPartially acidulated phosphate rock as fertiliser and

  • Case Report Partial Acidulation of Rock Phosphate for

    Partial Acidulation of Rock Phosphate for Increased Productivity in Organic and Smallholder Farming Harun Cicek 1,*, Gurbir S Bhullar 1,*, Lokendra S Mandloi 2, Christian Andres 1,3 and Amritbir S Riar 1 1 Research Institute of Organic Agriculture (FiBL), Ackerstrasse 113, Postfach 219, CH5070 Frick, Switzerland; [email protected]fibl 2 bioRe Association India, 5th km mile stoneThe present study investigated the effect of different levels of acidulated rock phosphate (RP), liquid or solid and application methods on phosphorus use efficiency and wheat yield under calcareous soils of Peshawar during 201516 Treatments included acidulation of 100Effect of acidulated levels and application techniques of50% acidulation of North Carolina phosphate rock with sulfuric acid, was compared over 4 growing seasons with triple superphosphate (TSP) and the highly reactive North Carolina phosphate rock at 22 permanent pasture sites in the National Reactive Phosphate Rock Project The performance of PAPR as a phosphorus (P) fertiliser for permanent pasture was determined by calculating the substitutionAgronomic effectiveness of a partially acidulated reactive

  • (PDF) Field evaluation of partially acidulated phosphate

    Low cost improvement of the agronomic value of PR can be achieved by partial acidulation, so this modification of the phosphate rock show promise for utilization of PR reserves indigenous to developing countries Introduction included in research programs as a substitute for the expensive, soluble P fertilizers in acid soils and / or in The low P fertility of soils is a serious limitation toIt has been found that the presence of fluorine in the nitric acidphosphate rock acidulation effluent in a F/H 3 PO 4 weight ratio of greater than about 00034 hindered the formation of water soluble phosphates via the reaction of the acidulation effluent with excess ammonium carbonate In order to carry out this invention is a practical manner, either 1 phosphate sources low in fluorineMETHOD FOR PRODUCING NITROPHOSPHATE FERTILIZER ESSODifferences with phosphate rock and acidulation process: P from ashes is in complexes with Fe, Al or Ca, not always similar to phosphate rock Heavy metals and contaminants can react with acid regular acidulation doesn’t yield the physical and chemical results required Fine powder no grinding needed, but impact on storage and handling 1 Monoincineration ashes a) Meat and bone meal ashesPowerPoint Presentation

  • EMISSION OF VOLATILE FLUORINE COMPOUNDS FROM

    from the products of Morocco II phosphate rock acidulation by PAPR technique using H 2SO 4 Parameter Unit Results for given type of fertilizer product depending on PAPR value 01 03 05 07 10 Fertilizer output Mg 8000 Phosphate rock (Morocco II) consumption Mg/day 7720 6996 6268 5719 5090 F– content in phosphate rock Mg/day 266 241 216 197 175 F– content in product Mg/dayThey are formed as a byproduct of phosphate rock acidulation with sulfuric acid The last type of emissions are dusts generated by the crushing and transportation of a final product Materials and methods The investigated PAPRtype fertilizer preparations were obtained under laboratory scale, applying for calculations of the amount of sulfuric acid resulting from the stoichiometry of theLIFE CYCLE ASSESSMENT FOR INDUSTRIAL PROCESSESS ON THE