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公开(公告)号：US12139775B2
公开(公告)日：2024-11-12
申请号：US17279932
申请日：2019-09-30
Applicant: OCP SA
Inventor： Hamid Mazouz , Rachid Boulif , Essaid Bilal
Abstract: The present invention relates to a process for purifying and concentrating rare earths contained in phosphogypsum, characterised in that it comprises the following steps of: from a phosphogypsum, a) Leaching the phosphogypsum with a solution of one or more strong acid(s) selected from among: sulphuric acid, nitric acid and hydrochloric acid, in order to obtain a leaching mixture comprising a liquid phase formed by a leaching solution containing rare earths from the phosphogypsum and the leaching acid, and a solid phase comprising the phosphogypsum, b) Adding, to the phosphogypsum, an oxidising agent to promote passage of the rare earths from the phosphogypsum into the leaching solution, and/or a reducing agent to reduce solubility of mineral impurities contained in the leaching solution in order to allow their passage from the leaching solution into the solid phase, c) Separating the liquid phase enriched in rare earths and depleted in mineral impurities, and the solid phase enriched in mineral impurities.
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公开(公告)号：US11702338B2
公开(公告)日：2023-07-18
申请号：US16762751
申请日：2018-11-09
Inventor： Driss Dhiba , Benoît Magny , Hamid Mazouz , Céline Methivier , Jacques Mongoin
IPC: C01B25/222 , C01B25/22 , C08F20/06 , C08K3/32
CPC classification number: C01B25/222 , C01B25/22 , C08F20/06 , C08K2003/329
Abstract: The invention relates to a method for the industrial preparation of phosphoric acid from an aqueous suspension comprising water and particles of at least one phosphate material dispersed in the presence of at least one additive of the anionic polymer type. Phosphoric acid is obtained by treating this suspension with at least one strong acid. The polymer is obtained by polymerization reaction of at least one acid selected from acrylic acid, methacrylic acid and salts thereof.
The invention relates to the use of this anionic polymer as well as the method for improving the rheology of the suspension and the hydrodynamics of the reaction medium in which the reactions for the manufacture of phosphoric acid take place.-
公开(公告)号：US20210388466A1
公开(公告)日：2021-12-16
申请号：US17279932
申请日：2019-09-30
Applicant: OCP SA
Inventor： Hamid Mazouz , Rachid Boulif , Essaid Bilal
Abstract: The present invention relates to a process for purifying and concentrating rare earths contained in phosphogypsum, characterised in that it comprises the following steps of: from a phosphogypsum, a) Leaching the phosphogypsum with a solution of one or more strong acid(s) selected from among: sulphuric acid, nitric acid and hydrochloric acid, in order to obtain a leaching mixture comprising a liquid phase formed by a leaching solution containing rare earths from the phosphogypsum and the leaching acid, and a solid phase comprising the phosphogypsum, b) Adding, to the phosphogypsum, an oxidising agent to promote passage of the rare earths from the phosphogypsum into the leaching solution, and/or a reducing agent to reduce solubility of mineral impurities contained in the leaching solution in order to allow their passage from the leaching solution into the solid phase, c) Separating the liquid phase enriched in rare earths and depleted in mineral impurities, and the solid phase enriched in mineral impurities.
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4.发明申请公开(公告)号：US20200094209A1
公开(公告)日：2020-03-26
申请号：US16467397
申请日：2017-12-07
Applicant: OCP SA
Inventor： Abdelaziz El Hachmi
Abstract: The present invention relates to a chemical phosphoric acid production unit, comprising: a reactor for the production of phosphoric acid, a receiving device (2) for receiving phosphogypsum obtained after filtration of phosphoric acid produced in the reactor, a discharge system (1) for discharging phosphogypsum from the receiving device (2). The chemical unit is mainly characterised in that the discharge system (1) comprises a chute (3) of which the inlet (4) is located inside the receiving device (2) and is arranged so as to communicate with said receiving device (2), and a flap (6) moveable around an axis of rotation (7), said flap (6) being able to open according to a predetermined angle (α) corresponding to a predetermined section (13) for the passage of a fraction of phosphogypsum through the inlet (4) of the chute (3), and to close in order to prevent the passage of phosphogypsum into the chute.
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公开(公告)号：US20190263668A1
公开(公告)日：2019-08-29
申请号：US16320285
申请日：2017-07-27
Applicant: OCP SA
Inventor： Khaoula KHALESS , Driss DHIBA
Abstract: The present invention relates to a process for producing sodium sulphate from phosphogypsum, comprising: a step (101) of lixiviation of phosphogypsum by means of a basic solution so as to obtain a sodium sulphate solution (S) containing metal impurities, said basic solution comprising a chelating agent suitable for forming complexes with at least one part of said metal impurities, at least one first step (103, 104) of filtration of the sodium sulphate solution by a nanofiltration membrane (NF1, NF2), so as to form a concentrate (C1, C2) containing said complexes and a permeate (P1, P2), a step (105) of evaporation of the permeate (P1, P2) so as to form anhydrous sodium sulphate.
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Patent Agency Ranking
公开(公告)号：US20180155207A1
公开(公告)日：2018-06-07
申请号：US15568089
申请日：2016-04-22
Applicant: OCP SA
Inventor： Kamal Samrane , Abdelaali Kossir
Abstract: The invention relates to a process for preparing synthetic calcium fluoride (CaF2) (min 90% CaF2 by weight) from fluosilicic acid, comprising the following steps: (a) reacting fluosilicic acid (H2SiF6) with ammonium hydroxide or ammonia in a first reactor so as to obtain a first slurry; filtering said first slurry so as to obtain a filtrate containing a solution of ammonium fluoride; (b) precipitating the solution of ammonium fluoride obtained as a filtrate in step (a) with calcium carbonate as a dry form or as a suspension at a concentration ranging from 10 to 80% by weight in a second reactor so as to produce a second slurry containing calcium fluoride and ammonium carbonate; filtering said second slurry so as to obtain a filter cake containing calcium fluoride and a filtrate containing a solution of ammonium carbonate; washing and drying said filter cake so as to obtain calcium fluoride and a filter cake washing containing a solution of ammonium carbonate; wherein a portion of the second slurry ranging from 10 to 70% is recycled to the second reactor (3) so as to enhance calcium fluoride crystallization; (c) evolving the major part of ammonia from the second reactor (3) in step (b) because of the partial decomposition of ammonium carbonate under reactor conditions and then scrubbing and returning said ammonia to the first reactor, and gathering and treating by distillation and condensation both ammonium carbonate solutions obtained as the filtrate and the filter cake washing in step (b) to recover liquid ammonia which is recycled to the first reactor (1).
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公开(公告)号：US20240327219A1
公开(公告)日：2024-10-03
申请号：US18037908
申请日：2021-11-19
Applicant: OCP SA , Universite Mohamed VI Polytechnique
Inventor： Khaoula Khaless , Rachid Boulif , Rachid Benhida
CPC classification number: C01B25/37 , B01J19/10 , B01J2219/089 , C01P2002/72 , C01P2002/77 , C01P2004/03 , C01P2006/80
Abstract: The present disclosure relates to a method for producing zinc phosphate with the application of ultrasound having a frequency greater than 100 KHZ.
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公开(公告)号：US20210261412A1
公开(公告)日：2021-08-26
申请号：US16766461
申请日：2018-11-22
Applicant: OCP SA
Inventor： Driss Dhiba , Lhoussaine Omari , Jamal Chaouki , Ahmad Mohaddespour
Abstract: The present invention relates to a process for decomposing calcium sulfide (CaS) into calcium oxide (CaO) and sulfur dioxide (SO2), comprising: —providing a reactor containing calcium sulfide and a source of carbon, —oxidizing the source of carbon so as to generate carbon dioxide (CO2), —reacting the calcium sulfide with said carbon dioxide so as to produce carbon oxide (CaO), sulfur dioxide (SO2) and carbon monoxide (CO) according to the following reaction: CaS+3CO2˜CaO+SO2+3CO wherein the oxygen and carbon contents in the oxidation step are chosen such that: (i) the mass ratio C/CaS is comprised between 0.15 and 0.35 and (ii) the mass ratio O2/C is comprised between 5 and 25.
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公开(公告)号：US20180222809A1
公开(公告)日：2018-08-09
申请号：US15750053
申请日：2016-08-03
Applicant: OCP SA
Inventor： Mehdi Khouloud , Abdelaali Kossir , Kamal Samrane
Abstract: The invention relates to a method for manufacturing an ammonium phosphate fertilizer from a phosphoric acid aqueous solution that has less than 50% P2O5 concentration and is obtained by wet phosphate ore treatment, said phosphoric acid containing traces of cadmium, comprising the following steps: (a) neutralizing said phosphoric acid solution (1) with ammonia (3) up to a molar ratio N/P of between 0.1 and 0.8, (b) reacting said partially neutralized solution (4) with a sulfide source (6) so as to form a cadmium sulfide precipitate (9), (c) separating said precipitate (9) so as to obtain a refined ammoniated phosphoric acid solution (10), (d) ammoniating and granulating said refined solution (10) so as to form said fertilizer (12).
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公开(公告)号：US20250084296A1
公开(公告)日：2025-03-13
申请号：US18955532
申请日：2024-11-21
Applicant: OCP SA , Prayon , Association Pour La Recherche Developpement Des Methodes Et Processus Industriels
Inventor： Rachid Boulif , Driss Dhiba , Nawal Semlal , Alain Germeau , Claudia Toussaint , Ange Nzihou , Doan Pham Minh , Abdoul Razac Sane
Abstract: A method for manufacturing a ceramic material for thermal energy storage, includes producing a mixture of at least particles of clay and particles of natural and/or synthetic phosphate, and water, the mixture comprising between 0.5% and 40% by weight of phosphate compared to the weight of the mixture with the exception of water, and shaping and firing of the mixture to obtain the ceramic material. A ceramic material for thermal energy storage includes: a matrix of clay and, if appropriate, sand, and particles of a natural and/or synthetic phosphate dispersed in the matrix, the ceramic material comprising between 0.5% and 40% by weight of phosphate compared to the weight of the ceramic material. A method for storing thermal energy in the ceramic material includes: placing a heat transfer fluid in contact with the ceramic material, to transfer heat from the heat transfer fluid to the ceramic material in a charge phase, and to transfer heat from the ceramic material to the heat transfer fluid in a discharge phase.
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