Ocp Sa

Coatex

K-technologies, Inc.

Other

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Driss Dhiba

William Wes Berry

Thomas E Baroody

Hamid Mazouz

Mounir El Mahdi

Jacques Mongoin

Jamal Chaouki

Céline Methivier

Benoît Magny

Lhoussaine Omari

Ahmad Mohaddespour

Eugen Andreiadis

Marie-Thérèse Duchesne

Khaoula Khaless

Rachid Boulif

Abla Ouaattou

Marie-Therese Duchesne

The invention relates to a method for preparing an aqueous suspension of at least one phosphate material, comprising, dispersing, in water, particles of phosphate material in the presence of at least one additive of the anionic polymer of acrylic acid or of methacrylic acid type. The suspension according to the invention has a viscosity of less than 1500 mPa·s. The invention also relates to the conditioning of the phosphate material associated with the anionic polymer, for its subsequent treatment with at least one strong acid, for the industrial preparation of phosphoric acid.

Preparation of an aqueous suspension of phosphate material

The use of a synergistic mixture of extractants for extracting at least one rare earth element from an aqueous medium comprising phosphoric acid. The mixture comprises: —a first extractant of formula (I): wherein Rand R, which are identical or different, represent a linear or branched, saturated or unsaturated hydrocarbon group, comprising from 6 to 12 carbon atoms, or a phenyl group optionally substituted by a linear or branched, saturated or unsaturated hydrocarbon group, comprising from 1 to 10 carbon atoms; and—a second extractant of formula (II): in which Rrepresents a linear or branched alkyl group, comprising from 6 to 12 carbon atoms. Use of the synergistic mixture in the treatment of phosphate minerals with a view to recovering the rare earth elements contained in the minerals.

Use of synergistic mixture of extractants for extracting rare earth elements from an aqueous medium comprising phosphoric acid

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.

Preparation of phosphoric acid

The present invention relates to a process for decomposing calcium sulfide (CaS) into calcium oxide (CaO) and sulfur dioxide (SO), comprising:&#x2014;providing a reactor containing calcium sulfide and a source of carbon,&#x2014;oxidizing the source of carbon so as to generate carbon dioxide (CO),&#x2014;reacting the calcium sulfide with said carbon dioxide so as to produce carbon oxide (CaO), sulfur dioxide (SO) and carbon monoxide (CO) according to the following reaction: CaS+3CO&#x2dc;CaO+SO+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 O/C is comprised between 5 and 25.

Calcium sulfide decomposition process

The present invention relates to a process for decomposing calcium sulfate (CaSO) present in phosphogypsum (PG), comprising the following steps: a) providing a reactor containing phosphogypsum (PG) and a solid source of carbon (C), b) reacting a flow of dioxygen (Oz) with the source of carbon (C) so as to generate carbon oxide (CO), c) reacting carbon oxide (CO) obtained in step a) with calcium sulfate (CaSO) of the phosphogypsum to produce calcium oxide (CaO) and sulfoxide (SO) according to the following reaction: CaSO+CO&#x2192;CaO+SO+COwherein the mass ratio C/PG is between 0.2 and DA, and the mass ratio 15 O/PG is between 0.5 and 1.5.

Phosphogypsum decomposition process

In alternative embodiments, the invention provides processes and methods for the recovery, removal or extracting of, and subsequent purification of uranium from a wet-process phosphoric acid using a continuous ion exchange processing approach, where the uranium is recovered from a phosphoric acid, or a phos-acid feedstock using either a dual or a single stage extraction methodology. In both cases an intermediate ammonium uranyl-tricarbonate solution is formed. In alternative embodiments, in the dual cycle approach, this solution is contacted in a second continuous ion exchange system with a strong anion exchange resin then subsequently recovered as an acidic uranyl solution that is further treated to produce an intermediate uranyl peroxide compound which is ultimately calcined to produce the final uranium oxide product. In alternative embodiments, in the single cycle case, the intermediate ammonium uranyl-tricarbonate solution is evaporated to decompose the ammonium carbonate and produce an intermediate uranium carbonate/oxide solid material. These solids are digested in an acid medium, and then processed in the same manner as the secondary regeneration solution from the dual cycle process to produce an intermediate uranyl peroxide that is calcined to produce a final uranium oxide product.

Processes for the recovery of uranium from wet-process phosphoric acid using dual or single cycle continuous ion exchange approaches

The present invention relates to a process for producing sodium sulphate from phosphogypsum, comprising:

Process for producing sodium sulphate from phosphogypsum

Processes for the recovery of uranium from industrial phosphoric acid using dual or single cycle continuous ion exchange approaches

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Casablanca, Morocco

Driss Dhiba