Preparation of an aqueous suspension of phosphate material
AssigneesCoatex, Ocp SA
InventorsDriss Dhiba, Benoît Magny, Hamid Mazouz, Céline Methivier, Jacques Mongoin
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Abstract
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.
Claims23
A method for preparing an aqueous suspension of at least one phosphate material, the aqueous suspension having a Brookfield viscosity, measured 90 s after preparation, at 25° C., at 100 rpm and at a concentration of phosphate material of more than 45% by weight, which is less than 1,500 mPa·s, the method comprising the dispersion in water of particles of phosphate material whose size is between 10 and 400 μm, in the presence of at least one anionic non-sulfonated polymer with a molecular mass by weight (MW) of between 1,000 and 90,000 g/mol and obtained by polymerization reaction, in absence of acrylamide, of at least one acid chosen from acrylic acid, methacrylic acid and salts thereof, and optionally at least one other comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid and salts thereof, styrene, vinylcaprolactam, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylate, and aryl acrylate, wherein the amount by weight (dry/dry) of anionic polymer used is between 0.05 and 5% based on the amount of phosphate material.
An aqueous suspension of at least one phosphate material, having a Brookfield viscosity, measured 90 s after preparation, at 25° C., at 100 rpm and at a concentration of phosphate material greater than 45% by weight, which is less than 1,500 mPa·s, the aqueous suspension comprising water and particles of phosphate material having a size of between 10 and 400 μm and dispersed in the presence of at least one anionic non-sulfonated polymer with a molecular mass by weight (MW) of between 1,000 and 90,000 g/mol and obtained by polymerization reaction, in absence of acrylamide, of at least one acid chosen from acrylic acid, methacrylic acid and salts thereof and optionally at least one other comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid and salts thereof, styrene, vinylcaprolactam, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylate, and aryl acrylate, wherein the amount by weight (dry/dry) of anionic polymer used is between 0.05 and 5%, based on the amount of phosphate material.
A method for conditioning a phosphate material, for its subsequent treatment at a temperature ranging from 40 to 100° C. by means of at least one strong acid, comprising contacting the phosphate material with at least one anionic non-sulfonated polymer with a molecular mass by weight (MW) of between 1,000 and 90,000 g/mol and obtained by polymerization reaction, in absence of acrylamide of at least one acid chosen from acrylic acid, methacrylic acid and salts thereof and optionally at least one other comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid and salts thereof, styrene, vinylcaprolactam, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylate, and aryl acrylate, wherein the amount by weight (dry/dry) of anionic polymer used is between 0.05 and 5%, based on the amount of phosphate material.
Dependencies are inferred from the claim text.