19-11-2020 дата публикации
Номер: US20200361774A1
Принадлежит:
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. 1. 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 polymer with a molecular mass by weight (M) of between 1 ,000 and 90 ,000 g/mol and obtained by polymerization reaction of at least one acid chosen from acrylic acid , methacrylic acid and salts thereof.2. The preparation method according to claim 1 , wherein the dispersion is carried out after the phosphate rock has been crushed.3. The preparation method according to claim 1 , wherein the polymer is partially or totally neutralized claim 1 , preferably partially or totally neutralized by means of a derivative comprising at least one element chosen from lithium claim 1 , sodium claim 1 , calcium claim 1 , magnesium and mixtures thereof claim 1 , more preferably chosen from sodium claim 1 , calcium and mixtures thereof.4. The preparation method according to claim 1 , wherein the anionic polymer is obtained by a polymerization reaction also using at least one other acid chosen from acrylic acid claim 1 , methacrylic acid claim 1 , maleic ...
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