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US 4,557,915 AGranted
Production of phosphoric acid
AssigneeRhone-Poulenc Chimie de Base
InventorGuy Nineuil
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AssigneeRhone-Poulenc Chimie de Base
InventorGuy Nineuil
Estimating the term…
Phosphoric acid is produced, with concomitant recovery of solids comprising compounds of fluorine and silica, by (i) acidulating a first amount of phosphate ore with a strong acid to produce a first phosphoric acid slurry, (ii) filtering said first slurry to separate the liquid phosphoric acid content therefrom, (iii) concentrating a fraction of the phosphoric acid thus separated, (iv) recovering same, and (v) condensing the evolved vapors of concentration with a liquid absorbent to produce a solution of fluosilicic acid, (vi) acidulating a second amount of phosphate ore with said solution of fluosilicic acid together with a fraction of said first slurry, or together with a fraction of the phosphoric acid separated in the step (ii), to produce a second phosphoric acid slurry, (vii) filtering said second slurry to separate both the liquid phosphoric acid content and a solids fraction therefrom, said solids fraction comprising fluorine and silica compounds, (viiia) recycling the phosphoric acid thus separated from said second slurry to the step (i), or (viiib) combining same with the fraction of separated phosphoric acid to be downstream concentrated in the step (iii).
A process for the production of phosphoric acid, comprising (a) acidulating a first amount of phosphate ore with a strong acid to produce a first phosphoric acid slurry, (b) filtering said first slurry to separate the liquid phosphoric acid content therefrom, (c) concentrating a fraction of the phosphoric acid thus separated, (d) recovering same, and (e) condensing the evolved vapors of concentration with a liquid absorbent to produce a solution of fluosilicic acid, (f) acidulating a second amount of phosphate ore with said solution of fluosilicic acid together with a fraction of said first slurry, or together with a fraction of the phosphoric acid separated in the step (b), to produce a second phosphoric acid slurry, (g) filtering said second slurry to separate both the liquid phosphoric acid content and a solids fraction therefrom, said solids fraction comprising fluorine and silica compounds essentially in the form of chukhrovite, and (h) recycling the phosphoric acid thus separated from said second slurry to the step (i) and combining same with the fraction of separated phosphoric acid to be downstream concentrated in the step (a).
A process for the production of phosphoric acid, comprising (a) acidulating a first amount of phosphate ore with a strong acid to produce a first phosphoric acid slurry, (b) filtering said first slurry to separate the liquid phosphoric acid content therefrom, (c) concentrating a fraction of the phosphoric acid thus separated, (d) recovering same, and (e) condensing the evolved vapors of concentration with a liquid absorbent to produce a solution of fluosilicic acid, (f) acidulating a second amount of phosphate ore with said solution of fluosilicic acid together with a fraction of said first slurry, or together with a fraction of the phosphoric acid separated in the step (b), to produce a second phosphoric acid slurry, (g) filtering said second slurry to separate both the liquid phosphoric acid content and a solids fraction therefrom, said solids fraction comprising fluorine and silica compounds essentially in the form of chukhrovite, and (h) combining same with the fraction of separated phosphoric acid to be downstream concentrated in the step (a).
Dependencies are inferred from the claim text.