The present invention concerns a method for purifying at least one aqueous solution of phosphoric acid continuously, comprising at least: providing, in at least one vessel, at least one solution AP derived from at least one phosphoric acid obtained by a process for wet-chemical production of phosphoric acid, said solution in said vessel being at a temperature between 65 C. and 98 C., and said solution AP comprising before said step 1: between 50% and 63% by weight of P.sub.2O.sub.5 and between 0.1% and 0.5% by weight of SO.sub.3; adding barium carbonate to said vessel, said barium carbonate having a specific particle size distribution which allows for effective flow of the barium carbonate while allowing it to have good reactivity.

The present invention concerns a method for purifying at least one aqueous solution of phosphoric acid continuously, comprising at least: providing, in at least one vessel, at least one solution AP derived from at least one phosphoric acid obtained by a process for wet-chemical production of phosphoric acid, said solution in said vessel being at a temperature between 65 C. and 98 C., and said solution AP comprising before said step 1: between 50% and 63% by weight of P.sub.2O.sub.5 and between 0.1% and 0.5% by weight of SO.sub.3; adding barium carbonate to said vessel, said barium carbonate having a specific particle size distribution which allows for effective flow of the barium carbonate while allowing it to have good reactivity.

The present application provides a method for separating and purifying phosphoric acid and phosphogypsum from a wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby. The method is beneficial for the dissociation, precipitation and separation of colloidal silicon and carbon impurities, such that the aim of in-situ removal and rapid separation of colloidal impurities to obtain the ore slurry, from which impurities have been removed, during a reaction process for outputting phosphogypsum is realized, and a low-impurity phosphoric acid product and phosphogypsum product can be obtained after the ore slurry, from which impurities have been removed, has been further treated.

The present invention concerns a method for purifying at least one aqueous solution of phosphoric acid continuously, comprising at least: providing, in at least one vessel, at least one solution AP derived from at least one phosphoric acid obtained by a process for wet-chemical production of phosphoric acid, said solution in said vessel being at a temperature between 65 C. and 98 C., and said solution AP comprising before said step 1: between 50% and 63% by weight of P.sub.2O.sub.5 and between 0.1% and 0.5% by weight of SO.sub.3; adding barium carbonate to said vessel, said barium carbonate having a specific particle size distribution which allows for effective flow of the barium carbonate while allowing it to have good reactivity.

The present invention concerns a method for purifying at least one aqueous solution of phosphoric acid continuously, comprising at least: providing, in at least one vessel, at least one solution AP derived from at least one phosphoric acid obtained by a process for wet-chemical production of phosphoric acid, said solution in said vessel being at a temperature between 65 C. and 98 C., and said solution AP comprising before said step 1: between 50% and 63% by weight of P.sub.2O.sub.5 and between 0.1% and 0.5% by weight of SO.sub.3; adding barium carbonate to said vessel, said barium carbonate having a specific particle size distribution which allows for effective flow of the barium carbonate while allowing it to have good reactivity.