Provided are a method of recovering phosphoric acid in the form of ammonium phosphate or a hydrate thereof from a fermentation broth or a waste liquid thereof, and/or a method of reusing the recovered phosphoric acid in fermentation.

Provided are a method of recovering phosphoric acid in the form of ammonium phosphate or a hydrate thereof from a fermentation broth or a waste liquid thereof, and/or a method of reusing the recovered phosphoric acid in fermentation.

A method for determining mixing parameters for preparing a phosphoric acid solution having a controlled content of at least one of its chemical constituents, by mixing at least two phosphoric acid solutions, each having a different content of the chemical constituent, of which at least one is a permeate resulting from the filtration of a crude phosphoric acid solution through at least one nanofiltration membrane. The method includes: (1) providing a desired content (Tm) of the chemical constituent in the phosphoric acid solution to be prepared, and a desired volume (Vm) of the phosphoric acid solution to be prepared; (2) determining, using a computer, on the basis of the desired content (Tm) and the desired volume (Vm): at least one combination of at least two phosphoric acid solutions among the phosphoric acid solutions to be mixed; volumes of each of the phosphoric acid solutions to be mixed of the combination, such that the mixing of the phosphoric acid solutions of the combination leads to the phosphoric acid solution to be prepared.

A method for determining mixing parameters for preparing a phosphoric acid solution having a controlled content of at least one of its chemical constituents, by mixing at least two phosphoric acid solutions, each having a different content of the chemical constituent, of which at least one is a permeate resulting from the filtration of a crude phosphoric acid solution through at least one nanofiltration membrane. The method includes: (1) providing a desired content (Tm) of the chemical constituent in the phosphoric acid solution to be prepared, and a desired volume (Vm) of the phosphoric acid solution to be prepared; (2) determining, using a computer, on the basis of the desired content (Tm) and the desired volume (Vm): at least one combination of at least two phosphoric acid solutions among the phosphoric acid solutions to be mixed; volumes of each of the phosphoric acid solutions to be mixed of the combination, such that the mixing of the phosphoric acid solutions of the combination leads to the phosphoric acid solution to be prepared.

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 disclosure relates to a method for producing high-purity phosphoric acid from low-purity phosphoric acid by forming pure phosphoric acid crystals using crystallization purification through quantum coupling of phosphoric acid. In particular, the present disclosure relates to a method for producing phosphoric acid capable of obtaining high-purity phosphoric acid from low-grade phosphoric acid economically and industrially by obtaining pure crystals from a phosphoric acid raw material containing a large amount of impurities through activating quantum coupling of phosphoric acid at a temperature above zero (0 C. or higher).

The present disclosure relates to a method for producing high-purity phosphoric acid through a quantum behavior control, and more particularly, to a method for producing high-purity phosphoric acid capable of obtaining high-purity phosphoric acid from low-grade phosphoric acid economically and industrially by obtaining phosphoric acid crystals by, using a temperature difference between an introduced phosphoric acid raw material and a cooling device, controlling crystal growth position and rate of the phosphoric acid crystals through changes in the molecular or quantum behaviors of phosphoric acid, water molecules and impurities in the phosphoric acid raw material to suppress a phenomenon of impurities being trapped inside the phosphoric acid crystals, and melting some of the formed phosphoric acid crystals through additionally introducing a high-temperature phosphoric acid raw material to remove the impurities trapped inside the crystals.

The present disclosure relates to a method for producing high-purity phosphoric acid through a quantum behavior control, and more particularly, to a method for producing high-purity phosphoric acid capable of obtaining high-purity phosphoric acid from low-grade phosphoric acid economically and industrially by obtaining phosphoric acid crystals by, using a temperature difference between an introduced phosphoric acid raw material and a cooling device, controlling crystal growth position and rate of the phosphoric acid crystals through changes in the molecular or quantum behaviors of phosphoric acid, water molecules and impurities in the phosphoric acid raw material to suppress a phenomenon of impurities being trapped inside the phosphoric acid crystals, and melting some of the formed phosphoric acid crystals through additionally introducing a high-temperature phosphoric acid raw material to remove the impurities trapped inside the crystals.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an ionic polymeric flocculating agent is added to a phosphoric acid containing composition subsequent to the addition of an organothiophosphorous heavy metal precipitating agent to said composition, particularly under gentle mixing conditions, such as between 100 and 300 rpm. The flocculating agent promotes the formation of agglomerates of the heavy metal containing precipitate, thus facilitating their removal from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an ionic polymeric flocculating agent is added to a phosphoric acid containing composition subsequent to the addition of an organothiophosphorous heavy metal precipitating agent to said composition, particularly under gentle mixing conditions, such as between 100 and 300 rpm. The flocculating agent promotes the formation of agglomerates of the heavy metal containing precipitate, thus facilitating their removal from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.