KR850001012A - Separation Method of Boric Acid - Google Patents

Abstract

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Description

Separation Method of Boric Acid

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1 shows the pH dependence of the amounts of boric acid, sulfate and chlorine ions in seawater adsorbed on hydrous cerium (IV) oxide according to the present invention,

2 shows the relationship between pH and desorption rate of a solution for desorbing boric acid ions from hydrous cerium (IV) oxide to which boric acid ions are adsorbed.

Claims (51)

Boric acid by adsorption, characterized in that the borate ion-containing water having a pH of about 5-11 is brought into contact with an adsorbent containing at least one compound selected from the group of hydroxides and hydrous oxides of the rare earth element. Ion Separation Method. The method of claim 1, wherein the adsorbent is regenerated by contacting a desorbent having a borate ion adsorbed with a desorption solution having a pH of about 2-4 or 12-14. The method of claim 2, wherein the regenerated adsorbent is washed with water at a pH of about 5-10 to obtain an adsorbent that does not actually contain borate ions. The method of claim 2, wherein the desorption solution is an aqueous solution having a pH of about 2 to 4 containing at least one inorganic anion selected from halogen anion, sulfate ion, cut acid ion and phosphate ion and at least one organic anion selected from oxalate anion and acetate anion. The at least one organic amine of claim 2, wherein the desorption solution is selected from inorganic alkalis and primary alkylamines, secondary alkylamines, tertiary alkylamines and hydroxylalkylamines selected from ammonium hydroxide, potassium hydroxide, sodium hydroxide and calcium hydroxide. A solution containing a pH of about 12-14. contacting a borate ion-containing water having a pH of about 5-11 with an adsorbent containing at least one compound selected from hydroxides and hydrous oxides of rare earth elements and adsorbents having boron ions adsorbed with a pH of about 2-4 Or (B) alternately repeating the step (B) of contacting with a desorption solution of 12-14 to desorb the boric acid ions. 7. A process according to claim 6, characterized in that the step (C) of separating the adsorbent with boron ions adsorbed from the water after step (A). 8. The process according to claim 7, wherein the adsorbent separated after step (C) is washed with water to remove borate ion-containing water. 7. A process according to claim 6, characterized in that the step (E) of separating the adsorbent with boron ions adsorbed from the desorption solution after step (B). 10. The process according to claim 9, wherein the separated adsorbent after step (E) is washed with water having a pH of about 5-11 to obtain an adsorbent that does not actually contain boron ions. The method according to claim 1 or 6, wherein the boric acid ion-containing water is seawater, saline or brine. 12. The method of claim 11, wherein the carbonate ion is removed prior to contacting the borate ion-containing water with an adsorbent. The method of claim 11 or 12, wherein the pH of the boric acid-containing water is about 7-9.5. The method of claim 6, wherein the desorption solution is an aqueous solution of an inorganic alkali or an organic amine. 15. The method of claim 14, wherein the inorganic alkali is ammonium hydroxide, potassium hydroxide, sodium hydroxide or calcium hydroxide. The method of claim 15, wherein the inorganic alkali is sodium hydroxide. 7. The method of claim 6, wherein in step (B) inorganic or organic anions are added to the desorption solution having a pH of about 2-4. 18. The method of claim 17, wherein the inorganic anion is a halide anion, sulfate ion, nitrate ion or phosphate ion. 19. The method of claim 18, wherein the inorganic anion is sulfate ion. The method of claim 17, wherein the amount of inorganic or organic anions is about 0.5-1000 mM / l. The method according to claim 1 or 6, wherein the rare earth element is at least one metal selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. . 22. The method of claim 21 wherein the rare earth element is Ce (IV). The method of claim 21 wherein the rare earth element is La. The method of claim 21 wherein the rare earth element is Y. The method of claim 21 wherein the rare earth element is Sm. 22. The process of claim 21 wherein the hydroxides and hydrous oxides of the rare earth elements are derived from rare earth chlorides. 22. The method of claim 21 wherein the hydroxides and hydrous oxides of the rare earth elements are derived from Ce concentrates. 22. The method of claim 21 wherein the hydroxides and hydrous oxides of the rare earth elements are derived from Y concentrates. The method of claim 21 wherein the hydroxides and hydrous oxides of the rare earth elements are derived from Sm-Gd concentrates. The method of claim 1 or 6, wherein the hydroxide and hydrous oxide are supported on a porous carrier. The method of claim 30, wherein the porous carrier is an organic polymer. The method of claim 31, wherein the organic polymer is a hydrophilic polymer. 33. The method of claim 32, wherein the hydrophilic polymer is polyacrylonitrile, polyamide, cellulose resin, polysulfone or vinyl chloride-vinyl alcohol copolymer. The method of claim 30, wherein the adsorbent material is spherical. The method of claim 34, wherein the average diameter of the adsorbent is about 0.1 mm to 5 mm and the porosity is about 0.5 to 0.85. Method for preparing an adsorbent for separating boric acid ions dissolved in water, characterized in that one or more salts of at least one rare earth element are dissolved in water to obtain a solution, and an alkali solution is added to the solution to obtain a precipitate. . 37. The method of claim 36, wherein the rare earth element is at least one metal selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. 38. The method of claim 37, wherein the rare earth element is Ce. 38. The method of claim 37, wherein the rare earth element is La. 38. The method of claim 37, wherein the rare earth element is Sm. 38. The method of claim 37, wherein the rare earth element is Y. 37. The method of claim 36, wherein the salt of the rare earth element is a rare earth chloride. 37. The method of claim 36, wherein the salt of the rare earth element is a Ce concentrate. 37. The method of claim 36, wherein the salt of the rare earth element is a Y concentrate. 37. The method of claim 36, wherein the salt of the rare earth element is an Sm-Gd concentrate. 37. The method of claim 36, wherein the salt of the rare earth element is water soluble. 47. The method of claim 46, wherein the water soluble salt is at least one salt selected from chlorides, sulfates and nitrates of rare earth elements. 37. The method of claim 36, wherein the water contains borate ions. The method of claim 36, wherein the precipitate is dried at a temperature of about 150 ° C. or less. 50. The method of claim 49, wherein the dried precipitate is dispersed in a hydrophilic polymer solution and the resulting mixed solution is solidified with water to form particles. 51. The method of claim 50, wherein the hydrophilic polymer is at least one polymer selected from polyacrylonitrile, polyamide, cellulose resin, polysulfone, and vinyl chloride-vinyl chloride copolymer. ※ Note: It is to be disclosed based on the initial application.