Method for recovering metal values from mixed-metal aqueous solutions by selective phosphate precipitation.

摘要

A method is provided for recovering metal value from a mixed-metal aqueous solution by selective phosphate precipitation comprising adjusting the pH of the solution to be below a predetermined pH level at which level the metal value to be removed will not be precipitated; adding to the solution stoichiometric multiples of phosphate to precipitate the metal value to be removed at the predetermined pH level; maintaining the temperature of the solution at a predetermined constant level of precipitating the metal value; increasing the pH of the solution to the predetermined pH level to precipitate the phosphate of the metal value to be removed; maintaining the pH of the solution at the predetermined pH level.