Patent ID: 8470270

Claim:
A method for extracting of rare earth elements from phosphogypsum by means of acid extraction, comprising mixing of phosphogypsum with a solution of mixture of sulfuric and nitric acid in a ratio from 3.2:1 to 1.2:1 by mass parts, with the concentration of each of them from 1 to 3 wt. %, with the ratio of “liquid:solid” from 4:1 to 5:1 weight parts during from 8 to 12 minutes to form a suspension, mixing the suspension, hydroacoustic effecting on the suspension simultaneously with its mixing by means of circulation the suspension through a rotary-oscillatory device with grinding of phosphogysum particles to a size from 10 to 15 microns, separating from the suspension of insoluble precipitate and obtaining an extraction solution and extracting compounds of rare earth elements from the extraction solution by means of passing the extraction solution through the cation-exchange filter.