This paper focused on the extraction of Nd (III) from acidic leach liquor obtained after monazite mineral opening by concentrated H2SO4 solution. Extraction behaviors of REEs were studied by examining extractant concentration, and the influences of experimental parameters. Total REEs in the Pregnant Leach Solution (PLS) were separated as Ce, La, Nd and Pr into the organic phases by solvent extraction (SX) process using tri butyl phosphate (TBP) as the most effective extractant. By the 5th stage of SX process, 55.94, 11.48, 14.97 and 7.61 % purity of Ce, La, Nd and Pr respectively was separated from the (PLS) by 50 vol. % TBP in kerosene, stripped by 3M NH4NO3 solution, at 0.2 pH for 5 minutes at room temperature. The mechanism of REEs extraction from the pregnant leach solution was studied for separation of light REEs and middle REEs. The produced LREEs were dissolved in concentrated HCl followed by pH adjustment to 1.8 passed in column of Dowex 50 -X8. REEs load is then eluted through the Cu-form resin column using 0.5 M Citric acid solution adjusted to pH of 3.9. Neodymium concentrates with ~ 99.9, 99.5, 98, 97.1% purity and 50, 80, 81, 82.5 % recovery can be obtained according to marketing or further chemical or technical approaches for the fractions obtained.