Separation method of tellurium and selenium, and preparation method of tellurium using the same

A preparation method of tellurium (Te) separated from selenium (Se), comprising the steps of:

• preparing a dissolved solution of a material comprising tellurium (Te) and selenium (Se) by dissolving the material in a solution comprising a strong acid (1);
• preparing a pre-treatment solution by adding a base to the dissolved solution to adjust a pH of the dissolved solution to a range of 1.0 to 1.5 (2);
• allowing the pre-treatment solution to comprise oxalate ions (C2O42−) and preparing a complex compound solution in which a complex compound is formed by reacting tellurium ions and selenium ions in the pre-treatment solution with the oxalate ions, respectively (3);
• obtaining a first extraction solution as an organic phase prepared by a solvent extraction method which uses a neutral extractant to selectively transfer a tellurium oxalate complex compound in the complex compound solution as an aqueous solution phase to the neutral extractant as an organic phase (4);
• and
• preparing a second extraction solution as an aqueous solution phase, which comprises tellurium ions prepared by stirring with an acid aqueous solution for reverse extraction the first extraction solution which is phase-separated to transfer tellurium contained in the first extraction solution as an organic phase to the acid aqueous solution (5).