Selenium is a technologically important element widely used in semiconductor devices, photoelectric systems, glass production, metallurgy, and catalyst applications. Because selenium is rarely obtained from primary mineral deposits, its industrial production is mainly associated with the processing of copper, lead-zinc, and other polymetallic raw materials. This study evaluates the purification performance of vacuum-based selenium processing using previously reported experimental and technological data and benchmarks the results against alternative hydrometallurgical selenium recovery routes described in the literature. Particular attention is given to selenium purity, impurity removal, recovery, operating pressure, temperature, processing duration, and energy consumption. The analyzed data show that vacuum purification increased selenium content from 99.4% to 99.992%, corresponding to an absolute increase of 0.592 percentage points and a relative increase of approximately 0.596%. The total impurity concentration decreased from 2,997.38 ppmw to below 79.08 ppmw, corresponding to an impurity removal efficiency of at least 97.36% and a minimum purification factor of approximately 37.9.