This review examines the current status and future prospects of technical-grade selenium purification technologies based on published scientific literature. The physicochemical principles and technological capabilities of vacuum distillation, fractional crystallization, zone refining, and combined processes involving oxidation, sublimation, dissolution, and reduction are discussed. These approaches are comparatively assessed in terms of impurity separation selectivity, product purity, selenium recovery, and potential for industrial application. Particular attention is given to the effects of feed composition, impurity speciation, and operating conditions on purification performance. The review emphasizes the need to distinguish product purity from selenium recovery and to account for analytical detection limits when interpreting reported results. Proposed research priorities include integrating complementary purification stages, establishing material and energy balances, and extending pilotscale validation. Energy efficiency and environmental advantages should be substantiated through measured performance indicators at equivalent product quality. The analysis provides a framework for selecting and developing purification routes suited to specific feed materials and product requirements.