This article analyzes the scientific and technical foundations and practical significance of regeneration technologies for sand molding mixtures used in foundry production. The problems of restoring quartz sand and residual binders that lose their properties under the influence of high temperatures and mechanical stresses during the casting process are examined. It is substantiated that disposing of used mixtures as waste leads
to negative economic and environmental consequences. The paper provides a comparative analysis of mechanical, thermal, and chemical regeneration methods, describing their operating principles, advantages, and disadvantages. It is noted that the mechanical method is characterized by energy efficiency; however, its cleaning efficiency is limited. The thermal method ensures high-quality purification but requires significant energy consumption. Chemical methods, in turn, involve the use of special reagents. Based on scientific sources, it is shown that up to 70–95% of regenerated sand can be reused in the preparation of new molding mixtures.