The article discusses how waste slag can be recycled to produce manganese ferroalloys more efficiently. By using waste slag in the production process, the phosphorus content in the final product is reduced, and up to 60% of manganese can be extracted from the slag. This method also decreases the specific consumption of raw materials and limestone, leading to cost savings and lower phosphorus concentration in the metal. Recycling waste slag is a promising approach to make use of resources that are currently being lost.