This article highlights the scientific and practical research conducted at the “Uzbekistan Metallurgical Technology Plant” JSC on the modern technology for producing tungsten VI oxide powder. The research investigated the possibilities of hydrometallurgical processing of tungsten cakes separated during the tungsten production process. The effectiveness of WO3 conversion to solution at the leaching and washing stages has been determined, and calculations have been carried out in laboratory and small-scale industrial experiments. The results served as the basis for proposing the hydrometallurgical chemical leaching process as an effective method for re-extracting WO3.