Since the introduction and use of converter technologiesTechnology, e.g., TBRC (Top-Blown Rotary Converter)Top-Submerged Lance (TSL) and TSL (Top Submerged Lance) bath smelting technologyBath smelting technology in the non-ferrousFerrous metalsMetal industry, top lance and/or injectorInjector systems have become a key component of such facilities. Depending on the process conditions (e.g., immersed or top blowing), the designDesign of the lance and its component parts (e.g., nozzles) can be particularly complex and influence the hydrodynamics of the melt, which in turn affects important process parameters such as the reaction kineticsKinetics, heat transfer, splashing, surface areaSurface area between gas and slagSlag phase, and ultimately the efficiencyEfficiency of the metallurgical process. The BlueSmelterBlueSmelter (BS), which features an advanced injectorInjector system, is the new bath smelting technologyBath smelting technology developed by SMS group for the non-ferrousFerrous metalsMetal industry. It is designed for e-waste recyclingRecycling, fuming processes, and primary smeltingSmelting. This paper presents the development of a novel pyrometallurgical bath smeltingSmelting concept with a focus on the new advanced injectorInjector system. Sequential designDesign, simulation, and pilot test phases were carried out to optimizeOptimize the industrial BlueSmelterBlueSmelter bath process. As regards the application of the injectorInjector system in the BlueSmelterBlueSmelter, flow characteristics are discussed under various operational conditions covering bubble formationFormation, gas penetration depth, melt splashing, and bath mixing. Computational fluid dynamics (CFDComputational Fluid Dynamics (CFD)) is used extensively for this purpose to better understand the phenomena underlying the whole pyrometallurgical process. In addition, special attention is paid to a detailed description of the structure, mode of operationOperation, and special features of the SMS group injectorInjector system.