Valorization of industrial by-products through thermal processes represents an efficient and sustainable solution for waste reduction and the development of new functional materials. This study investigates the potential application of cathode ray tube (CRT) glass, iron slag, fly ash from thermal power plants, and natural zeolite in sintering processes. Characterization was performed using XRF, FTIR, SEM, and TGA methods to examine the chemical, morphological, and thermal properties of the materials. The obtained results indicate complementary chemical and structural characteristics, with SiO₂ and CaO as the dominant components in the analyzed materials. TGA analysis of the mixture, conducted under a controlled temperature regime, simulated the sintering process and demonstrated the thermal compatibility of the materials. In addition to spectroscopy/microscopy, composition-based proxies (basicity, silica modulus, network former/modifier ratio, and rule-of-mixtures density), together with a stable sintering region quantified by TGA (~750-990ºC), were used to appraise sinterability and application-oriented feasibility. The results show that this multicomponent composition enables the optimization of sintered products while preserving structural stability and ensuring negligible mass loss during thermal treatment. The materials analyzed, both individually and in synergy, represent sustainable components for the development of new sintered systems, thereby contributing to advanced recycling technologies and the principles of the circular economy.