One of the proposed options is the recycling of end-of-service-life electronics, as well as mineral waste. This trend has materialized in varied efforts and with proposals that encompass diverse fields of knowledge. In this particular, several alternative proposals are considered for the utilization of electronic scrap, such as printed circuit boards. From this perspective, the present master s study proposes to advance knowledge regarding the polymeric fraction contained in some obsolescence samples through methods usually practiced for solid materials (e.g., FTIR and TGA). The work is complemented by a detailed thermodynamic analysis of chlorination systems, using the polymeric fraction as the carbon source responsible for decreasing the oxygen potential in the reaction atmosphere. The study aims to establish conditions for understanding the raw material and the theoretical behavior of the reaction systems so that experimental saline chlorination systems can be made viable, seeking a sustainable route for selective recovery of critical metals. Therefore, the route proposed by this work presents pyrolysis at a temperature of 300 degrees Celsius in order to remove volatile compounds, release through mills, seeking an average particle size of 150 micrometers to 1700 micrometers. Use of an open furnace (presence of O2(g)), containing chlorine gas flow (Cl2(g)) for the metal chlorination system, with temperature above 600 degrees Celsius, removal of the gas flow and condensation of the concentrated metallic compounds for subsequent separation. The use of sodium chloride (NaCl) as a chlorination alternative proves promising, since it is cheaper than chlorine gas and more environmentally friendly. The worse thermodynamic performance of this reagent is acceptable, without harming the system trend.