Abstract:
The mining sector is essential to the economy, driving technological and scientific progress, although it has negative environmental impacts due to the waste generated. This study proposes a possible recycling route for mining waste, focusing on the recovery of metals after comparative leaching with technical standards, with the aim of classifying the slag resulting from the reduction of Iron/Nickel (FeNi) and achieving the recovery of metallic waste, contributing to the sustainable disposal of mining waste. The sample was comminuted to a particle size of 0.3mm. A 1N NaOH solution was used as a leaching agent for 100g of the material. A Wagner shaker (18h, 30 rpm) and a vacuum filtration system were used for collection after the test. The dry retained materials, filtered and washed solutions were analyzed by XRD, XRF and ICP, revealing the presence of Forsterite, a mineral of magnesium and iron silicates, and elemental contents of Si, Mg, Fe and Ni of 19%, 18%, 15% and 0.14% respectively. With regard to the total chromium parameter, a value above 5mg/L established by the NBR 10004 standard was found. The levels of Al, Fe and Mn were also above the permitted standard