Um estudo dos subprodutos e rejeitos do Xisto por Ressonância Paramagnética Eletrônica

Abstract

In Brazil there are three major sedimentary basins and one of them is a sedimentary basin of Parana, which covers several states. Based on environmental concerns and reuse of waste accumulated there, spectroscopic techniques can be used to better characterize the byproducts of ore tailings and oil shale exploited, extracted this basin, in the portion of Irati formation, a mining of Petrobras, the Petrosix, installed since 1970, which transforms the organic matter contained in the ore in oil, gas and water. Samples of calschist (CS) shale fine (SF) and retorted shale (RS) were collected in different stages of the process there developed (from the mining to pyrolysis) and after macerated and broken down into sieve of 1mm to are calcined at different temperatures (200, 400 and 700 C) and washed in hydrogen peroxide (H2O2) to study the organic radical. Using Electronic Paramagnetic Resonance (EPR) were observed signs of Fe3+, Mn2+, as well as the organic radical in g = 2,003. A sign in g = 2,000 ± 3 was observed in samples of CS and SF, both in the samples calcined and in not calcined. When done the washing with H2O2 in the samples, this signal appears both in samples of CS and SF as well as the sample of the RS. This signal can be attributed to a defect in the structure of the quartz.