Aproveitamento de rejeito de pedreira de rocha granítica para o uso em rochagem

Abstract

Stonemeal is based on the principle of diversifying nutrient sources, creating new supply options, such as the incorporation of rocks and/or minerals into the soil, and can be considered as a type of remineralization, where rock dust is used to rejuvenate poor soils. or leached, basically based on the search for balance in fertility, conservation of natural resources and sustainable productivity. This rock gem technique is used in soil fertilization through the application of comminuted rocks, where it can partially or totally replace the use of chemical fertilizers. The methodology adopted in the work consisted of the characterization of the waste from the production of gravel through physical, chemical and mineralogical analyses, namely, granulometric analysis, analysis by x-ray fluorescence spectroscopy, optical microscopy, x-ray diffraction, analysis of material fertility, soil and waste incubation experiment to identify and improve soil chemical parameters. Results indicate that the material under study is within almost all the parameters required following the regulation nº 5/2016 of the Ministry of Agriculture for use as a soil remineralizer. The granulometric analysis of the material under study indicates that this quarry waste fits the specification of physical nature of remineralizers according to IN MAPA No. 05/2016, provided that the granulometric fraction > 4.8 mm undergoes a comminution operation. The tailings samples show high levels of K₂O between 7% and 9%. In the present work it was indicated that the quarry tailings have an estimated free SiO2 of 40% using optical microscopy within the required tolerance. Regarding the toxic elements present in the waste sample, no significant values in ppm above the minimum were identified. The minerals identified in the tailings sample under study through the X-ray diffraction method were Muscovite, Microcline, Quartz and Albite. The results referring to petrography by optical microscopy identified minerals such as quartz, orthoclase, plagioclase, biotite and muscovite. Petrographic results resemble X-ray diffraction results. The incubation of the soil with the waste made were adherent for most of the analyzed parameters.