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-Classificação geológica das rochas ornamentais de origem ígnea estudadas neste trabalho. O diagrama "QAP" indica porcentagens relativas de Q: quartzo (SiO2), A: feldspato potássico (KAlSi3O8) e P: plagioclásios (CaAl2Si2O8) (NaAlSi3O8). Diagrama de Streckeisen (1974) para classificação de rochas graníticas.
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A produção de rochas ornamentais para revestimento gera um resíduo de granulação muito fina, a partir do descarte da Lama de Beneficiamento de Rochas Ornamentais (LBRO), cuja composição indica potencial de utilização em diversos setores produtivos. Neste trabalho, apresenta-se um estudo da variabilidade composicional da LBRO e de diferentes tipos d...
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O Brasil é um dos países que mais beneficia rochas ornamentais no mundo, grande parte dessa produção se concentra nos Estados do Espirito Santo e Minas Gerias. A lama de beneficiamento de rochas ornamentais(LBRO) é produzida no corte e polimento das rochas já laminadas, e é considerada tóxica e prejudicial ao meio ambiente. Este trabalho teve como...
O Cinturão Salvador-Esplanada-Boquim se localiza na porção nordeste do Cráton do São Francisco, nos estados da Bahia e do Sergipe, apresentando duas faixas litológicas de rochas metamórficas, denominadas Complexo Gnáissico-Migmatítico e Complexo Granulítico Esplanada-Boquim. O presente trabalho abrange os estudos de campo, petrográficos e litoquími...
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... Some authors [27] showed that a direct correlation exists between the chemical composition of the solid phase of DSPS and sawn rocks, except for some components found in the sludge of conventional looms, such as Fe, as their contents can increase by more than 400% compared with rocks that are sawn with conventional sludge. Mn, Ti, and P also increase, probably because, along with Fe, these elements exist in the steel grit and blades. ...
Brazil stands out as one of the main producers of dimension stones and, in order to maintain sustainable production, the principles of environmental sustainability have been increasingly desired. The importance of studying sludge from dimension stone processing is not only based on the economic and environmental burden that its waste disposal represents for the sector but also on the opportunity to use a material that can reduce the extraction of other mineral goods. This study aimed to describe the characteristics of this sludge at different stages of the processing to evaluate the differences between the material circulating in the production process and after dehydration, when it becomes a residue to be disposed of. Aluminum, iron, manganese, and barium concentrations were high in the liquid phase of the sludge, but they were reduced considerably in the solubilized extract. The hydrogen potential reduced, falling below the threshold of corrosivity, after the withdrawal of the liquid phase. Elements with concentrations higher than the maximum allowed value for inert wastes come from both the inputs used in the processing and the processed stone itself. Initiatives to segregate materials from different sources and investments for the creation of eco-products that can replace inputs, besides the use of wastes, should be encouraged to work towards sustainable production.
... A lama abrasiva proveniente da serragem de blocos de granitos (rochas silicatadas) e de mármores (rochas carbonáticas) do estado do Espírito Santo apresentam teor médio de SiO 2 em torno de 60 e 11% de Fe 2 O 3 . 18 A lama abrasiva é um rejeito que pode ser utilizado nos processos oxidativos avançadas (POA's) como fonte de ferro em reações do tipo Fenton para a redução de poluentes orgânicos e da cor proveniente dos corantes presente nos efluentes têxteis. Os POA's utilizam principalmente radicais hidroxila (•OH), espécie altamente oxidante. ...
APPLICATION OF ABRASIVE MUD FROM THE PROCESSING OF ORNAMENTAL ROCKS AS A CATALYST IN THE PHOTO FENTON PROCESS FOR THE DECOLORIZATION OF DYE IN AQUEOUS SOLUTION. The extraction and processing of ornamental rocks generate a very significant amount of waste, representing an environmental and public health problem. The residue is a fine-grained compound by rock powder and inputs used in the processing process have a potential economic value. The present study was carried out to evaluate the efficiency of the waste generated in the discoloration of an aqueous solution containing methylene blue dye, such as alternative for treating textile effluents. The samples were characterized by X-ray diffraction, inductively coupled plasma optical emission spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The catalytic properties of the samples were evaluated in the Fenton and photo Fenton reactions at pH 3 and natural pH. The best decolorization efficiency (≈ 95%) was achieved using the GRM catalyst at pH 3, after 5 min of photo Fenton reaction. Importantly, owing to its excellent structural and chemical stability, the samples showed a decolorization efficiency above 95% after 5 consecutive cycles of 30 min of reaction. This innovative strategy not only offers a new prospect for the rational disposal of abrasive mud waste, but also contributes to minimizing environmental impacts, promoting sustainable development in the stone industry.
... 2,3 O processo convencional gera resíduos constituídos por um pó ultrafino composto, em grande parte, pela própria rocha cominuída, além dos insumos que compõem a lama; enquanto no caso dos teares multifios, o resíduo é composto basicamente por pó de rocha e água. 4 O descarte dos resíduos da lama deve ser feito em aterros industriais, 5 pois, quando lançados de forma inadequada no ambiente podem causar danos ambientais. 6 Neste sentido, com a crescente preocupação em preservação ambiental e a busca pela economia verde, cada vez mais pesquisadores e produtores industriais têm buscado formas alternativas de destinação dos resíduos. ...
INFLUENCE OF THE PROCEDURE FOR GRANULOMETRIC SAMPLE ADJUSTMENT OF RED CERAMIC AGGREGATED WITH DIMENSION STONE WASTES FOR CLASSIFICATION ACCORDING TO THE ABNT CRITERIA’S. In order to clarify questions about the granulometric preparation of samples for the classification of solid wastes according to the Brazilian technical standard (NBR 10004/04), solubilization tests were carried out on red ceramic specimens made with conventional clay aggregated with ornamental rock residues. Samples were prepared by fragmentation and milling to verify the effects on metals releasing to the extractor medium. The specimens were made with 80% clay, 20% residue and 10% (m/m) moisture and sintered at 1000 °C. The data show that ceramics made with conventional clay, when discarded, will produce non inert wastes, as well as the ceramics made with dimension stone wastes added to the conventional raw material, according to the granulometry of its particles. After all, the metals concentration in the solubilization test are influenced by the sample granulometry. This paper shows that the method of granulometric adjustment should be detailed in the technical standard for solubilization tests (NBR 10006/04), in order to ensure the reliability of the method for classification of solid wastes.
Objective: This study evaluates the variation of pH and electrical conductivity of distilled water containing hardened mortar samples with FIBRO, artificially aged, in order to investigate the influence of ornamental rock beneficiation fines (FIBRO) in cementitious mortars. Theoretical Framework: Based on studies on waste reuse in construction, the viability of FIBRO as an alternative material is highlighted. The chemical composition of these fines may influence the physical-chemical behavior of cementitious mixtures, impacting the durability of structures. Method: Mortar specimens with and without FIBRO were molded and subjected to saturation and drying cycles in distilled water and saline solution at 28 days of age. Over six weeks, pH and electrical conductivity of the solutions were monitored to evaluate the influence of FIBRO. Results and Discussion: The mortars with FIBRO had an initial pH between 6.7 and 9.9, stabilizing at 8, without altering the distilled water. Electrical conductivity increased due to mineral leaching, especially in saline solutions. Although FIBRO does not change the pH, leaching may affect mortar durability under different conditions, as well as water quality. Research Implications: The study contributes to the characterization of FIBRO as a sustainable material and emphasizes the need to assess its chemical compatibility with cementitious materials. Originality/Value: This research expands the knowledge on mortars with FIBRO, analyzing electrical conductivity and pH stabilization, providing support for more sustainable mixtures.
The processing for dimension stone production generates a residue called Fines from Dimension Stone Processing-FIDSP. This material is considered a potential raw material for manufacturing "ecoproducts", motivating detailed studies of its composition. The aim of this work was to analyze the chemical and mineralogical characteristics of different particle size fractions of the FIDSP. Samples were analyzed for particle size fractions, chemical and mineralogical composition, the last two carried out after particle fractionation. Results show that the fraction passing the 0,053 mm aperture sieve had a relevant increasing in the loss on fire and in Ca an K contents, in addition to decrease in concentrations of Mg, Na, and Fe. Synthetic diamonds that can be reused were preserved in coarser fractions and it is necessary to control the entry of dirt that could worsen the quality of the FIDSP, if it is used as raw material.
Brazil has a worldwide prominence in the dimension stone Market, where the state of Espírito Santo participates as the main processing pole in the country. Transforming blocks of rocks in polished plates generates a large amount of waste, that has been deposited directly on the ground. The knowledge about the characteristics of soil under the waste disposal sites and in locals certainly not affected by them is requested for adequate waste management. The aim of this work was to analyze the quality of soil and the presence of potentially toxic metals in three landfills of dimension stone waste in Cachoeiro de Itapemirim County (state of Espírito Santo, Southeastern Brazil). The deposits are in different topographic positions (hilltop, slope, and valley) and the vicinity has different types of land usage. In addition to the comparison with control samples, the areas are compared with each other, and some data are compared with thresholds established by CONAMA Resolution 420/2009, as well as with the common variation of soils in the state of Espírito Santo. Interactions between waste and soil were detected by the increased pH-values; K and Na concentrations; in addition to the parameters SB, t, T, and V in sites situated in slope and hilltop. Concerning potentially toxic metals, no clear pattern was observed between their source and the waste; on the contrary, the higher metal levels in the area that receive sewage discharges indicate a possible external source of Cu, Cr, Pb, Zn, and Ni.
Keywords:
abrasive slurry; processing; environmental impacts; soil contamination
