Luiz Carlos Bertolino

Centro de Tecnologia Mineral | CETEM · Coam

RESUMO - A remineralização é um processo de renovação de solos agrícolas a partir da aplicação de rochas silicáticas moídas ricas em bases, onde ocorre a disponibilização de nutrientes necessários para o desenvolvimento das plantas, formam novas fases minerais funcionais e contribui para o incremento do pH do solo. Os remineralizadores de solos pod...

The demand for high purity feldspars with low contaminant content, especially for use in the manufacture of porcelain tiles and white crockery, poses a challenge for processing the ore. Due to the need for very low iron levels, less than 0.15%, operations must be more complex, costly and capable of providing a high purity final product. To this end...

RESUMO - Os municípios de Conselheiro Lafaiete, Caranaíba e Cristiano Otoni, no estado de Minas Gerais, estão inseridos na compartimentação tectônica denominada de Cinturão Mineiro. Esta região é considerada como uma extensão da Província Pegmatítica de São João del Rei, conhecida pelas suas mineralizações de Sn, Nb, Ta e Li. As principais unidades...

Palygorskite has attracted particular attention as a specialized adsorbent due to its high specific surface area, porous texture and abundant surface groups, but its processing for commercial products makes the resulting material more expensive. In this scope, the aim of this work is to evaluate the potential of Brazilian naturally occurring palygo...

Clay minerals are suitable matrices to anchor organic molecules such as antimicrobial peptides (AMPs) so that their bioactivity is maintained, enabling the formation of new materials with potential for new applications in biotechnology. The objective of the present study was to develop a nanostructured film where the properties of palygorskite (Plg...

Chromium represents a serious threat to living organisms and ecological system. Thus, this removal from wastewater is an urgent concern. The present study evaluates the ability of the functionalized clay mineral palygorskite (PalSIL) to remove the Cr(III) ion under different experimental conditions as a function of process variables: contact time,...

The present study aimed to propose a new cause of odorous compounds release, i.e., the presence of antibiotics in water bodies and its toxicity to cyanobacteria, known to be the main producer of geosmin (GEO) and 2-methylisoborneol (2-MIB). Therefore, a literature review was carried out regarding the problems caused by antibiotics in aquatic enviro...

Na Serra do Espinhaço Meridional a foliação regional foi gerada durante o pico metamórfico do orógeno Araçuaí-Oeste Congo, entre 575 e 565 Ma. A inversão tectônica da bacia Espinhaço, contemporânea ao pico metamórfico, afetou o pacote sedimentar, o embasamento e as soleiras e diques básicos tonianos da Suíte Pedro Lessa. Nas soleiras básicas clorit...

The solid waste generated by the disposal of plastic materials has become one of society’s major problems in recent years. In this sense, several researchers have sought alternatives to minimize environmental pollution. A promising option would be using natural materials, biopolymers, or a mixture of these, also known as composites. In this study,...

Alluvial gold has been extracted from the Paraíba do Sul river since the last century, although no primary gold ocurrence is known in the wide river basin which drains mountain ranges and a Cenozoic tectonic valley. We analysed gold grains from heavy min-ral concentrates from dredge operations in the Paraíba do Sul river near Itaocara and Aperibé,...

Landscapes are systems undergoing constant transformation, associated with different forms of environmental disturbances. Among these disturbances are fires, which depending on the magnitude and frequency can have effects with different severities. In the district of São Pedro da Serra, in the municipality of Nova Friburgo, located in the mountain...

The present work sought to investigate the applicability of the microCT scanning beyond petrophysics in oil and gas industry. We analysed external features (morphology) with all their nuances, and internal features such as mineral inclusions and vugs, in micrometric alluvial gold grains from one of the largest rivers in Southeastern Brazil. Owing t...

The solid waste generated by the disposal of plastic materials has become one of society's major problems in recent years. In this sense, several researchers have sought alternatives to minimize environmental pollution. A promising option would be using natural materials, biopolymers, or a mixture of these, also known as composites. In this study,...

This study presents a novel method for quantitatively determining water content in fuel ethanol utilizing a colorimetric device composed of the methylene blue solvatochromic dye adsorbed on palygorskite, supported by filter paper. The quantitative analysis was based on digital images of the prepared support, wherein the hydrated ethanol interacted...

O mineral ilmenita (FeTiO3) corresponde a um dos principais portadores de Ti, e perfaz 90% do consumo mundial desse elemento. China e Austrália detém 50% das reservas mundiais medidas de ilmenita. No Brasil, as principais jazidas estão localizadas nos municípios de Mataraca (PB), São Francisco de Itabapoana e São João da Barra (RJ), todas em ambien...

Polyoxyalkylenes are widely studied as clay swelling inhibitors. Although many additives are available, the operations require more efficient formulations. This work synthesized and characterized two of molecules: poly(ethylene glycol)(PEG) modified with hydrocarbon chains of different lengths; and poly(amidoamine) dendrimers(PAMAM) and PEG-modifie...

The aim of this study is to evaluate the effect of mercerization of castor cake on the tensile and biodegradation behaviour of LDPE and LDPE/PHB composites. Polymer composites filled with raw castor cake (CC) and castor cake treated with 5% NaOH solution (MCC) were developed and the tensile and biodegradation behaviour of the materials obtained wer...

Halloysite (Al2Si2O5(OH)4.2H2O) is a polymorphic kaolinite mineral whose predominant morphology is tubular. Due to this characteristic, halloysite is widely used in industrial applications, such as manufacture of silica- luminous catalysts, used for industrial chemical reactions; French porcelain; and the cracking of petroleum fractions into gasoli...

In the present research, high-density polyethylene (HDPE) and polyester, poly(ethylene terephthalate) (PET), residue from platforms offshore, were blended in the presence of a coupling agent, a polyethylene-grafted maleic anhydride (HDPE-g-MA). The HDPE/HDPE-g-MA/PET blends were processed by melt mixing in a twin-screw extruder, using a factorial d...

Abstract Glyphosate affects ecosystems due to exposure of non-target crops and is a persistent contaminant at low concentrations. The application of palygorskite to reduce glyphosate contamination in Brazil is an environmentally friendly way to remediate impacted areas. This research evaluated palygorskite application for glyphosate adsorption pres...

The use of aerogeophysics applied to mineral exploration constitutes an important tool in investigation of metalliferous deposits. In this sense, the present study was motivated by a 720-ppm vanadium anomaly, associated with metagabbroic rocks inserted in the context of the Paleoproterozoic basement of the Ribeira Belt, south of Minas Gerais state,...

The Codó Formation is an Aptian marine-influenced lacustrine depositional system in the Parnaíba Basin (Brazil). This unit is an important sedimentary succession because of the high organic matter content and for being an ancient analog for the depositional systems of the Brazilian Pre-salt interval. However, mineralogical and lithogeochemical stud...

Palygorskite is a clay mineral with structural units forming ribbons, whose economic importance is directly related to its unusual structure and physicochemical properties, which give it a wide variety of uses in industry. The formation stability field of palygorskite is very limited, which makes deposits of this clay rare around the world. In Braz...

A pesquisa relaciona-se a uma investigação tecnológica de uma amostra run-of-mine de palygorskita proveniente de uma nova ocorrência em Guadalupe, estado do Piauí, Brasil e consistiu em beneficiamento e classificação granulométrica a úmido em 45 e 20 µm, com posterior separação magnética da alíquota com tamanho de partícula inferior a 20 µm. As fra...

In the southernmost São Francisco Craton, the well-exposed Archean to Paleoproterozoic basement shows kimberlite bodies that represent the last southeastern clusters associated with the Azimuth 125° structure. The absence of Mesozoic to Cenozoic overlying cover rocks in the region allows in-depth aeromagnetic geophysical interpretation of the struc...

Placer gold recovered from the Paraíba do Sul River, which flows along a high-grade shear zone in northern Rio de Janeiro, Brazil, has a distinctive component of palladiferous gold. Its finding, reported for the first time in the state of Rio de Janeiro, implies a hydrothermal system of high salinity at relatively low temperatures, in which metal t...

The objective of this work was to investigate the adsorptive potential of a previously benefited and characterized brazilian montmorillonite sample, regarding amoxicillin trihydrate removal, a zwitterionic species, present in aqueous solutions. 500 mg capsule of antibiotic was properly characterized by XRD, FTIR, SEM/EDS and surface charge measurem...

Objetiva-se, aqui, avaliar o efeito do manejo do fogo nas transformações das propriedades físicas (granulometria e porosidade), químicas (matéria orgânica e pH) e mineralógica do solo. O estudo foi desenvolvido no distrito de São Pedro da Serra – Nova Friburgo/RJ, área de predomínio da agricultura de corte e queima, com presença de relevo formado p...

O Membro Crato e a Formação Codó são parte do registro Aptiano das bacias do Araripe e Parnaíba, respectivamente. A mineralogia das argilas e a litogeoquímica são ferramentas importantes para o estudo ambientes sedimentares, sendo poucos trabalhos realizados nessas unidades utilizando tais técnicas. Esse estudo tem como objetivo a caracterização mi...

Several gold deposits display complex Bi-bearing mineralogy. Bismuth-bearing phases are generally sensitive to changes in physicochemical conditions such that the interpretation of Bi–Au associations is useful to understand these mineralizing systems. However, gaps in the physicochemical constraints given by the Bi enrichment in these systems preve...

The competitiveness between institutions and companies generates the need to cheapen products and services and facilitate their production. Thus, several companies establish partnerships with specialized university laboratories in order to promote the optimization of their processes. These laboratories, in order to guarantee their reliability, ofte...

Poly(vinylidene fluoride) (PVDF) is a commercial polymer used as an internal pressure sheath for offshore flexible pipes. A hybrid system based on PVDF was developed for offshore applications with 1, 2.5 and 5% by weight of nanoclay grade montmorillonite (OMMT) (polar and non-polar grades) by melting processing. The study was based on the effect of...

Palygorskite clay mineral (Pal) was employed in the removal of Congo red (CR) and methylene blue (MB) dyes pollutants in aqueous effluents by the adsorption process. The materials, Pal raw and acid Pal (Apal), were characterized by SEM, EDX, XRD, XFR, FTIR, XPS and Raman spectroscopy techniques that evidenced the main active sites of clay mineral....

This study consists of an ecotoxicological assessment related to one the most important environmental Brazilian disasters: the failure of an iron mining dam of the Vale S.A. in Brumadinho (Minas Gerais State, Brazil). Tailing samples (mixed with many other materials) were collected in three areas: (i) Zona Quente (n = 9) – close to the dam collapse...

Our previous work reported that palygorskite has potential for application as metal cations adsorbent due to its chemical and mineralogical properties. In this work, kinetic study and adsorption isotherms were performed in order to evaluate Pb (II) ions adsorption rate, maximum capacity and type of adsorption by using palygorskite as adsorbent. Ads...

The accumulation of heavy minerals along a part of the southeastern Brazilian coast (northern coast of Rio de Janeiro State, Brazil) provides insight into sedimentary provenance and transport by longshore drift. In particular, recent work has focused on heavy minerals as tracers to determine sedimentary sources and transport pathways, indicating a...

Analysis of the climate of a city or region is important to understand the behavior of the meteorological variables as well as other information that can help formulate policies to support the population. This document continues the work regarding climatic characterization of the municipality of São Gonçalo, located in the Rio de Janeiro Metropolit...

The Aptian Crato Member of the Araripe Basin is a 50-m-thick succession of laminated limestones alternated with siliciclastic rocks. This unit has been receiving attention worldwide mainly because it is one of the most famous fossil Konservat-Lagerstätten, where were identified well-preserved paleofauna and paleoflora. Clay mineralogy and lithogeoc...

As pesquisas realizadas na Bacia do Paraná visando o potencial gerador de gás das rochas do Devoniano Inferior ainda correspondem a novas fronteiras de estudos. Para ocorrer uma exploração bem sucedida de um play de shale é necessário conhecimento sobre qual é a quantidade de gás que pode ser extraído até a superfície e o seu respectivo custo assoc...

The incorporation of drugs in nanocomposites can be considered a potential strategy for controlled drug release. In this study, a nanocomposite based on bacterial cellulose and the palygorskite clay (BC/PLG) was produced and loaded with metronidazole (MTZ). The samples were characterized using X-ray diffraction (XRD) Spectroscopy, thermal analysis...

Metabasic sills and dikes of the Pedro Lessa Suite in the Espinhaço Range are related to a continental rifting during the Tonian. One of the thickest sills of the Pedro Lessa Suite, were named the Alto do Paiol Sill, is located 7km west of the Serro town and is 40km long, 3km wide and up to a thousand meters thick. The intrusive body and its contac...

This work presents the results of the physical characterization of palygorskite and its adsorptive behaviour for three solvatochromic dyes (Nile blue chloride (NBC), methylene blue (MTB) and dithizone (DTZ)). Adsorption isotherms were used to determine the maximum adsorption of the solvatochromic dyes on the palygorskite. The characterization of pa...

Full paper access until May, 2021 at https://authors.elsevier.com/c/1cjmd6hTLQgXY- Objective This study explores the chemical composition and surface aspects of fossilized dental calculus from the South American Quaternary proboscidean Notiomastodon platensis and the first record of fossilized oral bacteria from extinct megafauna. Materials Bloc...

Fe-Mn oxides and hydroxides mineral occurrences in the Southern Espinhaço Range are usually attributed to supergene enrichment of the Espinhaço Supergroup metasedimentary rocks and younger metaigneous basic dikes. Detailed mapping and mineralogical characterization in three target areas near the Diamantina Plateau, a relict Cenozoic erosional surfa...

O Complexo Juiz de Fora (CJF) foi definido como uma associação de rochas plutônicas de idade paleoproterozóica. Rochas metabásicas são comuns no complexo, como o complexo acamadado de Ipanema (MG). Neste trabalho foi investigado corpo de metagrabronorito com espessura expressiva entre Astolfo Dutra e Descoberto (Leste de Minas Gerais), buscando oco...

Halloysite is a 1:1 dioctahedral clay mineral that has been studied widely for applications in nanotechnology and as a mineral exploration guide for recognizing regolith-hosted heavy rare earth element ( HREE ) deposits. In Brazil, pegmatites from the state of Rio de Janeiro have been catalogued, but their potential to host halloysite deposits has...

This work aimed to evaluate the effect of acid mist on microbial communities developed on mortar with same composition from the wall of the National Museum in Rio de Janeiro. Five autochthonous microbial groups were inoculated on coated with acrylic paint and uncoated mortar surfaces and submitted to acid mist or water mist for 100 days. A heteroge...

Brazil has significant reserves of precious stones, especially those from the Eastern Pegmatitic and Borborema Provinces, such as paraiba tourmaline, emerald and imperial topaz. Corundum exploits (ruby and sapphire) are still reduced in the country and are located mainly in the states of Mato Grosso, Goiás, Santa Catarina and Minas Gerais. Mineral...

The thermal effects of an igneous intrusion on organic-rich sedimentary rocks can be considering an important source of maturation of organic matter. The Permian Irati Formation of Paraná Basin (Brazil) is a carbonatic and organic-rich shale sequence intruded by Jurassic-Cretaceous basic rocks. This study reports possible effects of igneous intrusi...

A PVDF grade typically used in offshore applications was annealed at 70, 90 and 120°C. The samples were characterized and it was observed a small change in the crystallinity, but, on the other hand, the Elastic modulus of the sample annealed at 120°C increased from 1.52 to 1.85 GPa. The relaxations observed by Dynamic Mechanical Analysis (DMA) indi...

This study reports the mineralogical characterization of kaolin occurrences in the State of Rio de Janeiro, Brazil, to identify new kaolinite and halloysite deposits. Samples were collected in 10 pegmatites with varying sizes for X-ray diffractometry, chemical analysis by X-ray fluorescence, and scanning electron microscopy studies. The results ind...

Polylactide (PLA) is an eco-friendly biodegradable thermoplastic with excellent processability, demanding less energy to be produced compared to the petroleum-based polymers. However, PLA has drawbacks that impose some restrictions of uses use such as poor toughness property. Blending PLA with other polymers is a more practical and economic way to...

The potential mobility of Cd, Cr, Cu, Ni, Pb and Zn in soils severely impacted by inadequate storage of industrial wastes in Rio de Janeiro State (Brazil) was evaluated by applying the Toxicity Characteristic Leaching Procedure (TCLP). This procedure allowed the estimation of toxicity risks for Cd, Cr and Pb. In a contamination hotspot within the s...

Rock dust contains nutrients that can improve the nutritional development of plants. Thus, the objective was to evaluate the availability of phosphorus (P) and potassium (K) through rock powders collected in different locations and their effects on the development of corn plants. Three sources of rock powders were used [collected in Campo Alegre de...

Nanocomposite materials have been proposed to enhance the properties of different materials. In this study, palygorskite (Pal) clay is proposed as a support matrix for silver nanoparticles stabilised with cashew gum (Anacardium occidentale L.) (AgNPs-CG), producing the Pal/AgNPs-CG nanocomposite, whose bactericidal activity was studied. AgNPs-CG wa...

Caulim é uma rocha de granulometria fina, coloração branca e composta essencialmente por caulinita, halloysita ou algum de seus outros politipos, sendo utilizado principalmente nos segmentos de cerâmica e papel. O Brasil é o sétimo maior produtor mundial de caulim com 1,7 Mt anuais. Halloysita é um argilomineral dioctaédrico do tipo 1:1 que se dife...

Palygorskite (Pal) is a low-cost clay mineral material and was investigated in this study as a novel material for adsorptive desulfurization of petroleum refining fractions from the Clara Camarão Potiguar Refinery (RPCC) in Brazil. This clay mineral was characterized by X-ray fluorescence, X-ray photoelectron spectroscopy, X-ray diffraction, Fourie...

Palygorskite is a clay mineral that has several industrial and environmental applications. Palygorskite main deposits in Brazil are located in the municipality of Guadalupe, Piauí. A comparative study was performed with five samples of palygorskite from different locations through ore dressing and chemical and mineralogical characterization, using...

Several papers describe the treatment of calcium carbonate (CaCO3) with stearic acid acting as a surface modifier, in order to avoid particle coalescence and, at the same time, enhancing filler hydrophobic properties. However, there is still a lack of data relating the efficiency of a traditional modifier used, stearic acid, in the synthesis of CaC...

RESUMO Estão sendo estudadas amostras de argilas provenientes dos vales fluviais de tributários dos rios Doce e Jequitinhonha (MG). A pesquisa teve como objetivo a caracterização mineralógica e tecnológica das argilas e, assim, suas possíveis utilizações na indústria, seja de cerâmica, de papel, entre outras, além de aprimorar o entendimento sobre...

Igneous intrusions in sedimentary basins are commonly related with mineralogical association changes in host-rock. At Sapopema region (Paraná State, southern Brazil), an extensive diabase sill (associated to Serra Geral Formation) was emplaced in pelitic-carbonate succession during post-Triassic. The sedimentary host-rock association includes mostl...

STRUCTURAL CHARACTERIZATION OF BENTONITE CLAYS FOR THE DEVELOPMENT OF POLYMERIC NANOCOMPOSITES ABSTRACT: Bentonite clays have been widely used in the development of polymer nanocomposites due to the possibility of exfoliation of clay particles up to their nanometric scale with the consequent high aspect ratio presented by these particles. The high...

RESUMO A palygorskita é um argilomineral que apresenta grande capacidade de adsorção de cátions metálicos devido às substituições isomórficas que podem ocorrer na sua rede cristalina. Nos canais livres desse mineral, onde ocorre a troca de cátions, também há a presença de água zeolítica, que pode ser retirada com aquecimento, aumentando a superfíci...

This research presents the mineralogical and chemical characterization and beneficiation study of two kaolin deposits from the Borborema Pegmatite Province, Brazil. Seven samples were collected and treated in two different beneficiation routes involving magnetic separation and chemical bleaching. The fractions obtained were studied by X-ray diffrac...

There are two principal types of nickel (Ni) deposits: sulfide and laterite ores. Interest in low‐grade Ni‐laterite ores has increased in recent years as high‐grade Ni‐sulfide deposits are being quickly depleted. However, processing of Ni laterites has proven technically difficult and costly, and the development of alternative low‐cost biotechnolog...

The Irati Formation documents a singular moment in the evolution of the Paraná Basin, when an effective restriction of water circulation between the syneclise and the Panthalassa Ocean finally established a favorable environment for the deposition of oil shales. The present study presents data from X-ray diffraction (XRD), scanning electron microsc...

In this work, the linear swelling of four samples of natural clays was evaluated, using poly(propylene glycol) bis(2‐aminopropyl ether) ~230 g mol⁻¹ (PEDA‐230) and ~400 g mol⁻¹ (PEDA‐400) as shale inhibitors for water‐based drilling fluids, in comparison to a commercial shale inhibitor. The swelling kinetics was described by a semiempirical equatio...

In this work, the occurrence of corundum, in the sapphire variety, occurring in the south of the state of Rio de Janeiro, Brazil, was studied in Visconde de Mauá, a village in the municipality of Resende. The corundum occurs in alluvial sedimentary deposits in tributaries that are part of the drainage basin of the Paraíba do Sul River. The objectiv...

The objective of this work is the production and characterization of glass-ceramic with recycled glass powder and 4% (w/w) of cerium dioxide. Eleven groups were defined with conformation pressure of 11.6 and 25.8 MPa, and cerium dioxide addition. The sintering temperatures of 650, 675, 700 and 750 °C were used. The raw material was formed into a mo...

Petroleum production deserves more space than it has now in instruction in Materials Science and Engineering and related disciplines. The tests proposed in this work involve the synthesis of polymeric magnetic nanocomposites-which have been widely studied for removal of oil from contaminated water-a common problem in the petroleum industry, especia...

The Itapecuru Formation (Lower to Middle Albian) is the largest lithostratigraphic unit outcropping in the Mesozoic section of the Parnaíba Basin, NE Brazil. This work presents detailed petrographic characterization of seventy samples collected in outcrops of the unit in the north of Maranhão state. The study revealed that formation consists mainly...

Caulim é uma rocha de granulometria fina, coloração branca e composta principalmente por caulinita e/ou seus polítipos. É matéria prima em diversos segmentos industriais, principalmente os decerâmicaepapel. Os depósitos de caulim são divididos como do tipo primário, quando derivados da alteração in situde rochas ricas em feldspato, e como secundári...

A dinâmica da deriva litorânea da região planície deltaica do rio Paraíba do Sul, nordeste do estado do Rio de Janeiro, tem sido tema de importantes discussões ao longo dos últimos anos. No início da década de 1980, alguns autores acreditavam que a maior parte do aporte sedimentar da região fosse proveniente de correntes induzidas por ondas de temp...

iPP/Talc composites were produced, with different methods of filler addition in iPP matrix. Two different grades of Talc were used for comparison. The tensile tests results showed that talc particles promoted an improvement in composite rigidity, indicating the reinforcing effect of the talc particles in the iPP matrix. However, PP/talc-based compo...

The Itapecuru Formation (Lower to Middle Albian) is the largest lithostratigraphic unit outcropping in the Mesozoic section of the Parnaíba Basin, NE Brazil. This work presents detailed petrographic characterization of seventy samples collected in outcrops of the unit in the north of Maranhão state. The study revealed that formation consists mainly...

São Sebastião is a recently discovered Archean gold deposit at the northwesternmost part of the Quadrilátero Ferrífero (QF), southern São Francisco craton, Brazil. The gold ore is strata-confined in two levels of banded iron formation (BIF) of the basal stratigraphic unit in the Pitangui greenstone belt (2.8 Ga). Pitangui is correlated to the widel...

RESUMO Áreas contaminadas por metais podem configurar sério risco à saúde pública e ao meio ambiente. Na década de 1980 foi instalado um pátio de estocagem provisória de resíduos industriais perigosos (CENTRES), no município de Queimados, Rio de Janeiro, o que causou um grande impacto ambiental ao solo da região. A legislação brasileira para o diag...

The Corrego do Oliveira body, located between Duas Barras and Sumidouro (RJ), is a mafic-ultramafic sill intruded in the Rio Negro Complex orthogneisses near to the contact with quartzites and calc-silicate rocks of the Andrelandia Metasedimentary Sequence. The presence of disseminated sulfides and the local geological setting suggests the possibil...