Technological characterization of kaolin: Study of the case of the Borborema–Seridó region (Brazil)

Silva, Fernanda Arruda Nogueira Gomes da; Luz, Adão Benvindo da; Sampaio, João Alves; Bertolino, Luíz Carlos; Scorzelli, R. B.; Duttine, Mathieu; Silva, Flávio Teixeira da

doi:10.1016/j.clay.2009.01.015

Cited by 21 publications

(17 citation statements)

References 6 publications

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“…However, The F3 had the highest gloss value. The increase of the Kaolin [8] in the coating formulations led to an augmentation in the yellowness value. However, it resulted in the highest brightness values.…”

Section: Resultsmentioning

confidence: 96%

Effects of Calendering on Print Densities of Coated Paperboards

Sönmez¹

2017

Marmara Fen Bilimleri Dergisi

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In this study, the effect of calendering on print quality was determined. For this purpose, five different pigment-coating formulations were prepared. They were coated on the surface of the base paperboard, previously coated with starch. Half of the coated base paperboards were calendered. Then, the Ugra82 (Ugra82 Plate Control Wedge) was printed on calendered and uncalendered-coated base paperboard surface by offset printing using black inks. All solid density measurements on the printed wedge were performed using a calibrated Gretag Macbeth Spectrolino Spectrophotometer. Double coating of the base paperboard surface is important for printability. As a result of measurement, it was found that calendering increased the surface smoothness. The surface smoothness of coated paperboard increased as long as ink absorption reduced. Hence, density value augmented after calendering. Generally, the raise of the kaolin ratio in the coating formulations affected positively printability.

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Section: Resultsmentioning

confidence: 96%

Effects of Calendering on Print Densities of Coated Paperboards

Sönmez¹

2017

Marmara Fen Bilimleri Dergisi

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“…The kaolin of the Borborema-Seridó Province is composed of kaolinite, muscovite, quartz and feldspar. Through proper beneficiation it is possible improve the properties of the material [5].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical characterization and beneficiation study of kaolin from Equador (RN) and Junco do Seridó (PB) to increase the brightness index

2017

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Kaolin is a rock composed mainly of kaolinite. It is used in many industrial segments, such as paper and ceramics. However, for these uses it is necessary to submit the ore to appropriate beneficiation, which generally involves magnetic separation and chemical bleaching, aiming to remove iron oxide and hydroxide, raising brightness index. This work reports the mineralogical characterization and analysis of the beneficiation of three samples of kaolin, two from Equador (Rio Grande do Norte -RN) and the third from Junco do Seridó (Paraíba -PB). The samples were submitted to granulometric classification in sieve of 44 mm, magnetic separation in a magnetic induction of 14000 gauss, and chemical bleaching with sodium dithionite during 240 min. The processes were divided into two beneficiation routes. X-ray diffraction, chemical analysis by X-ray fluorescence and scanning electron microscopy were used for mineralogical characterization of the ore and measurement of the brightness index, while electron paramagnetic resonance was applied to study the variation of iron oxides and hydroxides during beneficiation. The results indicate that just 30 min of chemical bleaching without magnetic separation was sufficient to increase the brightness index from 78.2 to 90.2% and from 91.3 to 95.7% in the two samples from Equador (RN) and from 86.9 to 90.4% in the sample from Junco do Seridó (PB). The magnetic separation, although causing a small increase in the brightness index, was inefficient for removal of iron oxides and hydroxides. The results indicated no need for using magnetic separation in plants for beneficiation of kaolin from these two locations, providing the reduction of production costs allowing better exploitation of the ore.

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“…Martins (1990) fez um estudo comparativo entre a fabricação do concreto utilizando agregados graúdos convencionais (brita granítica) e outros concretos fabricados com graúdos não convencionais tais como seixo rolado, concreções lateríticas e brita calcária, obtendo como resultado depois dos testes realizados e comparados com o resultado do concreto fabricado com brita granítica, em consonância com as normas regulamentadoras de fabricação de concreto, que o concreto produzido com o seixo rolado (quartzo) pode substituir plenamente a brita granítica enquanto que o concreto produzido com calcário e as concreções lateríticas podem ser utilizado em obras de menor responsabilidade. Silva et al (2009) apresentou um estudo de caso com o objetivo de caracterizar o caulim da região Borborema--Seridó, levando em consideração a sua utilização na indústria de tinta, cerâmica e principalmente na indústria de papel. Para tanto, foram realizados vários testes físicos e físico químicos, dentre eles a separação magnética por via úmida de alta intensidade para a retirada dos minerais de ferro (hematita, goethita e magnetita), o branqueamento químico junto com o controle de Ph e Eh em meio oxidante e redutores na fração não magnética do caulim para a retirada do ferro e outros contaminantes como micas, quartzos e materiais orgânicos.…”

Section: Introductionunclassified

Estudo Do Resíduo De Caulim Pegmatítico Usado Como Ingrediente Na Formulação De Cimento Portland

Leandro¹,

Viera²,

Gonçalves³

et al. 2017

HOLOS

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RESUMOO cimento Portland é usado, principalmente, na indústria da construção civil que é a grande responsável pelo consumo dos recursos naturais não renováveis. A utilização de resíduos, provenientes do processamento mineral, na fabricação de cimento, além de diminuir passivos ambientais contribui com a sustentabilidade, produzindo cimentos ecoeficientes. O resíduo de caulim, proveniente das empresas situadas na Província Pegmatítica da Borborema, é uma argila constituída de caulinita (alumino silicato) e outros componentes minerais, que assemelha--se ao aditivo pozolânico utilizado na fabricação do cimento A adição de pozolana propicia ao cimento, dentre outras propriedades, maior resistência a meios agressivos como esgotos, água do mar, solos sulfurosos e agregados reativos. Os estudos com o resíduo de caulim foram realizados em escala de laboratório, através de ensaios de moagem, fluorescência de raios--X, resistência a compressão, dentre outros. Para os estudos utilizamos 30% do resíduo de caulim e 70% de uma amostra de cimento base (CP V--ARI) e posteriormente, foram comparados os resultados químicos e a resistência mecânica com períodos de cura de 1, 3, 7 e 28 dias. Os resultados mostraram que o resíduo de caulim pode, a princípio, substituir parcialmente o material pozolânico, utilizado como argila pozolânica na formulação do cimento.PALAVRAS--CHAVE: aditivo pozolânico, cimento, resíduo de caulim. STUDY OF THE PEGMATÍTICO KAOLIN RESIDUE USED AS AN INGREDIENT IN PORTLAND CEMENT FORMULATION ABSTRACTPortland cement is used mainly in the construction industry which is largely responsible for the consumption of non--renewable natural resources. The use of residues from mineral processing in the manufacture of cement, besides reducing environmental liabilities contributes to sustainability, producing eco--efficient cements. The residue of kaolin, coming from the companies located in the Pegmatitic Province of Borborema, is a clay composed of kaolinite (aluminosilicate) and other mineral components, which resembles the pozzolanic additive used in the manufacture of cement. The addition of pozzolan gives cement, among other properties, greater resistance to aggressive media such as sewage, sea water, sulfur soils and reactive aggregates. Studies with the kaolin residue were carried out on a laboratory scale, using grinding tests, X--ray fluorescence, compressive strength, among others. For the studies, 30% of the kaolin residue and 70% of a sample of base cement (CP V--ARI) were used, and the chemical results and mechanical resistance were compared with cures of 1, 3, 7 and 28 days. The results showed that the kaolin residue can at first partially replace the pozzolanic material used as pozzolan clay in the cement formulation.

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Technological characterization of kaolin: Study of the case of the Borborema–Seridó region (Brazil)

Cited by 21 publications

References 6 publications

Effects of Calendering on Print Densities of Coated Paperboards

Effects of Calendering on Print Densities of Coated Paperboards

Mineralogical characterization and beneficiation study of kaolin from Equador (RN) and Junco do Seridó (PB) to increase the brightness index

Estudo Do Resíduo De Caulim Pegmatítico Usado Como Ingrediente Na Formulação De Cimento Portland

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