scholarly journals Characterization of Brazilian Northeastern plastic clays

Cerâmica ◽  
2019 ◽  
Vol 65 (376) ◽  
pp. 578-584
Author(s):  
A. Laursen ◽  
L. N. L. Santana ◽  
R. R. Menezes
Keyword(s):  
Raw Materials ◽  
Mineralogical Composition ◽  
Ceramic Technology ◽  
Northeastern Brazil ◽  
Green Strength ◽  
Mineralogical Characteristics ◽  
Ball Clay ◽  
Materials Used ◽  
Plastic Clays

Abstract Plastic clays are one of the main raw materials used in ceramic technology. However, there is a shortage of good quality plastic clays in the world for use in porcelain technology. The aim of this study was to characterize plastic clays from Northeastern Brazil. Chemical and mineralogical composition, particle size distribution, plasticity and green strength of the clays were determined. The analyzed clays were predominantly composed of kaolinite and quartz, and some contained smectite. The amount of iron oxide in the clays was higher than 1.0% and for some of them the values were higher than 3%; the liquid and plastic limits ranged from 22% to 48% and 10% to 32%, respectively. According to characterization data, three plastic clays had potential to be used as alternative ball clay, due to their plasticity and mineralogical characteristics.

Characterization of clays from the Foumban region (west Cameroon) and evaluation for refractory brick manufacture

Clay Minerals ◽  
2018 ◽  
Vol 53 (3) ◽  
pp. 447-457
Author(s):  
A. Pountouenchi ◽  
D. Njoya ◽  
A. Njoya ◽  
D. Rabibisao ◽  
J.R. Mache ◽  
...  
Keyword(s):  
Material Properties ◽  
Major Element ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Refractory Brick ◽  
Major Element Chemistry ◽  
End Products ◽  
Materials Used ◽  
Steel Mould

ABSTRACTThree clayey materials named MY3, KK and KG originating from the Foumban region (west Cameroon) were analysed to determine their granulometry, plasticity, major-element chemistry and mineralogy. Dilatometric and ceramic behaviour were also investigated. Clays were shaped by uniaxial pressing in a steel mould. Shaped samples were heated at 1300, 1400 and 1500°C. The end products were characterized in terms of their density, porosity and compressive strength. Raw materials differ in terms of their mineralogical composition, grain-size distribution, Al2O3 content and the nature and abundance of impurities inducing specific thermal behaviour during dilatometric analysis and sintering tests. The final material properties may be related to the main features of the raw materials used.

Analysis of the Incorporation of Scheelite Residue in Kaolinitic Clay of Boa Saúde-RN

2012 ◽  
Vol 727-728 ◽  
pp. 844-849 ◽  
Author(s):  
Tércio G. Machado ◽  
Uilame Umbelino Gomes ◽  
Flanelson M. Monteiro ◽  
Samara M. Valcacer ◽  
Gilson G. da Silva
Keyword(s):  
Raw Materials ◽  
Particle Size Analysis ◽  
Northeastern Brazil ◽  
Size Analysis ◽  
Bending Tests ◽  
Materials Used ◽  
Kaolinitic Clay ◽  
The City ◽  
Mineral Waste

The scheelite occurs mainly in northeastern Brazil, with highest abundance in the states of Rio Grande do Norte and Paraíba - Scheelite Seridó Province. Mining is considered an activity that provides a high environmental degradation due to the large amount of minerals and waste involved. Most mining companies have no technologies or processes that allow the recycling of mineral waste generated. The aim of this study is to evaluate the influence of different percentages of reject on the mechanical properties of scheelite and aesthetic (staining of the final product after firing) of the clay of the city of Boa Saúde - RN. The raw materials used were characterized by XRD, XRF and particle size analysis. Assay was performed by water absorption, linear retraction and bending tests on three points for the characterization of the final product. The raw materials used were from the city of Currais Novos-RN.

scholarly journals Thermal characterization of archaeological pot sherds recently excavated in Nedunkur, Tamilnadu, India

Cerâmica ◽  
2012 ◽  
Vol 58 (347) ◽  
pp. 338-341 ◽  
Author(s):  
S. Meyvel ◽  
P. Sathya ◽  
G. Velraj
Keyword(s):  
Raw Materials ◽  
Thermal Characterization ◽  
Inert Atmosphere ◽  
Firing Process ◽  
Linear Temperature ◽  
Thermal Reactions ◽  
Mineralogical Characteristics ◽  
Temperature Ramp ◽  
Materials Used

The archaeological pottery sherds excavated recently in Nedunkur, Tamilnadu, were analysed using Thermogravimetric (TG) and Differential Thermal analysis (DTA) with an objective of identifying the mineralogical characteristics of the raw materials used for their production. Besides, the thermal reactions associated over the linear temperature ramp from room temperature to 1200 °C in an inert atmosphere were also realized by TG-DTA. The characterization studies were able to indicate the conditions of firing process adopted and firing temperature attained by the artisans at the time of manufacture.

Characterization of Ceramic Tiles Added with EAF Slag Waste

2014 ◽  
Vol 1024 ◽  
pp. 211-214 ◽  
Author(s):  
Pao Ter Teo ◽  
Abu Seman Anasyida ◽  
Mohd Sharif Nurulakmal
Keyword(s):  
Flexural Strength ◽  
Raw Materials ◽  
Solid Wastes ◽  
Arc Furnace ◽  
Ceramic Tiles ◽  
Total Percentage ◽  
Eaf Slag ◽  
Ball Clay ◽  
Slag Waste

The increasing production of steel leads to an increment of solid wastes generated especially Electric Arc Furnace (EAF) slag. This becomes a serious concern as the slag has to be disposed in a proper manner in order to avoid dumping in landfills which will eventually occupy available land and may cause permanent damage to the flora and fauna. In this project, an attempt was made to utilize the EAF slag as one of the raw materials in ceramic tiles. Results obtained showed that as percentage of EAF slag added was increased up to 60%, percentage of apparent porosity and water absorption were found to increase, accompanied by reduction in flexural strength due to more severe porosity was observed in the tiles. On the other hand, reducing the percentage of EAF slag up to 40% while increasing percentage of ball clay added led to formation of higher total percentage of anortite and wollastonite minerals. This would contribute to higher flexural strength of tiles. In addition, by adding silica and feldspar, the flexural strength of tile produced was further improved due to optimization of densification process. Highest flexural strength of EAF slag based tiles was attained at composition of 40% EAF slag 30% ball clay 10% feldspar 20% silica. It was observed that properties of ceramic tiles added with EAF slag, especially flexural strength are comparable with commercial ceramic tiles. Therefore, the EAF slag ceramic tiles have great potential to be made into high flexural strength or wear resistant floor tiles.

Mineralogical and physicochemical characterization of selected Portuguese Mesozoic-Cenozoic muddy/clayey raw materials to be potentially used as healing clays

Clay Minerals ◽  
2010 ◽  
Vol 45 (2) ◽  
pp. 229-240 ◽  
Author(s):  
M. Rebelo ◽  
F. Rocha ◽  
E. Ferreira Da Silva
Keyword(s):  
Physicochemical Properties ◽  
Mineral Water ◽  
Raw Materials ◽  
Physicochemical Characterization ◽  
Mineralogical Composition ◽  
Exchange Capacity ◽  
Water Mixture ◽  
X Ray Diffraction ◽  
Geological Formations

AbstractThe use of pelitic geological materials for the treatment of muscle-bone-skin pathologies, by application of a cataplasm made of clay and mineral water mixture, is currently receiving attention and interest from the general public and scientific community. In Portugal there are several natural occurrences of clays/muds which are used for pelotherapy and/or geotherapy. These are carried out either indoors (thalassotherapy and thermal centres) or outdoors, in natural sites generally located near the seaside. The aim of this study is to assess the mineralogical and physicochemical properties of Portuguese raw materials for therapeutic purposes. These materials were collected from different Portuguese Mesozoic-Cenozoic geological formations located in the neighbourhood of thermal centres or at beaches known from their empirical applications. X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS) were used to assess the mineralogical composition of these clays. Physicochemical properties, such as specific surface area, cation exchange capacity, plasticity/abrasiveness indices and heat diffusiveness were also determined. Having distinct geological ages and genesis, the materials examined are mainly illitic. Less abundant kaolinite and smectite are also present. With respect to their physicochemical properties, all samples have good thermal properties which make them potentially suitable for therapeutic or aesthetic purposes.

scholarly journals Powder diffraction of yellow and red natural earths from Lessini Mountains in NE Italy

2015 ◽  
Vol 30 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Giovanni Cavallo ◽  
Maria Pia Riccardi ◽  
Roberto Zorzin
Keyword(s):  
Powder Diffraction ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Degree Of Crystallinity ◽  
Ne Italy ◽  
Mineral Phases ◽  
Mineral Assemblages ◽  
Parent Rocks ◽  
Materials Used ◽  
The Degree Of Crystallinity

A first attempt to differentiate goethite- and hematite-based natural materials, used for several purposes during the Late Palaeolithic in the Lessini Mountains (Italy), is here proposed. All raw materials were collected from known geological sites within a distance of about 20 km from archaeological excavations (Tagliente and Fumane caves) where ochre fragments were found. X-ray powder diffraction allowed the mineralogical composition of samples collected from carbonate and volcanic geological host and parent rocks to be inferred; in addition, a preliminary distinction based on the different mineral assemblages, on the presence of distinctive mineral phases and on the degree of crystallinity of some compounds such as hematite, became possible. The acquired data thus represent a sort of preliminary inventory for provenance studies on archaeological samples originating in the same region, for which ancillary micro-analytical and geochemical techniques are planned.

Correlation between Microstructure and Magnetic Properties on MnZn Ferrite with Bi2O3 Increasing Addition

2014 ◽  
Vol 216 ◽  
pp. 23-28
Author(s):  
Mihai Branzei ◽  
Ionut Cristea ◽  
Ion Ciuca ◽  
Adrian Bibiș ◽  
Marcel Feder
Keyword(s):  
Ball Mill ◽  
Raw Materials ◽  
Steel Ball ◽  
Ceramic Technology ◽  
Molar Ratio ◽  
Quantitative Characterization ◽  
Mnzn Ferrite ◽  
Sintered Powder ◽  
Microstructure And Magnetic Properties

The aim of this paper is quantitative characterization of a MnZn ferrite with Bi2O3increasing addition using the Image-Pro Plus software from Media Cybernetics. The sample matrix is a ferrite with the following chemical composition: Mn0.54Zn0.37Fe2.06O4. We applied the conventional ceramic technology in order to obtain the samples. Thus, the raw materials, i.e. αFe2O3, Mn3O4, and ZnO, in a molar ratio 53:28:19 were mixed in suitable proportions in a steel ball-mill using demineralized water. The mixture was burn off at 800 °C for 1 hour, in air. The pre-sintered powder was milled in steel ball-mill with increasing addition of Bi2O3(0.00, 0.01, 0.03, 0.05, 0.07, 0.10, 0.30, 0.50 wt %). For quick references, the sample without bismuth ions was denoted and the samples with increasing concentrations were numbered from 1, 7.

scholarly journals Microscopic Analysis of Pottery Fragments from the Corded Ware Culture at Sites 11, 15 and 20 in Święte, Jarosław District

2018 ◽  
Vol 23 (1) ◽  
pp. 163-177 ◽  
Author(s):  
Anna Rauba-Bukowska
Keyword(s):  
Raw Materials ◽  
Microscopic Analysis ◽  
Mineralogical Composition ◽  
Crystalline Material ◽  
Petrographic Analysis ◽  
Type B ◽  
Preparation Methods ◽  
Heavy Clay ◽  
Materials Used ◽  
Natural Component

Abstract For microscopic examination, 22 pottery fragments from sites 11, 15 and 20 in Święte, Jarosław District were selected. The pottery types included beakers (N=19) and amphorae (N=3). The goal of the petrographic analysis was to identify mineralogical composition of ceramic fabric, sources of raw materials, and intentional additives to the clay. The analysis yielded data that helped determine ceramic fabrics types and preparation methods, as well as pottery firing conditions and approximate firing temperature. In all samples analysed, ceramic fabrics were prepared in a similar way, using heavy clay poor in muscovite, with grog deliberately added. Crystalline material present in some of the samples is most likely a natural component of raw materials used in the production process. No sand is added to the clay. No other method for preparing pastes was identified for the amphorae type. Previous observations on amphorae firing are confirmed: amphorae are fired in oxidizing conditions. The ceramic fabrics of two vessels have a deliberate admixture of bones in addition to grog and argillaceous rock intraclasts. Vessels decorated with cord impressions and vessels with herringbone or other incised patterns are more often made from paste type A (inclusion and grog) and paste type B (grog), respectively.

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