scholarly journals Estudo de novas ocorrências de argilas plásticas (ball clays) do nordeste do Brasil para uso em cerâmicas refratárias

Cerâmica ◽  
2016 ◽  
Vol 62 (364) ◽  
pp. 338-344 ◽  
Author(s):  
J. M. Cartaxo ◽  
P. de M. Bastos ◽  
L. N. L. Santana ◽  
R. R. Menezes ◽  
G. A. Neves ◽  
...  
Keyword(s):  
Ball Clay ◽  
Ball Clays

Resumo A região nordeste do Brasil possui grandes depósitos de argilas plásticas do tipo ball clay situados geralmente na Formação Barreiras e são usados em cerâmica branca e materiais refratários. Essas argilas são constituídas por caulinitas secundárias e matéria orgânica, sendo muito plásticas e quando submetidas a elevadas temperaturas queimam com cores brancas e ocorrem transformações de fases, principalmente formação de cristais de mulita e cristobalita. Este trabalho tem como objetivo estudar novos jazimentos de argilas plásticas visando utilizá-los na produção de materiais refratários. As argilas foram caracterizadas por difração a laser, difração de raios X (DRX), fluorescência de raios X, refratariedade, análise térmica e microscopia eletrônica de varredura (MEV). Os corpos de prova foram prensados e sinterizados a 1000, 1150, 1250, 1280 e 1400 °C. A caracterização após queima foi realizada por DRX e MEV. Em seguida foram determinadas as propriedades físico-mecânicas: absorção, porosidade e tensão de ruptura à flexão. Os resultados evidenciaram que as argilas apresentaram a formação de cristais de mulita com propriedades físicas, químicas e mineralógicas adequadas para uso em cerâmica refratária.

scholarly journals Caracterização de argilas plásticas do tipo "ball clay" do litoral paraibano

Cerâmica ◽  
2003 ◽  
Vol 49 (311) ◽  
pp. 120-127 ◽  
Author(s):  
R. R. Menezes ◽  
H. S. Ferreira ◽  
G. de A. Neves ◽  
H. C. Ferreira
Keyword(s):  
Ball Clay ◽  
Ball Clays

Os depósitos de argilas plásticas para cerâmica branca ("ball clays") de alta qualidade não são comuns, estando localizados basicamente nos Estados Unidos e no Reino Unido. As "ball clays" são utilizadas em uma série de indústrias que vão desde a indústria cerâmica à de cosméticos. Assim, este trabalho tem por objetivo analisar argilas do tipo "ball clay" extraídas do litoral paraibano, realizando sua caracterização para fins cerâmicos. Sua caracterização foi realizada por meio da determinação da massa específica real, CTC, área superficial (BET), distribuição granulométrica, composição química, ATD/ATG, DRX e MET. Após caracterização, foram conduzidos ensaios tecnológicos para fins cerâmicos com as amostras. Com base nos resultados pode-se concluir que as amostras são argilas basicamente cauliníticas com queima branca em temperaturas de 1250 ºC e 1450 ºC. Além disso, apresentaram propriedades físico-mecânicas dentro das faixas indicadas na literatura para "ball clays" utilizadas em tecnologia cerâmica.

Effects of Bituminous Coal Ash Addition in Pottery Products

2019 ◽  
Vol 798 ◽  
pp. 242-247 ◽  
Author(s):  
Yannawut Wonghom ◽  
Siripan Nilpairach ◽  
Charusporn Mongkolkachit ◽  
Thanataon Pornphatdetaudom ◽  
Thanakorn Wasanapiarnpong
Keyword(s):  
Fly Ash ◽  
Bituminous Coal ◽  
Bending Strength ◽  
Color Space ◽  
Bottom Ash ◽  
Coal Ash ◽  
Test Pieces ◽  
Coal Power ◽  
Ball Clay ◽  
Ball Clays

Bituminous coal ash, fly ash (FA) and bottom ash (BA), from coal power plant were studied in this research for utilizations in ceramic and pottery industries. Both fly ash and bottom ash mixed with four different ball clays from two kinds of ceramic pottery products such as flowerpot and construction brick, Ratchaburi, Chantaburi, Angthong and Chonburi ball clay. The mixtures were varying ratio between ashes and clays depend on clay sources. After mixing, the bodies were formed to test pieces and were then fired at 800-1200 °C. The results indicated that, added fly ash 0-40 wt% significantly decreased water absorption and increased bending strength when fired at 1150 °C or above. For color effect, CIE L*a*b* color space, both fly ash and bottom ash revealed the samples less lightness, more red and yellow appearance. These results are obvious when fired at 1150oC or above. Following the results, fly ash is possible to be used in ceramic pottery industries replaced with other addition such as sand and pottery stone.

scholarly journals Micro- and Nanotexture and Genesis of Ball Clays in the Lower Cretaceous (SE Iberian Range, NE Spain)

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1339
Author(s):  
Blanca Bauluz ◽  
María José Mayayo ◽  
Elisa Laita ◽  
Alfonso Yuste
Keyword(s):  
Nanometer Scale ◽  
Iberian Range ◽  
Clay Deposits ◽  
Different Types ◽  
The Matrix ◽  
Ball Clay ◽  
Ball Clays ◽  
Mixed Layers ◽  
Ne Iberian Peninsula

Ball clay deposits in the SE of the Iberian Range (NE Iberian Peninsula) consist of Albian clays and siltstones with greyish and blackish colors, interbedded with subbituminous coals. The ball clays are nowadays mined for the manufacture of white color ceramics. The mineralogy of these deposits consists mainly of kaolinite, illitic phases, and quartz. The euhedral to sub-euhedral morphology of the kaolinites suggests their in-situ origin. The anhedral morphology of the illites and the presence of frayed illites suggest a detrital origin. At the micro-scale, authigenic kaolinite booklets are observed filling pores and forming mica/kaolinite intergrowths, in which the kaolinite grows between the cleavage sheets of pre-existing detrital mica. At nanometer scale, illite/smectite (IS) phases are detected forming interlayers with mica and kaolinite, and evidence of the replacement of mica by kaolinite is observed. The matrix consists of defective illite and kaolinite, and random mixed layers of kaolinite-I/S (Kln-IS), illite-I/S (Ilt-IS), and I/S-smectite (IS-S). The textures of illite and the presence of different types of mixed layers suggest that the expandable phases and kaolinite are products of mica alteration. The effectivity of the alteration was probably a consequence of the low pH that occurred in the environment due to the presence of abundant organic- and acidic- rich fluids.

scholarly journals The constitution, evaluation and ceramic properties of ball clays

Cerâmica ◽  
1998 ◽  
Vol 44 (287-288) ◽  
pp. 88-117 ◽  
Author(s):  
Ian Richard Wilson
Keyword(s):  
United States ◽  
Czech Republic ◽  
The United States ◽  
Fine Grained ◽  
Clay Deposits ◽  
The World ◽  
Ball Clay ◽  
Ball Clays ◽  
White Colour

Ball clay is a fine-grained highly plastic, mainly kaolinitic, sedimentary clay, the higher grades of which fire to a white or near white colour. The paper will review the origin of the term "Ball Clay" and the location and origins of several deposits with particular emphasis on the mineralogical, physical and rheological properties which make the clays so important in ceramics bodies. Particular attention will be paid to the well known bay clay deposits of Devon and Dorset in southwest England, which are mined by ECC International Europe and Watts Blake Bearne & Company PLC, and brief descriptions from elsewhere in the world of ball clays from the United States, Germany, Czech Republic, Thailand, Indonesia, Argentina and China. The evaluation of deposits will be covered along with a description of the main types of ball clay for ceramics with details of the mining, processing and blending techniques which are necessary to ensure long term consistency of products. A brief description in given of the ceramic properties of some Brazilian ball clays. The location of some ball clay deposits is shown in Fig. 1.

A Tertiary thrust fault on the southern margin of the Bovey Basin

1971 ◽  
Vol 108 (1) ◽  
pp. 61-67 ◽  
Author(s):  
C. M. Bristow ◽  
D. E. Hughes
Keyword(s):  
Thrust Fault ◽  
Open Pit ◽  
Southern Margin ◽  
Thrust Plane ◽  
Borehole Drilling ◽  
Ball Clay ◽  
The Hill ◽  
Rotational Shear

SummaryGeological investigations and borehole drilling on the southern margin of the Bovey basin around Mainbow ball clay mine and Ringslade open pit have shown that Devonian slate up to 30 m thick is superimposed on Tertiary sediments. A drag fold beneath the slate indicates that the slate has moved eastwards over the Tertiary material. As the slate is relatively intact and not disaggregated, hillcreep cannot be responsible for the superimposition. A large landslip involving a rotational shear cannot be responsible, as the movement plane dips into the hill over too large an area. The southern margin of the Bovey basin is therefore interpreted as a thrust fault of Tertiary age, with thrust plane dipping 10° to 30° S. It is suggested that this is a rejuvenation of the Variscan thrust recognized in the Bickington area and further west in the Holne area and that the movement on the Tertiary thrust is related to the dextral wrench movement on the Sticklepath fault.

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.

Potential of Clay Deposits in Kelantan for Ceramic Production: A Literature Analysis

2014 ◽  
Vol 980 ◽  
pp. 74-78
Author(s):  
Olalere Folasayo Enoch ◽  
Ab. Aziz Shuaib ◽  
Khairul Azhar bin Mat Daud
Keyword(s):  
International Market ◽  
Shrinkage Porosity ◽  
Ceramic Production ◽  
Literature Analysis ◽  
Tile Production ◽  
Green Strength ◽  
Clay Deposits ◽  
Ball Clay ◽  
Clay Pipe ◽  
Potential Use

Kelantan state, regarded as the cradle of Malay culture is not only known for her unique cultural heritage, but also a land blessed with both metallic and non-metallic minerals. These include enormous clay deposits discovered in six (6) districts with estimated total reserve of 29.4 million tonnes of ball clay and 51.5 million tonnes of mottled clay. Hence, this paper investigates the physiochemical and mineralogical properties of the clay deposits. This was achieved by reviewing existing literatures and reports at the Mineral and Geoscience Department, Malaysia. The properties investigated were green and fired clay colour, plasticity, green strength, dry and fired shrinkage, porosity, chemical and mineral composition. The properties of the clay revealed that they have geographical IP potential; particularly, the predominantly off-white fired colour of the ball clay at temperature range of 900-11000C can secure an identity for Kelantan ceramics in the local, national or international market. Based on these properties, the ball clay is applicable for table ware, earthenware and local tile production while the mottled clay has a potential use for vitrified clay pipe, local tile and brick production.

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