Reducing the coloring effects of iron oxides in porcelain bodies

Павлов, В. Ф.; Meshcheryakova, I. V.

doi:10.1007/bf00706318

Cited by 7 publications

(3 citation statements)

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“…). This might make them look lighter in colour than samples from Piaoshan and Beijiashan, because the iron oxide level in raw material could influence the whiteness of porcelain when the firing atmosphere creates poor reducing conditions (Pavlov and Meshcheryakova ). A decrease in the iron content is indeed a trend in raw material change in the early developmental stage of ceramic producing.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Early High‐Fired Ceramic Shards from Dongtiaoxi, Zhejiang (China)

et al. 2017

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There is a generally accepted view that there is an obvious distinction between proto-porcelain and stamped stoneware. However, some early shards unearthed from the Dongtiaoxi region (northern Zhejiang) inspire people to rediscuss the relationship between them, because it is difficult to identify them as proto-porcelain or stamped stoneware. In this work, we have collected samples from three of the earliest kiln sites (Piaoshan, Beijiashan and Nanshan) in the Dongtiaoxi region. We have analysed the chemical composition, firing temperature and phase composition of the samples. Comparing samples from the three kiln sites, we find that, from Piaoshan and Beijiashan to Nanshan, there has been progression in the manufacturing technology. The Shang proto-porcelain and the stamped stoneware from Nanshan have similar raw materials, firing temperatures and body phase compositions-and they have obviously different decorative appearances, such as glazing or stamping. For ceramics from Piaoshan and Beijiashan, there is no clear distinction between glazed and unglazed samples. We believe that in the Dongtiaoxi region, the difference in the decoration between proto-porcelain and stoneware became obvious up to the time of the Nanshan production but that, subsequently, two different paths for the development of high-fired ceramics began to diverge.

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Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Early High‐Fired Ceramic Shards from Dongtiaoxi, Zhejiang (China)

et al. 2017

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“…Amounts as small as 0.4% iron(III) may be sufficient to affect the quality (Ambikadevi & Lalithambika, 2000). Elimination of iron(III) can increase the value of the kaolin so it can be used to make porcelain items and ceramics where there are strict demands for whiteness (Pavlov & Meshcheryakova, 1983).…”

Section: Introductionmentioning

confidence: 99%

Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological (Bacillus Strain) Leaching

Sánchez‐Palencia

Bolonio²,

Ortega³

et al. 2022

Clays and clay miner.

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Kaolin waste dumps contain a huge volume of material that cannot be commercialized due to the presence of variable amounts of iron minerals, which impart a yellowish color to the kaolin. Elimination of iron from kaolin using either a chemical or a biological method was the aim of this study. The chemical leaching of iron from kaolin was carried out using response surface methodology to optimize the reaction conditions. Time was found to be the most influential variable, although oxalic acid must be present to leach 32% of the iron. Biological leaching was also assayed for 14 days using a Bacillus strain. The results of bacterial leaching of iron from kaolin showed <1% iron elimination.

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“…Contudo, a presença de óxidos de ferro pode ser um entrave para algumas aplicações, pois podem produzir coloração indesejada para as peças se o intuito for decorativo. O mesmo acontece quando se substitui o caulim por outras fontes de argila mais ricas em ferro e titânio, na tentativa de se criar uma massa cerâmica da classe porcelana, uma vez que esses óxidos alteram sua coloração para tons mais escuros [12]. As principais diferenças químicas entre a rocha potássica e o fonolito residem nos teores dos óxidos de sódio e potássio, sendo o fonolito mais rico em sódio e a rocha potássica rica em potássio.…”

Section: Introductionunclassified

Matérias-primas do Planalto de Poços de Caldas: Alternativas ao Caulim e ao Feldspato na formulação de Porcelanas e materiais de Revestimento

Kotani¹,

Nakachima²,

Ferreira³

et al. 2019

Cerâm. ind.

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Resumo Materiais a base de caulim, feldspato e quartzo encontram variadas aplicações na indústria cerâmica, principalmente em formulações de porcelanas e materiais ligados à construção civil, mercados em que o Brasil é destaque internacional. As grandes reservas de rocha potássica e fonolito na região de Poços de Caldas-MG, apresentam-se como potenciais substitutos ao tradicional feldspato devido ao alto caráter fundente. Em adição, argilas desta mesma região também são alternativas frente ao consumo de caulim, substituindo-o parcialmente ou totalmente em formulações cerâmicas. Este estudo apresenta a validade destas alternativas, apresentando formulações cerâmicas e matérias-primas com potencialidades tecnológicas.

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Reducing the coloring effects of iron oxides in porcelain bodies

Cited by 7 publications

References 1 publication

A Comparative Study of the Early High‐Fired Ceramic Shards from Dongtiaoxi, Zhejiang (China)

A Comparative Study of the Early High‐Fired Ceramic Shards from Dongtiaoxi, Zhejiang (China)

Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological (Bacillus Strain) Leaching

Matérias-primas do Planalto de Poços de Caldas: Alternativas ao Caulim e ao Feldspato na formulação de Porcelanas e materiais de Revestimento

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