• Resources Recycling
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• v.11 no.5
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• pp.24-29
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• 2002

In this study, to improve the color of iron oxide from waste pickling acid at the cold rolling mill, the quality control technologies especially about color were investigated on the spray roaster and iron oxide powder. At the operation condition of the spray roaster, the charge amount of waste acid per hour, temperature, numbers of spray nozzle were investigated. At admixing process, titanium oxide, silica, goethite were tested. Color character of iron oxide can be improved by process control at spray roaster and by admixing process at a pigment factory Iron oxide from results of this study is enough to use as the colorant of concrete product.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2004.12a
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• pp.17-26
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• 2004

산화철의 국제동향에 대하여 각 지역 간의 수출입동향과 최근에 급속하게 성장하고 있는 중국의 산화철업계 동향에 대하여 소개하였다. 특히 세게 산화철 교역량은 산화철업계의 기술발전과 각 국이 처한 환경에 따라 변화하며, 산화철의 주요용도중 하나인 안료용도의 경우 건축경기에 큰 영향을 받는다. 중국의 산화철업계는 전반적으로 크게 성장한 반면 다국적 기업의 진출에 따른 기술력 향상과 반대급부로 경쟁력 약한 중국내 기업정리 등이 수반되었다. 산화철산업의 발전을 위하여는 타 소재와의 가격경쟁력도 중요하지만 새로운 응용분야의 개척이 필요하다 본 기술자료에서는 최근에 관심이 집중되는 산화철 나노분말에 대하여 신용도 및 특성에 대하여 소개하였다.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 1998.09a
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• pp.1-103
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• 1998

• Resources Recycling
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• v.13 no.6
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• pp.3-8
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• 2004

From the world wide globalization of iron oxide industry, the global trend in iron oxide is changed rapidly and the production of iron oxide is increasing in China, currently. Iron oxide have a broad range of applications from construction materials to medical area. Therefore, it is expected that nanoparticulate iron oxides have many applications, too. A series of interesting applications in entirely different fields are introduced.

• Conservation Science in Museum
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• v.2
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• pp.69-76
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• 2000

This study, a part of scientific analysis of the 23 Neolithic red earthenwares excavated from southeastern coast and islands. We analyzed earthenware through statistical method and hardness analysis of clay, following the analysis of clay composition, its firing temperature, pigment composition and its thickness. Clay composition was analyzed by using ICP-AES and XRF, and then Principal Component Analysis (one of multivariate methods) was used for classification. As a result, clay of the earthenware was classified into 3 groups(Bumbang, Youkjido and other sites). In addition, hardness analysis of pigment and clay based on the depth of earthenware surface showed that pigment layer containing lots of Fe₂O₃ had higher hardness than clay part, which can be interpreted that Fe₂O₃ contributes to raising hardness in case of high temperature firing. The fact that pigment hardness is higher than that of clay part implies that pigment was applied before firing.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.11a
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• pp.47-58
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• 2005

From the world wide globalization of iron oxide industy, the global trade in iron oxide is changed rapidly and the production of iron oxide is increasing in China, currently. Iron oxide have a broad range of applications from construction materials to medical area. Therefore, it is expected that nanoparticulate iron oxides have many applications, too. There is a series of interesting applications are introduced, but in entirely different fields as they are known from conventional iron oxide.

• Journal of the Mineralogical Society of Korea
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• v.22 no.2
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• pp.153-162
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• 2009

The main compositions of "Seokganju", a Korean traditional red mineral pigment, are iron oxides. To investigate its mineralogical and functional properties, we had got its ore from Juto cave in Ulreoung island, which was a famous field of it in Korean documents. The ore occurs as a paleosol between the olivine basalt and amphibole trachyte in discontinuously. It is reddish brown and yellowish brown and consists mainly of clay minerals with minor debris. Its reddish and yellowish brown color are due to the hematite and ferrihydrate, respectively. These iron oxides are precipitated as ferrihydrate from the ferrous water in the paleosol and partly changed to hematite. The color reproduced in timber by using seokganju pigment with traditional tools and methods is similar to that in heritage building. The moistureproofing and fire resistance of Ulreungdo seokganju is far better than that of artificial seokganju. Moreover, the combustion tests show that the artificial seokganju promote the ignition and combustion of the timber. Ulreungdo seokganju is regarded as a pigment with fungicidal efficacy because growth of two wood decay fungi (cov. and typ.) are inhibited in solid medium with it.

• Journal of Conservation Science
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• v.35 no.6
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• pp.573-587
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• 2019

In this study, reproducing specimens were made from mixing domestically produced magnetite, clay and non-plastic raw materials to reproduce the pigments used in the manufacture of traditional cheolhwa buncheong stoneware. In order to reveal the color fomation of glaze, 30 specimens with good color development were analyzed scientifically. Magnetite, which is the main raw material of the pigment, is a pigment capable of creating a dark black color in a reducing environment at 1,200℃. However, it reacts with the additionally added lime component and discolors to greenish yellow color in oxidizing environment at 1,230℃. Hematite is not significantly affected by the firing temperature and environment, but develops a dark black color when mixed with clay with iron content of more than 10%. The fluidity of the pigment is determined by R₂O₃/RO₂ value, which also affects the color development. In the microtexture observation, the color formation of the glaze layer and the iron oxide crystals identified some differences depending on the particle size of the pigment and the firing environment. Reproduced specimens made of magnetite are present in the form of aggregates of iron oxide in the interface between glaze layer and slip layer in the oxidizing environment at 1,200℃. However, in the reducing environment, aggregates of iron oxides do not exist in the reproduced specimens, and they are homogeneously distributed in the glaze layer and formed a dark black color. In contrast, hematite-based specimens form dendritic structures in the glaze layer in an oxidizing environment and develop black.

• Resources Recycling
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• v.5 no.2
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• pp.57-62
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• 1996

The regeneration of wastc piddlng acid from ironmaking industry produces Iron oxides as by products which are used for pigments and raw matcrial of ferrite. Thc impurilies level of iron axides for ferrile arc strictly regalated. Filtrat~on, adsorption medw technique, Fe leaching and ncutralizaiion wcre tried in order to remove silica impurities in the wasb pickling acid solution.

• Applied Chemistry for Engineering
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• v.10 no.1
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• pp.1-5
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• 1999

The dispersing performance of oligomer-type anionic surfactants ($C_mD-Na$), cooligomers of diethylester maleate and alkylvinylether of different alkyl chain lengths or polymerization degree were studied on the aqueous suspension of iron dxide or titanium dioxide particles which are hydrophilic pigments. The dispersion behavior of oligomer-type surfactants for these dispersoids, although anion charges on the surface of pigments particles showed different dispersing properties, was dependent upon the side alkyl chain length. Oligomer-type surfactants having more than $C_8$ side alkyl chain exhibited large dispersing action for relatively hydrophobic ${\alpha}-Fe_2O_3$ and Anatase $TiO_2$ in the concentration range of more than 0.1% oligomer-type surfactant solutions.