• Title/Summary/Keyword: 백토(白土)

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Effect of Filter Aid Treatment on the Quality Characteristics of Salt-Fermented Anchovy Sauce (멸치액젓의 품질특성에 미치는 여과조제 처리의 효과)

  • JO Jin-Ho;DO Jeong-Ryong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.6
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    • pp.770-773
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    • 1999
  • To obtain the basic data for the improvement of flayer and color in salt-fermented anchovy (Engraulis japonicus) sauce and for the inhibition of non-soluble precipitates formation during storage, experiments were carried out on the changes of chemical properties by treatment with 1, 3, 5 and $7\%$ (w/v) of active carbon and filter aids such as active clay, $Al_2O_3$ diatomaceous earth, and celite. Deceleration rate were $32\~33\%$ in case of $5\%$ (w/v) active carbon or $5\%$ (w/v) active clay treatments, but deodoration effect was not expected in all treatments. The inhibition rate of non-soluble precipitates formation in me of $5\%$ (w/v) active clay, diatomaceous earth and $Al_2O_3$ treatments. was shown as $82\%,\;73\%$, and $70\%$, respectively.

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Some Mineralogical and Physico-Chemical Properties of Fuller's Earths from Tertiary Sediments in South Korea (삼기층중(三紀層中)에서 산출(産出)되는 산성백토(酸性白土)에 관(關)한 광물학적(鑛物學的) 조성(組成) 및 물리화학적(物理化學的) 성질(性質)에 관(關)하여)

  • Moon, Hee Soo;Morgan, D.J.
    • Economic and Environmental Geology
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    • v.16 no.3
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    • pp.149-161
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    • 1983
  • Fuller's earth deposits from Miocene sedimentary sequences in Gyeong Sang-do contain up to 95% Ca-montmorillonite accompanied by cristobalite, clinoptilolite, mordenite, quartz, feldspar and X-ray amorphous material. Differential thermal analysis, infrared and electron microscopic data are given for the montmorillonite component. The ease with which the exchangeable calcium of the montmorillonite could be replaced by sodium (to give a product with properties similar to that of a bentonite) was monitored by the Atterberg liquid limit test. Some samples tested as possible binders for foundry moulding sands gave results that compared favourably with material currently being used for this application. Many of the samples also met the OCMA specifications for clays used in drilling muds.

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Evaluation of Indoor Air Improvement of Matrix Using Activated clay as Adsorption Material (활성백토를 흡착재로 활용한 경화체의 실내 공기 개선 평가)

  • Jeong, Hyun-Su;Kim, Yeon-Ho;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.189-190
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    • 2020
  • The importance of indoor air quality management has recently been highlighted due to environmental problems such as indoor air pollution. Among indoor air pollutants, carbon dioxide occurs in cooking, heating, burning, and causes forgetfulness, dementia and amnesia. Radon, which occurs in building materials, soil and ground, is a type 1 carcinogen that causes lung cancer in the body through breathing. These substances can be released from the room through ventilation, but there is a limit to reducing the amount of indoor activity due to reduced ventilation conditions due to increased indoor activity time. However, these substances can be removed from the gas by adsorption. The purpose of this study was to identify the properties of granular active and powdered active white soil and mix them to make cement-based active white soil adsorbent matrix for carbon dioxide, fine dust and radon gas adsorption, and to evaluate indoor air improvements according to the mixing scale. The results of the experiment showed that active carbon dioxide adsorption performance increased for carbon dioxide and radon as the exchange rate increased through physical adsorption. In particular, the higher the replacement rate of the granular active bag, the better adsorption performance was shown.

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Properties of Water-Based According to Particle Size of Granular Activated Clay (입상형 활성백토의 입자크기에 따른 수성도료의 특성)

  • Choi, Byung-Cheol;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.19-20
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    • 2021
  • In order to reduce the emission of harmful substances that degrade indoor air quality, the Ministry of Environment strengthened the standards for the content of VOCs in paints to supply and sell eco-friendly paints. In this related study, an eco-friendly paint mixed with a powder-type absorbent material was prepared and its characteristics were reviewed. As the amount of powder-type absorbent material increased, the workability (viscosity, peeling, etc) decreased. Accordingly, this study aims to examine which particle size is suitable according to the particle size of the granular adsorbent while improving the problem of the powdery adsorbent by using the granular adsorbent. As an experimental plan, the particle size of granular activated clay is selected to be 0.250, 0.425, 0.710(mm), and the decrease rate of VOCs concentration and impact resistance are reviewed. As a result of the experiment, as the particle size of the granular activated clay increased, the decrease rate of the VOCs concentration increased and the impact resistance improved. Therefore, considering the problems that occur after actual painting, the particle size of granular activated clay of 0.425mm is suitable.

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Properties of Functional Heating Paints according to Additional Ratio of Activated Clay (활성백토 첨가율에 따른 기능성 발열도료의 특성)

  • Lee, Ju-Won;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.35-36
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    • 2023
  • Safety management of steel frame members is a very important part to maintain safety and function. However, precise inspection is not possible for steel frame members due to finishing materials and insulation materials, leading to poor inspection. For steel members, an insulating spray coating method is used for high thermal conductivity. The insulation spray method is not only uneconomical, but also has the disadvantage of spoiling the aesthetics. In addition, VOCs are released from paints used in spraying, so a solution is needed. In this study, heating paint was used to improve the disadvantages of the insulation spray coating method and the high thermal conductivity of steel frame members. In addition to this, in order to reduce VOCs generated from the paint, active clay was added to produce a functional exothermic paint, and then the experiment was conducted. As the amount of activated clay increased, the film thickness increased, and the VOCs emission and thermal conductivity decreased.

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Adsorptive Removal of Radionuclide Cs+ in Water using Acid Active Clay (산활성 점토를 이용한 수중의 방사성 핵종 Cs+ 흡착 제거)

  • Lee, Jae Sung;Kim, Su Jin;Kim, Ye Eun;Kim, Seong Yun;Kim, Eun;Ryoo, Keon Sang
    • Journal of the Korean Chemical Society
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    • v.66 no.2
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    • pp.78-85
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    • 2022
  • Natural white clay was treated with 6 M of H2SO4 and heated at 80℃ for 6 h under mechanical stirring and the resulting acid active clay was used as an adsorbent for the removal of Cs+ in water. The physicochemical changes of natural white clay and acid active clay were observed by X-ray Fluorescence Spectrometry (XRF), BET Surface Area Analyser and Energy Dispersive X-line Spectrometer (EDX). While activating natural white clay with acid, the part of Al2O3, CaO, MgO, SO3 and Fe2O3 was dissolved firstly from the crystal lattice, which bring about the increase in the specific surface area and the pore volume as well as active sites. The specific surface area and the pore volume of acid active clay were roughly twice as high compared with natural white clay. The adsorption of Cs+ on acid active clay was increased rapidly within 1 min and reached equilibrium at 60 min. At 25 mg L- of Cs+ concentration, 96.88% of adsorption capacity was accomplished by acid active clay. The adsorption data of Cs+ were fitted to the adsorption isotherm and kinetic models. It was found that Langmuir isotherm was described well to the adsorption behavior of Cs+ on acid active clay rather than Freundlich isotherm. For adsorption Cs+ on acid active clay, the Langmuir isotherm coefficients, Q, was found to be 10.52 mg g-1. In acid active clay/water system, the pseudo-second-order kinetic model was more suitable for adsorption of Cs+ than the pseudo-first-order kinetic model owing to the higher correlation coefficient R2 and the more proximity value of the experimental value qe,exp and the calculated value qe,cal. The overall results of study showed that acid active clay could be used as an efficient adsorbent for the removal of Cs+ from water.