• Title/Summary/Keyword: 전기로슬래그

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Leaching of Ca, Fe and Si in Electric Arc Furnace Steel Slag by Aqueous Acetic acid Solution for Indirect Carbonation (간접탄산염화를 위한 전기로제강슬래그 중 Ca, Fe 및 Si 성분의 초산수용액 침출)

  • Youn, Ki-Byoung
    • Resources Recycling
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    • v.26 no.1
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    • pp.37-42
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    • 2017

  • It has been reported that aqueous indirect carbonation process of calcium silicate mineral could be one of the most promising methods for $CO_2$ sequestration. The process consists of two main steps, extraction of Ca from calcium silicate and carbonation of the extracted solution by $CO_2$. Many types of acids such as HCl and $HNO_3$ can be used in the extraction step of the process. In the case of using aqueous acetic acid solution as the extraction solvent, acetic acid can be reproduced at the carbonation step of the extracted solution by $CO_2$ and recycled to extraction step for reuse it. Industrial by-products such as iron and steel slags are potential raw materials of the indirect carbonation process due to their high contents of calcium silicate. In this study, in order to examine the extraction efficiency of domestic electric arc furnace steel slag by aqueous acetic acid solution, extraction experiments of the slag were performed by using the aqueous acetic acid solutions of varying extraction conditions ; acetic acid concentrations, extraction temperatures and times.

  • https://doi.org/10.7844/kirr.2017.26.1.37 인용 PDF KSCI

A Study on Validation of the Shielding Effectiveness Measurement Method of the Concrete Containing Electric Arc Furnace Oxidizing Slag (전기로산화슬래그를 활용한 콘크리트의 차폐효과 측정 방법의 유효성 검증 연구)

  • Jang, Hong-Je;Lee, Han-Hee;Choi, Hyo-Sik;Song, Tae-Seung;Cho, Won-Seo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.4
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    • pp.478-482
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    • 2021

  • In this paper, methods for manufacturing shielding concrete by recycling steelmaking slag discarded as industrial waste and measuring the shielding effectiveness of the shielding concrete were studied. By comparing the result of shielding effectiveness measurement of this concrete block with shielding effectiveness measurement of the structure constructed with this concrete, the measurement system for measuring shielding effectiveness of the concrete block was verified. The size of the concrete stru ctu re is 2.9 × 2.9 × 3.4m and the concrete block is 0.3 × 0.3 × 0.2m. The frequ ency band u sed for mesu rement is 600MHz - 2GHz, the types of concrete u sed to measu re the shielding effectiveness are general concrete and concrete containing electric arc furnace oxidizing slag. In the case of the concrete structure, reinforcing rebars are installed at intervals of 15cm for stru ctu ral safety, as the frequ ency increase, the electromagnetic wave properties of rebars gradu ally decreased, there was a slight difference in the measurement results. In conclusion, the measurement result of shielding effectiveness of the concrete block is similar to the result of the concrete structure. It is thought that it can be sufficiently utilized for electromagnetic wave engineering design, and the concrete shielding effectiveness measurement system using standard specimens was verified.

  • https://doi.org/10.14190/JRCR.2021.9.4.478 인용 PDF KSCI

Carbonation Resistance Property of Mortar using Electrolysis Aqueous (전기분해수를 배합수로 활용한 모르타르의 탄산화 저항 특성)

  • Jeong, Su-Mi;Park, Sun-Gyu
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.10 no.3
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    • pp.204-210
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    • 2022

  • Cement is pointed out as the main cause of carbon dioxide emission in the construction industry. Many researchs are underway to use blast furnace slag, an industrial by-product, as a substitute for cement to reduce carbon dioxide emitted during the manufacturing the cement. When blast furnace slag is used as a substitute for cement, it has advantages such as long-term strength and chemical resistance improvement. However, blast furnace slag has a problem that makes initial strength low. This is due to the impermeable film on the surface created during the production of blast furnace slag. The created film is known to be destroyed in an alkaline environment, and based on this, previous studies have suggested a solution using various alkali activators. But, alkali activator is dangerous product since it is a strong alkaline material. And it has the disadvantage in price competitiveness. In this study, an experiment was conducted to improve the initial hydration reactivity of the blast furnace slag to secure the initial strength of the mortar substituted with the blast furnace slag and to check whether the carbonation resistance was increased. As a result of the experiment, it was confirmed that the mortar using alkaline water showed higher strength than the mortar using tap water, and there were more hydration products generated inside. In addition, it was confirmed that the mortar using alkaline water as a compounding water had high carbonation resistance.

  • https://doi.org/10.14190/JRCR.2022.10.3.204 인용 PDF KSCI