• Title/Summary/Keyword: red-mud

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Strength and Reaction Characteristic of the Hardened Blast Furnace Slag Paste using the Alkali Accelerator (알칼리 자극제를 사용한 고로슬래그 경화체의 반응 및 강도특성)

  • Kim, Yun-Mi;Park, Sun-Gyu;Lee, Sang-Soo;Song, Ha-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.313-314
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    • 2013
  • The study carried out the experiment with presenting as the fundamental data for developing non-cement by using red mud generated in blast furnace slag and bauxite generated in the process of manufacturing the pig iron process of manufacturing Al(OH)3/Al2O from as the binding material using the accelerator of NaOH. After fixing the thing and the NaOH adding the blast furnace slag and NaOH 10, 20, 30 (%) with 10, 20, 30 (%) substituted the red mud in the blast furnace slag and the experimental method carried out the experiment. And it measured the flexural strength and compressive strength and took a photograph EDS analysis and SEM. Consequently, the compressive strength was improved as the addition rate of the NaOH was high and the compressive strength according to the replacement ratio of the red mud was degraded. This is determined that film of the blast furnace slag is destroyed and it makes the hydration reaction condition and the intensity is revealed.

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Feasibility of Industrial by-products as a Seed Crystal of Struvite Crystallization for the Removal of Highly Concentrated Nitrogen and Phosphorus (고농도의 질소와 인제거를 위한 Struvite 정석반응의 정석재로서 산업부산물의 이용 가능성)

  • Yim, Soo-Bin
    • Journal of Korean Society on Water Environment
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    • v.26 no.4
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    • pp.664-672
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    • 2010
  • This study was performed to evaluate the feasibility of industrial by-products such as converter slag, olivine, red mud and fly ash as a seed crystal of struvite crystallization for the removal of highly concentrated $NH_4-N$ and $PO_4-P$. In the kinetic experiments, more than 90% of $NH_4-N$ and $PO_4-P$ was eliminated by struvite crystallization within 30 minutes of reaction time. The pH range in meta-stable region of struvite crystallization was found to be pH 7.0~9.0 under the Mg:N:P=1:1:1 equi-molar condition with 100 mg/L of $NH_4-N$. Total removal efficiencies of $NH_4-N$ and $PO_4-P$ by both struvite precipitation and crystallization were increased with the increase of pH. Removal efficiencies of $NH_4-N$ and $PO_4-P$ were significantly enhanced by struvite crystallization using industrial by-products as a seed crystal compared with those by struvite precipitation without seed crystal. Red mud, converter slag, olivine and fly ash enhanced the removal efficiencies of $NH_4-N$ by 40.9%, 37.7%, 28.4% and 16.4%, respectively. Removal efficiencies of $PO_4-P$ for converter slag, red mud, fly ash, olivine were increased by 3.7 times, 2.6 times, 72.4% and 68.0%, respectively. Converter slag and red mud showed higher feasibility as a seed crystal than others for the removal of highly concentrated $NH_4-N$ and $PO_4-P$. In particular, converter slag might have a high capacity of phosphorus removal.

Stabilization of Heavy Metal-Contaminated Mine Tailings Using Phosphate Fertilizers and Red Mud (인산염 비료 및 레드머드를 이용한 중금속 오염 광미의 안정화)

  • Kang, Sin-Hyun;Ahn, Jun-Young;Hwang, Kyung-Yup;Seo, Jeong-Yun;Kim, Jae-Gon;Song, Ho-Cheol;Yim, Soo-Bin;Hwang, In-Seong
    • Journal of Soil and Groundwater Environment
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    • v.16 no.5
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    • pp.31-41
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    • 2011
  • The objectives of this study were to investigate the efficiencies of the stabilizers such as mono-potassium phosphate (MKP), phosphate fertilizer and red mud in treating the mine tailings contaminated with heavy metals and to characterize the changes in fractionations of the heavy metals during the stabilization. The TCLP results showed that the stabilization efficiencies of Cd, Pb and Zn increased with the increase in the stabilizer dosage and the reaction times. MKP showed the highest efficiencies for the heavy metals stabilization among the stabilizers tested. When the mine tailings were amended with MKP, the TCLP concentrations of Cd, Pb and Zn were reduced by 79~97%, 61~84%, and 89~99%, respectively. When the composite stabilizers, MKP/phosphate fertilizer or MKP/red mud, were used, the stabilization efficiencies were lower than when MKP was used as a single stabilizer. The sequential extraction results showed that carbonates fraction of Cd and Zn increased generally. Especially, when red mud was used, carbonates fraction of Cd and Zn increased 5 and 18 times, respectively. In the case of Pb, the treatment with MKP increased residual fraction by 10 times. The results showed that MKP was the most effective in stabilizing the heavy metals (Cd, Pb and Zn) to improve the efficacy of the composite binders.

Strength Properties of according to the Red mud replacement of Lightweight Matrix based on Blast Furnace Slag (고로슬래그 기반 경량 경화체의 레드머드 치환에 따른 강도특성)

  • Kim, Yun-Mi;Kim, Won-Jong;Park, Sun-Gyu;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.244-245
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    • 2014
  • This is an experimental study on manufacturing of non-cement matrix. Materials like cement and blowing agent in foamed concrete is replaced by by-products from blast furnace slag and paper ash. Further, the experiment was performed by replacing alkali with red mud by (0, 5, 10, 15, 25, 35, 45) of weight of alkali (wt.%) in order to reduce the amount of expensive alkali acclerator. Sample Plain with density showed lowest. The compressive strength test result, showed a similar trend with density. And it showed that compressive strength of the RM-0.05 was highest.

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The waste reduction technology of chloride contaminated red-mud from by-product of Bayer process

  • Shin, Hee-Young;Hyun, Jong-Yeong;Masuda, Kaoru;Ohya, Hitoshi;Endoh, Shigehisa
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.598-602
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    • 2003
  • The general red-mud minerals consist of hematite, sodalite, anatase, quartz, gibbsite and miner impurities. This gives serious environmental damage for the ocean disposal. It mixed with chloride compound and the content of chlorine is about 2,000-3,000ppm. This paper can be suggested the chloride reduction technology that is applied basically mineral processing by physical separation. Then it can be possible to produce the totally 24wt. $\%$ useful red-mud which chloride content is less then 400ppm.

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A Study on the Physical Property of concrete using Industrial by-product and Alkali Activators (산업부산물과 알칼리 활성제를 사용한 콘크리트의 물리적 특성에 관한 연구)

  • Lee, Sun-Kwan;Kim, Young-Su
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.11a
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    • pp.54-55
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    • 2013
  • Recently, The economic growth has increased carbon dioxide emissions. so, It is caused by social problem to environmental damage and human health due to global warming. Accordingly, The method solution is to the amount of cement and to use industrial by-product such as Blast furnace slag, Fly Ash, and Red-mud. Thus, The purpose of this study is to analyze the physical property of concrete with red-mud. So, this study carries out the basic performance test of concrete such as, air content, slump, and compressive strength. In this work test is conducted according to sequence of materials using concrete twin mixer.

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Characteristics of red mud-added soil concrete according to aggregate type and binder amount (골재종류 및 바인더량에 따른 레드머드 첨가 흙콘크리트의 특성)

  • Park, Kyu-Eun;Hong, Suk-Wo;Kim, Sang-Jin;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.31-32
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    • 2023
  • In this paper, in order to utilize recycled aggregate as an alternative to natural resources in the construction industry, the physical properties of red mud-added soil concrete according to the type of aggregate and amount of binder were reviewed. The results of using waste asphalt concrete as a natural aggregate substitute were SPS-KSCICO- It was found to satisfy the compressive strength standards for parking lots of 001-2006, and its applicability in the construction industry was judged.

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Characteristics of Red Mud-Added Soil Concrete according to Binder Amount and Water Binder Ratio (바인더량 및 물바인더비에 따른 레드머드 첨가 흙콘크리트의 특성)

  • Kim, Sang-Jin;Hong, Suk-Wo;Park, Kyu-Eun;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.81-82
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    • 2023
  • As part of a study to utilize recycled aggregates in the construction industry, this paper attempted to examine recycled aggregates from waste concrete, a construction waste, and red mud, an industrial by-product, by applying them to earthen concrete packaging materials. As a result, it was found to satisfy the compressive strength standards for parking lots of SPS-KSCICO-001-2006, and its applicability in the construction industry was judged.

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Characteristics of Mortar Mixed Nitric Acid Neutralized Red Mud by Cement Type (시멘트 종류별 질산 중화 레드머드 혼입 모르타르의 특성)

  • Kang, Suk-Pyo;Hong, Seong Uk;Kim, Sang-Jin;Hong, Seok-Woo
    • Journal of the Korea Institute of Building Construction
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    • v.23 no.6
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    • pp.693-702
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    • 2023
  • This research explores the potential application of Liquid Red Mud(LRM), a byproduct of industrial processes, in the construction sector. We neutralized LRM(pH 10-12) using nitric acid, aiming to understand its viability in construction applications. The study involved substituting LRM(pH 7-8) in mortar formulations, varying by cement type. We assessed the properties of these mixtures by measuring flow, setting time, and compressive strength. Additionally, X-ray Diffraction(XRD) and Scanning Electron Microscopy(SEM) analyses were conducted to examine the chemical properties. Results indicated a reduction in flow value for LRM and LN(neutralized LRM) compared to the control (Plain ) across different cement types. The setting times(initial and final) for LRM and LN were notably shorter than Plain. In compressive strength tests, LRM replaced with slag cement showed enhanced initial strength, though long-term strength gains were marginal across different cement types. SEM analysis revealed distinct voids in Plain and LN, with LRM exhibiting a fibrous microstructure. XRD patterns in SN(slag neutralized) resembled those in OR(original red mud) and ON(original neutralized), with a notable peak at a 2θ value of 22°. The study concludes that unneutralized LRM, when substituted for slag cement in mortar, yields superior initial strength compared to its neutralized counterpart.

A Study on the Recycling of Red Mud as the Raw Materials for the Manufacture of Clay Brick (점토벽돌 제조용 원료로서 레드머드 재활용에 관한 연구)

  • Kang, Hye-Ju;Lee, Yeong-Hun;Lee, Hee-Ra;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.21-22
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    • 2019
  • This study is designed to apply natural clay replaceable redmud as ceramic material by mixing redmud with the materials used in existing brickmaking in laboratory environment. Therefore, through this study, the redmud is recycled as a raw material for clay bricks and presented as a basic material for the use of redmud in clay bricks.

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