• Title/Summary/Keyword: red-mud

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Characteristic of Compressive Strength with Respect to Curing Conditions in Cement Mortar of Content Red Mud (레드머드를 대체한 시멘트 모르타르의 양생방법에 따른 압축강도 특성)

  • Hwang, Byoung Il;Kang, Hye Ju;Lee, Hoo Seok;Kang, Suk Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.13-14
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    • 2017
  • Red mud is an inorganic by-product produced from the mineral processing of alumina from Bauxite ores. This study is to investigate characteristic with respect to curing conditions according to the red mud content. The results best of best showed that the water curing compressive strength better than atmospheric curing, steam curing.

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Application of the Color concrete with Red mud to the Floor Construction (레드머드를 이용한 바닥컬러콘크리트의 현장적용)

  • Kim, Tae-Cheong;Kim, Jong;Jeon, Chung-Keun;Yeon, Kyu-Won;Yoon, Gi-Woon;Shin, Dong-An
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2008.11a
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    • pp.27-30
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    • 2008
  • This study investigated the application of red muds, which were industrial wastes fired at 800℃, with a coloring agents. The results were summarized as following. The slumpflow, air content and unit weight volume were satisfied with each target values. The setting time was shortened on the case that 3 % of the red coloring agent and fired red mud were simultaneously replaced about 1 hour compared with the previous study which was 6 % of the red coloring agent was individually used. For the length change ratio caused by drying shrinkage and depth of neutralization on hardened concrete, they were declined when 3 % of the red coloring agent and fired red mud were simultaneously replaced compared with the previous study. On the measurement of forming colors, the case that 3 % of the red coloring agent and fired red mud were simultaneously replaced was similar to the previous study.

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A Study for Recoverability of Iron Resource in Red Mud (레드머드 내 철 자원 회수 가능성 고찰)

  • Kim, Bong-Ju;Kwon, Jang-Soon;Koh, Yong-Kwon;Park, Cheon-Young
    • Economic and Environmental Geology
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    • v.53 no.3
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    • pp.297-306
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    • 2020
  • The red mud generated from bauxite during the Bayer alumina production process has been regarded as an industrial waste due to the high alkaline property and high content of Na. Despite of its environmental problem, various studies for recovery of the valuable resources from red mud has been also carried out because of high content (25.7 wt.% as Fe2O3 in this study) of iron in red mud. In order to recover the iron resource in the red mud, microwave heating experiments were performed with adding of activated carbon and elemental sulfur to the red mud. Through the microwave heating the powdered red mud mixtures converted to porous and vitrified solid aggregates. The vitrified aggregates produced by microwave heating are composed of goethite, zero valent iron (Fe0), pyrrhotite and pyrite. And then, the microwave heating samples were dissolved in the aqua regia solution, and Fe precipitates were obtained as a Fe-chlorides by adding of NaCl salt in the aqua regia solution. The Fe recovery rates in the Fe-chloride precipitates showed differences depending on the experimental mixture conditions, and Fe grades of the end products are 49.0 wt.%, 58.0 wt.% and 59.5 wt.% under mixture conditions of red mud, red mud + activated carbon, and red mud + activated carbon + elemental S, respectively. The Fe content of 56.0 wt.% is generally known as the grade value of Fe in a iron ore for iron production, and the Fe grades of microwave heating samples with adding activated carbon and elemental S in this study are higher than the grade value of 56.0 wt.%.

Evaluation of Dispersion Characteristics for Liquefied Red Mud by Viscosity and Sediment Index (점도 및 침전지수에 의한 액상화 레드머드의 분산 특성평가)

  • Kang, Suk-Pyo;Kang, Hye-Ju
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.6
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    • pp.517-525
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    • 2017
  • Red mud is an industrial by-product produced during the manufacturing aluminum hydroxide ($Al(OH)_3$) and aluminum oxide($Al_2O_3$) from Bauxite ores. In Korea, approximately 2 tons of red mud in a sludge form with 50% moisture content is produced when 1ton of $Al_2O_3$ is produced through the Bayer process. In the paper, dispersion characteristics of liquefied red mud that does not require heating and grinding process for recycling were investigated through viscosity and sediment index. The results showed that the sediment index of liquefied red mud increased but viscosity of that decreased with a higher W/R ratio. Also we proposed the range of initial viscosity from 2000cP to 8000cP and target sedimentation index below 20% at elapsed time 180days for stable dispersion of liquefied red mud.

Effect of Red Mud Addition to Polyolefin (폴리올레핀에 대한 적니의 첨가효과)

  • Lee, Keun Young;Kim, Jeong Ho
    • Clean Technology
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    • v.6 no.2
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    • pp.93-99
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    • 2000
  • Effect of amount of red mud and processing method on the tensile and impact properties of polymers were investigated when the red mud was added as a filler to polypropylene (PP), low density polyethylene (LDPE) and PP/LDPE blend. Especially in case of PP, increase in the tensile strength, elongation at break and absorbed energy was observed when extrusion was carried out more than two times. Tensile strength showed a very remarkable increase when master batch was used in comparison with simple multiple extrusion. In case of LDPE, 10% addition of red mud resulted in the increase of tensile modulus and impact strength, while 20% addition caused a decrease in the same properties. Addition of 5% EVA could reverse this trend. Addition of 20% red mud to PP/LDPE blend gave a decrease in impact strength but 5% EPR compatibilizer could improve the impact properties. Above results showed that the processing method is a very important factor in the utilization of red mud as a plastic fillers and master batch is one of the very effective way of red mud addition.

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Pore and Efflorescence Characteristics of Alkali Activated Slag-Red Mud Cement Mortar depending on Red Mud Content (레드머드 대체율에 따른 알칼리활성화 슬래그-레드머드 시멘트 모르타르의 기공 및 백화특성)

  • Kang, Suk-Pyo;Kang, Hye-Ju
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.3
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    • pp.261-268
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    • 2017
  • Red mud is an inorganic by-product obtained from the mineral processing of alumina from Bauxite ores. A highly alkali inorganic waste product with a pH level over 11, red mud in its original state negatively impacts the ecosystem, so appropriate treatment is necessary. The development of alkali activated slag-red mud cement can be a representative study aimed at recycling the strong alkali of the red mud as a construction material. However, Alkali-activated binders that use sodium activators have been reported to be more vulnerable to efflorescence. Therefore, in this study, the compressive strength, pore characteristics, water absorption, elution characteristics, and efflorescence properties of alkali-activated slag cement mortar were assessed according to their red mud substitution ratio.

Characteristics of Red mud Ceramics according to Sintering Temperature and Contents of Red Mud from Industrial Byproducts (산업부산물 레드머드 첨가량에 따른 소성온도별 레드머드 세라믹의 특성)

  • Kang, Suk-Pyo;Kang, Hye-Ju;Lee, Min-Hi
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.5
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    • pp.401-409
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    • 2019
  • This paper aims to recycle red mud from a byproduct in the alumina industry as an alternative raw material for depleted natural resources. In order to apply red mud as a ceramic material, red mud ceramics were prepared according to mixing and temperature in a laboratory environment. Compared with KS L 4201 in terms of compression ratios and absorptions, it is found that two kinds of conditions for one type and three conditions for two types meet the standard. When red mud is used as a clay brick raw material, the substitution ratio of red mud is 10% or less, and the firing temperature is considered to be appropriate at $1200^{\circ}C$. In order to apply red mud to clay brick raw material in actual field, various samples and firing temperature should be considered in the future.

Field Application Assessment of Alkali-Activated Slag-Red Mud Soil Mixed Pavement (알칼리활성화 슬래그-레드머드 흙포장재의 현장 적용평가)

  • Kang, Hye Ju;Hwang, Byuong Il;Kim, Jae Hwan;Kang, Suk Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.107-108
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    • 2017
  • In this search, by evaluating the field applicability of soil mixed pavement of Red mud is mixed into the soil mixed pavement field applicability, and tries to present the basic data about the site application of recycling of red mud and low carbon construction material to. As a result, the conventional soil concrete organization standards (SPS-KSCICO-001: 2003) meets the criteria for parking lot, making use of red mud, natural color as well as the natural loess is expressed.

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A Study on the Hardening Characteristics of Alumino-Silicate Inorganic Binder Using Red-Mud according to Curing Temperature (레드머드를 활용한 알루미노 규산염계 무기결합재의 양생온도별 경화특성에 관한 연구)

  • Lee, Yeong-Won;Kang, Suk-Pyo;Lee, Jun;Kim, Jae-Hwan
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.259-262
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    • 2012
  • Recently, as the national policy of green growth is promoted, construction field also makes an effort to reduce CO2 gas released when producing cement continuously. In other words, as the method solving environmental pollution and resources exhaustion, lots of mineral material compounds such as blast furnace slag powder which is industrial by-product, fly ash, red mud, etc. are examined to bo used as the substitute good of cement Therefore this study is to investigate the hardening characteristics of alumino-silicate inorganic binder using red-mud used as a accelerator of industrial by-product such as fly ash and blast furnace slag powder according to curing temperature. As a result, it is effective to use red-mud as the accelerator of inorganic binder with other additory accelerators.

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Study on the Recovery of value metals from red mud (Red mud에서 유가금속 회수에 관한 고찰)

  • Lim, Ki-Hyuk;Kim, Jin-Uk;Jung, Yu-Jin;Hong, Sung-Gil;Shon, Byung-Hyun
    • Proceedings of the KAIS Fall Conference
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    • 2011.12a
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    • pp.277-279
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    • 2011
  • Red mud는 Bauxite 광물을 정제하여 알루미나를 생산하는 과정에서 발생하는 산업 고형 폐기물이다. Red mud 내에는 경제적으로 가치 있는 다양한 금속 성분과 희토류 등이 함유되어 있다. 하지만 적절한 처리법이 없어 현재 산업폐기물로 방치되고 있는 실정이며, 방치되고 있는 red mud 내에 함유되어 있는 독성물질은 수질 및 토양 등의 환경오염을 유발의 원인이 되고 있다. 이로 인해 본 논문에서는 보다 효율적으로 처리하기 위해 유가 금속을 회수 하는 방법을 알아보았다.

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