A Study on the Characterization of Red Mud

Nath, Harjeet; Sahoo, Abanti

doi:10.18000/ijabeg.10118

Cited by 19 publications

(6 citation statements)

References 8 publications

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“…The chemical components of red mud are Al 2 O 3 (17%-20%), Fe 2 O 3 (48%-54%), SiO 2 (4%-6%), TiO 2 (3%-4%), Na 2 O (3%-5%), and CaO (1%-2%) [3]. The disposal of red mud is becoming a major problem for industries, as it can lead to soil and water pollution owing to its high alkalinity [4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Adding Neutralized Red Mud on the Hydration Properties of Cement Paste

Kang

Hye-Ju

Lee³

2020

Materials

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Red mud is a highly alkaline waste by-product of the aluminum industry. Although recycling of red mud is being actively researched, a feasible technological solution has not been found yet. In this study, we propose that neutralization of red mud alkalinity could assist in its use as a construction material. Neutralized red mud (LRM + S; pH 6–8) was prepared by adding sulfuric acid to liquefied red mud (LRM; pH 10–12). After adding LRM and LRM + S to cement paste, the heat of hydration, compressive strength, and hydration products were examined. The experiments revealed that the calorific value of the cement paste with LRM was low, and its peak was delayed, when compared with that of plain cement paste (referred to as Plain), whereas the calorific value of the cement paste with LRM + S was similar to that of Plain. At the age of 28 d, the compressive strength of the cement paste with 10% LRM + S was 99% whereas that with 20% LRM was only 55% of the strength of Plain. Thus, our results help to resolve the issue of strength degradation of cementitious materials observed upon the addition of red mud and enable its reuse as a construction material.

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Section: Introductionmentioning

confidence: 99%

Effects of Adding Neutralized Red Mud on the Hydration Properties of Cement Paste

Kang

Hye-Ju

Lee³

2020

Materials

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“…The XRD patterns in Fig. 1 show that RM is mainly composed of hematite (2q = 24, 33, 35.5, 41, and 49.4 o ) and gibbsite (2q = 18, 21.2, and 37 o ), besides the peak of calcite (2q=29 o ) [14]. The patterns for ZRM show that the peaks of gibbsite and calcite have disappeared, with the peaks for hematite in the same position but higher and sharper compared to that of raw RM.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Cr(VI) by material synthesized from red mud and rice husk ash

Nguyen¹,

Nguyễn²,

Nguyen³

et al. 2018

VJSTE

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In this work, the efficiency of a material prepared from red mud and rice husk ash (ZRM), in Cr(VI) absorption, without the use of acid to neutralize raw red mud (RM), was examined. The physicochemical characteristics of the obtained material were determined by several methods, including BET nitrogen adsorption, XRD, SEM, and TEM. ZRM was employed in the adsorption of Cr(VI) in solution at 25 o C with a Cr(VI) concentration of 20 ppm. The results showed that the nano particles of material were formed within the size range of 30-50 nm, and that the specific surface area of the material was 70.76 m 2 /g. The conditions of the adsorption process (i.e., the initial pH of the solution, the stirring rate, and the material content) were seen to significantly affect the efficiency of Cr(VI) adsorption at the material's surface. The optimum conditions for Cr(VI) adsorption via ZRM were determined as pH=2, a stirring rate of 300 rpm, and a material content of 10 g/l. With these conditions, the maximum adsorption capacity for Cr(VI) in a solution of ZRM was found to be 23.32 mg/g.

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“…1) showed the presence of several peaks at 2ª = 24.4, 29.8, 34. 63.5 and 64.5°; 27) the peak at 2ª = 34.5°may also indicate the presence of rutile phase of TiO 2 , calcite (CaCO 3 ). The reflection peak at 2ª = 24.4°also represents Quartz (SiO 2 ).…”

Section: Characteristics Of Samplesmentioning

confidence: 98%

CuO-Doped Catalyst Synthesized from Red Mud and Rice Husk Ash Using Urea-Nitrate Combustion Technique for <i>p</i>-Xylene Deep Oxidation

et al. 2019

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To propose an effective CuO-doped catalyst fabricated from red mud and rice hush ash for deep oxidation and emphasize the relation between properties and activity of catalysts, in this work, 5 mass% CuO-doped materials fabricated from red mud and rice husk ash were synthesized using urea/nitrate combustion technique. Effect of urea/nitrate molar ratios on properties and activity of prepared material in pxylene deep oxidation was also investigated. The obtained catalysts were characterized by several techniques such as X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area and Hydrogen Temperature Program Reduction (H 2 -TPR). The results showed that the change in urea/nitrate ratio could reduce CuO crystallite size of catalyst and enhance its reducibility leading to an increase of catalyst's oxidative activity. The 5 mass% CuO-doped material with nanoparticles of about 20 nm synthesized with urea/nitrate molar ratio of 2 showed the best activity in p-xylene deep oxidation at the temperature range of 275400°C. The deep oxidation of p-xylene to CO 2 was almost complete at 400°C and WHSV of 12,000 mL•h ¹1 •g ¹1 . This study found an alternative, lowcost and friendly way for the exploitation of catalyst based on waste materials red mud and rice husk ash. The modification of CuO-doped material by using urea as a fuel in the preparation is one of the most promising approaches, toward the development of effective VOCs oxidation. The cheap catalyst obtained in this work can be applied in the treatment of VOCs in polluted air.

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A Study on the Characterization of Red Mud

Cited by 19 publications

References 8 publications

Effects of Adding Neutralized Red Mud on the Hydration Properties of Cement Paste

Effects of Adding Neutralized Red Mud on the Hydration Properties of Cement Paste

Adsorption of Cr(VI) by material synthesized from red mud and rice husk ash

CuO-Doped Catalyst Synthesized from Red Mud and Rice Husk Ash Using Urea-Nitrate Combustion Technique for <i>p</i>-Xylene Deep Oxidation

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