scholarly journals Recovery of Al and Na Values from Red Mud by BaO-Na2CO3Sinter Process

2011 ◽  
Vol 8 (3) ◽  
pp. 1387-1393 ◽  
Author(s):  
S.N. Meher ◽  
A.K. Rout ◽  
B.K. Padhi
Keyword(s):  
Red Mud ◽  
Sinter Process ◽  
Barium Oxide ◽  
Sodium Aluminate ◽  
Sintering Process ◽  
Process Stream ◽  
Sinter Method ◽  
Barium Silicate ◽  
High Temperature Reaction ◽  
Waste Handling

The red mud BaO-Na2CO3sinter process can be used in combination with the Bayer process to recover sodium and aluminium from the red mud waste and direct it back to the process stream. This is facilitated by the high temperature reaction of BaO-Na2CO3and De-silication product (Sodalite) (DSP) in the red mud to produce an insoluble di-barium silicate, barium titanate, barium ferrite and a soluble sodium aluminate. A variation of the red mud BaO-Na2CO3sintering process using half the barium oxide of existing methods has been investigated. The barium to silicon ratio was reduced from 2 to 1 producing a sodium barium silicate (Na2BaSiO4) rather than the di-barium silicate (Ba2SiO4) insoluble phase produced in the existing BaO-Na2CO3sinter method. Synthetic BaO-Na2CO3sinter products were investigated to understand the phases produced during sintering at varying temperatures and the chemistry of extraction. The target phases and morphological behaviors of sinter products were seen in XRD and SEM and the highest extractions were produced from a sinter temperature of 1000 °C for 4 h. A two-stage (105 °C / 60 min, 105 °C / 240 min) water or caustic leaching process was found to be most effective for extraction. Sodium and aluminium extractions were 99% and 99.5% respectively. The experimental method devised was then used to treat red mud and the target phases were produced. An extraction of sodium and aluminium of 94% and 87% respectively was achieved. Silicon extractions were below 2%. Production benefits include sodium hydroxide savings, liquor burning, increased aluminium extraction and reduced cost of waste handling.

Synthesis of Zeolite Added Clay and Sewage Sludge

2009 ◽  
Vol 620-622 ◽  
pp. 229-232
Author(s):  
Yeong Seok Yoo ◽  
Kyeong Ho Cheon ◽  
Jae Ik Lee ◽  
Hyo Jin Ban ◽  
Gyu Tae Seo
Keyword(s):  
High Temperature ◽  
Sewage Sludge ◽  
Ion Exchange ◽  
Hydrothermal Method ◽  
Sodium Aluminate ◽  
Liquid Sodium ◽  
Sintering Process ◽  
Zeolite X ◽  
High Temperature Process ◽  
X Zeolite

Zeolite has been used as catalyzer, absorbent, ion-exchange matter and dehydrating agent due to its excellent catalytic property and ion-exchange. In recent years, many studies have been conducted to apply zeolite as new materials such as zeolite membranes and zeolite sensor films. To introduce properties of zeolite, it should be examined how zeolite could be reacted other materials. In this study, it is investigated whether zeolite is successfully synthesized or not when clay and/or sewage sludge coexist with zeolite precursor. Zeolite precursor was made of liquid sodium silicate and sodium aluminate. Mixing ratio of caly and/or sewage sludge is 0-10%(wt.). To compare two processes, the mixture was synthsized by hydrothermal method and high temperature sintering process. It is synthesized by hydrothermal with sintering at high temperature process. The resulting materials were characterized by XRD and SEM. As a result, various type of zeolite such as zeolite X, zeolite A and zeolite P1 was successfully synthesized by hydrothermal method when clay and/or sewage coexist with zeolite precursor. However, zeolite was rarely synthesized by high temperature sintering process. Therefore, when preperation of zeolite material mixed with other material such as clay and sewage sludge, hydrothermal method is more effective than sintering at high temperature process.

scholarly journals Study the Recycling of Red Mud in Iron Ore Sintering Process

2021 ◽  
Vol 22 (6) ◽  
pp. 191-201
Author(s):  
Ahmed Khalifa ◽  
Vladimir Bazhin ◽  
Yana Kuskova ◽  
Ahmed Abdelrahim ◽  
Yasser Ahmed
Keyword(s):  
Red Mud ◽  
Iron Ore ◽  
Sintering Process ◽  
Iron Ore Sintering ◽  
Iron Ore Sintering Process ◽  
Ore Sintering

scholarly journals The Role of Aluminium in the Synthesis of Mesoporous 4H Silicon Carbide

2015 ◽  
Vol 821-823 ◽  
pp. 970-973
Author(s):  
Jeanette Hvam ◽  
Per Morgen ◽  
Terence Edwin Warner ◽  
Eivind Morten Skou ◽  
Thomas Wolff
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Particulate Filter ◽  
High Porosity ◽  
Sintering Process ◽  
Diesel Particulate ◽  
High Temperature Reaction ◽  
Ternary Carbides ◽  
Highly Porous

Aluminium is found to play a key role in the process of forming a mechanically stable and highly porous and granular structure of 4H silicon carbide. The material is prepared by a high temperature reaction of the elemental constituents. The reactions are carried out under different background atmospheres, including nitrogen. Ternary carbides containing Al, Si and N, are formed in the process, and are believed to be responsible for the final outcome of the process, at the highest reaction temperatures, in the form of pure, well-connected grains of 4H-SiC forming a strong and rigid structure with high porosity. The Al containing compounds function as structural promoters for the 4H polytype recrystallization. This is expected - and partly shown - to take place through substitution with 4H-SiC and evaporation of all other constituents during the high temperature sintering step. When extruded into honeycomb structures prior to the sintering process this pure mesoporous SiC final product turns out to be ideal for a combined diesel particulate filter with support for catalysts in the pores.

Heat Preservation Time on the Properties of Red Mud Lightweight Insulation Brick

2014 ◽  
Vol 540 ◽  
pp. 225-228 ◽  
Author(s):  
Long Ma ◽  
Guo Zhong Li ◽  
Ji Rui Hu
Keyword(s):  
Electron Microscope ◽  
Fly Ash ◽  
Scanning Electron Microscope ◽  
Red Mud ◽  
Sintering Temperature ◽  
Raw Material ◽  
Sintering Process ◽  
Heat Preservation ◽  
Fluxing Agent ◽  
Scanning Electron

The red mud lightweight insulation brick was prepared by the sintering process as red mud, fly ash, bentonite as the main raw material, adding a certain amount of pore forming agent and fluxing agent. The sintering heat preservation time of red mud insulation brick on the properties was studied. The red mud lightweight insulation brick damage fracture microstructure was analyzed using scanning electron microscope (SEM) and the sintering mechanism was discussed preliminarily. The results show that with sintering temperature of 1100°C heating for 180 minutes, the performance of thermal insulation brick is better. When the heat preservation time extends to continue, the performances of sample remain stable basically.

Adsorption of methylene blue from aqueous solutions onto sintering process red mud

2012 ◽  
Vol 47 (1-3) ◽  
pp. 31-41 ◽  
Author(s):  
Luyi Zhang ◽  
Huayong Zhang ◽  
Yonglan Tian ◽  
Zhongshan Chen ◽  
Lu Han
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Red Mud ◽  
Sintering Process
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