Sulfur Dioxide Absorption in a Bubbling Reactor with Suspensions of Bayer Red Mud

2007 ◽  
Vol 46 (21) ◽  
pp. 6770-6776 ◽  
Author(s):  
Elisabetta Fois ◽  
Antonio Lallai ◽  
Giampaolo Mura
Keyword(s):  
Sulfur Dioxide ◽  
Red Mud ◽  
Bayer Red Mud

scholarly journals Sulfur Fixation by Chemically Modified Red Mud Samples Containing Inorganic Additives: A Parametric Study

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Yang Liu ◽  
Yang Li ◽  
Feng-shan Zhou ◽  
Ying-mo Hu ◽  
Yi-he Zhang
Keyword(s):  
Sulfur Dioxide ◽  
Magnesium Oxide ◽  
Red Mud ◽  
Mother Liquor ◽  
Mass Ratio ◽  
Fixation Rate ◽  
Natural Mineral ◽  
Chemically Modified ◽  
Bayer Red Mud ◽  
Sulfur Fixation

Sulfur retention ability of Bayer red mud from alumina plant was investigated. Bayer red mud modified by fusel salt and waste mother liquor of sodium ferrocyanide as the main sulfur fixation agent and the calcium based natural mineral materials as servicing additives; the experimental results showed the following: (1) Through 10 wt% waste mother liquor of sodium ferrocyanide modifying Bayer red mud, sulfur fixation rate can increase by 13 wt%. (2) Magnesium oxide can obviously improve the sulfur fixation performance of Bayer red mud and up to a maximum sulfur fixation rate of 47 wt% at adding 1 wt% magnesium oxide. (3) Dolomite enhanced the sulfur fixation performances with the sulfur fixation rate of 68 wt% in optimized condition. (4) Vermiculite dust reduced sulfur dioxide during the fixed-sulfur process of modified Bayer red mud, and the desulphurization ration could reach up to a maximum 76 wt% at 950°C. (5) An advanced three-component sulfur fixation agent was investigated, in which the optimized mass ratio of modified Bayer red mud, dolomite, and vermiculite dust was 70 : 28 : 2 in order, and its sulfur fixation efficiency has reached to a maximum 87 wt% under its 20 wt% dosage in the coal.

Comprehensive Recovery of Iron and Aluminum from Ordinary Bayer Red Mud by Reductive Sintering–Magnetic Separation–Digesting Process

JOM ◽  
2019 ◽  
Vol 71 (9) ◽  
pp. 2936-2943 ◽  
Author(s):  
Feng Gao ◽  
Jihao Zhang ◽  
Xinjie Deng ◽  
Kaituo Wang ◽  
Chunlin He ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Red Mud ◽  
Bayer Red Mud ◽  
Comprehensive Recovery

scholarly journals Improving the flame retardancy of ethylene vinyl acetate composites by incorporating layered double hydroxides based on Bayer red mud

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Yi Qian ◽  
Kangjia Jiang ◽  
Long Li
Keyword(s):  
Vinyl Acetate ◽  
Flame Retardancy ◽  
Layered Double Hydroxides ◽  
Red Mud ◽  
Ethylene Vinyl Acetate ◽  
Precipitation Method ◽  
Infrared Spectrometry ◽  
Cone Calorimeter Test ◽  
Bayer Red Mud ◽  
Double Hydroxides

AbstractNowadays, reducing the hazards of bayer red mud (BRM) is an important research direction in the fields of environmental and safety. In this article, Mg/Al/Fe ternary layered double hydroxides (Mg/Al/Fe-LDHs) were synthesized successfully by a co-precipitation method based on introducing Mg2+ into the BRM suspension. The thermogravimetric analysis (TGA) results showed that the decomposition rate of LDHs is higher than that of BRM, which indicates that LDHs can absorb more heat than BRM during the decomposition process. Subsequently, BRM and LDHs were added into the ethylene vinyl acetate (EVA) to investigate its effects on reducing flammability of the composites. The cone calorimeter test (CCT) results demonstrated that 50 wt% LDH-B can make the peak value of HRR (PHRR) decrease from 1694.8 kW/m2 (EVA) to 199.2 kW/m2 (ELDH2). The smoke density test (SDT) results showed that the luminous flux of ELDH2 is nearly 95% at the end of test with a pilot flame, which is much higher than that of EVA and EBRM. The thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR) results confirmed that LDHs can improve the thermal stability of composites and reduce the production of some toxic gases. Compared with BRM, the improved flame retardancy of Mg/Al/Fe-LDHs is ascribed to the introduction of Mg2+, which offering an enhanced catalytic carbonization capability, as well as the physical barrier effect of char residue layer catalyzed by the lamellar LDHs

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