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

Recovery of ferric oxide from bayer red mud by reduction roasting-magnetic separation process

2016 ◽  
Vol 31 (2) ◽  
pp. 404-407 ◽  
Author(s):  
Yanjie Liu ◽  
Kesheng Zuo ◽  
Guang Yang ◽  
Zhe Shang ◽  
Jianbin Zhang
Keyword(s):  
Magnetic Separation ◽  
Ferric Oxide ◽  
Red Mud ◽  
Separation Process ◽  
Reduction Roasting ◽  
Bayer Red Mud

Study on Recovering Iron from Shandong Red Mud Based on Gas Reduction Reaction

2015 ◽  
Vol 1092-1093 ◽  
pp. 1041-1045
Author(s):  
Xing Wu Hou ◽  
Yu Min Wu ◽  
Ding Guo Huang ◽  
Yan Yang Gao ◽  
Jian Guo Liao ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Red Mud ◽  
Direct Reduction ◽  
Reduction Reaction ◽  
Raw Material ◽  
Magnetic Separations ◽  
Bayer Red Mud ◽  
Roasting Temperature ◽  
Reduction Effect ◽  
Basic Characteristics

Based on Shandong Renping Bayer red mud as the raw material, analyzing its basic characteristics, the result is that the content of total iron in red mud is 29.55%. Gas-based high-temperature direct reduction experiments are made by using a gas mixture of CO and H2O as a reducing agent. And then the reduction effect was investigated by magnetic separation experiments, to realize that separation of iron minerals from red mud. The results show that the consequent of the magnetic separation is improved obviously with the temperature rising. Under these conditions, namely, the roasting temperature being 1050°C, the roasting time lasting 90 minutes, the reduction gas rate being 0.7 m3/min, the magnetic field being 2.2A, and three magnetic separations, the iron recovery ratio in red mud is over 97%.

scholarly journals Influence of Sodium Sulfate Addition on Iron Grain Growth during Carbothermic Roasting of Red Mud Samples with Different Basicity

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1571
Author(s):  
Pavel Grudinsky ◽  
Dmitry Zinoveev ◽  
Denis Pankratov ◽  
Artem Semenov ◽  
Maria Panova ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Grain Growth ◽  
Red Mud ◽  
Sodium Sulfate ◽  
Phase Distribution ◽  
Solid Phase ◽  
Alumina Production ◽  
Metallic Particles ◽  
Iron Phase ◽  
High Alkalinity

Red mud is an iron-containing waste of alumina production with high alkalinity. A promising approach for its recycling is solid-phase carbothermic roasting in the presence of special additives followed by magnetic separation. The crucial factor of the separation of the obtained iron metallic particles from gangue is sufficiently large iron grains. This study focuses on the influence of Na2SO4 addition on iron grain growth during carbothermic roasting of two red mud samples with different (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21, respectively. Iron phase distribution in the red mud and roasted samples were investigated in detail by Mössbauer spectroscopy method. Based on thermodynamic calculations and results of multifactorial experiments, the optimal conditions for the roasting of the red mud samples with (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21 were duration of 180 min with the addition of 13.65% Na2SO4 at 1150 °C and 1350 °C followed by magnetic separation that led to 97% and 83.91% of iron recovery, as well as 51.6% and 83.7% of iron grade, respectively. The mechanism of sodium sulfate effect on iron grain growth was proposed. The results pointed out that Na2SO4 addition is unfavorable for the red mud carbothermic roasting compared with other alkaline sulfur-free additives.

Recovering metals from red mud by thermal treatment and magnetic separation

JOM ◽  
1996 ◽  
Vol 48 (1) ◽  
pp. 25-28 ◽  
Author(s):  
Paolo Plescia ◽  
Dante Maccari
Keyword(s):  
Thermal Treatment ◽  
Magnetic Separation ◽  
Red Mud

Recovery of iron from high-iron red mud using suspension magnetization roasting and magnetic separation

2022 ◽  
Vol 178 ◽  
pp. 107394
Author(s):  
Jianwen Yu ◽  
Yanfeng Li ◽  
Yang Lv ◽  
Yuexin Han ◽  
Peng Gao
Keyword(s):  
Magnetic Separation ◽  
Red Mud ◽  
High Iron
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