scholarly journals Correction to: “Advanced Method for Recycling Red Mud by Carbothermal Solid-Phase Reduction Using Sodium Sulfate”

Metallurgist ◽  
2020 ◽  
Vol 63 (11-12) ◽  
pp. 1345-1345 ◽  
Author(s):  
P. I. Grudinskii ◽  
D. V. Zinoveev ◽  
A. F. Semenov ◽  
A. S. Zakunov ◽  
V. G. Dyubanov ◽  
...  
Keyword(s):  
Red Mud ◽  
Sodium Sulfate ◽  
Solid Phase ◽  
Advanced Method ◽  
Phase Reduction

Advanced Method for Recycling Red Mud by Carbothermal Solid-Phase Reduction Using Sodium Sulfite

Metallurgist ◽  
2020 ◽  
Vol 63 (9-10) ◽  
pp. 889-897
Author(s):  
P. I. Grudinskii ◽  
D. V. Zinoveev ◽  
A. F. Semenov ◽  
A. S. Zakunov ◽  
V. G. Dyubanov ◽  
...  
Keyword(s):  
Red Mud ◽  
Sodium Sulfite ◽  
Solid Phase ◽  
Advanced Method ◽  
Phase Reduction

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.

Solid-Phase Reduction and Iron Grain Growth in Red Mud in the Presence of Alkali Metal Salts

2018 ◽  
Vol 2018 (11) ◽  
pp. 1020-1026 ◽  
Author(s):  
P. I. Grudinskii ◽  
V. G. Dyubanov ◽  
D. V. Zinoveev ◽  
M. V. Zheleznyi
Keyword(s):  
Alkali Metal ◽  
Grain Growth ◽  
Red Mud ◽  
Solid Phase ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
Phase Reduction

scholarly journals Influence of Cu on the Improvement of Magnetic Properties and Structure of L10 FePt Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1097
Author(s):  
Luran Zhang ◽  
Xinchen Du ◽  
Hongjie Lu ◽  
Dandan Gao ◽  
Huan Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Reduction Method ◽  
Solid Phase ◽  
Average Particle Size ◽  
Fept Nanoparticles ◽  
Average Particle ◽  
Phase Reduction ◽  
Different Temperatures ◽  
One Step

L10 ordered FePt and FePtCu nanoparticles (NPs) with a good dispersion were successfully fabricated by a simple, green, one-step solid-phase reduction method. Fe (acac)3, Pt (acac)2, and CuO as the precursors were dispersed in NaCl and annealed at different temperatures with an H2-containing atmosphere. As the annealing temperature increased, the chemical order parameter (S), average particle size (D), coercivity (Hc), and saturation magnetization (Ms) of FePt and FePtCu NPs increased and the size distribution range of the particles became wider. The ordered degree, D, Hc, and Ms of FePt NPs were greatly improved by adding 5% Cu. The highest S, D, Hc, and Ms were obtained when FePtCu NPs annealed at 750 °C, which were 0.91, 4.87 nm, 12,200 Oe, and 23.38 emu/g, respectively. The structure and magnetic properties of FePt and FePtCu NPs at different annealing temperatures were investigated and the formation mechanism of FePt and FePtCu NPs were discussed in detail.

scholarly journals STUDY ON DYES ADSORPTION FROM AQUEOUS SOLUTION USING RED MUD ACTIVATED BY SULFURIC ACID

2019 ◽  
Vol 62 (11) ◽  
pp. 143-149
Author(s):  
Vu Xuan Minh ◽  
Nguyen Tuan Dung ◽  
Hương T. M. Le
Keyword(s):  
Red Mud ◽  
Textile Industry ◽  
Solid Phase ◽  
Second Order ◽  
Iron Sulfate ◽  
Activation Process ◽  
Acid Activation ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Reactive Red 195

The textile industry wastewater contains the majority of different dyes which are quite toxic and should be removed before disposal. They are often highly resistant for biodegradation and hence are difficult to be treated. The application of adsorbents of natural origin, especially industrial waste, is one of the most attractive solutions for wastewater treatments due to its high socio-economic advantages. In this study, the adsorption capacity of acid activiated red mud for some conventional dyes such as Reactive Red 195 and Direct Yellow 132 was investigated. In this acid activation process part of aluminum oxide, iron oxide on red mud will be dissolved into solution, thereby increasing the specific surface area of the remaining solid phase (from 55 m2/g to 92 m2/g). The amount of red mud dissolved in the solution is about 30% weight. Solid residue is used in this adsorption study. The solution obtained after activation which includes iron sulfate salts, aluminum sulfate used as a coagulant for wastewater treatment. The results showed that, for both dyes, pH 5 is most suitable for the adsorption processes. The adsorption kinetic was based on the pseudo second-order kinetic equation. The rate constants of the second-order model for adsorption of DY132, RR195 on RMA in a solution with a concentration of 100 mg·l-1, pH = 5 are 1.48 and 1.95·10-2 g/(mg·min), respectively, and the equilibrium adsorption capacities are 42.74 and 54.95 mg·g-1, respectively. The adsorption data were well matched to Langmuir isotherm model. The maximum adsorption capacities were found to be 48.54 and 84.31 (mg·g-1) for Reactive Red 195 and Direct Yellow 132, respectively.

The Metallurgical Characterization of Iron-Containing Concentrate

2020 ◽  
Vol 989 ◽  
pp. 428-433
Author(s):  
B.M. Myrzaliev ◽  
Kulgamal A. Nogaeva ◽  
E.B. Kolmachikhina
Keyword(s):  
Solid Phase ◽  
Metallic Copper ◽  
Iron Alloys ◽  
Metallic Phase ◽  
Phase Reduction ◽  
Slag Copper ◽  
Metallurgical Characterization ◽  
Two Phases ◽  
Metallization Process

The expediency of processing iron-containing concentrate with low iron content, increased content of manganese and copper is considered in the article. To process such a concentrate, a metallization process is proposed to produce sponge iron with a reducing agent - carbon. It was found that in solid-phase reduction at 1150 °C iron is reduced to a greater extent, as well as small particles with a copper content of about 95%, manganese is not recovered. The simulation process of metallization with carbon at a temperature of 1250 °C shows that iron is mainly distributed in the metallic phase, to a lesser extent in slag phases, manganese is distributed in two phases - metal and slag, copper is presented as a separate phase of metallic copper in the composition with iron alloys, and also composes a part of iron alloys. The reduction degree from concentrate to the metallic part is 80 - 91% for iron and 95 - 98% for copper. The presence of metallized particles of various sizes, representing phases of iron with manganese and copper was found in the slags.

Solid-phase reduction of waste products from steelmaking

Metallurgist ◽  
2012 ◽  
Vol 56 (1-2) ◽  
pp. 91-96 ◽  
Author(s):  
A. N. Dildin ◽  
V. I. Chumanov ◽  
I. V. Chumanov ◽  
V. E. Eremyashev
Keyword(s):  
Solid Phase ◽  
Waste Products ◽  
Phase Reduction
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