scholarly journals Effects of CaO Addition on the Iron Recycling from Nickel Slags by Oxidation-Magnetic Separation

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 956 ◽  
Author(s):  
Yongbo Ma ◽  
Xueyan Du
Keyword(s):  
Phase Diagrams ◽  
Magnetic Separation ◽  
Thermodynamic Analysis ◽  
Crystallization Temperature ◽  
Total Iron ◽  
Iron Recovery ◽  
Characteristic Temperatures ◽  
Air Atmosphere

To recover iron from water-quenched nickel slags, CaO was added. Thermodynamic analysis showed that CaO promotes the reaction between fayalite (Fe2SiO4) and O2. Phase diagrams of the FeO-SiO2-MgO-CaO slag with various CaO contents in an air atmosphere drawn by FactSage 7.1 showed that the phase components can be significantly affected by the CaO contents. With increasing CaO content, the fusion characteristic temperatures decreased rapidly to a minimum and subsequently increased slightly. The oxidization of Fe2SiO4 in nickel slags was accelerated significantly by the addition of CaO, which led to an increase of FeO activity and decrease of Fe2O3 activity to promote the formation of MgFe2O4. Excess addition of CaO led to the formation of more silicates. In addition, the crystallization temperature was also reduced with increasing CaO content, causing less spinel to crystalize. With increasing CaO content, the iron recovery and yield of concentrate first increased and subsequently decreased, while the total iron (TFe) content was almost not influenced and maintained a relatively stable value.

Crystallization in Metal-Metalloid Multilayers

1995 ◽  
Vol 382 ◽  
Author(s):  
R. Sinclair ◽  
T. J. Konno ◽  
T. Itoh ◽  
N. C. Zhu
Keyword(s):  
Phase Diagrams ◽  
Crystallization Temperature ◽  
Metal Layer ◽  
Eutectic Phase ◽  
Crystal Nucleation ◽  
General Phenomenon ◽  
Crystalline Phases ◽  
Reaction Systems ◽  
Binary Eutectic ◽  
Rapid Diffusion

ABSTRACTWe have studied the reactions which occur in metal-metalloid multilayers made from elements which have binary eutectic phase diagrams. The metal mediates crystallization of the amorphous as-deposited metalloid by crystal nucleation inside the metal layer followed by rapid diffusion through the metal from amorphous to crystalline phases. The metalloid crystallization temperature is significantly reduced by this reaction. Systems showing this behavior are Al-Si, Ag-Si, Ag-Ge, Co-C, Ni-C and Fe-C. We believe, therefore, that it is a general phenomenon which we have now extended to the case of Ag-SiC.

Binary common-ion alkali halide mixtures thermodynamic analysis of solid-liquid phase diagrams

Calphad ◽  
1983 ◽  
Vol 7 (3) ◽  
pp. 211-218 ◽  
Author(s):  
Harry A.J. Oonk ◽  
Jacobus G. Blok ◽  
Joke A. Bouwstra
Keyword(s):  
Liquid Phase ◽  
Phase Diagrams ◽  
Thermodynamic Analysis ◽  
Alkali Halide ◽  
Common Ion ◽  
Solid Liquid

Optimization of magnetic separation process for iron recovery from steel slag

2017 ◽  
Vol 24 (2) ◽  
pp. 165-170 ◽  
Author(s):  
Yuan-pei Lan ◽  
Qing-cai Liu ◽  
Fei Meng ◽  
De-liang Niu ◽  
Heng Zhao
Keyword(s):  
Magnetic Separation ◽  
Steel Slag ◽  
Separation Process ◽  
Iron Recovery

Stepped-Flotation of Mixed Magnetic Concentrate Carbonates-Containing in Donganshan

2012 ◽  
Vol 454 ◽  
pp. 292-298
Author(s):  
An Lin Shao
Keyword(s):  
Negative Influence ◽  
Total Iron ◽  
Closed Circuit ◽  
Reverse Flotation ◽  
Iron Recovery ◽  
High Quality ◽  
Iron Concentrate ◽  
Iron Grade ◽  
Hematite Concentrate

There are nearly 500 million tons of hematite ores carbonate-containing in Donganshang, China. However, the flotation flowsheet previously of in that area was seriously affected by the siderite. Therefore, many ores could not be processed by ordinary methods. In this study, mixed magnetic concentrate in scene was beneficiated by stepped-flotation, in which siderite was separated in first direct flotation step to eliminate its negative influence on hematite flotation, and then the high quality hematite concentrate could be obtained by second reverse flotation step. When the feed was mixed magnetic concentrate in scene with total iron grade of 42.84% and siderite content of 4.04%, an iron concentrate with iron grade of 67.84% and iron recovery of 69.47% was obtained in closed circuit of stepped-flotation.

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