Thermodynamic Analysis of V-concentrating Phase Formation in V-bearing Steelmaking Slag Modified by MgO

2015 ◽  
Vol 34 (6) ◽  
Author(s):  
Liushun Wu ◽  
Wei Gao ◽  
Dawei Xie ◽  
Liaosha Li ◽  
Yuanchi Dong
Keyword(s):  
Solid Solution ◽  
Magnesium Oxide ◽  
Thermodynamic Analysis ◽  
Phase Formation ◽  
Calcium Silicate ◽  
Experimental Results ◽  
Calcium Ferrite ◽  
Steelmaking Slag

AbstractIn the study, magnesium oxide acting as modifier was added to V-bearing steelmaking slag to concentrate vanadium, and then the effect of magnesium oxide on the formation of V-concentrating phase during cooling was investigated. Experimental results show that, in the case of the original slag, di-calcium silicate along with most of vanadate and phosphate in the slag forms solid solution, calcium ferrite which contains small part of vanadium in the slag and matrix without vanadium in turn precipitate during slowly cooling; For the sample with 8% MgO addition, two new phases (merwinite and V-concentrating phase) generate during slowly cooling, and the amount of di-calcium silicate decreases. Merwinite phase doesn’t contain vanadium, and V-concentrating phase (Ca

Combustion co-synthesis of Si3N4-based in situ composites

1996 ◽  
Vol 11 (12) ◽  
pp. 2968-2970 ◽  
Author(s):  
J. T. Li ◽  
W. S. Liu ◽  
Y. L. Xia ◽  
C. C. Ge
Keyword(s):  
Solid Solution ◽  
Silicon Carbide ◽  
Silicon Nitride ◽  
Thermodynamic Analysis ◽  
Experimental Results ◽  
Titanium Carbonitride ◽  
In Situ Composites

The feasibility of synthesizing silicon nitride-silicon carbide-titanium carbonitride composites by combustion reactions is demonstrated. With titanium carbonitride taken to be an ideal solid solution, its composition is determined as TiC0.36N0.64. Thermodynamic analysis supports the experimental results.

Precipitation Behavior of V-Enrichment Mineral in Steelmaking Slag Bearing Vanadium Modified by SiO2

2013 ◽  
Vol 295-298 ◽  
pp. 1729-1734
Author(s):  
Liu Shun Wu ◽  
Yun Zhou ◽  
Yuan Chi Dong
Keyword(s):  
Calcium Silicate ◽  
Converter Slag ◽  
Dicalcium Silicate ◽  
Experimental Results ◽  
Steelmaking Slag ◽  
Precipitation Behavior ◽  
Silicate Phase ◽  
Rich Phase ◽  
Addition Amount

In order to concentrate vanadium in converter slag bearing vanadium, the effect of SiO2 on behavior of vanadium in the process of enriching was studied. Experimental results show that, during cooling, dicalcium silicate containing vanadium and phosphorus precipitate first from original slag. For original with 7% SiO2, most of vanadium dissolves in calcium silicate phase. However, the proportion of dicalcium silicate is big. For slag modified by 12% SiO2, during cooling, two vanadium-rich minerals precipitate firstly, i.e. Ca3(V,P)2O8(30-33%V2O5) and Ca3(V,P)2O8•nCa2SiO4 (14-31%V2O5), then 3CaO•2SiO2 (2-4%V2O5) generates. With addition amount of SiO2 increasing, the proportion of 3CaO•2SiO2 decreases gradually, and the content of vanadium in vanadium-rich phase increases gradually. So appropriate SiO2 addition can suppress the precipitation of Ca2SiO4 and Ca3•Si2O7, and promote the generation of vanadium-rich phase.

In-situ formed Co from Co-Mg-O solid solution synergizing with LiH for efficient ammonia synthesis

2021 ◽  
Author(s):  
Wenbo Gao ◽  
Sheng Feng ◽  
Hanxue Yan ◽  
Qianru Wang ◽  
Hua Xie ◽  
...  
Keyword(s):  
Solid Solution ◽  
Metal Nanoparticles ◽  
Magnesium Oxide ◽  
Ammonia Synthesis ◽  
Oxide Solid Solution ◽  
In Situ Formation

A cobalt magnesium oxide solid solution (Co-Mg-O) supported LiH catalyst has been synthesized, in which LiH functions both as a strong reductant for in-situ formation of Co metal nanoparticles and...

A review on phase prediction in high entropy alloys

2021 ◽  
pp. 095440622110089
Author(s):  
Vinay Kumar Soni ◽  
S Sanyal ◽  
K Raja Rao ◽  
Sudip K Sinha
Keyword(s):  
Solid Solution ◽  
Phase Formation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Modeling Tools ◽  
High Entropy ◽  
Recent Developments ◽  
Phase Prediction ◽  
The Stability

The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

Topologically Close-packed Phase Formation in High Entropy Alloys: A Review of Calphad and Experimental Results

JOM ◽  
2017 ◽  
Vol 69 (11) ◽  
pp. 2113-2124 ◽  
Author(s):  
K. Guruvidyathri ◽  
K. C. Hari Kumar ◽  
J. W. Yeh ◽  
B. S. Murty
Keyword(s):  
Phase Formation ◽  
Experimental Results ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Topologically Close Packed

Single-burn clinkering of endodontic calcium silicate-based cements: Effects of ZnO in the C3S phase formation and hydration rate

2021 ◽  
pp. 131556
Author(s):  
Marcelo Tramontin Souza ◽  
Paulo Ricardo de Matos ◽  
José da Silva Andrade Neto ◽  
Rafael Dors Sakata ◽  
Carlos Eduardo Maduro de Campos ◽  
...  
Keyword(s):  
Phase Formation ◽  
Calcium Silicate ◽  
Hydration Rate

Phase-formations of Mg2P2O7–Mn2P2O7 mixed pyrophosphates and their desired luminescence abilities

2021 ◽  
Author(s):  
Donglei Wei ◽  
Hyo Jin Seo
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Phase Formation ◽  
High Thermal Stability

Phase-formation and luminescence depend on the Mn2+ contents in Mg2P2O7–Mn2P2O7 solid-solution. The mixed pyrophosphate of α- and β-phases shows the best luminescence, high thermal stability and efficient excitation in UV and near UV region.

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