Rheology of Blast Furnace Slags with Defined Concentrations of Titanium Oxides

2014 ◽  
Vol 611-612 ◽  
pp. 1645-1656
Author(s):  
Piotr Migas ◽  
Marta Korolczuk-Hejnak
Keyword(s):  
Blast Furnace ◽  
Chemical Properties ◽  
Viscosity Coefficient ◽  
Reduction Reaction ◽  
Reducing Conditions ◽  
Rheological Character ◽  
Semi Solid ◽  
Solid Slag ◽  
Physical And Chemical ◽  
Titanium Compounds

800x600 The applying of burden materials containing titanium compounds in the blast furnace process and the processes of forming titanium carbides and nitrides has a directly impact on the physical and chemical properties of slag and pig iron. Thereby affecting the course of the process, its efficiency and economy. It is known that the dynamic viscosity coefficient of slag – with an increased titanium compounds content in the reducing conditions of the blast furnace - may rapidly change. The products of the reduction reaction, precipitation and separation of titanium compounds are responsible for the thickening effect of the slag and the problems of permeability of blast furnace, causing anomalies in the functioning of the unit. The presence of solid components (particles) in the melts determines the rheological character of the entire system.Authors have performed a rheological study of synthetic furnace slag concentration of TiO2 in the range of 6% to 30%. The measurements were performed at temperatures in the range between 1310-1490oC. The obtained results made it possible to analyze the rheological characteristics of liquid and semi-solid slag systems and produce flow curves. Identifying the rheological character of semi-solid slag systems provides opportunities for the development of a mathematical model of liquid phase flow in a dripping zone of the blast furnace, allowing for example to indentify the unstable parts of a metallurgical aggregate. Normal 0 21 false false false PL X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:Standardowy; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";}

Rheology of Blast Furnace Slags Admitted High Concentration of Titanium Oxides

2013 ◽  
Vol 554-557 ◽  
pp. 536-546
Author(s):  
Piotr Migas ◽  
Marta Korolczuk-Hejnak
Keyword(s):  
Blast Furnace ◽  
Chemical Properties ◽  
Viscosity Coefficient ◽  
Reduction Reaction ◽  
High Concentration ◽  
Reducing Conditions ◽  
Rheological Character ◽  
Semi Solid ◽  
Solid Slag ◽  
Titanium Compounds

The applying of burden materials containing titanium compounds in the blast furnace process and the processes of forming titanium carbides and nitrides has a directly impact on the physical and chemical properties of slag and pig iron. Thereby affecting the course of the process, its efficiency and economy. It is known that the dynamic viscosity coefficient of slag – with an increased titanium compounds content in the reducing conditions of the blast furnace - may rapidly change. The products of the reduction reaction, precipitation and separation of titanium compounds are responsible for the thickening effect of the slag and the problems of permeability of blast furnace, causing anomalies in the functioning of the unit. The presence of solid components (particles) in the melts determines the rheological character of the entire system. Authors have performed a rheological study of synthetic furnace slag concentration of TiO2 in the range of 6% to 30%. The measurements were performed at temperatures in the range between 1310-1490oC. The obtained results made it possible to carry out the rheological characteristics of analyzed liquid and semi-solid slag systems and draw of flow curves. Identifying the rheological character of semi-solid slag systems provides opportunities for the development of mathematical modeling of liquid phase flows in a dripping zone of the blast furnace, allowing e.g to indentify the unstable parts of a metallurgical aggregate.

scholarly journals High-Temperatures Rheometric Analysis Of Selected Heterogeneous Slag Systems

2015 ◽  
Vol 60 (2) ◽  
pp. 697-704 ◽  
Author(s):  
P. Migas
Keyword(s):  
Blast Furnace ◽  
Viscosity Coefficient ◽  
Reduction Reaction ◽  
Reducing Conditions ◽  
Rheological Character ◽  
Semi Solid ◽  
Solid Slag ◽  
The Impact ◽  
Titanium Compounds ◽  
Made In

Abstract It is known that the dynamic viscosity coefficient of slag – with an increased titanium compounds content in the reducing conditions of the blast furnace - may rapidly change. The products of the reduction reaction, precipitation and separation of titanium compounds are responsible for the thickening effect of the slag and the problems of permeability of blast furnace, causing anomalies in the dipping zone. The presence of solid components (particles) in the melts determines the rheological character of the entire system. Identifying the rheological character of semi-solid slag systems provides opportunities for the development of mathematical modeling of liquid phase flows in a dripping zone of the blast furnace, allowing e.g to indentify the unstable parts of a metallurgical aggregate. Author have performed study of synthetic aluminosilicates slag concentration of TiO2 in the range up to 30%, systems were doped solids TiN also, it was made in order to assess the impact of the type forming areas/units of the SRO nature on the rheological identification mentioned systems. The high-temp rheometric measurements were performed at temperatures in the range between 1310-1490°C. The obtained results made it possible to carry out the rheological characteristics of analyzed liquid and semi-solid slag systems.

scholarly journals Analysis of the Rheological Behaviour of Selected Semi-Solid Slag Systems in Blast Furnace Flow Conditions

2015 ◽  
Vol 60 (1) ◽  
pp. 85-93 ◽  
Author(s):  
P. Migas
Keyword(s):  
Blast Furnace ◽  
Rheological Behaviour ◽  
Viscosity Coefficient ◽  
Ideal Liquid ◽  
Flow Conditions ◽  
Hot Metal ◽  
Measurement Results ◽  
Flow Through ◽  
Semi Solid ◽  
Solid Slag

Abstract The rheological properties of liquid and semi-solid systems of slag and hot metal in a blast furnace are extremely important from the perspective of their dripping in the unit. The rheological nature and the values of the dynamic viscosity coefficient of liquid and semi-solid phases - slag and hot metal - determine the permeability of the zones in which those systems exist. The modelling of dripping processes and e.g. static and dynamic holding/retention of liquid in the bed, requires an accurate description of the rheological behaviour of slag and iron systems. Determining the liquid flow through the lump bed of the blast furnace is based on the assumption that liquids in the unit in the whole range of their occurrence are similar to a Newtonian ideal liquid. This study presents an analysis of the findings of high-temperature rheometric measurements of CaO-SiO2-Al2O3-MgO systems, liquid, semi-solid slags of the blast furnace type doped with TiO2 and solids in the form of TiN. The tests were performed within a temperature range of 1310-1490°C. Also measurement results for glycerol solutions with concentrations of 86% and 100% at the ambient temperature, simulating blast furnace slags with various contents of solids - PC, anthracite - are presented.

Reduction Roasting of Titaniferous Ores

2019 ◽  
Vol 391 ◽  
pp. 215-220 ◽  
Author(s):  
Andrey N. Dmitriev ◽  
R.V. Petukhov ◽  
G.Yu. Vitkina ◽  
E.A. Vyaznikova
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Chemical Properties ◽  
Furnace Process ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Titanium Dioxide Content ◽  
Physical And Chemical ◽  
And Chemical Properties

Questions regarding the oxidizing roasting of raw iron ore materials (agglomerate and pellets) are studied. Features of the phase structure of raw iron ore materials containing titanium and vanadium are discussed. Reducibility, durability, and temperatures of the softening and melting of metallurgical raw iron ore materials are studied in vitro. Object of research – titaniferous ores with various titanium dioxide content. The behavior of agglomerate and pellets in a blast furnace are studied, as well as the influence of their physical and chemical properties on heat and mass transfer processes using a mathematical model of the blast furnace process [1].

scholarly journals A Comparison of Laboratory Coal Testing with the Blast Furnace Process and Coal Injection

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1476
Author(s):  
Julian Steer ◽  
Mark Greenslade ◽  
Richard Marsh
Keyword(s):  
Blast Furnace ◽  
Laboratory Data ◽  
Chemical Properties ◽  
Volatile Matter ◽  
Matter Content ◽  
Drop Tube ◽  
Coal Blend ◽  
A Minor ◽  
Production Period ◽  
Physical And Chemical

The injection of coal through tuyeres into a blast furnace is widely adopted throughout the industry to reduce the amount of coke used and to improve the efficiency of the iron making process. Coals are selected depending on their availability, cost, and the physical and chemical properties determined by tests, such as the volatile matter content, fixed carbon, and ash content. This paper describes research comparing the laboratory measured properties of injection coals that were used over a two-month production period compared to the process variables and measurements of the blast furnace during that study period. In addition to the standard tests, a drop tube furnace (DTF) was used to compare the burnout of coals and the char properties against the production data using a range of statistical techniques. Linear regression modelling indicated that the coal type was the most important predictor of the coal rate but that the properties measured using laboratory tests of those coals were a minor feature in the model. However, comparisons of the Spearman’s correlations between different variables indicated that the reverse Boudouard reactivity of the chars, prepared in the DTF from the coals, did appear to be related to some extent to the coal and coke rates on production. It appears that the constant process adjustments made by the process control systems on the furnace make it difficult to identify strong correlations with the laboratory data and that the frequency of coal sampling and the coal blend variability are likely to contribute to this difficulty.

scholarly journals Atomic-Level Functionalized Graphdiyne for Electrocatalysis Applications

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 929
Author(s):  
Xiaodong Qian ◽  
Yongshen Zheng ◽  
Songhua Chen ◽  
Jialiang Xu
Keyword(s):  
Structural Characteristics ◽  
Chemical Properties ◽  
Reduction Reaction ◽  
Atomic Level ◽  
Research Progress ◽  
Coupling Reactions ◽  
Surface Areas ◽  
Potential Development ◽  
Synthesis Strategy ◽  
Physical And Chemical

Graphdiyne (GDY) is a two-dimensional (2D) electron-rich full-carbon planar material composed of sp2- and sp-hybridized carbon atoms, which features highly conjugated structures, uniformly distributed pores, tunable electronic characteristics and high specific surface areas. The synthesis strategy of GDY by facile coupling reactions under mild conditions provides more convenience for the functional modification of GDY and offers opportunities for realizing the special preparation of GDY according to the desired structure and unique properties. These structural characteristics and excellent physical and chemical properties of GDY have attracted increasing attention in the field of electrocatalysis. Herein, the research progress in the synthesis of atomic-level functionalized GDYs and their electrocatalytic applications are summarized. Special attention was paid to the research progress of metal-atom-anchored and nonmetallic-atom-doped GDYs for applications in the oxygen reduction reaction (ORR), the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) catalytic processes. In addition, several potential development prospects and challenges of these 2D highly conjugated electron-rich full-carbon materials in the field of electrocatalysis are presented.

scholarly journals Recent Progress in Designing Halide-Perovskite-Based System for the Photocatalytic Applications

2021 ◽  
Vol 8 ◽  
Author(s):  
Yizhou Zhao ◽  
Lanning Wang ◽  
Tinglu Song ◽  
Alexander Mudryi ◽  
Yujing Li ◽  
...  
Keyword(s):  
Reaction System ◽  
Chemical Properties ◽  
Reduction Reaction ◽  
Environmental Application ◽  
Device Structures ◽  
Perovskite Material ◽  
Light Management ◽  
Halide Perovskite ◽  
Physical And Chemical ◽  
Photocatalytic Applications

The halide perovskite material has attracted vast attention as a versatile semiconductor in the past decade. With the unique advantages in physical and chemical properties, they have also shown great potential in photocatalytic applications. This review aims at the specific design principles triggered by the unique properties when employing halide-perovskite-based photocatalytic systems from the following perspectives: (I) Design of photoelectrocatalytic device structures including the n-i-p/p-i-n structure, photoelectrode device encapsulation, and electrolyte engineering. (II) The design of heterogeneous photocatalytic systems toward the hydrogen evolution reaction (HER) and CO2 reduction reaction, including the light management, surface/interface engineering, stability improvement, product selectivity engineering, and reaction system engineering. (III) The photocatalysts for the environmental application and organic synthesis. Based on the analyses, the review also suggests the prospective research for the future development of halide-perovskite-based photocatalytic systems.

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