High Temperature Interaction between Sinter and Lump Ores/Pellet in Cohesive Zone of Blast Furnace

2015 ◽  
pp. 683-689
Author(s):  
Xinliang Liu ◽  
Shengli Wu ◽  
Wei Huang ◽  
Jinming Zhu
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Cohesive Zone ◽  
Temperature Interaction

Melting Features and Viscosity of TiO2-Containing Primary Slag in a Blast Furnace

2018 ◽  
Vol 37 (2) ◽  
pp. 149-156 ◽  
Author(s):  
Kexin Jiao ◽  
Jianliang Zhang ◽  
Zhiyu Wang ◽  
Yanxiang Liu ◽  
RenZe Xu
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Low Temperature ◽  
Cohesive Zone ◽  
Solid Phase ◽  
Slag System ◽  
Silicate Network ◽  
Network Modifier ◽  
Blast Furnace Ironmaking ◽  
Ironmaking Process

AbstractThe performance of the primary slag in the cohesive zone of blast furnace is critical for smooth operation of blast furnace ironmaking process. In the present work, the CaO–SiO2–MgO–TiO2–Al2O3–FeO slag system was studied to identify the influence of the FeO and the TiO2 on the melting features and viscosity. The temperatures of melting features are found to decrease with increasing FeO from 5 wt% to 20 wt% and increase with increasing TiO2 from 5 wt% to 15 wt%. The viscosities of the slag change with TiO2 can be divided into four periods, which are slow period, rapid period, slow down period and dramatically rise period. The introduction of TiO2 into silicate network performs as network modifier at high temperature and network former at a relative low temperature. FeO can decrease the effect of Ti2O64– chain units and decrease the precipitation temperature of the solid phase.

Kinetics and mechanisms of coke and sinter on the coupling reaction to evaluate the integrated effects of coke solution loss reaction on blast furnace processes

2021 ◽  
Vol 118 (5) ◽  
pp. 506
Author(s):  
Jin Jin ◽  
Qi Wang ◽  
Song Zhang
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Constant Temperature ◽  
Cohesive Zone ◽  
Reaction Rate ◽  
Coupling Reaction ◽  
High Reactivity ◽  
Thermal Strength ◽  
Industrial Grade ◽  
Rate Controlling Step

The gas–solid coupling reaction kinetics at a constant temperature at each temperature point in the high-temperature cohesive zone in a blast furnace environment were simulated using industrial blast furnace raw material sinter, the low-reactivity conventional coke, and the high-reactivity unconventional coke. In this method, the coupling test of the sinter and coke at constant temperature was performed after a supporting thermogravimetric device was used to carry out pre-reduction, and the coupling reaction of industrial-grade sinter and coke were used to obtain the kinetic data and a mathematical description of the reaction mechanism. The results showed that in the high-temperature cohesive zone, the gasification reaction rate of the low-reactivity coke is the rate-controlling step of the gas–solid coupling reaction rate between the sinter and the conventional low-reactivity coke. By contrast, the rate-controlling step of the gas–solid coupling reaction rate between the sinter and highly-reactive coke is the reduction of sinter. The maximum difference between the initial reaction temperatures of the two kinds of coke samples is 30 °C. Using the same testing standard as coke strength after the reaction (CSR) to test the thermal strength of coke after the coupling reaction, it was found that there is little difference between the thermal strengths (CSRp) of the two kinds of coke after the reaction. The thermal strength of the high-reactivity coke is the worst at 1100 °C, and that of coke with low reactivity is the worst at 1200 °C. The highly reactive coke can operate smoothly in the blast furnace of the cohesive zone and this is explained from the perspective of kinetics. This knowledge provides guidance for the evaluation of the capability of coke to resist solution loss.

A review of high-temperature experimental techniques used to investigate the cohesive zone of the ironmaking blast furnace

2018 ◽  
Vol 46 (10) ◽  
pp. 953-967 ◽  
Author(s):  
Xinliang Liu ◽  
Tom Honeyands ◽  
Geoffrey Evans ◽  
Paul Zulli ◽  
Damien O’Dea
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Cohesive Zone ◽  
Experimental Techniques

scholarly journals Effect of Ternary Basicity of Iron Ore-Fluxed Pellets on Melting and Softening Properties in a Blast Furnace

2020 ◽  
Author(s):  
Fábio R. Silva ◽  
Leandro R. Lemos ◽  
Paulo de Freitas Nogueira ◽  
Marcelo Bressan
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Chemical Composition ◽  
Cohesive Zone ◽  
Iron Ore ◽  
Elevated Temperatures ◽  
Softening Temperature ◽  
Reduction Degree ◽  
High Temperature Properties ◽  
The Impact

Abstract The cohesive zone is a region of low permeability in a blast furnace. This study shows the impact of the chemical composition of pellets on the metallurgical processes occurring in this region during the iron ore reduction process. Sixteen pellets containing varying contents of MgO, CaO, and SiO2 were investigated. The results indicate that increasing the MgO content of pellets improves their high-temperature properties; e.g., reduction degree and softening temperature. Modern equipment was used to replicate the phenomena that occur in the cohesive zone to measure the softening temperature, pressure drop, and the reduction degree of pellets at elevated temperatures and different pellet basicities. These experimental results were used to develop mathematical correlations between parameters related to high-temperature properties and the ternary basicity of the pellets ((CaO + MgO)/SiO2). Defining such relationships will facilitate evaluating the effects of pellet chemical composition on blast furnace processes.

scholarly journals High temperature interaction between Si–B alloys and Si3N4

2021 ◽  
Author(s):  
Jian Meng Jiao ◽  
Kai Tang ◽  
Jafar Safarian ◽  
Bettina Grorud ◽  
Kathrine Sellevoll ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Interaction
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