scholarly journals Improving High-Alumina Iron Ores Processing via the Investigation of the Influence of Alumina Concentration and Type on High-Temperature Characteristics

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 802
Author(s):  
Yuxiao Xue ◽  
Jian Pan ◽  
Deqing Zhu ◽  
Zhengqi Guo ◽  
Congcong Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
High Strength ◽  
Free State ◽  
High Alumina ◽  
Iron Ores ◽  
Alumina Concentration ◽  
Temperature Characteristics ◽  
Al2o3 Concentration ◽  
Iron Grade

Aiming at the effective utilization of the abundant high-alumina iron ores with low iron grade, the influence of alumina concentration and type on high-temperature characteristics was clarified based on the analyses of eight typical iron ores. The results indicate that high-temperature characteristics of iron ores in various alumina types are different. Higher Al2O3 concentration is deleterious to assimilability and liquid phase fluidity, but the influence extent of each alumina type is substantially different. Kaolinite (Al2O3·2SiO2·2H2O) contributes to correspondingly better assimilability, followed by hercynite (Fe(Fe, Al)2O4), gibbsite (Al(OH)3), diaspore (AlO(OH)), and free state alumina (Al2O3) in turn. Diaspore promotes relatively higher liquid phase fluidity, followed by kaolinite, free state alumina, and hercynite, while gibbsite possesses the maximum adverse impact. Kaolinite and hercynite are more beneficial to form dendritic or acicular silico-ferrite of calcium and alumina (SFCA) with high strength due to the better reactivity, and gibbsite and diaspore lead to more formation of relatively lower strength lamellar or tabular SFCA, while free state alumina is preferable to form disseminated SCFA with rather poorer strength. Kaolinite and hercynite are the most desirable alumina types for sintering rather than free state alumina.

Research on Ore-Proportioning Optimization Technology in Sintering

2011 ◽  
Vol 117-119 ◽  
pp. 980-983 ◽  
Author(s):  
Xiao Fang Lv ◽  
Hong Liang Han ◽  
Sheng Li Wu
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Liquid Phase ◽  
Size Distribution ◽  
Iron Ore ◽  
Room Temperature ◽  
Temperature Characteristic ◽  
Iron Ores ◽  
Temperature Characteristics ◽  
Bonding Phase

In this paper, self-characteristics (the room-temperature characteristics and the high-temperature characteristic) of iron ores used in sintering, such as chemical composition, size distribution, assimilation, liquid phase fluidity, self-strength of bonding phase, etc, were studied. Then, the principles of ore-proportioning optimization basing on self-characteristics of iron ore during sintering were proposed. Schemes of ore-proportioning optimization were designed and sinter pot test were carried out．Results of sinter pot confirmed the method of optimizing ore proportioning based on iron ore self-characteristics. This work provides good countermeasure for improving sinter quality and reducing sinter cost as soon as possible, under the condition of making full use of the existing iron ore resources.

scholarly journals Effects of microsilica content on microstructure and strength of lightweight castable refractories containing porous corundum-spinel aggregate

2009 ◽  
Vol 41 (3) ◽  
pp. 275-281 ◽  
Author(s):  
W. Yan ◽  
N. Li ◽  
B.Q. Han
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Average Pore Size ◽  
Mercury Porosimetry ◽  
High Strength ◽  
Apparent Porosity ◽  
Liquid Content ◽  
Average Pore ◽  
Crushing Strength ◽  
Liquid Sintering

High-strength, lightweight castable refractories based on spinel were prepared by introducing porous corundum-spinel aggregate and appropriate microsilica. The effects of microsilica content on microstructure and properties of lightweight castable refractories were investigated using SEM, XRD, mercury porosimetry measurements and FactSage thermochemical software. It's found that microsilica was almost dissolved into a liquid phase at high temperature, which promoted liquid sintering. With increasing microsilica content, the matrices became denser and average pore size of matrices increased, then apparent porosity decreased, crushing strength increased and content of liquid phase in castables at 1600?C increased. The appropriate microsilica content is 0.65 to 1.95 wt%, which reaches to a compromise among apparent porosity (33-38%), crushing strength (82-125MPa) and liquid content (1.80~4.97 wt%).

A sintering burden blending model based on one-step optimization method and high-temperature characteristics of iron ore

2019 ◽  
Vol 116 (2) ◽  
pp. 211
Author(s):  
Shengli Wu ◽  
Xiaobo Zhai ◽  
Tiankai Song
Keyword(s):  
High Temperature ◽  
Iron Ore ◽  
Intelligent System ◽  
Quantitative Relationship ◽  
High Strength ◽  
Optimization Method ◽  
Temperature Characteristics ◽  
Positive Effects ◽  
One Step ◽  
The One

A sintering burden blending model is an intelligent system used to obtain the optimal blending proportions of burdens with minimal sintering burden cost. In this study, micro-sintering and sinter pot tests were first carried out to clarify the quantitative relationship between the shatter index (SI) of the sinter and high-temperature characteristics (HTCs) of the ore blends. The result shows that the lowest assimilation temperature (LAT) plays a dual role in SI, whereas the index of liquid phase fluidity (ILF) and compressive strength of the bonding phase (CSB) have positive effects on SI. The effect of the ILF is the largest. Based on the one-step optimization method, suitable ranges of room-temperature characteristics (RTCs) of ore blends, obtained relationship between sinter strength and HTCs of ore blends, sintering theory, and bisection and simplex algorithms, the proposed sintering burden blending model is established. The validation for the model shows that it is effective at utilizing iron ore resources, maintaining high strength of the sinter, while reducing burden costs.

Research on High-Temperature Properties of Typical Iron Ores Used in China and its Blending Optimization

2011 ◽  
Vol 201-203 ◽  
pp. 1780-1786 ◽  
Author(s):  
Sheng Li Wu ◽  
Oliveira Dauter ◽  
Yu Ming Dai ◽  
Jian Xu ◽  
Hong Chen
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Iron Ore ◽  
Experimental Results ◽  
Iron Ores ◽  
High Temperature Properties ◽  
Bonding Phase ◽  
Low Levels

High-temperature properties of 10 samples of iron ore from Brazil, Australia and China were measured. Several conclusions were made based on these experimental results. Assimilability of Brazilian ore, Australian ore and Chinese ore concentrate were low, high and medium, respectively. Optimal fluidity of liquid phase was observed in 2 types of Brazilian ores (BR-B, BR-C), 1 type of Australian ore (AU-C) and 1 type of Chinese ore (CH-D). For self-strength of the bonding phase, Australian ore presented low levels, while Brazilian and Chinese ore presented high levels. According to the experimental results of high-temperature properties of iron ore, schemes of ore blending optimization were designed and sinter pot test using these blends were performed. The results indicated that ore blends composed of 30~45% Brazilian ores + 25~50% Australian ores + 20~30% Chinese concentrates presented excellent sintering results, considering both the performance of the processing and quality of the sinter. Therefore this experiment has proved that ore blending optimization combining high temperature properties can lead to more efficient sintering mixes.

Investigation on High-Temperature Creep Properties of High-Alumina Bauxite

2016 ◽  
Vol 680 ◽  
pp. 347-351
Author(s):  
Shuo Cao ◽  
Yong Li ◽  
Jia Lin Sun ◽  
Hao Bo Zhang ◽  
Yong Qiang Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Creep Rate ◽  
Creep Resistance ◽  
Creep Property ◽  
High Alumina ◽  
High Temperature Creep ◽  
Creep Properties ◽  
Temperature Creep ◽  
Heat Preservation

This paper studied the high temperature creep properties of high-alumina bauxite (the mass fraction of Al2O3 in the new ore is about 78, the following abbreviations for Al2O3~78). The results indicated that the Al2O3~78 high-alumina bauxite mainly are corundum phase after high temperature sintered.When the temperature is 1100°C, corundum exists as crystal phase and the connections between grains are directly. The creep resistance of samples is very good at this temperature and the creep rate of 50 hours heat preservation is-0.266%. When the temperature is 1200°C, liquid phase starts to produce in a large number and the creep rate in 50 hours heat preservation is-1.589%. When the temperature is 1300°C, because of the further increase on the amount of liquid phase and wetting coated corundum particle, the direct connections between corundum particles are broken and the creep resistance is greatly reduced, the creep rate in 50 hours heat preservation is-4.088%. The creep curve fitting after 25 hours indicated that the creep property shows linear relations in three different temperatures after 25 hours. When the temperature is 1200°C and 1300°C, the creep variables arise rapidly in linear which declare the creep resistance of corundum is poor and increasing with temperature go up, more corundum phase is covered by glass phase and the creep resistance reduces dramatically.

INFLUENCE OF FORCED CONVECTION IN LIQUID INSIDE THE TIN ON DURATION OF STERILIZATION IN THE COURSE OF FISH PROCESSING

2017 ◽  
pp. 137-144
Author(s):  
Gennadiy Valentinovich Alexeev ◽  
Elena Igorevna Verboloz
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Forced Convection ◽  
Thermal Process ◽  
Processing Time ◽  
Fish Processing ◽  
Study Results ◽  
Equipment Modernization ◽  
Bottom To Top

The article focuses on the process of intensive mixing of liquid phase in the tin during high-temperature sterilization, i.e. sterilization when temperature of the heat carrier reaches 150-160°C. It has been stated that for intensification of the thermal process during sterilization of tinned fish with liquid filling it is preferable to turn a tin from bottom to top. This operation helps to increase the driving power of the process and to shorten warming time. Besides, high-temperature sterilization carried out according to experimental modes, where the number of tin turnovers is calculated, greatly shortens processing time and improves quality of the product. In this case there is no superheating, all tins are evenly heated. The study results will contribute to equipment modernization and to preserving valuable food qualities.

PYROTOOL A

Alloy Digest ◽  
1971 ◽  
Vol 20 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Good Ductility ◽  
Extrusion Dies ◽  
Temperature Performance

Abstract PYROTOOL A has been designed to display high strength and good ductility at temperatures up to 1200 F. It is used for high-temperature tooling, extrusion dies, liners, dummy blocks, forging dies, mandrels, holders, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Fe-47. Producer or source: Carpenter.

INCONEL ALLOY 722

Alloy Digest ◽  
1965 ◽  
Vol 14 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Base Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Age Hardening ◽  
Nickel Base Alloy ◽  
Inconel Alloy ◽  
Temperature Performance ◽  
Nickel Base

Abstract INCONEL Alloy 722, formerly Inconel W alloy, is a high strength, high-temperature nickel-base alloy responding to age hardening heat treatments for maximum properties. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-100. Producer or source: Huntington Alloy Products Division, An INCO Company.

BERYLCO NICKEL ALLOY 440

Alloy Digest ◽  
1975 ◽  
Vol 24 (9) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Nickel Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Electronic Components ◽  
High Temperature Mechanical Properties ◽  
Temperature Performance ◽  
Solution Treated ◽  
Complex Shapes

Abstract BERYLCO NICKEL ALLOY 440 is an age-hardenable nickel-beryllium-titanium alloy that offers high strength, excellent spring properties outstanding formability, good high-temperature mechanical properties, and resistance to corrosion and fatigue. Complex shapes can be produced in the solution-treated (soft) condition and then aged to a minimum tensile strength of 215,500 psi. It is used for mechanical and electrical/electronic components in the temperature range -320 to 800 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-94. Producer or source: Kawecki Berylco Industries Inc.. Originally published September 1964, revised September 1975.

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