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.

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.

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.

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.

Determination method of high-temperature characteristics of iron-ore sintering based on n(Fe2O3)/n(CaO)

2019 ◽  
Vol 26 (12) ◽  
pp. 1257-1264
Author(s):  
Zheng-wei Yu ◽  
Li-xin Qian ◽  
Hong-ming Long ◽  
Yi-fan Wang ◽  
Qing-min Meng ◽  
...  
Keyword(s):  
High Temperature ◽  
Iron Ore ◽  
Determination Method ◽  
Temperature Characteristics ◽  
Iron Ore Sintering ◽  
Ore Sintering

Research on Influence Law of Fuel Structure for Low-FeO Sintering

2011 ◽  
Vol 201-203 ◽  
pp. 1802-1805
Author(s):  
Miao Lian Bian ◽  
Sheng Li Wu ◽  
Qing Feng Wang
Keyword(s):  
Liquid Phase ◽  
Solid Fuel ◽  
Iron Ore ◽  
Experimental Results ◽  
Coke Breeze ◽  
Partial Substitution ◽  
Liquid Volume ◽  
Sintering Process ◽  
Bonding Phase ◽  
Sintering Condition

Micro–sintering equipment was applied to simulate sintering process of iron ore. FeO content of sinter-samples under different fuel structures was measured, and then the effect of fuel structure on fluidity of liquid phase and strength of bonding phase were analyzed in this paper. The proper fuel structure was finally discussed under low FeO sintering condition. The results show that: when anthracite was adopted as partial substitution of coke breeze as part of solid fuel, FeO of sinter reduces and self-strength of bonding phase increases. Although fluidity of liquid phase reduces, the fluidity index it is still above 0.8, which can meet the liquid volume needed for sintering. When CDQ powder is used as part of solid fuel, FeO of sinter also reduces, but fluidity of liquid phase and self-strength of bonding phase reduce a little due to its low combustibility. Taking experimental results and practical production together into account, it can be concluded that proper fuel structure that meets low FeO sintering should be “70% coke+30% anthracite”.

scholarly journals Influence of iron ore concentrate on the characteristics of sintering and reduction of sinter

2020 ◽  
pp. 24-24
Author(s):  
H. Guo ◽  
F.-M. Shen ◽  
X. Jiang ◽  
D.-W. Xiang ◽  
H.-Y. Zheng
Keyword(s):  
Liquid Phase ◽  
Calcium Silicate ◽  
Iron Ore ◽  
Raw Materials ◽  
Mineral Resources ◽  
Integral Form ◽  
Sio2 Content ◽  
Calcium Ferrite ◽  
Iron Ore Sintering ◽  
Bonding Phase

As the main iron ore importing country for China, the abundant mineral resources of Australian are the primary raw materials for the sintering production. To better understand the properties of different iron ore from Australia and then guide the sintering production, this study selected four types ore from Australian and one type ore from domestic, and their properties were investigated under different condition. The experiment of single iron ore sintering was studied to examine the influence of different iron ore on metallurgical properties of sinter. From this study, the following results were obtained: GG showed poor fluidity and higher assimilability temperature, but the bonding phase strength was the highest; YD showed better fluidity and lower assimilability temperature, whereas SJY (domestic ore) showed better fluidity and higher bonding phase strength, lower assimilability temperature. The influence mechanism of iron ore on the fluidity was further analyzed by using SEM and ion theory of slag. With the increase SiO2 content of iron ore, the fluidity index increased, the main reason was that the amount of liquid phase increased and melting point decreased during sintering. However, an excessive amount of SiO2 caused the decrease of fluidity index of iron ore, the main reason was that the fluidity of the liquid phase itself decreased and secondary hematite appeared. In the case of the SiO2 content of iron ore was higher, the main bonding phase was calcium silicate. With the decrease of SiO2 content, the calcium silicate transformed into calcium ferrite. This main reason was that the Gibbs free energy of calcium ferrite and dicalcium ferrite (2CaO?SiO2) was higher than that of calcium silicate in the temperature ranges of 400-1600 K. The reduction degree of YD was the highest in all the cases and that of GG was the lowest. Activation energies of 5.39, 3.14, 3.51, 4.47 and 2.92 kJ/mol were obtained for the reduction of GG, PB, BH, SJY, and YD, respectively. In all the cases, the reaction corresponded to the model function of F1(?), and the integral form was -ln(1-?)=kt. Through this investigation, it could be concluded that the most appropriate ore category for sinter pot was YD.

The Oxidizing Roasting and Reducing Melting of Titaniferous and Conversion Iron Ores

2017 ◽  
Vol 371 ◽  
pp. 117-120 ◽  
Author(s):  
Andrey N. Dmitriev ◽  
G.Yu. Vitkina ◽  
R.V. Petukhov ◽  
L.A. Ovchinnikova
Keyword(s):  
Chemical Composition ◽  
Phase Analysis ◽  
Iron Ore ◽  
Raw Materials ◽  
Pig Iron ◽  
Iron Ores ◽  
X Ray Diffraction ◽  
X Ray ◽  
Melting Temperatures ◽  
Conversion Iron

The chemical composition of pellets of various basicity from pig iron ore materials is described. The metallurgical characteristics (reducibility, strength, softening and melting temperatures) is analyzed. The micro X-ray diffraction phase analysis is made. Also the sinter of various basicity from titaniferous raw materials is investigated.

scholarly journals Analysis of indices and operation improvement conditions of JSC “Ural Steel” blast furnace shop

2018 ◽  
pp. 46-54
Author(s):  
D. R. Ganin ◽  
V. G. Druzhkov ◽  
A. A. Panychev ◽  
A. Yu. Fuks
Keyword(s):  
Grain Size ◽  
Blast Furnace ◽  
Chemical Composition ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Iron Ore ◽  
Fine Fraction ◽  
Production Operation ◽  
Blast Furnaces ◽  
Furnace Technology

For elaborating of measures to improve the blast furnace technology, it is necessary to analyze production data related to blast furnaces operation. Estimation of technical level of blast furnace production in conditions of JSC “Ural Steel” was the aim of the study. Data on chemical composition of casted iron produced and burden materials quoted, as well as data on iron ore materials consumption, sinter grain-size distribution, pellets chemical composition and strength characteristics, coke mechanical strength and grain-size distribution. Results of analysis presented of production operation indices of Nos 1–4 blast furnaces within a five years period, the furnaces having net volumes 1007, 1033, 1513 and 2002 m3 correspondently. Periods of non-stable furnaces operation with long stops and repairs were excluded from the analyzed data. It was determined that iron and manganese oxide contents in the sinter are presented at lower level comparing with most of sintering plants of European Communities and Japan. Fine fraction less 5 mm content is considerably higher than the index for sinter, produced at other sintering plants of Russia, as well as of developed nations. Laboratory study and experimental-industrial tests at JSC “Ural Steel” confirm reasonability of the following mineral additives utilization in sintering process, delivered into the sintering burden by sludge: brown iron ore, bentonite clay, serpentinite-magnesites, that enables to increase suitable sinter yield, productivity of sintering machines, sinter impact strength. A necessity to optimize blast furnace slags chemical composition by relation SiO2/Al2O3 and CaO/MgO determined to improve scull formation conditions and elimination of coolers mass burning-through. To improve the technical and economic indices of JSC “Ural Steel blast furnaces operation some measures on the plant blast furnace technology modification proposed.

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