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.

scholarly journals Iron-Ore Sintering Process Optimization / Optymalizacja Procesu Aglomeracji Rudy Żelaza

2015 ◽  
Vol 60 (4) ◽  
pp. 2895-2900 ◽  
Author(s):  
M. Fröhlichová ◽  
D. Ivanišin ◽  
A. Mašlejová ◽  
R. Findorák ◽  
J. Legemza
Keyword(s):  
Iron Content ◽  
Iron Ore ◽  
Raw Materials ◽  
Size Composition ◽  
Sintering Process ◽  
Iron Ore Sintering ◽  
Iron Ore Sinter ◽  
A Charge ◽  
Iron Ore Concentrate

The work deals with examination of the influence of the ratio between iron ore concentrate and iron ore on quality of produced iron ore sinter. One of the possibilities to increase iron content in sinter is the modification of raw materials ratio, when iron ore materials are added into sintering mixture. If the ratio is in favor of iron ore sinter, iron content in resulting sintering mixture will be lower. If the ratio is in favor of iron ore concentrate and recycled materials, which is more finegrained, a proportion of a fraction under 0.5 mm will increase, charge permeability property will be reduced, sintering band performance will decrease and an occurrence of solid particulate matter in product of sintering process will rise. The sintering mixture permeability can be optimized by increase of fuel content in charge or increase of sinter charge moisture. A change in ratio between concentrate and iron ore has been experimentally studied. An influence of sintering mixture grain size composition, a charge grains shape on quality and phase composition on quality of the produced iron sinter has been studied.

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”.

Investigation of a granule structure that focused on reducing NOx emissions in sintering process

2019 ◽  
Vol 116 (3) ◽  
pp. 315
Author(s):  
Junmao Qie ◽  
Chunxia Zhang ◽  
Haifeng Wang ◽  
Yuhua Guo ◽  
Shengli Wu
Keyword(s):  
Iron Ore ◽  
Calcium Ferrite ◽  
Emissions Reduction ◽  
Test Results ◽  
Sintering Process ◽  
Sinter Quality ◽  
Iron Ore Sintering ◽  
Granule Structure ◽  
Iron Ore Sintering Process ◽  
Ore Sintering

The pressure to reduce NOx emissions in iron ore sintering process is enlarging increasingly. The paper proposed a sintering granulation method to reduce NOx emissions. The main character of the method was to wrap all fuel on the surface of the pellet, and also increased the contact between iron ore and fluxes. The sinter-pot test results showed that NOx emissions of the method reduced by 19.9% and sinter quality improved, while SO2 emissions increased by 17.7% compared with that of the conventional method. The increase in the reducing atmosphere of the sinter bed and the development of calcium ferrite in sinter were the main causes of NOx emissions reduction and the improvement of the sinter quality. In addition, the promotion of the combustion of fuel resulted in the increase in SO2 emissions. The improvement of the sinter quality and the control of the sintering flue gas pollutants can also be realized through adjusting the distribution of fuel, fluxes and iron ore in the pellet reasonably.

Calcium ferrite formation characteristic during iron ore sintering with different oxygen atmospheres

2014 ◽  
Vol 21 (8) ◽  
pp. 3043-3048 ◽  
Author(s):  
Xiao-ming Mao ◽  
Zhi-xiong You ◽  
Yuan-bo Zhang ◽  
Zhen-yu Fan ◽  
Guang-hui Li ◽  
...  
Keyword(s):  
Iron Ore ◽  
Calcium Ferrite ◽  
Ferrite Formation ◽  
Iron Ore Sintering ◽  
Ore Sintering

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.

I.—Recent Iron-ore Developments in the United Kingdom

1919 ◽  
Vol 6 (9) ◽  
pp. 387-397 ◽  
Author(s):  
F. H. Hatch
Keyword(s):  
United Kingdom ◽  
Iron Ore ◽  
Raw Materials ◽  
Mineral Resources ◽  
Industrial Growth ◽  
The United Kingdom

Whilst the basis of the prosperity of a country is admittedly agriculture, its industrial growth is founded on mineral resources, and its participation in the world's markets is chiefly dependent on the extent to which these raw materials can be applied to home manufactures.

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 The Mechanism of the Effect of Al2O3 Content on the Liquid Phase Fluidity of Iron Ore Fines

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 931 ◽  
Author(s):  
Heping Li ◽  
Shengli Wu ◽  
Zhibin Hong ◽  
Weili Zhang ◽  
Heng Zhou ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Mineral Composition ◽  
Phase Formation ◽  
Iron Ore ◽  
Al2o3 Content ◽  
Calcium Ferrite ◽  
Sintering Process ◽  
Liquidity Index ◽  
Iron Ore Fines

The sintering process is significantly important for the ironmaking in China because of the large amount of sinter consumed. Al2O3 is an important element determining the quality and quantity of sinter. However, different conclusions have been made regarding the effects of Al2O3 on the amount and fluidity of the liquid phase formed in the sinter phase. Therefore, it is necessary to examine the effects of Al2O3 content on the amount and fluidity of the liquid phase. The present work investigated the effects of different Al2O3 contents of iron ore fines on the liquid phase formation, mineral composition, and consolidation strength. The results showed that a small amount of Al2O3 increased the amount of calcium ferrite, making the liquid phase formation easier. As the Al2O3 content in iron ore fines increased, the liquidity index decreased continuously, while the fluidity and the consolidation strength of the sintered body were directly related to the content squared. The quality of the sinter is optimal when the Al2O3 content of the iron ore fines is about 2 wt % (the SiO2 content is 4 wt %).

Characteristics of PM 2.5 from iron ore sintering process: Influences of raw materials and controlling methods

2017 ◽  
Vol 148 ◽  
pp. 12-22 ◽  
Author(s):  
Zhiyun Ji ◽  
Min Gan ◽  
Xiaohui Fan ◽  
Xuling Chen ◽  
Qiang Li ◽  
...  
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Sintering Process ◽  
Pm 2.5 ◽  
Iron Ore Sintering ◽  
Iron Ore Sintering Process ◽  
Ore Sintering
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