48 行 The reasons behind this reduction behavior are the following: 1) the lump ore is
2015-1-6 Recently a special attention is paid on the utilization of ultra-fine iron ore (-0.2 mm) in the form of micro-or mini-pellets in the sintering process. In the current study the
2020-1-30 atures (700, 800, 900, and 1000 C) for iron ore pellets, sinter, and lump ore are shown in Figure 3. It is shown that the lump ore has the slowest reduction rate at each
Image analysis of samples revealed that the crack length density showed the similar trend to RDI value. CO gas reduction mainly proceeds near the surface of sinter particles, while H
2015-8-17 In this work, iron ore reduction by the gaseous products of methane partial oxidation in a porous media (H 2 and CO) is studied numerically and experimentally. A
2018-1-19 When the reduction of iron ore sinter is controlled by gas diffusion, the reducibility of the sinter will be improved with higher porosity , especially higher content
2022-8-22 The reduction of wustite to iron was carried out at 1000, 900, and 800°C in a CO—CO 2 —H 2 atmosphere for the mineral morphology-controlled sinter, and the
Reduction with hydrogen, in the best case produced via renewable energies, is a future-minded alternative to commonly used fossil fuels. Direct reduction processes, which reduce iron ore to metallic iron without any liquid
Abstract The reduction kinetics tests of Shougang sintering iron ores were performed from 1173 to 1373 K with 100% CO by thermogravimetric analysis, from which the values of reduction reaction apparent activation energy were determined.
The kinetics of the smelting reduction of iron ore by a graphite crucible and carbon-saturated molten iron was investigated between 1400 °C and 1550 °C, and its reaction phenomena were continuously 10 Importance of Melt Generation and Properties in Iron Ore Sintering Dongmei Liu, C. E. Loo Materials Science 2016
Reduction by CO gas led to the formation of magnetite phases with not only thick and long but also fine cracks near the surface. In contrast, H2reduction did not lead to formation of a significant number of fine cracks. Image analysis of samples revealed that the crack length density showed the similar trend to RDI value.
2021-12-17 Effect of FeO concentration in sinter iron ore on reduction behavior in a hydrogen-enriched blast furnace Ko-ichiro Ohno 1) , , Takayuki Maeda 1) , Kazuya Kunitomo 1) , and Masashi Hara 2)...
2022-8-22 This project aimed to establish novel technologies to reduce CO2 emissions with partially utilization of hydrogen in blast furnace-based ironmaking by 30% by around 2030 and use it for practical applications by 2050. The idea is that instead of coke, hydrogen is used as the reducing agent, leading to lower fossil fuel consumption in the process.
The reduction of industrial iron ore sinter has been carried out using a laboratory system as shown in Fig. 1. The sys- tem consisted of vertical tube Tammann furnace connected with an automatic sensitive balance. Alumina reaction tube was fitted inside the graphite heating tube where the heat transferred mainly by radiation to the sinter samples.
2021-1-10 Reduction disintegration mechanism of iron ore sinter. Reduction of CO 2 emission is recognized as an urgent issue in the iron and steel industry. One feasible method may be the utilization of H 2 gas as a reducing agent in blast furnace (BF) ironmaking. In order to keep the BF condition stable under high H 2 operation, it is
Whereas the production of sponge iron from iron ore pellets is already commercially applied, the direct H 2 reduction of crude iron ore powder has the advantages of omitting the sintering stage that is the major energy consumer and CO 2 emission source of the iron-making process, together with the blast furnace.
2018-10-23 Reduction of iron ores The reduction process is the process of reducing iron oxides to iron by carbon monoxide resulting from coke in the blast furnace or by a mixture of carbon monoxide and hydrogen gases
Decreasing the air volume after the over-wetting layer disappears (2nd stage) is beneficial to increase the sinter strength. When the air volume is redistributed to the air volume of 1st stage accounting for 74.59% and the air volume of 2nd stage accounting for 25.41%, the productivity coefficient increases from 1.34 t/(m 2 h) to 1.46 t/(m 2 h) with an increase
2022-11-28 Using sinter in place of lump ore and pellets helps to reduce blast furnace fuel rate and CO 2 emissions. Adding fluxed sinter feed to the blast furnace increases softening and melting temperature and improves
the reduction rate was analyzed by using ucs model for three interfaces with the pre-determined rate parameter values; the comparison between the experimental reduction curve and the computed one showed rough agreement but not so precise and this discrepancy was considered by the existence of quaternary calcium ferrite (abbreviated
The quality requirements of iron ore for direct reduction are well known and will not be detailed here, but are in essence: Fe content as high as possible: minimum 66%, ideally > 67% acid gangue (SiO 2 + Al 2 O 3) content as low as
Under reducing atmosphere conditions, the reduction of iron oxide in sinter is closely related to the gasification reaction of coke. Based on a simulation experiment, the transition point from chemical reactions to diffusion and the related kinetic parameters were determined through a sectioning method.
2013-7-18 High temperature properties were determined from the results of X-ray observations, reduction rate profile and the gasification rate. The results obtained indicated that the reduction of sinter started at 823 K, then at >1073 K and the reduction rate increased due to the interaction between the carbon gasification and gaseous reduction
2017-8-25 the burden structure. High-basicity sinter jointed with acid pellets has always been regarded as one of the most effective burden structures for a long term [1−2]. This structure has the advantages of fine metallurgical property of high-basicity sinter and the superiority of acid pellets with high iron grade, good reducibility, high
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