Acid pellets exhibited highest reduction degradation due to the presence of more hematite bonds and less silicate bonds. In limestone fluxed pellets, reduction degradation index …

Optimized use of limestone–dolomite (1:1) improved the physical and metallurgical properties of the fluxed pellets. Abstract Owing to the depletion of high …

In limestone-fluxed pellets with bentonite as a binder, although formation of calcium ferrite was noted at the basicity of 0.8, its formation in appreciable quantities was delayed until the basicity of 1.6. For the pellets produced with a combination of dolomite and limestone, even at the basicity of 1.6, only minor amounts of this phase were ...

Fluxed pellets containing 10% and 20% limestone were produced in a laboratory balling drum. It was found that the pelletization kinetics were sensitive to the water content of the pellets.

Guo, Y. et al. Effect of basicity on the reduction swelling behavior and mechanism of limestone fluxed iron ore pellets. Powder Technol. 393, 291–300 (2021). Article CAS Google Scholar

@article{Wang2022DegradationMO, title={Degradation mechanism of high alumina refractory bricks by reaction with deposits in a rotary kiln for fluxed iron ore pellets production}, author={Shuai Wang and Yu-Feng Guo and Jian-jun Fan and F. Chen and Zhuang Yang and Yajing Liu and Lingzhi Yang}, journal={Ceramics International}, …

The CS of high MgO fluxed pellets didn't change significantly when basicity increased from 0.6 to 1.0, on the other hand the CS increased from 2800 N to 3500 N with the basicity increasing from 1.0 to 1.3. Figure 3 displays the effect of the basicity on the porosity of the fluxed pellets. The porosity was gradually decreasing with increasing ...

In the case of the production of fluxed pellets, preliminary (prior to dosing) flux components, for example, limestone, also undergo preparation. Limestone with a particle size of 0–80 mm is crushed to a particle size of 0–25 mm and then is pulverized (with simultaneous drying); size of crushed limestone 90–95% fraction—0.05 mm.

The iron and steel manufacturing sector directly accounts for 7–9% of global CO2 emissions. Raw material preparation, such as iron ore sintering, pelletizing, and cock making, is the major CO2 emitter. As climate change becomes a bigger concern, steel manufacturers need to lower CO2 emissions without hindering efficiency or increasing …

Limestone fluxed pellets are highly porous and therefore very reducible but physically weaker than non-fluxed ones. The CCS distribution (see Fig. 13) is broad and the standard deviation is high for both pellet grades; therefore, the average CCS value alone is not a proper indicator of the mechanical properties of the pellets.

Limestone fluxed iron ore pellets are reduced in CO-rich atmosphere generally accompanied by swelling behavior. If the reduction swelling index (RSI) exceeds the normal range (≥20%), it will ...

In limestone fluxed pellets, reduction degradation index dropped considerably with increasing CaO content due to the formation of more amount of bonding phase. Dolomite–pyroxenite pellets, on the other hand, showed lower reduction degradation index up to 0.4 basicity, and beyond that, higher degradation was observed due to the …

Limestone fluxed pellets were prepared at varying basicity (0 to 0.8) and pyroxenite fluxed pellets at varying MgO contents (0 to 3%) to study their effect on the metallurgical properties. Fired pellets were tested for their strength, RDI, reducibility and swelling. Microstructural studies, optical and SEM-EDS were carried out to quantify ...

Olivine, limestone, and dolomite can be added to pellet as the raw materials to obtain olivine pellets, dolomite pellets, and mixed fluxed-type pellets, improving …

Both test pellets were produced in a laboratory-scale pelletizing drum and fired in sample baskets set in the middle of the sintering belt on the same production line as commercial blast furnace pellets. One set of pellets was fluxed slightly with limestone (CaCO 3) and was labelled "non-fluxed", while the other one was highly limestone ...

Effect of basicity on the reduction swelling behavior and mechanism of limestone fluxed iron ore pellets. Powder Technol., 393 (2021), pp. 291-300. View PDF View article View in Scopus Google Scholar [3] X. Wang, Y. Jin. Strategy analysis and testing study of high ratio of pellet utilized in blast furnace.

The formed deposits wear out of refractory wall linings in the rotary kiln and may cause production disturbances. This study describes the chemical composition and mineralogical phase components at the deposit/refractory interface in the rotary kiln for fluxed iron ore pellets production. The main phases of refractory bricks are corundum …

differences in pelletization behaviors between the limestone fluxed pellets and hydrated lime fluxed pellets with basicity of 0.45–0.95 were investigated and the related mechanisms were clarified in this paper. 2. Materials and Methods 2.1. Materials The raw materials which were used for preparing the green pellets are as follows: hematite ...

For the purpose of producing high-quality fluxed pellets, many studies have indicated that additives have prominent effect on the pellet properties [10,11,12,13]. ... and the particle size fractions of limestone and magnesia less than 74 µm were 92.97% and 96.37%, respectively.

Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore | Semantic Scholar. DOI: 10.1016/j.powtec.2020.10.063. Corpus ID: 226333476. Effect of …

Limestone fluxed pellets were prepared at varying basicity (0 to 0.8) and pyroxenite fluxed pellets at varying MgO contents (0 to 3%) to study their effect on the metallurgical properties. Fired pellets were tested for their strength, RDI, reducibility and swelling. Microstructural studies, optical and SEM-EDS were carried out to quantify ...

Limestone fluxed pellets. Table 7 shows the chemical analysis of limestone fluxed fired pellets with varying basicity. Conclusions. The following conclusions can be drawn from this work: 1. In the limestone fluxed pellets, with increasing basicity the amount of silicate melt, which acts a bonding phase, found to increase in the fired pellets.

Q.J. Gao et al., Gas-solid reduction kinetic model of MgO-fluxed pellets 13 2. Experimental 2.1. Raw materials For the purpose of improving the quality of oxidized pel-lets and meeting the request for MgO content in BF slag, MgO-fluxed pellets have been widely applied recently. Generally, the MgO content of MgO-fluxed pellets is about 2.0wt%-2 ...

@article{Wang2022CharacterizationAC, title={Characterization and comparison of deposits in a coal-fired rotary kiln for iron ore fluxed pellets and acidic pellets productions}, author={Shuai Wang and Yu-Feng Guo and Jianjun Fan and Zhuang Yang and F. Chen and Lingzhi Yang and Yajing Liu}, journal={Powder Technology}, …

Deposit formation in the coal-fired rotary kiln is frequently found in the production of fluxed iron ore pellets by the grate-kiln process and affects normal production. In this paper, the effects of pellet basicity (CaO/SiO2 mass ratio) on the simulated deposit formation were investigated. The results show that the porosity of deposits samples increases from 30.8 …

Received: 26 May 2023 ; Revised: 25 August 2023 ; Accepted: 8 September 2023; Available online: 9 September 2023. Abstract. The increase to the proportion of …

Limestone fluxed pellets at 0.8 basicity, pyroxenite fluxed pellets at 1.5% MgO and magnesite fluxed pellets at 1.0% MgO exhibited low swelling behavior among all the pellets studied.

In order to produce high-quality pellets with good reducibility and superior softening and melting properties, certain additives are important. One of the most common fluxing materials for iron ore pellet production is limestone, which is mainly calcium oxide (CaO). In this study, the effect of adding limestone on the metallurgical properties (reducibility, …

Optimized use of limestone–dolomite (1:1) improved the physical and metallurgical properties of the fluxed pellets. Abstract Owing to the depletion of high-grade iron ore quality, many steel plants over the world are now using pellets after beneficiation of low grade ores as blast furnace feed.