Kinetic model research on drying characteristics of artificial magnetite green pellet

Abstract

In this study, the effects of drying temperature, hot airflow speed and diameter of green pellet on drying rate of artificial magnetite pellet were deeply investigated to clarify the drying characteristics of artificial magnetite green pellet. The results show that the drying process of artificial magnetite green pellet has three stages, accelerated drying stage, constant drying stage and decelerated drying stage. And drying temperature and hot airflow speed both have significant reciprocal effects on moisture ratio and drying rate of green pellet during the drying process. However, the diameter of green pellet has little effect on drying process of green pellet. Then the drying fitting models of Correction Henderson and Pabis, Lewis, Correction Page (III), Wang and Singh are used to describe the drying kinetics of artificial magnetite green pellet. The fitting results indicate that the drying process of artificial magnetite pellet can be described by Correction Page (III) model accurately. Finally, the contrast experiments demonstrate that the fitting model can well describe the actual drying process.

Keywords

magnetic roasting / artificial magnetite / pellet / drying rate / drying kinetics

References

[1] ZhouY-l, KawatraS K. Pelletization using humic substance-based binder [J]. Mineral Processing and Extractive Metallurgy Review, 2017, 38(2): 83-91

[2] PalJ, GhoraiS, NandiB, ChakrabortyT, DasG, VenugopalanT. Effect of pyroxenite and olivine minerals as source of MgO in hematite pellet on improvement of metallurgical properties [J]. Journal of Central South University, 2015, 22(9): 3302-3310

[3] CopelandC R, clarembouxV, KawatraS K. A comparison of pellet quality from straight-grate and grate-kiln furnaces [J]. Mineral Processing and Extractive Metallurgy Review, 2018, 40(3): 218-223

[4] LongH-m, WangH-t, DiZ-x, ChunT-j, LiuZ-G. Influences of hydrogen-enriched atmosphere under coke oven gas injection on reduction swelling behaviors of oxidized pellet [J]. Journal of Central South University, 2016, 23(8): 1890-1898

[5] de MoraesS L, RibeiroT R. Brazilian iron ore and production of pellet [J]. Mineral Processing and Extractive Metallurgy Review, 2019, 40(1): 16-23

[6] ZhangH-q, LuM-m, FuJ-tao. Oxidation and roasting characteristics of artificial magnetite pellet [J]. Journal of Central South University, 2016, 23(11): 2999-3005

[7] LuoL-q, HuangH, YuY-fu. Characterization and technology of fast reducing roasting for fine iron materials [J]. Journal of Central South University, 2012, 19(8): 2272-2278

[8] ZhangY-b, DuM-h, LiuB-B, SuZ-j, LiG-h, JiangT. Separation and recovery of iron and manganese from high-iron manganese oxide ores by reduction roasting and magnetic separation technique [J]. Separation Science and Technology, 2017, 52(7): 1321-1332

[9] JangK O, nunnaR M, hapugodaS, NguyenA V, bruckardW J. Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation [J]. Minerals Engineering, 2014, 60: 14-22

[10] GuoH-w, BaiJ-l, ZhangJ-l, LiH-ge. Mechanism of strength improvement of magnetite pellet by adding boron-bearing iron concentrate [J]. Journal of Iron and Steel Research, International, 2014, 21: 9-15

[11] LuoL-q, ZhangH-quan. Process mineralogy and characteristic associations of iron and phosphorous-based minerals on oolitic hematite [J]. Journal of Central South University, 2017, 24(9): 1959-1967

[12] YangC-c, ZhuD-q, PanJ, ZhouB-z, XunH. Oxidation and induration characteristics of pellet made from western Australian ultrafine magnetite concentrates and its utilization strategy [J]. Journal of Iron and Steel Research, International, 2016, 23: 924-932

[13] HaltJ A, kawatraS K. Iron ore pellet dustiness part II: Effects of firing route and abrasion resistance on fines and dust generation [J]. Mineral Processing and Extractive Metallurgy Review, 2015, 36(5): 340-347

[14] RajshekarY, PalJ, VenugopalanT. Mill scale as a potential additive to improve the quality of hematite ore pellet [J]. Mineral Processing and Extractive Metallurgy Review, 2018, 39(3): 202-210

[15] FanX-h, YangG-m, ChenX-l, HeX-n, HuangX-x, GuoL. Effect of carboxymethyl cellulose on the drying dynamics and thermal cracking performance of iron ore green pellets [J]. Powder Technology, 2014, 267: 11-17

[16] ZhangY-b, LuM-m, ZhouY-l, SuZ-j, LiuB-B, LiG-h, JiangT. Interfacial interaction between humic acid and vanadium, titanium-bearing magnetite (VTM) particles [J]. Mineral Processing and Extractive Metallurgy Review, 2020, 41(2): 75-84

[17] RamachandranR P, bourassaJ, PaliwalJ, CenkowskiS. Effect of temperature and velocity of superheated steam on initial condensation of distillers’ spent grain pellets during drying [J]. Drying Technology, 2017, 35(2): 182-192

[18] AthaydeM, CotaM, CovcevichM. Iron ore pellet drying assisted by microwave: A kinetic evaluation [J]. Mineral Processing and Extractive Metallurgy Review, 2018, 39(4): 266-275

[19] LjungA L, lundströmT S, marjavaaraB D, tanoK. Influence of air humidity on drying of individual iron ore pellets [J]. Drying Technology, 2011, 29(9): 1101-1111

[20] LjungA L, frishfeldsV, LundströmT S, marjavaaraB D. Discrete and continuous modeling of heat and mass transport in drying of a bed of iron ore pellets [J]. Drying Technology, 2012, 30(7): 760-773

[21] ErgünK, CaliskanG, DirimS N. Determination of the drying and rehydration kinetics of freeze dried kiwi (Actinidia deliciosa) slices [J]. Heat and Mass Transfer, 2016, 52(12): 2697-2705

[22] LewisW K. The rate of drying of solid materials [J]. The Journal of Industrial and Engineering Chemistry, 1921, 5: 427-432

[23] DanishM, JingH, PinZ, ZiyangL, PanshengQ. A new drying kinetic model for sewage sludge drying in presence of CaO and NaClO [J]. Applied Thermal Engineering, 2016, 106: 141-152

[24] BabalisS J, papanicolaouE, KyriakisN, BelessiotisV G. Evaluation of thin-layer drying models for describing drying kinetics of FIGS (Ficus carica) [J]. Journal of Food Engineering, 2006, 75(2): 205-214