Study of sulphide zinc concentrates oxidation kinetics in the fluidized bed furnace
DOI:
https://doi.org/10.14529/power170304Keywords:
zinc concentrate, charge, reaction velocity constant, gas generation, fluidized bed, reaction penetration depth, specific reaction surfaceAbstract
In order to optimize the operation of the fluidized bed furnace for annealing sulphide zinc concentrates,
in particular, to save oxygen for blowing, it is necessary to model thermal processes. For this purpose, the oxidation kinetics of the charge and its basic components – zinc and iron sulfides – was studied under laboratory conditions. The experiments were carried out with the simultaneous thermal analysis tool NETZSCH STA 449 F3; they showed that oxidation reactions of zinc and iron sulfides with oxygen proceed in the intrakinetic region.
At the sample weight of 10 mg, the thickness of the reactant layer is less than the penetration depth of oxygen into the layer. Therefore, the expression for the change of a single particle mass can be used. It allowed one to obtain the empirical dependence for determining the reaction velocity constant during zinc concentrate annealing for further calculation of the gas generation in the fluidized bed.
The authors also obtained the distribution of the oxygen concentration along the height of the charge layer and calculated the average value of the effective oxygen concentration as a function of the reactant layer thickness.
The gas generation analysis in the fluidized bed during zinc concentrate annealing with the use of the obtained constants of chemical reaction velocities allowed one to obtain the formula to determine the specific consumption of the annealed zinc concentrate depending on the oxygen concentration in blowing.
References
Naboychenko S.S. (Ed.), Ageev N.G., Karelov S.V., Mamyachenkov C.V., Sergeev V.A. Protsessy i apparaty tsvetnoy metallurgii: uchebnik [Processes and Apparatuses of Non-Ferrous Metallurgy: Tutorial]. Ekaterinburg, Izdatelstvo Uralskogo universiteta Publ., 2013. 564 p.
Marchenko N.V., Vershinina E.P., Gildenbrandt E.M. Metallurgiya tyazhelykh tsvetnykh metallov [Metallurgy of Heavy Non-Ferrous Metals]. Krasnoyarsk, IPK SFU Publ., 2009. 394 p.
Simultaneous Thermal Analysis (Thermogravimetry and DSC). NETZSCH-Gerätebau GmbH. Available at: https://www.netzsch-thermal-analysis.com/ru/produkty-reshenija/sinkhronnyi-termicheskii-analiz/ (accessed 01.06.2017).
Munts V.A., Ivakina S.A. [Using Coal Burning Regularities for Description of Zinc Concentrates Annealing in Fluidized Bed]. IX Vserossiyskaya konferentsiya s mezhdunarodnym uchastiem “Gorenie topliva: teoriya, eksperiment, prilozheniya” [IX All-Russian Conference with International Participation “Fuel Burning: Theory, Experiment, Applications”]. Novosibirsk, 16–18 November 2015. (in Russ.)
Novitskiy P.V., Zograf I.A. Otsenka pogreshnostey rezul'tatov izmereniy [Assessment of Uncertainites of Measuring Results]. Leningrad, Energoatomizdat Publ., 1991. 304 p.
Munts V.A., Ivakina S.A., Terentev V.M. [Gas Generation During Zinc Concentrate Annealing]. Tsvetnye Metally [Non-Ferrous Metals]. 2017, no. 2, pp. 40–45 (in Russ.) DOI: 10.17580/tsm.2017.02.06
Munts V.A., Ivakina S.A. [Determination of Kinetic Characteristics of Zinc Sulfide Oxidation]. Mezhdunarodnyy soyuz uchenykh “Nauka. Tekhnologii. Proizvodstvo” [International Union of Scientists “Science. Technologies. Production”]. 2015, no. 3 (7), part 2, pp. 34–37. (in Russ.)
Panshin A.M., Kozlov P.A., Terentev V.M. [Kinetics of Oxidation of Sulfide Zinc Concentrates]. Tsvetnye Metally [Non-Ferrous Metals]. 2014, no. 2, pp. 34–37. (in Russ.)
Heukelman, S, Groot D. Fluidized Bed Roasting of Micro-pelletized Zinc Concentrate: Part II – Particle Entrainment and Residence Time. Journal of the Southern African Institute of Mining and Metallurgy, 2011, vol. 111, pp. 767–772.
Savinova, Y.A., Popov V.A., Portov A.B., Tsemekhman L.S. Roasting of a Sulfide Polymetallic Concentrate in a Fluidized Bed Furnace. Russian Metallurgy (Metally), 2014, vol. 2014, pp. 351–357. DOI: 10.1134/S0036029514050115
Maffei, T., Khatami R., Pierucci S., Faravelli T., Ranzi E., Levendis Y.A. Experimental and Modeling Study of Single Coal Particle Combustion in O2/N2 and Oxy-fuel (O2/CO2) Atmospheres. Combustion and Flame, 2013, vol. 160, pp. 2559–2572. DOI: 10.1016/j.combustflame.2013.06.002
Prins, W. Fluidised Bed Combustion of a Single Carbon Particle. The Netherlands, Quick Service Drukkerij Enschede, 1987. 258 p.
Parveen, F., Briens C., Berruti F., McMillan J. Effect of Particle Size, Liquid Content and Location
on the Stability of Agglomerates in a Fluidized Bed. Powder Technology, 2013, vol. 237, pp. 376–385. DOI: 10.1016/j.powtec.2012.12.021
Kantorovich B.V. Osnovy teorii goreniya i gazifikatsii tverdogo topliva [Basis of Theory of Burning and Gasification of Solid Fuel]. Moscow, Izdatelstvo AN SSSR Publ., 1958. 598 p.
Feng, B., Jensen A., Bhatia S.K., Dam-Johansen K. Activation Energy Distribution of Thermal Annealing of a Bituminous Coal. Energy and Fuels, 2003, vol. 17(2), pp. 399–404. DOI: 10.1021/ef020108v
Miura, K., Maki T. A Simple Method for Estimating f(E) and k0(E) in the Distributed Activation Energy Model. Energy and Fuels, 1998, vol. 12, pp. 864–869. DOI: 10.1021/ef970212q
Babiy V.I., Kuvaev Yu.F. Gorenie ugol'noy pyli i raschet pyleugol'nogo fakela [Combustion of Coal Dust and Calculation of Pulverized Coal Flare]. Moscow, Energoatomizdat Publ., 1986. 208 p.
Khitrin, L.N. Fizika goreniya i vzryva [Physics of Combustion and Explosion]. Moscow, Izdatel'stvo Moskovskogo universiteta Publ., 1957. 452 p.
Liu, G.-W., Dong P., Han Y.-F., Bie R.-S. Experimental Study on Combustion Characteristics of Coals under Enriched-Oxygen Condition by Thermo-Gravimetric Analysis. Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology, 2011, vol. 43, pp. 104–108.
Fan, S.Y., Qiu Z., Gao J.B. Experimental Research of Rich Oxygen Content on Improving Combustion Characteristics of Pulverized Coal. Journal of Xi’an Jiaotong University, 2006, vol. 40, no.1, pp. 18–21.
Constantineau, J.P., Bouffard S.C., Grace J.R., Richards G.G., Lim C.J. Demonstration of the Conditions Conducive to Agglomeration of Zinc Calcine in Fluidized Bed Roasters. Minerals Engineering, 2011, vol. 24, pp. 1409–1420. DOI: 10.1016/j.mineng.2011.06.002
Munts V.A., Baskakov A.P., Ashikhmin A.A. [Gas Generation Calculations During Solid Fuel Burning in Fluidized Bed]. Inzhenerno-fizicheskiy zhurnal [Engineering and Physical Journal]. 1988, vol. 54, no. 3,
pp. 432–438. (in Russ.)
Khzmalyan, D.M. Teoriya topochnykh protsessov [Theory of Furnace Processes]. Moscow, Energo-atomizdat Publ., 1990. 352 p.
Zhang, L., Li J., Hu Q., Hu C., Li H. Control of Mean Residence Time Difference for Particles with Wide Size Distribution in Fluidized Beds. Powder Technology, 2017, vol. 312, pp. 270–276. DOI: 10.1016/j.powtec.2017.02.052
