Flow zone distribution and mixing time in a Peirce—Smith copper converter

Abstract

Peirce—Smith copper converting involves complex multiphase flow and mixing. In this work, the flow zone distribution and mixing time in a Peirce—Smith copper converter were investigated in a 1:5 scaled cold model. Flow field distribution, including dead, splashing, and strong-loop zones, were measured, and a dimensionless equation was established to determine the correlation of the effects of stirring and mixing energy with an error of <5%. Four positions in the bath, namely, injection, splashing, strong-loop, and dead zones, were selected to add a hollow salt powder tracer and measure the mixing time. Injecting a quartz flux through tuyeres or into the backflow point of the splashing wave through a chute was recommended instead of adding it through a crane hopper from the top of the furnace to improve the slag-making reaction.

Keywords

Peirce—Smith converter / copper smelting / flow fields / mixing time / cold model experiments

References

[1] Liu ZH, Xia LG. The practice of copper matte converting in China. Miner. Process. Extr. Metall., 2018, 128(1–2): 117.

[2] Taskinen P, Akdogan G, Kojo I, Lahtinen M, Jokilaakso A. Matte converting in copper smelting. Miner. Process. Extr. Metall., 2018, 128(1–2): 58.

[3] Y.A. Korol and S.S. Naboychenko, The tuyere in a protective shell to convert the nickel and copper mattes, Non-ferrous Met., 2018, No. 2, p. 3.

[4] Wang JJ, Zhang LF, Cheng G, Ren Q, Ren Y. Dynamic mass variation and multiphase interaction among steel, slag, lining refractory and nonmetallic inclusions: Laboratory experiments and mathematical prediction. Int. J. Miner. Metall. Mater., 2021, 28(8): 1298.

[5] Ma J, Song YP, Zhou P, Cheng W, Chu SG. A mathematical approach to submerged horizontal buoyant jet trajectory and a criterion for jet flow patterns. Exp. Therm. Fluid Sci., 2018, 92, 409.

[6] Vaarno J, Pitkälä J, Ahokainen T, Jokilaakso A. Modelling gas injection of a Peirce—Smith-converter. Appl. Math. Modell., 1998, 22(11): 907.

[7] Hou QF, E DY, Yu AB. Discrete particle modeling of lateral jets into a packed bed and micromechanical analysis of the stability of raceways. AIChE J., 2016, 62(12): 4240.

[8] E DY. Validation of CFD—DEM model for iron ore reduction at particle level and parametric study. Particuology, 2020, 51, 163.

[9] D.Y., E, Numerical investigation of mixed layer effect on permeability in a dynamic blast furnace, Eng. Rep., 2(2020), No. 5, art. No. e12166.

[10] Wang LM, Yin SH, Wu AX. Visualization of flow behavior in ore-segregated packed beds with fine interlayers. Int. J. Miner. Metall. Mater., 2020, 27(7): 900.

[11] G.W. Tang, A.K. Silaen, H.J. Yan, Z.X. Cui, Z. Wang, H.B. Wang, K.L. Tang, P. Zhou, and C.Q. Zhou, CFD study of gas-liquid phase interaction inside a submerged lance smelting furnace for copper smelting, [in] Proceedings of 8th International Symposium on High-Temperature Metallurgical Processing, San Diego, 2017, p. 101.

[12] Chen H, Ma J, Liu HT. Least square spectral collocation method for nonlinear heat transfer in moving porous plate with convective and radiative boundary conditions. Int. J. Therm. Sci., 2018, 132, 335.

[13] Y. Xue, F.N. Dang, Z.Z. Cao, F. Du, F. Liu, J. Ren, and F. Gao, Numerical analysis of heat and gas transfer characteristics during heat injection processes based on a thermo-hydro-mechanical model, Energies, 11(2018), No. 7, art. No. 1722.

[14] Chen Z, Shen HF. Simulation of macrosegregation in a 36-t steel ingot using a multiphase model. Int. J. Miner. Metall. Mater., 2020, 27(2): 200.

[15] Ma DG, Chen WQ, Che XM. Physical modelling of slag splashing in nickel converter. Can. Metall. Q., 2012, 51(1): 31.

[16] Rosales M, Valencia A, Fuentes R. A methodology for controlling slopping in copper converters by using lateral and bottom gas injection. Int. J. Chem. React. Eng., 2009, 7(1): 1.

[17] Valencia A, Rosales M, Paredes R, Leon C, Moyano A. Numerical and experimental investigation of the fluid dynamics in a Teniente type copper converter. Int. Commun. Heat Mass Transf., 2006, 33(3): 302.

[18] Zhao HL, Zhao X, Mu LZ, Zhang LF, Yang LQ. Gas—liquid mass transfer and flow phenomena in a Peirce-Smith converter: A numerical model study. Int. J. Miner. Metall. Mater., 2019, 26(9): 1092.

[19] Chibwe DK, Akdogan G, Eksteen J. Solid—liquid mass transfer in a Peirce—Smith converter: A physical modelling study. Metall. Min. Ind., 2011, 3(5): 202.

[20] Chibwe DK, Akdogan G, Taskinen P, Eksteen JJ. Modelling of fluid flow phenomena in Peirce—Smith copper converters and analysis of combined blowing concept. J. S. Afr. I. Min. Metall., 2015, 115(5): 363.

[21] Almaraz A, López C, Barrón MA, Plascencia G. Numerical and physical modeling of turbulence in a Peirce—Smith copper converter. J. Mater. Sci. Eng., 2013, 3(7): 510.

[22] Wang DX, Liu Y, Zhang ZM, Zhang TA, Li XL. PIV measurements on physical models of bottom blown oxygen copper smelting furnace. Can. Metall. Q., 2017, 56(2): 221.

[23] Fabritius T, Kupari P, Harkki J. Physical modelling of a sidewall-blowing converter. Scand. J. Metall., 2001, 30(2): 57.

[24] Shui L, Cui ZX, Ma XD, Akbar Rhamdhani M, Nguyen A, Zhao BJ. Mixing phenomena in a bottom blown copper smelter: A water model study. Metall. Mate. Trans. B, 2015, 46(3): 1218.

[25] Zhao X, Zhao HL, Zhang LF, Yang LQ. Gas—liquid mass transfer and flow phenomena in the Peirce—Smith converter: A water model study. Int. J. Miner. Metall. Mater., 2018, 25(1): 37.

[26] Chibwe DK, Akdogan G, Aldrich C, Eric RH. CFD modelling of global mixing parameters in a Peirce—Smith converter with comparison to physical modelling. Chem. Prod. Process Model., 2011, 6(1): 22.

[27] Turkoglu H, Farouk B. Mixing time and liquid circulation rate in steelmaking ladles with vertical gas injection. ISIJ Int., 1991, 31(12): 1371.

[28] Zhao HL, Yin P, Zhang LF, Wang S. Water model experiments of multiphase mixing in the top-blown smelting process of copper concentrate. Int. J. Miner. Metall. Mater., 2016, 23(12): 1369.

[29] Ascanio G. Mixing time in stirred vessels: A review of experimental techniques. Chinese J. Chem. Eng., 2015, 23(7): 1065.

[30] Zhao HL, Zhang LF, Yin P, Wang S. Bubble motion and gas-liquid mixing in metallurgical reactor with a top submerged lance. Int. J. Chem. React. Eng., 2017, 15(3): 1.

[31] Shamsuddin M, Sohn H Y. Constitutive topics in physical chemistry of high-temperature nonferrous metallurgy — A review: Part 1. Sulfide roasting and smelting. JOM, 2019, 71(9): 3253.

[32] Bellemans I, De Wilde E, Moelans N, Verbeken K. Metal losses in pyrometallurgical operations — A review. Adv. Colloid. Interface Sci., 2018, 255, 47.

[33] C.P. Culshaw, A.G. Hunt, and M. Nilmani, Injection of silica flux to a nickel converter through a submerged tuyere, [in] Converting, Fire Refining and Casting: Proceedings of a Symposium Sponsored by the Extraction and Processing Division, Prometallurgical Committee, Francisco, 1993, 79.