Direct reduction simulation of iron-bearing dust in thick-layer rotary hearth furnace
XU Jian-xiang1, QI Feng-sheng1, LI Bao-kuan1, YAN Ding-liu2
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. State Key Laboratory for Advanced Iron and Steel Process and Products, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：The rotary hearth furnace process is one of the most effective processes for the treatment of iron-bearing dust, but the traditional rotary hearth furnace process requires the formation of pellets and can only lay 1-2 layers of pellets, so the production efficiency is low. In response to this problem, the new thick layer rotary bottom furnace technology was emerged, which was 10-30 times the thickness of traditional process, and the pellet-making and combustion device were not needed, it could greatly improve the production efficiency. Based on the computational fluid dynamics (CFD) method, a new mathematical model of heterogeneous reaction direct reduction of porous media in thick layer rotary bottom furnace was established to study the working characteristics of thick-layer rotary hearth furnace, and the reducing atmosphere, dezincification and metallization rate in the thick-layer rotary hearth furnace were analyzed and discussed. The results showed that the dezincting rate of thick layer rotary bottom furnace material was more than 99% and the metallization rate was more than 90%, which could effectively improve the production efficiency. The results could enrich the theory of rotary hearth furnace process for thick-layer rotary hearth furnace engineering and provide the theoretical basis.
El-Hussiny N A,Shalabi M E H.A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process[J].Powder Technology,2011,205(1/2/3):217.
Suetens T,Klaasen B,Van Acker K,et al.Comparison of electric arc furnace dust treatment technologies using exergy efficiency[J].Journal of Cleaner Production,2014,65:152.
[12]
Laforest G,Duchesne J.Characterization and leachability of electric arc furnace dust made from remelting of stainless steel[J].Journal of Hazardous Materials,2006,135(1/2/3):156.
Leclerc N,Meux E,Lecuire J M.Hydrometallurgical recovery of zinc and lead from electric arc furnace dust using mononitrilotriacetate anion and hexahydrated ferric chloride[J].Journal of Hazardous Materials,2002,91(1/2/3):257.
[15]
Dutra A J B,Paiva P R P,Tavares L M.Alkaline leaching of zinc from electric arc furnace steel dust[J].Minerals Engineering,2006,19(5):478.
[16]
Menad N,Ayala J N,Garcia-Carcedo F,et al.Study of the presence of fluorine in the recycled fractions during carbothermal treatment of EAF dust[J].Waste Management,2003,23(6):483.
[17]
Turan M D,Altundogˇan H S,Tümen F.Recovery of zinc and lead from zinc plant residue[J].Hydrometallurgy,2004,75(1/2/3/4):169.
[18]
Oda H,Ibaraki T,Abe Y.Dust recycling system by the rotary hearth furnace[J].Shinnittetsu Giho,2006,384:134.
[19]
王飞,毛瑞,茅沈栋.转底炉对转炉污泥的处理[J].钢铁,2019,54(12):111.
[20]
WU Yu-liang,JIANG Ze-yi,ZHANG Xin-xin,et al.Numerical simulation of the direct reduction of pellets in a rotary hearth furnace for zinc-containing metallurgical dust treatment[J].International Journal of Minerals Metallurgy and Materials,2013,20(7): 636.
[21]
Meissner S,Kobayashi I,Tanigaki Y,et al.Reduction and melting model of carbon composite ore pellets[J].Ironmaking & Steelmaking,2003,30(2):170.
2021, Vol. 31 
