Abstract：Based on the national requirements of green metallurgy, aiming at recycling zinc and K, Na elements in zinc-bearing electric furnace dust efficiently and pollution-freely, water leaching pretreatment was adopt to recover K and Na elements in dust, and vacuum carbothermic reduction was adopt to recover zinc. The experimental results show that the optimal solution for water leaching is solid-liquid ratio of 1∶10 (g/ml), stirring speed of 300 r/min and water leaching time of 70 min. Under this condition, the leaching rates of K and Na are 91.09% and 85.68%, respectively. FactSage 8.0 software was used to simulate the thermodynamic behavior of vacuum carbothermic reduction furnace dust under different carbon distribution conditions. Combined with the preliminary exploration test, the results show that vacuum carbothermic reduction experiment can effectively separate Fe and Zn elements under the conditions of 10% coke added into water leaching slag, reduction temperature of 950 ℃ and holding time of 60 min. The metal zinc ingot (Zn mass fraction is 98.15%) and high quality iron concentrate (Fe mass fraction is 61.93%) are obtained.
de Araújo José Alencastro, Schalch Valdir. Recycling of electric arc furnace (EAF) dust for use in steel making process[J]. Journal of Materials Research and Technology, 2014, 3(3): 274.
[6]
Chairaksa-Fujimoto R, Maruyama K, Miki T, et al. The selective alkaline leaching of zinc oxide from electric arc furnace dust pre-treated with calcium oxide[J]. Hydrometallurgy, 2016, 159: 120.
YU G, PENG N, ZHOU L, et al. Selective reduction process of zinc ferrite and its application in treatment of zinc leaching residues[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(8): 2744.
Buitrago L J H, Prada I D, Buitrago Amaral-Labat G, et al. Microstructural, thermochemistry and mechanical evaluation of self-reducing pellets using electric arc furnace (EAF) dust containing zinc for Waelz process[J]. Matéria, 2018, 23(2):e-12006.
WANG Jie, ZHANG Ying-yi, CUI Kun-kun, et al. Pyrometallurgical recovery of zinc and valuable metals from electric arc furnace dust-A review[J]. Journal of Cleaner Production, 2021, 298: 126788.
LI J, MA H. Zinc and lead recovery from jarosite residues produced in zinc hydrometallurgy by vacuum reduction and distillation[J]. Green Processing and Synthesis, 2017, 7(6): 552.
[19]
HUANG R, LIU P S, YUE Y H, et al. Vacuum carbothermic reduction of panzhihua ilmenite concentrate: A thermodynamic study[J]. Mineral Processing and Extractive Metallurgy Review, 2017, 38(3): 193.
[20]
HUANG R, LIU P S, QIAN X, et al. Comprehensive utilization of panzhihua ilmenite concentrate by vacuum carbothermic reduction[J]. Vacuum, 2016, 134: 20.
[21]
HUANG R, LIU P S, ZHANG J Z, et al. Effects of temperature on vacuum carbothermic reduction of panzhihua ilmenite concentrate[J]. Metallurgist, 2017, 61(5/6): 511.
Jena S K, Sahu J, Padhy G, et al. Chlorination roasting-coupled water leaching process for potash recovery from waste mica scrap using dry marble sludge powder and sodium chloride[J]. International Journal of Minerals, Metallurgy and Materials,2020,27(9):1203.
2022, Vol. 32 
