New technique of comprehensive utilization of spent Al₂O₃-based catalyst

Abstract

A new technology was developed to recover multiple valuable elements from the spent Al₂O₃-based catalyst by X-ray phase analysis and exploratory experiments. The experimental results show that in the condition of roasting temperature of 750 °C and roasting time of 30 min, molar ratio of Na₂O to Al₂O₃ of 1.2, the leaching rates of alumina, vanadium and molybdenum in the spent catalyst are 97.2%, 95.8% and 98.9%, respectively. Vanadium and molybdenum in sodium aluminate solution can be recovered by precipitators A and B, and the precipitation rates of vanadium and molybdenum are 94.8% and 92.6%. Al(OH)₃ was prepared from sodium aluminate solution in the carbonation decomposition process, and the purity of Al₂O₃ is 99.9% after calcination, the recovery of alumina reaches 90.6% in the whole process; the Ni-Co concentrate was leached by sulfuric acid, a nickel recovery of 98.2% and cobalt recovery over 98.5% can be obtained under the experimental condition of 30% H₂SO₄, 80°C, reaction time 4 h, mass ratio of liquid to solid 8, stirring rate 800 r/min.

Keywords

spent Al₂O₃-based catalyst / vanadium / molybdenum / comprehensive utilization / roasting with sodium / leaching rate

References

[1] AnonL. Refining catalyst demand[J]. Oil and Gas Journal, 2000, 98(41): 64-66

[2] RapaportD. Are spent hydrocracking catalysts listed hazardous wastes? [J]. Hydrocarbon Processing, 2000, 79(7): 49-53

[3] ChangT. Reclamation and landfill processes are alternatives to regeneration[J]. Oil and Gas Journal, 1998, 96(42): 79-84

[4] TrimmD L. The regeneration or disposal of deactivated heterogeneous catalysts[J]. Applied Catalysis A: General, 2001, 212(1): 153-160

[5] MarafiM, StanislausA. Options and processes for spent catalyst handling and utilization[J]. Journal of Hazardous Materials, 2003, 101(2): 123-132

[6] LIU Huan-qun. Recovering of spent catalyst in the foreign country[J]. Chinese Resource Comprehensive Utilization, 2000(12): 35–37. (in Chinese)

[7] Toukai K T, Katsuta K K, Toubai H S, et al. Process for recovering valuable metal from waste catalyst. US, 5431892[P]. 1995 - 07 -11.

[8] Veal J T, Andersen K A, Kowaleski R M. Process to recover metals from spent catalyst. US, 6180072 B1 [P]. 2001 - 01 - 30.

[9] YooJ S. Metal recovery and rejuvenation of metalloaded spent catalysts[J]. Catalysis Today, 1998, 44(1): 27-46

[10] MansiA, MonemA. Recovery of nickel oxide from spent catalyst[J]. Waste Management, 2002, 22: 85-90

[11] ChmielewskiA G, UrbanskiT S, MigdalW. Separation technologies for metals recovery from industrial wastes[J]. Hydrometallurgy, 1997, 45(3): 333-344

[12] InoueK, ZhangP, TsuyamaH. Separation and recovery of rare metals from spent hydrodesulfurization catalysts by solvent extraction[C]. Third International Symposium on Recycling of Metals and Engineered Materials, 1995, Pennsylvania, Minerals, Metals and Materials Society: 393-404

[13] FurimskyE. Spent refinery catalysts: environment, safety and utilization[J]. Catalysis Today, 1996, 30(4): 223-236

[14] LuoL, MiyazakiT, ShibayamaA, et al.. A novel process for recovery of tungsten and vanadium from a leach solution of tungsten alloy scrap[J]. Minerals Engineering, 2003, 16(7): 665-670

[15] RadchenkoE D, NefedovB R, AlievR RCatalyst of crude oil deep processing[M], 1998, Beijing, Chinese Petrochemical Industry Press(in Chinese)

[16] SoldenhoffK, HaywardN, WilkinsD. Direct solvent extraction of cobalt and nickel from laterite-acid pressure leach liquors[C]. EPD Congress, 1998, Pennsylvania, Minerals, Metals and Materials Society: 153-165

[17] ChengC H. Purification of synthetic laterite leach solution by solvent extraction using D2EHPA [J]. Hydrometallurgy, 2000, 56(3): 369-386

[18] TsakiridisP E, AgatziniS L. Process for the recovery of cobalt and nickel in the presence of magnesium and calcium from sulphate solutions by Versatic 10 and Cyanex 272[J]. Minerals Engineering, 2004, 17(4): 535-543