High value-added utilization approach of pyrolysis products generated by tank bottom oily sludge
YANG Huifen1,,, LI Zhen1, FU Peng1, SONG Zhenguo2, YANG Hang2, MA Wenkai1 1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2.State Key Laboratory of Mineral Processing Science and Technology, Beijing 102628, China
Abstract:In order to discuss the high value-added utilization approach of the pyrolysis products, generated by tank bottom oily sludge, the properties of pyrolysis products were carefully analyzed by GC-MS, XRF, XRD and SEM-EDS techniques. On this basis, the adsorption removal experiments of three typical anions Cr(Ⅵ), $ {\rm{PO}}_4^{3 - }$ and F? and three typical cations Cd2+, Pb2+ and Cu2+ were carried out. The results showed the alkane content of the oils received by pyrolysis of tank bottom oily sludge was as high as 50.91%, and the carbon number was mainly distributed between n-C12 and n-C30, which was similar to the carbon number of the raw material for the preparation of mineral flotation agent. The structural framework of the pyrolysis residue with a loose porous structure was composed of elements C, S, Fe, Ca, Al, Si, O, etc., and the crystal minerals such as FeS, Fe1?xS, Fe7S8, CaS, CaAl2Si2O8 and the amorphous phase forms were embedded in it. And the pyrolysis residue in water could act as reducing agent, sulfide precipitator and calcium salt precipitator. It was found that pyrolysis residue was of the high removal efficiency on those anions and cations in water. When the dosage of pyrolysis residue was 3, 10, 12, 1, 0.8 and 0.8 g·L?1, the removal efficiencies of Cr(Ⅵ), $ {\rm{PO}}_4^{3 - }$, F?, Cd2+, Pb2+ and Cu2+ reached 99.6%, 98.9%, 96.8%, 99.3%, 98.9% and 99.4%, respectively. XRD analysis revealed that the removal of those pollution ions was achieved by precipitation of FeCr2O4, Ca3(PO4)2, CaF2, CdS, Cd(OH)2, CdAl2Si2O8, PbS, Pb(OH)2, PbAl2Si2O8, CuS, Cu(OH)2, CuAl2Si2O8 on the surface of pyrolysis residue. The experimental results provided a reference for the high value-added utilization of pyrolysis products, especially pyrolysis residue. Key words:tank bottom oily sludge/ oils/ pyrolysis residue/ pollution anions/ pollution cations/ adsorption material.
图1罐底油泥热解装置示意图 Figure1.Schematic diagram of pyrolysis device for tank bottom oily sludge
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1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2.State Key Laboratory of Mineral Processing Science and Technology, Beijing 102628, China Received Date: 2020-03-21 Accepted Date: 2020-10-22 Available Online: 2021-02-22 Keywords:tank bottom oily sludge/ oils/ pyrolysis residue/ pollution anions/ pollution cations/ adsorption material Abstract:In order to discuss the high value-added utilization approach of the pyrolysis products, generated by tank bottom oily sludge, the properties of pyrolysis products were carefully analyzed by GC-MS, XRF, XRD and SEM-EDS techniques. On this basis, the adsorption removal experiments of three typical anions Cr(Ⅵ), $ {\rm{PO}}_4^{3 - }$ and F? and three typical cations Cd2+, Pb2+ and Cu2+ were carried out. The results showed the alkane content of the oils received by pyrolysis of tank bottom oily sludge was as high as 50.91%, and the carbon number was mainly distributed between n-C12 and n-C30, which was similar to the carbon number of the raw material for the preparation of mineral flotation agent. The structural framework of the pyrolysis residue with a loose porous structure was composed of elements C, S, Fe, Ca, Al, Si, O, etc., and the crystal minerals such as FeS, Fe1?xS, Fe7S8, CaS, CaAl2Si2O8 and the amorphous phase forms were embedded in it. And the pyrolysis residue in water could act as reducing agent, sulfide precipitator and calcium salt precipitator. It was found that pyrolysis residue was of the high removal efficiency on those anions and cations in water. When the dosage of pyrolysis residue was 3, 10, 12, 1, 0.8 and 0.8 g·L?1, the removal efficiencies of Cr(Ⅵ), $ {\rm{PO}}_4^{3 - }$, F?, Cd2+, Pb2+ and Cu2+ reached 99.6%, 98.9%, 96.8%, 99.3%, 98.9% and 99.4%, respectively. XRD analysis revealed that the removal of those pollution ions was achieved by precipitation of FeCr2O4, Ca3(PO4)2, CaF2, CdS, Cd(OH)2, CdAl2Si2O8, PbS, Pb(OH)2, PbAl2Si2O8, CuS, Cu(OH)2, CuAl2Si2O8 on the surface of pyrolysis residue. The experimental results provided a reference for the high value-added utilization of pyrolysis products, especially pyrolysis residue.