Abstract:Steel oily sludge is a kind of hazardous waste (HW08) produced in the steel rolling process, and its resource utilization is difficult. The separation and treatment of oily sludge by alkali washing method was studied, and the separated iron components were prepared into composite nanocatalysts. The study for alkali elution of oil shows that when the temperature is 80 ℃, the mass ratio of alkali solution/oily sludge is 1∶2, the alkali concentration is 15%, and the reaction time is 1 h, the deoiling rate of oily sludge can reach 94.14%, and the solid phase with iron mass fraction of 62.49% is obtained. The iron containing solid phase after deoiling was treated by coprecipitation method to obtain magnetic nano Fe3O4 with particle size of about 8 nm. The composite nanocatalyst was prepared by solvothermal method with diatomite and applied to the catalytic degradation of Rhodamine B, the degradation rate reached 99.53%. This method realizes the harmless treatment and resource utilization of oily sludge.
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FAN Xiao-hui, WU Kai-jia, GAN Min, TANG Qing-yu, SUN Zeng-qing, JI Zhi-yun. Efficient separation of iron-containing components from oily sludge and preparation of composite nanocatalysts[J]. China Metallurgy, 2022, 32(10): 129-135.
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