Preparation of Magnetic Flocculant from Acid-Leached Steel Slag and Its Application in Oilfield Wastewater Treatment
In this contribution,the steelworks waste underwent acid leaching to be hydrolyzed and polymerized into a magnetic flocculant,thereby achieving resource recycling.X-ray diffraction analysis revealed that the received flocculant primarily consisted of γ-Fe2O3.Furthermore,infrared spectroscopy and Zeta potential char-acterizations indicated that it was an inorganic polymer flocculant,with the main flocculation mechanism being ad-sorption and electric neutralization.It was found that the maturation time had a significant impact on the transforma-tion of iron ion.The product obtained after 5 days of maturation exhibited the highest Fe(b)content,signifying the most effective coagulation component and optimal coagulation effect.Application experiments conducted on the pro-duced liquid of Sulige gas field from Changqing oilfield demonstrated that the coagulant was effective within a pH range of 7～11,with an optimal dosage of 0.3～0.4 g/L.Under these conditions,the turbidity removal rate excee-ded 99％,and the COD removal rate surpassed 64％.In comparison to the commonly used PAC in the market,this coagulant boasted several outstanding features,including a faster sedimentation rate and a smaller volume of settled flocs,indicating its extensive range of application prospects.
magnetic flocculantresource reusesettling performanceoilfield wastewater
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