CO-EXTRACTION PROCESS OF OIL SLUDGE AND TAILINGS TO RECOVER OIL

Abstract

Abstract: The mineral composition, morphology and particle size distribution of Liaohe scum oil sludge and Yumen tailing oil sands were characterized by XRD, SEM and standard size sieve. A new co-extraction process for mixture of oil sludge and tailings was proposed for oil recovery efficiently base on the different properties of sludge and tailings. The results indicated that the tailings are mainly composed of quartz and calcium carbonate with high crystallinity and the size of more than 95% particle is larger than 75 μm, while oil sludge mainly contains clay minerals with soft texture and 89.7% of particles with size less than 75 μm. The effects of tailings/oil sludge mass ratio, solvent/(oil sludge+tailings sample) mass ratio, extraction temperature and time on the oil recovery were investigated. The results showed that under the optimal operation conditions: 60℃ and contact time 20 min, tailings/oil sludge=0.5, solvent/sample=2, the oil recovery by one stage co-extraction is 81.8% and the total oil recovery by two stage co-extraction can be as high as 89.4%. It is concluded that the oil recovery from oil sludge can be improved by co-extraction of tailings and oil sludge.

Key words: scum oil sludge, tailings, particle size, mineral composition, co-extraction

Kuan-Yong LUO yun donghan. CO-EXTRACTION PROCESS OF OIL SLUDGE AND TAILINGS TO RECOVER OIL[J]. , 2017, 48(10): 66-70.

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