| Oil sand, like oil and coal is a kind of non-metallic mineral resources and a valuable material for refinery and road construction. Under the background of world energy crisis, oil sands is regarded as a good alternative energy sources of crude oil with its significant reserve. Meanwhile, the development of oil sands processing technologies has drawn much researcher’s attention. The commercial hot-water process is trapped by water consumption and tailing ponds issues, as well as the solvent residual in the organic solvent extraction process.Based on the facts above, we figured out the process, in which the naphtha was used to extract bitumen from oil sands amended with CPAM aqueous solution, were reliable and practical. After the optimization, the bitumen recovery increased from 72.29% to 78.29 while the ratio of naphtha to 0.05% CPAM aqueous solution to oil sands was 3:2:1 at room temperature. In addition, CPAM demonstrated the ability to reduce clay/fines entrainment both in bitumen and naphtha systems.Considering the differences led by additives, the bitumen liberation experiments were conducted in relevant system. The results showed that the speed bitumen liberated was slower in 1mM IL aqueous solution than those in pure water and classical salty system. Combined with the AFM and SFG experiments, we tried to build the structure model of additives molecular on silica and bitumen surface, especially in pure IL and CPAM aqueous solution systems. In other way around, the structure model offered some possible explanation over the experimental phenomena.Finally, the adhesion force between bitumen and silica in CPAM aqueous solution was found to be around 4 n N, which is notably smaller than that in pure water and classical salty system. This result gave an explanation over the role of CPAM in bitumen recovery enhancement and clay/fines entrainment reduction. |
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