Sustainable Mining and Metallurgy

A large amount of waste mineral oil is produced in industrial production, which has high use value. The traditional waste mineral oil regeneration processes includes distillation-acidic-white clay process, distillation-hydrogenation process and distillation-solvent rectification process. These processes have the disadvantages of poor product quality, poor production continuity and being easy to generate large quantity of secondary hazardous waste. In this paper, based on the traditional processes, the process of Rectification under vacuum+Centrifugal extraction+Solvent refining was adopted to handle the waste mineral oil. After being treated by such processes as pre-treatment, normal pressure dewatering, centrifugal extraction, solvent refining, product refining, etc., the base oil product can be obtained to realize the resource recovery of waste mineral oil. Moreover, the impact of extractant use amount, operating temperature of rectification under vacuum and reflux ratio on the process recovery, product quality and economic results was also analyzed. In production, appropriate solvent-oil ratio, operating temperature and reflux ratio should be selected.