Sustainable Mining and Metallurgy

As regards a large amount of sludge produced, undesirable processing effect, low product quality and ineffective realization of waste emulsion recycling concerning the current waste emulsion treatment process, the ultra-filtration plus vacuum flashing process is proposed. This paper introduced pretreatment, process and treatment effect of ultra-filtration and vacuum flashing process, discussed the impact of raw material properties, operation pressure and temperature and vacuum degree on the process, and analyzed the per ton cost of handling waste emulsion. It showed that the greater the COD content of waste emulsion, the smaller the effluent flux of ultra-filtration membrane. As the operating pressure increases, the effluent flux increases, until the operating pressure reaches 0.45MPa, the effluent flux no longer increases. In the actual production, the operating temperature should be controlled at 25-45℃, and the vacuum degree should be appropriately increased. The vacuum ultra-filtration and vacuum flashing process for waste emulsion treatment is characterized by the advantages of low disposal cost, free of additional waste and high product quality, and the waste emulsion can be recycled and utilized to prepare fuel oil.