Production method for regenerated and mixed lubricant oil of waste oil in nitrogen fertilizer enterprise

The invention relates to a production method for regenerated and mixed lubricant oil of waste oil in a nitrogen fertilizer enterprise, and relates to a regeneration method for lubricant oil. The production method comprises the step of obtaining low-grade regenerated base oil by using alkali salt pre-treatment and a clay normal-pressure and low-temperature refining process. The production method for the regenerated and mixed lubricant oil of waste oil in the nitrogen fertilizer enterprise is characterized by comprising the following steps of: stirring the low-grade regenerated base oil and heating to 100 DEG C, slowly adding T-903 type anti-foaming agent (methyl silicone ester polymer) in a weight ratio of 0.01-0.02% with the low-grade regenerated base oil at first, stirring for 5 minutes and then slowly adding DL-32 H type demulsifying agent (oil-soluble polyether high-molecular compound) in a weight ratio of 0.04-0.05% with the low-grade regenerated base oil, stirring for 5 minutes and then slowly adding T37