(1. School of Materials Science and Chemical Engineering, Tianjin University of Science and Technology, Tianjin 300222;

2. Fine Chemical Plant of Daqing Oilfield Chemical Co., Ltd., Daqing, Heilongjiang 1634 1 1)

Waste gear lubricating oil was treated by sulfuric acid refining-alkali neutralization-activated clay adsorption-filtration process. The pickling temperature is 40℃, and the dosage of 98% concentrated sulfuric acid is 6% (mass fraction) of waste oil; The neutralization temperature of alkali is 80℃, and the neutralizer is 10% sodium hydroxide; Adsorption conditions: the dosage of activated clay is 15% (mass fraction), the temperature is 150℃, and the time is1h; ; The viscosity of regenerated lubricating oil at 40℃ is 128 Mpa? S, 80℃ is 19.2 MPa? S, the condensation point is -33℃. At the same time, waste alkali is used to treat acid residue, and cationic flocculant is used to treat wastewater.