The environment impact of de-oiling and re-activation process of spent clay from oil industry was evaluated. The process includes many technical steps; de-oiling the entrained spent clay using solvent extraction techniques; solvent recovery process; re-activation process wherein the oil-free spent clay is treated with acid; and thermal polishing step at high temperature to increase the activity. Many solvents were used for de-oiling steps. The performance of solvent for oil recovery can be categorize as follow: $\text{Tri-chloromethane}>\text{di-chloromethane}>\text{MEK}>\text{stabilized condensate}>\text{1-butanol}>\text{ethyl acetate}>\text{LPG condensate}>\text{toluene}>\text{hexane}>\text{2-propanol}$ The reactivated spent clay was applied for one step reclamation process of waste lubricating oil. It is adsorption-extraction process with solvent and additive. The activity of reactivated spent clay was compared with virgin clay during reclamation process.

The reclaimed lubricating oil was analyzed for different physical properties. It was found that the reactivation process of spent clay from acid treatment followed by thermal treatment gave the best results.

评价了石油工业废黏土的脱油和再活化过程对环境的影响。该过程包括许多技术步骤。使用溶剂萃取技术对夹带的废粘土进行除油；溶剂回收过程；再活化过程，其中用酸处理无油废粘土；在高温下进行热抛光以增加活性。许多溶剂用于除油步骤。用于采油的溶剂的性能可分为以下几类：$\text{三氯甲烷}>\text{二氯甲烷}>\text{MEK}>\text{稳定的冷凝水}>\text{1-丁醇}>\text{乙酸乙酯}>\text{液化石油气冷凝物}>\text{甲苯}>\text{正己烷}>\text{2-丙醇}$再生的废粘土用于废润滑油的一步回收。它是用溶剂和添加剂进行吸附-萃取过程。在填海过程中，将再生的废粘土的活性与原始粘土进行了比较。

分析了再生润滑油的不同物理性质。已发现酸处理后的废粘土再活化再热处理可获得最佳效果。