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1·The present paper introduced mainly several methods of recovering oil fr om used bleaching clay.

本文主要介绍了回收废白土中油脂的几种方法。

2·With the raw material of spent bleaching clay of oil refining, the regenerated technology was studied.

以油脂生产中的脱色废白土为原料，制备再生白土。

3·With the raw material of spent bleaching clay of castor oil refining, castor oil was recovered by 6# solvent extraction with special equipment designed and manufactured by oneself.

以蓖麻油脱色后的废白土为原料，利用自行设计制造的专业提油设备，采用6#溶剂浸出工艺回收废白土中的油脂。

4·Either bleaching clay or clarifying clay possesses larger area, higher absorbability and better decoloration as both are resulted from activation (or acidification) process of bentonite.

漂白粘土和澄清粘土应具有较大的表面积、较高的吸附性能及褪色能力，多由膨润土经活化(酸化)处理后制成。