The recovered base oil is transferred into base oil bleaching vessels batch wise from recovered base oil tank by base oil transfer pump The temperature is raised to about 100⁰C to 120⁰C and calculated amount of bleaching earth is added to the bleaching vessel under constant agitation and circulation by base oil circulation/ filtration pump .

The bleaching earth reacts to remove the color. While bleaching is going on in one of the vessels the other is feeding the base oil and bleaching earth slurry to base oil filter press through its circulation/ filtration pump. The clear filtered and bleached oil is collected in bleached base oil tanks, While one filter press is in operation the other is under cleaning.

Also the recovered spindle oil is transferred into spindle oil bleaching vessels batch wise from recovered spindle oil tank by spindle oil transfer pump. The temperature is raised to about 100⁰C to 120⁰C and calculated amount of bleaching earth is added to the bleaching vessel under constant agitation and circulation by spindle oil circulation/ filtration pump. The bleaching earth reacts to remove the color.

After bleaching the spindle oil and bleaching earth slurry is fed to spindle oil filter press through its circulation/ filtration pump. The clear filtered and bleached oil is collected in bleached spindle oil tank. The filter press is in operation for 16 hrs. a day is idle for 8 hrs for cleaning.