... 3) High filtration speed 4) Low rate of residual oil Activated clay for oil refinery with high gradeThe activated clay is a type of ... (over 0.075mm test sieve),%99Filtration rate, ml/min<=10Heavy metal(pb) , mg/kg<40Arsenic content(As) , mg/kg<3Water content ... by effective, such as phosphorus oil,soap and trace metal oil and aflatoxin,pigment,colloid,impurity,dram heavy metal in lipid which can cause ...