walnut shell,almond shell,peach shell as raw materials. walnut shell,almond shell,peach shell as raw materials. 1)H3 PO4 Method nut shell AC series PA-1PA ... ≤10≤10PHvalue3-53-53-53-5 2)ZnCL2 Method Nut shell AC series GA-1GA-2GA-3GA-4Particle size meshe8-60mesh8 ... ≤10PH value3-53-53-53-5 3)Steam Method Nut shell AC series Particle size meshIodine number(mg/g)Methyl blue ...