... citric acid and wine, grease and oil.The nut granular activated carbons are refined through carbonization and activation ... with apricot nutshell as raw material. Working Process nut shell activated carbon using coconut shell as raw material, after charring → cooling ... carbon, PAM, PAC, anthracite filter media, quartz sands, walnut shell filters, garnet filters, polishing sands, rust sands, sponge iron ...