... , enter the broken whole system , then sift , grade according to users‘ grain size demand , get the even ... zinc, oxidize the lead, cyanogen uric acid, potassium nitrate, sulphuric acid potassium, it is precise to bleach the powder, carbonic ... acid potassium, carbonic acid strontium, ice crystal , pyrrole worm quinoline , phosphoric acid two hydrogen calcium , food and fertilizer , fodder ...