ABSTRACT
Most sodium and calcium phosphates are made on plants sized in ten thousands of tons per year output with the largest individual sodium tripolyphosphate (STPP) plants at about 100,000-ton scale. The next most signicant industrial phosphates in terms of volume are ammonium and potassium phosphates. Typically, these plant sizes are in the 10,000-20,000 tons per year range. Aluminum, magnesium, and lithium phosphates are manufactured on a smaller scale in hundreds or low thousands of tons per year. Other phosphates are made but at the kilogram scale (e.g., phosphates of Ba, Cr, Cu, Fe, Pb, Mn, Sn, and Zn and the pyrophosphates of Cu, Mg, Mn, Sn, and Zn were once made in Albright & Wilson’s Stratford works many years ago, in small quantities, by the alchemists).
