Natural goethite and hematite

Leaching of ores, i.e. the separation of Fe oxides from silicate minerals has prompted investigations into the acid dissolution behaviour of natural goethites and hematites (Surana Warren, 1969 Warren Roach, 1971). Dissolution curves 

Coethite source Fe content gkg- AI/(Fe+AI) mol mo MCLjol nm Surface area -T m g Dissolution rate k/min  

---