Global Phosphate Rock Reserves and Resources, the Future ...
Jul 23, 2020· – Froth flotation employed in in 1920s1930s, employed in North Africa and Middle East in last 15 years P 2 O 5 – Grade inversely proportional to recovery *Carbonate flotation breakthrough – IFDC, 1990s Today, phosphate rock production is geared to phosphoric acid production based on acceptable impurities and losses.