LEACHING OF A LOW-GRADE EGYPTIAN CHROMITE ORE

Hydrometallurgical processing of low grade chromite (Barramiya, Egypt) is attained through leaching with sodium hydroxide of mechanically ac tivated chromite ores under relatively high temperature (240 degrees C ) in the presence of oxygen pressure (10 bar), The effects of temperat ure, grinding time, leaching time acid oxygen partial pressure on chro mium extraction were studied, The residual black sludge has a high iro n content and nearly negligible chromium and sodium contents, which mi nimize disposal problems.