Sb. Kanungo et al., Beneficiation of low-grade, high-phosphorus manganese ores of Andhra Pradesh, India, by wet high-intensity magnetic separation, MIN MET PR, 17(3), 2000, pp. 181-185
An attempt was made to beneficiate low-grade, high-phosphorus manganese ol
es of the Garividi-Garbham region of Andhra Pradesh, India, by using wet hi
gh-intensity magnetic separation (WHIMS). The distribution behavior of both
mass and chemical constituents in different size fractions of a typical hi
ghly weathered ore sample was studied to obtain information about the liber
ation characteristics of various chemical constituents. Magnetic separation
indicated that in the +208-mu m size fractions, P and acid insolubles were
concentrated in the magnetic fractions. However, in the -208-mu m size fra
ctions, P and acid insolubles were concentrated in the nonmagnetic fraction
because of a lower recovery of the magnetic function. Variations in field
intensity between 1.3 and 1.75 T had little effect on the recovery and the
grade of concentrate. The results also demonstrated that phosphorus was ass
ociated with all three major constituent phases, namely oxides of Mn and Fe
and aluminosilicate gangue minerals.