Ore Crushing Process Line in India

EXAMPLE m The liquid overflow from the system in Example 11 containing 0.09 troy ounces per ton gold was returned to the centrifuge under the conditions of Example 11 except that the centrifuge speed was increased to 300 RPM. The products from the centrifuge were as follows in Table III. TABLE 111 Nozzle %Total %Total Ratio Gold Solids Gold2Solids H (retained) 15.08 11.60 121.30 G (retained) 5.78 4.45 121.30 F-B (retained) 6.85 6.85 1:1.00 H-B 27.18 27.46 120.99 Overflow 34.20 38.00 L:ore processing equipment,0.90.Insufficient solids were present in the centrifuge to indicate beneficiation in the nozzle discharge. However, the centrifuge residues in proximity to nozzles H and G indicated a 30 per cent beneficiation. No beneficiation was evident in the residues at nozzles F-B.

The foregoing Examples indicate beneficiation of the mineral mixture in the products to nozzles H and G, either in the residue or in the nozzle discharge.Although the description of the Examples has proceeded with reference to a frusto-conical centrifuge having a feed impeller at the base, i.e., wide end, and the truncated portion in an upwards position, it will be understood that the centrifuge of this configuration can be disposed on its side or inverted with the wide end upwards. Also, the feed impeller can be centrally located at the bowl end remote from the wide end. Centrifugal force created by rotation of the centrifuge substantially overcomes the effects of gravity and centrifuge disposition is therefore not critical. The location of the feed impeller at the bowl narrow end remote from the wide end can provide the advantages of increasing centrifugal forces with reduced longitudinal slurry flow velocities as the wide end of the bowl is reached such that the colloidal and near-colloidal solids remaining in the slurry obtain optimum effects from centrifugal forces with maximum retention time.

FIG. 6 illustrates such an embodiment of my invention in which the frusto-conical bowl is...