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The enrichment of Ni from a low-grade saprolitic laterite ore,which has been pre-treated by high pressure grinding roller(HPGR)to be 74% passing 0.074 mm and contains 0.92% Ni,18.47% Fe,10.61% MgO and 42.27% SiO2,was conducted by using pelletizing,rotary kiln reduction and magnetic separation process on a semi industrial scale,and the effects of reduction duration,mass ratio of coal to pellets(C/P),the types of magnetic separator,the sections of grinding-separation and the grinding fineness on the recovery of Ni and Fe were examined.It is shown that nickel concentrate containing 3.13 % Ni and 59.20 % Fe was achieved at recoveries of 84.36 % and 71.51 % for Ni and Fe,respectively under the following conditions: reducing at(1120±40)°C for 120 min,C/P being 1.0,wet grinding of reduced pellets up to 70%-87% passing 0.074 mm and a magnetic field intensity of 238.8 kA/m during the first section of grinding-magnetic separation,and a grinding fineness of 84%-91% passing 0.045 mm and a magnetic intensity of 39.8 kA/m during the second section of grinding-magnetic separation.The enriched Ni containing concentrate has a low content of S and P,and can be used for further processing to produce high-grade ferronickel alloy.
The enrichment of Ni from a low-grade saprolitic laterite ore, which has been pre-treated by high pressure grinding roller (HPGR) to be 74% passing 0.074 mm and containing 0.92% Ni, 18.47% Fe, 10.61% MgO and 42.27% SiO2, was conducted by using pelletizing, rotary kiln reduction and magnetic separation process on a semi industrial scale, and the effects of reduction duration, mass ratio of coal to pellets (C / P), the types of magnetic separator, the sections of grinding -separation and the grinding fineness on the recovery of Ni and Fe were examined. It is shown that the nickel concentrate contains 3.13% Ni and 59.20% Fe was achieved at recoveries of 84.36% and 71.51% for Ni and Fe, respectively under the following conditions : reducing at (1120 ± 40) ° C for 120 min, C / P being 1.0, wet grinding of reduced pellets up to 70% -87% passing 0.074 mm and a magnetic field intensity of 238.8 kA / m during the first section of grinding-magnetic separation, and a grinding fineness of 84% -91% passing 0.045 mm and a magnet ic intensity of 39.8 kA / m during the second section of grinding-magnetic separation. The enriched Ni containing concentrate has a low content of S and P, and can be used for further processing to produce high-grade ferronickel alloy.