The invention relates to a method for collecting ferronickel concentrate from lateritic
nickel ores by a
rotary kiln. The lateritic
nickel ores are crushed, stirred and mixed with a carbonaceous
reducing agent and a compound additive, made into
pellets by a ball press or a marble
machine and put into the
rotary kiln for reducing and
roasting;
waste heat at the front part of the
rotary kiln is used for carrying out the
drying and preheating of the
pellets; the high-temperature area of the rotary
kiln is 9 to 10 meters away from a
kiln outlet; the temperature of the high-temperature area is controlled to be 1000 to 1300 DEG C;
roasting time is 0.5 to 2 hours; the dried
pellets enter the high-temperature area of the rotary
kiln for reducing and
roasting; a
magnetic separator with a
magnetic field intensity of 3000 to 5000 gauss is adopted to sort roasted material obtained after water
quenching and wet ball milling, thus obtaining high-content ferronickel concentrate; the method can realize the simultaneous recycling of
nickel and iron and obtain the high-content ferronickel concentrate; the content of nickel is 5 to 13 percent and the recycling rate of nickel is 85 to 93 percent; the content of iron is 30 to 75 percent and the recycling rate of nickel is 60 to 85 percent; the reasonable utilization of the
waste heat during process procedure achieves the purposes of saving energy and reducing
discharge and greatly reduces
pollution to the environment.