Method for processing limonite lateritic nickel

The invention discloses a method for processing limonite lateritic nickel, which comprises the following steps of: (1) curing raw ores, i.e. crushing and grinding the raw ores of the limonite lateritic nickel, adding concentrated sulfuric acid, uniformly mixing the concentrated sulfuric acid and the crushed and ground raw ores and carrying out curing roasting to obtain cured materials, wherein the processed ores have the water content of 5 to 30 percent; (2) carrying out selective normal-pressure leaching on the curing materials, i.e. directly carrying out normal-pressure leaching on the cured materials obtained in the step (1) at a stirring rotating speed of 200 to 600rpm, carrying out thickening separation on the leached ore pulp to obtain leachate and leached residues, carrying out thickening washing on the leached residues to obtain washing solution and high-iron residues and returning the washing solution to the water leaching process; and (3) carrying out magnetizing roasting and magnetic separation on the high-iron residues, i.e. adding the high-iron residues obtained in the step (2) into coal of which the weight is 3 to 20 percent of a dry basis of the high-iron residues to carry out magnetizing roasting and carrying out water quenching, ball milling and magnetic separation on the obtained calcine to obtain the iron concentrate with the iron content of over 63 percent.The method has strong process operability, good leaching selectivity and high comprehensive utilization rate of iron.