METHOD OF LEATHERING LATERITE NICKEL ORE AT ATMOSPHERIC PRESSURE

摘要

An atmospheric leaching method for isolating nickel and cobalt from lateritic ores, comprising the following steps: a) separating the lateritic ore into a fraction of a low magnesium content ore and a fraction of a high magnesium content ore by selective extraction or sorting after mining; b) separately suspending separated ore fractions; c) leaching the low magnesium ore fraction using concentrated sulfuric acid in the first leaching stage and d) feeding the sludge ore with high magnesium content after essentially finishing the first leaching stage and precipitating iron in the form of goethite or in another form of oxide or hydroxide iron with a low sulphate content, where sulfuric acid liberated during iron deposition is used to leach a fraction of the ore with a high magnesium content in the second leaching stage. International The turnout was published along with an international search report.