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Priority to PH22014000780UpriorityCriticalpatent/PH22014000780U1/en
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Publication of PH22014000780U1publicationCriticalpatent/PH22014000780U1/en
It is a medium-pressure leaching process that alms to extract nickel and other valuable constituents from laterite ore at a reduced overall acid consumption. It takes advantage of the iron and magnesium content of the ores to induce in-process iron hydrolysis that regenerates acid, thereby minimizing overall acid requirement. Leaching with sulfuric acid is performed in two stages, which is composed of an atmospheric tank leaching stage and a low-pressure autoclave leaching stage. The high iron, low magnesium size fraction of the ore is leached in the atmospheric tank leaching stage, while the high magnesium, low iron size fraction of the ore is leached in the autoclave leaching stage. The resulting pregnant leach solution (PLS) is further treated to remove a1uminum and excess Iron through precipitation. The treated PLS is then added with a suitable precipitating agent to precipitate nickel and cobalt thereby precipitating nickel and cobalt to produce a saleable mixed hydroxide product.
PH22014000780U2014-12-052014-12-05Medium pressure medium temperature nickel laterite processing
PH22014000780U1
(en)
METHOD OF HYDROMETALLURGIC TREATMENT OF LATERITE NICKEL-COBALT ORE AND METHOD FOR OBTAINING INTERMEDIATE NICKEL AND / OR COBALT OR THEIR PRODUCT PRODUCTS WITH APPLICATION CARD
High pressure acid leaching of refractory lateritic ores comprising nickel, cobalt and scandium and recovery of scandium from pregnant leach solution and purification precipitates