首页|Leaching of Nickel and Cobalt from Low-grade Nickel Laterite Ores Using Organic Acids by Aspergiilus Niger Excreted
Leaching of Nickel and Cobalt from Low-grade Nickel Laterite Ores Using Organic Acids by Aspergiilus Niger Excreted
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With shortage of sulfide nickel ores， laterite ore was paid more attention by scientists。 Because its grade is commonly lower than sulfide nickel ores， laterite ore can not be utilized effectively becoming the bottleneck of study。 Leaching laterite ores from Yuanjing， Yunnan province， organic acids show better selective than sulfide acid in nickel and cobalt recovery。 Organic acid has low dependent on pH， keeping leaching capability even higher than 3。 On the other side， when pH up to 2，sulfide acid can not leach laterite ores any more。 After four kinds of organic acid leaching laterite ores， besides citrate， malate and succinate have good leaching and effectively selective capability。Especially， succinate has the best selective leaching capability of nickel and cobalt in four kinds of organic acids for latter anion purification and separation。Isolated from waste water with sugar， Aspergillus niger (zsl) has great capability to produce organic acids and vigorous growth。 Laterite ores have been respectively processed by direct-leaching and indirect-leaching。 Indirect-leaching gives a better result than direct-leaching。 Extraction of nickel by indirect-leaching reaches 44。3%， far more than that of direct-leaching。 Moreover extraction of nickel at pulp density of 5% is higher than that at pulp density of 10%， reaching 63% in 11 days and extraction of cobalt also is 48。1% in the same period。 Compared with nickel and cobalt，iron gives low extraction in solution， containing organic acids produced by Aspergillus niger。
X. Liu@National Engineering Lab. Of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing, China--J. K. Wen@National Engineering Lab. Of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing, China--R. M. Ruan@National Engineering Lab. Of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing, China--
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