Iron precipitation from nickel laterite ores using sulfuric acid atmospheric leaching with addition of hydrogen peroxide

Currently, due to the decreasing availability of sulfide ores, laterite ores are attracting much attention as nickel reserves. Laterite ore with nickel content of 1.35% can not be processed in Indonesia, therefore it is necessary to do processing in order to increase the laterite ore grade. One of n...

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Bibliographic Details
Main Authors: Setiawan, Iwan, Oediyani, Soesaptri, Setiawati, N., Irawan, Januar, Subagja, Rudi, Rhamdani, Ahmad Rizky, Lalasari, Latifa Hanum
Format: Conference Proceeding
Language:English
Subjects:
Calcium carbonate
Hydrogen peroxide
Iron
Laterites
Leaching
Minerals
Nickel
Stirring
Sulfuric acid
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Summary:Currently, due to the decreasing availability of sulfide ores, laterite ores are attracting much attention as nickel reserves. Laterite ore with nickel content of 1.35% can not be processed in Indonesia, therefore it is necessary to do processing in order to increase the laterite ore grade. One of nickel laterite processing is leaching in sulfuric acid solution. To produce a product with high levels of the metal nickel-metal impurities that come dissolved, particularly iron must be removed first from the results of the leaching solution. After separating the iron, nickel is deposited so that an intermediate product is produced in the form of Mixed Hydroxide Precipitate. The experiment was started by leaching using 1 M H2SO4 solvent, leaching time 6 hours, S/L 10 g/100 ml, stirring speed 400 rpm, variations in the addition of hydrogen peroxide 3, 5, 7, and 9 ml, and variations in temperature 30, 50, 70, and 90°C. The leached solution was then separated from the iron in 2 stages, namely the first stage with the addition of 25 wt.%/wt.% CaCO3 at a temperature of 90°C, a time of 2 hours, and a pH of 4.25. Then the second stage was with the addition of CaCO3 12.5 w/w with a temperature of 70°C, time of 1 hour, and pH 7. After that, nickel was deposited using MgO 20% wt.%/wt.% at a temperature of 50°C, 1 hour, and pH 9. The results showed that the highest extraction percent was achieved in 1 M H2SO4 conditions, leaching time of 6 hours, S/L 10 g/100 ml, stirring speed of 400 rpm, the addition of 9 ml of hydrogen peroxide and a temperature of 90°C is equal to 94.47%.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0186246