SYNTHESIZED NICKEL SULFATE FROM MIXED HYDROXIDE PRECIPITATE
The increasing production and use of electric vehicles worldwide, including in Indonesia, has led to a higher demand for nickel sulfate as a raw material for lithium cathodes in electric vehicle batteries. With the world's largest nickel reserves, Indonesia emphasizes its commitment to the d...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/85031 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The increasing production and use of electric vehicles worldwide, including in Indonesia,
has led to a higher demand for nickel sulfate as a raw material for lithium cathodes in
electric vehicle batteries. With the world's largest nickel reserves, Indonesia emphasizes
its commitment to the downstream nickel industry. Currently, in Indonesia, the
production of mixed hydroxide precipitate (MHP) and nickel alloys is still insignificant,
and the pure nickel and battery industries have not yet been developed. The production
process of nickel sulfate from MHP consists of three main stages: (1) releaching with
sulfuric acid, (2) solvent extraction (SX), and (3) crystallization. This study aims to
investigate the optimum conditions for purifying MHP into nickel sulfate. The sample
used in this study was artificially made pregnant leach solution (PLS) prepared based on
the concentration of PLS obtained from the releaching of MHP in previous research. SX
is carried out in two general stages with the objectives of (1) separating magnesium
impurities and (2) separating nickel and cobalt ions. The organic solutions used for the
first and second SX stages are Versatic 10 and Cyanex 272, respectively. The solution
from extraction process will be analyzed using Atomic Absorption Spectroscopy (AAS)
to determine compositional changes at each stage of the process. The research results
show that the SX 1 stage can separate nickel and cobalt from magnesium using Versatic
10 at temperature = 40°C, organic/aqueous (O/A) ratio of 0.75, %extractant = 25%, and
pH = 7.0. The resulting separation factors (?) were ?Ni-Mg = 208.75 and ?Co-Mg = 123.19.
Meanwhile, the SX 2 stage using Cyanex 272 successfully separated nickel and cobalt
ions at temperature = 40°C; O/A = 0.5; %extractant = 10%; and pH = 5.5. The resulting
extraction percentages for nickel and cobalt were 3.1% and 100%, respectively.
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