Effect of desulfurization agent, temperature and roasting-reduction process time on high-pressure acid leaching (HPAL) nickel laterite residue

Yurian Ariandi Andrameda, Rininta Triaswinanti, Quinta Nadya Madra, Yeni Novitasari, Nur Ikhwani, Adji Kawigraha, Sri Harjanto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

About 80% of nickel laterite ore's feed from high pressure acid leaching (HPAL) process becomes residue with Fe content of about 45% in the hematite compound makes this residue potentially reusable and not just thrown into dam or placement in a deep sea. The big challenge is to reduce the sulfur content by 5-6% of the residue so it can be used by the steel and industry. This study intends to examine the effect of adding desulfurizing agents (CaO, ZnO, and Na2CO3), temperature (600-900°C) and duration (15-120 minutes) of roasting-reduction to the reduction of sulfur content. The addition of a reducing agent using biomass charcoal with a fixed ratio of 10 wt.% and 10 wt.% desulfurizing agent is intended to change the residual compound from hematite to magnetite, the mixture is pelletizing manually. The desulfurization agent has the role of binding sulfur in the sulfate bond SO2-, either in the form of CaSO4, ZnSO4, or Na2SO4, so that the sulfur content in the magnetite product can be significantly reduced. Changes that occur during the process are observed and analyzed for roasting-reduction products using XRF, XRD. From this study can be concluded that to improve the quality, the longer the process will be better, but for the best combustion efficiency, within 30-60 minutes with the use of Na2CO3 agent is enough. At a temperature of 800-900°C for 30-60 minutes, the addition of Na2CO3 has a greater effect because the discovery peaks of Fe metal and wustite compounds because Boudoard reaction. The sulfur reduced from 6.183 to 1.5 wt.% with degree of reduction 65%.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
EditorsSigit Dwi Yudanto, Ari Yustisia Akbar, Fendy Rokhmanto, Made Subekti Dwijaya, Muhammad Yunan Hasbi, Wahyu Mayangsari, Yudi Nugraha Thaha
PublisherAmerican Institute of Physics
Edition1
ISBN (Electronic)9780735448124
DOIs
Publication statusPublished - 28 Feb 2024
Event5th International Seminar on Metallurgy and Materials, ISMM 2022 - Tangerang Selatan, Indonesia
Duration: 22 Nov 202223 Nov 2022

Publication series

NameAIP Conference Proceedings
Number1
Volume3003
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference5th International Seminar on Metallurgy and Materials, ISMM 2022
Country/TerritoryIndonesia
CityTangerang Selatan
Period22/11/2223/11/22

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