Study of the effect of Na2CO3Mass ratio as an additive in the reduction process of limonite ore to reduce impurities for increasing nickel

Bagas Muhammad Syafa, Naufal Wirasyawal Luneto, Ahmad Maksum, Agus Budi Prasetyo, Reza Miftahul Ulum, Johny Wahyuadi Soedarsono

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

Abstract

Limonite is one of the nickel lateritic ores that has an abundant amount in Indonesia. Not only nickel, limonite ore also contains many dominating compounds, such as hematite (Fe2O3), silica (SiO2), and alumina (Al2O3). Those compounds can complicate the process to increase nickel content in the limonite ore. One of the options to reduce other compounds that act as impurities in increasing nickel is using additive in pyrometallurgical/roasting process of limonite ore. Additive used in this study is Na2CO3, with the Na2CO3: limonite ore ratio varied as 0:4; 2:4; 3:4; and 4:4. The temperature of the process was approximately 825°C, determined with STA (Simultaneous Thermal Analysis) method, while characterization of the samples after process was done with XRF method. The study showed that more Na2CO3 added resulted in less content of Fe2O3, SiO2, and Al2O3 in the ore after roasting, supported with XRF data of the samples. This was possible because they reacted and binded to Na2CO3 and formed new phase, such as Na2SiO3 and Na2MgSiO4. However, Na2O shows different result from the other compound, it was increasing with the more addition of Na2CO3. It was because additive Na2CO3 increase sodium content in the ore and the reactions between Na2CO3 and other compounds in the ore created more Na2O.

Original languageEnglish
Title of host publication4th International Tropical Renewable Energy Conference, i-TREC 2019
EditorsEny Kusrini, I. Gde Dharma Nugraha
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420144
DOIs
Publication statusPublished - 3 Sep 2020
Event4th International Tropical Renewable Energy Conference 2019, i-TREC 2019 - Bali, Indonesia
Duration: 14 Aug 201916 Aug 2019

Publication series

NameAIP Conference Proceedings
Volume2255
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference4th International Tropical Renewable Energy Conference 2019, i-TREC 2019
Country/TerritoryIndonesia
CityBali
Period14/08/1916/08/19

Keywords

  • limonite ore
  • NaCOadditive
  • Nickel
  • pyrometallurgy
  • roasting
  • silica

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