A preliminary study on the reduction of limonite ore by using rice husk as a reducing agent

Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering

材料科学;冶金学;化学工业

Maksum, Ahmad^1,2 ; Husein, Michael Kelvin E.^1 ; Permana, Sulaksana^1 ; Rustandi, Andi^1 ; Soedarsono, Johny Wahyuadi^1

Center of Minerals Processing and Corrosion Research, Department of Metallurgical and Materials Engineering, Universitas Indonesia, Depok

16424, Indonesia^1

Department of Mechanical Engineering, Politeknik Negeri Jakarta, Depok

16425, Indonesia^2

关键词: Atomic absorption spectroscopy;    Calcinations process;    Direct Reduction;    Ferronickel;    Limonite;    Optimum concentration;    Reduction process;    Rice husk;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/316/1/012050/pdf
DOI  :  10.1088/1757-899X/316/1/012050

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The abundant of rice husk in Indonesia has encouraged researchers to study the feasibility of rice husk for substituting material that is more expensive or dangerous. In previous study, silica with a purity of 99.9% has been obtained from rice husk with calcinations process. Nevertheless, the gases resulting from the process were not used and left useless. Therefore, in this study, those gases derived from rice husk calcinations process were used as reducing agents during the ferronickel (Fe-Ni) production through a direct reduction process. The objective of this study was to investigate the effect of the amount of rice husk in the pellets on the increase of nickel content in the limonite reduction process. The limonite ore were crushed to the size of less than 150 mesh using disc-mill, and then were mixed with rice husk powder (10, 20, 30 in wt % mass) before being pelletized using bentonite as a binder. The resulted pellets were roasted at 500°C for 60 minutes and then quenched in water media. After drying process, the reduction process of 40g pellets was conducted at 1000°C for 90 minutes with 20g rice husk in furnace. The effects of additional rice husk on the direct reduction of limonite ore pellets were qualitatively analyzed by using X-ray powder diffraction (XRD) and quantitatively by Atomic absorption spectroscopy (AAS). Both analysis results showed that the reduction process followed the reaction scheme: Fe2O3→Fe3O4→FeO and NiO phase was detected in the sample with 20% rice husk addition. The optimum concentration of Ni 1.23% was obtained for 20% rice husk addition.