Effects of Na2SO4 addition on the selective reduction of limonite ore from Southeast Sulawesi

2nd international Tropical Renewable Energy Conference 2017

Rahmat, Rinanda^1 ; Maksum, Ahmad^1,2 ; Delfiendra^3 ; 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

Center for Testing and Identification of Goods, Directorate General of Customs and Excise, Jakarta, Indonesia^3

关键词: Lateritic ores;    Mineral processing;    Nickel laterite;    Nickel sulfide;    Reduction process;    Reduction time;    Selective reduction;    Temperature rising;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/105/1/012068/pdf
DOI  :  10.1088/1755-1315/105/1/012068

来源: IOP

【 摘 要 】

In terms of its process, although only about 40% of the world's nickel reserves are classified as lateritic ore, nickel sulfide still dominates nickel laterite for its practicality. Because of the high demands on nickel, development and research on nickel mineral processing are needed to ensure that the demands are fulfilled from year to year. On this research, a study will be conducted on the effect of adding Na2SO4to increase the level of nickel content in limonite by selective reduction process. The reduction process is done by heating limonite ore and coal as reducer from room temperature to 1000°C with temperature rising to 10°C/minute in mini furnace on varying addition of 0%, 5%, 10%, and 15% Na2SO4. After that, the reduction result is tested on XRD and AAS. It has been found that the nickel content has decreased, which is likely due to the excessive reduction time resulting in the magnetite being re-oxidized to hematite. Therefore, based on recovery calculations, the optimal addition of Na2SO4is 5% by weight where the obtaining nickel content is 1.09%.