The effect of pre-treatments to the nickel limonite leaching using dissolved gaseous SO2-air

Mineral Processing and Technology International Conference 2017

Wulandari, W.^1 ; Soerawidjaja, T.H.^1 ; Alifiani, D.^1 ; Rangga, D.A.^1

Deparment of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Bandung, Ganesha 10, Bandung

40132, Indonesia^1

关键词: Nickel ores;    Nickel recovery;    Pre-Treatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/285/1/012006/pdf
DOI  :  10.1088/1757-899X/285/1/012006

来源: IOP

【 摘 要 】

Nickel limonite leaching has been subjected to a number of studies, one of the method is by using dissolved gaseous SO2-air. The selectivity of nickel over iron extracted from leaching using dissolved gaseous SO2-air is advantageous, however the nickel that can be recovered is limited. This paper studies pre-treatments that is applied to the nickel ore prior leaching in order to increase the recovery of dissolved nickel from nickel limonite ore. There two pre-treatments that were carried out in this research, roasting and alkali-roasting using Na2CO3. The extraction was carried out for 180 min with pH 2, 3, 4, and 5 and temperature 30, 55, and 80 °C. It is found that the highest yield is achieved at pH 2 and 80 °C with nickel recovery of 61.39%. At pH 2, for alkali-roasting pre-treatment, the nickel yield raised from 28.17% to 100% and for roasting pre-treatment the nickel yield increased from 20.42% to 61.39%. However, at pH 2, the nickel to iron selectivity decreased from 96272 to 534 for roasting pre-treatment and from 1.8 to 1 for alkali-roasting pre-treatment.