High Purity Nickel Recovery from an Industrial Sidestream Using Concentration and Liquid-Liquid Extraction Techniques
Research output: Contribution to journal › Article › Scientific › peer-review
- Central South University
This article outlines an alternative flowsheet for the purification of a multi-metal industrial sidestream (16.3 g/l Ni, 0.7 g/l Co, 0.6 g/l Ca and 1.6 g/l Mg) to allow high-purity nickel recovery. The methodology comprises an initial evaporation step to achieve Ca removal followed by impurity (Ca, Mg) and valuable (Co, Ni) element separation via two-step solvent extraction with organophosphorus extractants. Results indicate that > 80% of Ca is selectively removed as CaSO4 center dot 2H(2)O by evaporation with a concentration degree > 6. In the following treatment, 90% of residual Ca (0.6 g/l) can be selectively extracted with Na-D(2)EHPA. The subsequent solvent extraction step with Na-Cyanex 272 separates Co (> 99%) and Mg (> 95%). The resultant nickel sulfate solution (61.7 g/l Ni, 0.3 g/l Mg and Co 0.007 g/l) of > 99.5% purity can be directly integrated into state-of-the-art nickel recovery processes.
|Number of pages||8|
|Publication status||Published - 4 Dec 2019|
|MoE publication type||A1 Journal article-refereed|
- DIRECT SOLVENT-EXTRACTION, SODIUM-SALTS, SULFATE, PURIFICATION, COBALT, SEPARATION