Hydrometallurgical process for separation and recovery of product from serpentine waste. (1st September 2013)

• Record Type: Journal Article
• Authors: Zhu, P.; Cao, Z. B.; Chen, Y.; Qian, G. R.; Lu, B.; Zhou, M.; Zhou, J.
• Is Part Of: Transactions. Volume 122:Number 3(2013)
• Page Start: 157
• Page End: 164
• Publication Date: 2013-09-01
• Subjects: Serpentine waste -- Grinding -- Countercurrent leaching -- Solvent extraction -- Separation; Ore-dressing -- Periodicals; Metallurgy -- Periodicals; Mineral industries -- Periodicals; 622.7
• DOI: 10.1179/1743285513Y.0000000042
• Languages: English
• ISSNs: 0371-9553

Abstract

Abstract : The purpose of this study was to develop a process to recover value product from serpentine wastes using countercurrent leaching and solvent extraction. Countercurrent leaching of serpentine waste was carried out in 31% hydrochloric acid solution at 90°C using refluxing process. After countercurrent leaching of three times, acid concentration of leaching solution decreased from 5-6 to 0·5 mol L −1 and metal ion concentrations increased double. Solid residues were separated from countercurrent leaching solution by filtering process. The filtered leaching solution was extracted by mono-(2-ethylhexyl) 2-ethylhexyl phosphonate (P507 ) extractant saponified by sodium bicarbonate. The impure elements of iron, aluminum, and calcium were removed from countercurrent leaching solution. Subsequently, naphthenic acid extractant saponified with <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="sodium carbonate">sodium carbonate was used to extract nickel from above raffinate solution, and remaining element was only magnesium in raffinate solution. Filtered solid residues were leached in 20% sodium hydroxide solution, which was used to prepare white carbon black.