期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 179, 期 1-3, 页码 488-494出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.03.029
关键词
Platinum; Spent catalyst; Liquid-liquid extraction; Waste management
资金
- CAPES
- Agenda Nacional de Petroleo, Gas Natural e Biocombustiveis (ANP)
- CNPq
This work examines a hydrometallurgical route for processing spent commercial catalysts (Pt and PtSnIn/A(2)O(3)) used in Brazilian refineries for recovery of the noble metal with less final wastes generation. Samples were initially pre-oxidized (500 degrees C, 5 h) in order to eliminate coke. The basis of the present route is the partial dissolution of the pre-oxidized catalyst in aqua-regia. Temperature and time necessary to dissolve all platinum were optimized in order to reduce the operation severity and aluminum solubilization. All platinum and 16-18 wt.% of aluminum were dissolved at 75 degrees C in 20-25 min. Separation of platinum from the acidic solution was accomplished by solvent extraction. The best extractant (>99 wt.%) was Aliquat 336 (a quaternary ammonium salt) in one stage (A/O phase ratio = 1, v/v). Platinum was stripped (>99.9 wt.%) in one stage (A/O phase ratio= 1, v/v) with aqueous sodium thiosulfate (>= 0.75 mol L-1). Black platinum was obtained from this solution via reduction with magnesium or ascorbic acid. (C) 2010 Elsevier B.V. All rights reserved.
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