Metals recovery from spent hydrotreatment catalysts in a fluoride-bearing medium

被引：32

作者：

de Lima, TS ^{[1
]}

Campos, PC ^{[1
]}

Afonso, HC ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Quim, Dept Quim Analit, BR-21949900 Rio De Janeiro, Brazil

来源：

HYDROMETALLURGY | 2005年 / 80卷 / 03期

关键词：

spent catalyst; metals recovery; fluoride ion;

D O I：

10.1016/j.hydromet.2005.08.009

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This work examines the dissolution of spent commercial NiMo/Al2O3 and CoNlo/Al2O3-SiO2 catalysts in aqueous solutions containing fluoride ions under mild experimental conditions. Solubilization of samples in the presence of fluoride salts alone was insignificant, but solubilization in pure HF was quantitative after 14-16 h. The addition of a strong inorganic acid led to full solubilization after 30 min (NiMo) or 4 h (CoMo) at 50-60 degrees C and a stirring speed of 400 rpm. This time was reduced by at least 75% when hydrogen peroxide was added. HF was the best source of fluoride ions for dissolving SiO2 and phosphate-containing species. The recovery of metals from the leach solution could be accomplished very efficiently and with low residue generation. (c) 2005 Elsevier B.V All rights reserved.

引用

页码：211 / 219

页数：9

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