Effect of O₂, H₂ and CO pretreatments on leaching Rh from spent auto-catalysts with acidic sodium chlorate solution

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• 作者：Shuai Chen^a ; ^b ; Shaobo Shen^a ; ^b ; ^{shaoboshen@metall.ustb.edu.cn" class="auth_mail} ; Yao Cheng^a ; ^b ; Hongjuan Wang^a ; ^b ; Bochao Lv^a ; ^b ; Fuming Wang^b
• 关键词：Spent auto-catalyst ; Rhodium ; Extraction ; Oxidation&ndash ; reduction pretreatment ; Chlorate leaching
• 刊名：Hydrometallurgy
• 出版年：April, 2014
• 年：2014
• 卷：144-145
• 期：Complete
• 页码：69-76
• 全文大小：1006 K

文摘

Rh extraction from spent auto-catalysts in an efficient and economical way is still an unresolved problem. In this work, the spent auto-catalyst samples were pretreated with O₂, H₂ and CO under certain temperatures. After the pretreatments, the samples were leached with acidic sodium chlorate solutions to extract Rh. The Rh extraction for the sample without any pretreatment was 56%. The optimal temperature, time and flow rate of O₂ for the O₂ pretreatment were 300 掳C, 3 h and 200 mL/min, respectively, and the Rh extraction under these conditions was 69%. Following O₂ pretreatment under optimal condition, H₂ or CO pretreatment was also carried out, respectively. The optimal temperature, time and flow rate of H₂ for the H₂ pretreatment were 300 掳C, 3 h and 200 mL/min, respectively, and the Rh extraction in this case was 82% . The optimal temperature, time and flow rate of CO for the CO pretreatment were 300 掳C, 1 h and 150 mL/min, respectively, and the Rh extraction in this case was 80% . In addition, the effects of pretreatment with H₂ and CO only on Rh extraction were also studied. It was found that pretreatment with O₂ only was more effective than pretreatment with H₂ and CO only, and O₂ pretreatment plus a following H₂ pretreatment was the most effective means to raise Rh extraction. Additionally, the possible mechanisms involved in pretreatment effects were also investigated.