废加氢脱硫催化剂碱浸渣中镍、钴和铝的硫酸浸出行为

K. Manabe, A. Fuji, Tasuma Suzuki, Masakazu Niinae, J. Shibata
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引用次数: 2

摘要

催化剂广泛应用于石油炼制和化学工业。加氢脱硫(HDS)催化剂约占全球催化剂总消费量的三分之一。废HDS催化剂在氧化铝载体上含有钼、钒、镍和钴等稀有金属。在二次资源中,废HDS催化剂被认为是回收这些金属最重要的催化剂,因为它们不仅数量大、经济价值高,而且处理后也会引起环境问题。在大多数情况下,废催化剂用湿金属浸出工艺处理,如碱浸和酸浸,焙烧作为预处理步骤。在碳酸钠焙烧后水浸等碱线浸出工艺中,大部分钼和钒被选择性浸出,而大部分镍和钴在废HDS催化剂碱浸后残留在残渣中。因此,从废渣中回收镍和钴具有重要意义。渣中镍、钴主要以尖晶石形式存在,因此采用无机酸法从渣中提取镍、钴较为困难。研究了磨矿、酸浓度、浸出温度和搅拌速度对碳酸钠焙烧后废HDS催化剂硫酸水浸渣中镍和钴浸出效率的影响。磨矿、硫酸浓度和浸出温度对镍、钴和铝的浸出效率影响显著。镍和钴的提取率分别为80%和60%左右。尖晶石不受机械研磨的影响,因此,认为镍和钴的提取率相对较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sulfuric Acid Leaching Behavior of Nickel, Cobalt and Aluminum from Alkaline Leaching Residue of Spent Hydrodesulphurization Catalysts
Catalysts are widely used in petroleum refining and chemical industries. Hydrodesulphurization (HDS) catalysts account for about one third of the total worldwide catalyst consumption. Spent HDS catalysts contain rare metals such as molybdenum, vanadium, nickel and cobalt on an alumina carrier. Among secondary resources, spent HDS catalysts are regarded the most important catalysts for recycling these metals due to not only their large amounts and economic values, but also the environmental concerns if disposed of. In most cases, spent catalysts are treated with hydrometal lurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alka line leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel and cobalt are left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to recover nickel and cobalt from the residue. The main form of nickel and co - balt in the residue is spinel, therefore, it is difficult to extract nickel and cobalt from the residue using mineral acids. In the present study, the effect of grinding, acid concentration, leaching temperature and stirring speed on the leaching efficiency of nickel and cobalt from the residue after sodium carbonate roasting followed by water leaching of spent HDS catalysts with sulfuric acid was investigated. The grinding, sulfuric acid concentration and leaching temper ature significantly affected the leaching efficiency of nickel, cobalt and aluminum. However, the extraction of nickel and cobalt was ca. 80% and ca. 60%, respectively. The spinel was not affected by only mechanical grinding, therefore, it was considered that the extraction of nickel and cobalt was relatively low.
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