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首页> 外文会议>International Symposium on East Asian Resources Recycling Technology（EARTH 2005); 20051109-15; Beijing(CN) >Comparison of Two Acidic Leaching Processes for Selecting the Effective Recycle Process of Spent Lithium Ion Battery
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Comparison of Two Acidic Leaching Processes for Selecting the Effective Recycle Process of Spent Lithium Ion Battery

机译：选择废锂离子电池有效回收过程的两种酸性浸出工艺的比较

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Physical treatment and chemical treatment of spent lithium-ion battery were studied in our research team. Especially we developed two types of acidic leaching for crushed powders containing LiCoO_2 of spent lithium ion battery. One of them is sulfuric acid leaching with H_2O_2 as a reducing agent. The leaching rates of cobalt, lithium and the other metals were above 99% at the condition of 2 M H_2SO_4, 10 vol. % H_2O_2, 75℃, 300 rpm agitation speed, 250 g/5L solid liquid ratio and 75 minutes reaction time. And the other leaching process is the oxalic acid leaching. In this process more than 99% of Li and less than 1% of Co were dissolved at the condition of 3M oxalic acid, 80℃ reaction temperature, 300rpm agitation speed, 50g/L initial solid/liquid ratio and 90min extraction time. Each process has its advantage and disadvantage. In sulfuric acid leaching, leaching reagent is very cheap and cobalt could be recovered into cobalt hydroxide. On the other hand, oxalic acid is more expensive than sulfuric acid but lithium could be dissolved selectively. Also cobalt could be recovered into cobalt oxalate and it could be changed into cobalt oxide after heat treatment. In order to select the effective recycling process, recovery rate and purity of cobalt hydroxide and cobalt oxalate were compared and it was investigated which process was more environment-friendly and economical.
机译：我们的研究小组对废锂离子电池的物理处理和化学处理进行了研究。特别是，我们开发了两种类型的酸性浸出法，用于废锂离子电池含LiCoO_2的压粉。其中之一是用H_2O_2作为还原剂的硫酸浸出。在2 M H_2SO_4、10 vol.2的条件下，钴，锂和其他金属的浸出率均高于99％。 ％H_2O_2、75℃，300 rpm搅拌速度，250 g / 5L固液比和75分钟反应时间。而另一个浸出过程是草酸浸出。在3M草酸，80℃反应温度，300rpm搅拌速度，50g / L初始固/液比和90min提取时间的条件下，该过程中溶解了99％以上的Li和1％以下的Co。每个过程都有其优点和缺点。在硫酸浸出中，浸出试剂非常便宜，并且可以将钴回收成氢氧化钴。另一方面，草酸比硫酸更昂贵，但是锂可以选择性地溶解。钴也可以回收为草酸钴，经过热处理后可以转变为氧化钴。为了选择有效的回收工艺，比较了氢氧化钴和草酸钴的回收率和纯度，并研究了哪种工艺更环保，更经济。

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