从钴二次资源中回收钴制备四氧化三钴的研究

【作者】 宋阜；

【导师】 李新海；

【作者基本信息】 中南大学 ， 冶金工程， 2010， 硕士

【摘要】 由于我国的钴资源缺乏,国家每年都要用大量外汇进口镍钴矿及深加工资源。世界钴消费量呈增长趋势。中国已成为世界钴消费大国。从钴二次资源中回收钴,实现二次资源循环产业化已经迫在眉睫。本文研究了从废锂离子二次电池、废硬质合金料等二次资源回收钴制备钴酸锂前驱体四氧化三钻的方法；研究了COCl2与CoSO4溶液经过除铁、除钙、P204萃取除杂、P507萃取制备高纯氯化钴溶液的过程及除杂效果。废锂离子电池材料采用氢氧化钠除铝、硫酸浸提钴、水解沉铝制备CoSO4溶液；硬质合金粉料采用煅烧氧化、氢氧化钠浸出三氧化钨、盐酸+硫酸浸钴制备CoSO4溶液。结果表明,硫酸从锂离子材料中浸钴最优条件为：反应温度80℃,反应时间3 h,双氧水用量系数3.0,硫酸反应系数2.4,Co浸出率达到97%以上。氢氧化钠浸出硬质合金氧化物中的钨最优条件为：碱用量系数2.6,固液比1：4,反应时间2.0h,反应温度100℃,浸出率最高可达98%以上。硫酸浸出钴渣中的钴最优条件为：浸出温度为100℃、固液比为1：4、酸用量系数为1.8、浸出时间为2 h。钴的浸出率达到98%以上。制备的氯化钴溶液沉淀CoCO3,并经过煅烧制备Co3O4粉末。由于钴酸锂对Co3O4粉末的粒度和形貌提出越来越严格的要求,本文研究了反应pH、反应时间、搅拌转速对碳酸钴形貌及粒度的影响；对四氧化三钴粒度及振实密度的煅烧过程相关影响因素分别进行考察。结果表明反应pH、反应时间、搅拌转速对碳酸钴形貌及粒度的影响影响显著,提高反应时间及降低搅拌转速,降低pH有利于提高碳酸钴粒度及改善形貌；影响Co3O4物理指标的主要因素在一定范围内存在一定的规律,其中煅烧温度、煅烧时间是影响Co3O4粒度和振实密度的关键因素。更多还原

【Abstract】 Due to the lack of resources,China imports large quantity nickel-cobalt ore and deep processing resources by foreing exchange every year. The world is a growing trend of cobalt consμmption. China has become the world cobalt consμmption. From the second resource recovery of cobalt cobalt,realize the industrialization of secondary resources circulation is imminent.In this thesis recycling method of cobalt from the waste lithiμm-ion secondary battery,carbide materials,and other secondary resources as well as preparation method of cobalt acid lithiμm precursor-the cobalt oxide has been studied.Waste lithiμm ion battery was disintegrated at first,then alμminμm was leached by alkaline. COSO4 was prepaired by acid leaching from the residue and alμminμm sinked after. Hard alloy material was calcined at first,then tungsten was leached by sodiμm hydroxide.Use hydrochloric and sulphuric acid leach cobalt from the residue.Results show that under the appropriate technology condition,high cobalt leaching rate achieved. CoCl2 or COSO4 solution was made into high purity CoCl2 after purified by iron and calciμm elimination and organic extraction.CoCO3 was synthesized by precipitation from CoCl2 solution. Co3O4 powder was synthesized by calcined from CoCO3. Due to Co3O4 acid lithiμm cobalt powder size and morphology of forward more and more stringent requirements,in this thesis CoCO3 wet process was explored in different conditions,the size and shape of the CoCO3 were investgated. Thermal decomposition of CoCO3 in different conditions was explored and the size and shape of the Co3O4 were investgated as well as.更多还原