文章摘要
液相沉淀-煅烧法制备大粒径球形四氧化三钴
Synthesis of Spherical Co3O4 with Large-size via Precipitation-Calcination Method
投稿时间:2018-04-08  修订日期:2018-09-29
DOI:
中文关键词: 四氧化三钴  微米颗粒  碳酸钴  热分解  液相沉淀
英文关键词: cobalt oxide  micron size particle  cobalt carbonate  thermal decomposition  liquid-phase precipitation
基金项目:国家自然科学基金青年基金(51502032)
作者单位E-mail
刘人生 衢州华友钴新材料有限公司 liurs@huayou.com 
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中文摘要:
      以硫酸钴为原料,碳酸氢铵为沉淀剂,采用液相沉淀法合成了大粒径球形碳酸钴,考察了不同晶种量、pH值和钴液流量对碳酸钴形貌、粒度分布、振实密度和S含量的影响,并研究了碳酸钴的生长机理。通过分步煅烧并设置不同升温时间使碳酸钴热分解,得出优化四氧化三钴理化指标的煅烧条件。实验表明,晶种量为2 kg,pH值在7.2~7.5,钴液流量500 mL/h,采用分段式热分解碳酸钴,各温区按统一时间60 min升温,所得四氧化三钴形貌为球形,中值粒径为16.5 μm,振实密度达2.2 g/cm3以上。
英文摘要:
      The spherical CoCO3 precursor was prepared by precipitation method using CoSO4 as cobalt source and NH4HCO3 as precipitating agent. The influence of seed crystal quantity, pH value, and cobalt source solution flow rate on morphology, distribution of particle size, tap density and sulfur content of CoCO3 was investigated. Meanwhile, the growth mechanism of cobalt carbonate was studied.CoCO3 precursor was calcined at different heating-up time in order to optimize the physical and chemical properties of Co3O4.The results show that large-size spherical Co3O4 with narrow particle size distribution and high tap density could be obtained in a 10L reactor with 2 kg seed crystals and cobalt source flow rate at 500 mL/h at pH value 7-7.3, and then calcined in 3 stages, with 60 minutes heating-up time for each stage. The median particle diameter of Co3O4 was 16.5 μm and tap density was over 2.2 g/cm3.
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