摘要
以粗铜精炼富钴废渣为原料,通过硫酸氧化浸出,得到浸出液,然后采用草酸铵沉淀-固态盐热分解法合成Co3O4粉体。考察了草酸铵用量、沉淀反应温度、沉淀终点pH值等对钴沉淀率的影响,探索了草酸钴分解得到Co3O4的温度条件。采用X射线衍射对草酸钴和Co3O4粉体进行了分析。实验结果表明:沉钴反应温度40℃,草酸铵用量为理论量的1.1倍,反应终点pH值为1.8,钴的沉淀率可达99.7%,所得草酸钴含钴量达到30.2%。在草酸钴热分解为Co3O4的温度范围内(450～750℃,保温3 h),随着分解温度的升高,分解所得Co3O4逐步向活性Co3O4转化,晶形逐步变好。
Using blister refining cobalt-rich slag as raw material,the leach liquor was obtained by sulphuric acid oxidation leaching,and Co3O4 powders was prepared by ammonium oxalate precipitation-solid salt thermal decomposition method.The effects of ammonium oxalate dosage,precipitation reaction temperature and pH value at the precipitation reaction end on the precipitation rate of cobalt were investigated.The temperature conditions of Co3O4 obtained by cobalt oxalate decomposition were explored.Analyses on cobalt oxalate and Co3O4 powder by X-ray diffraction（XRD） were carried out.The experimental results showed that the precipitation rate of cobalt could reach 99.7% and cobalt content in the obtained cobalt oxalate reached 30.2% under the conditions that the cobalt precipitation reaction temperature was 40℃,the dosae of ammonium oxalate was 1.1 times of theoretical dosage and pH value at the reaction end was 1.8.In the temperature range（450～750 ℃,3 h）,Co3O4 could be prepared by thermal decompostion of cobalt oxalate,and with the increase of decomposition temperature,the obtained Co3O4 by decomposition gradually transformed into active Co3O4,the crystal form tended better.
出处
《矿冶工程》
CAS
CSCD
北大核心
2011年第4期86-89,共4页
Mining and Metallurgical Engineering
基金
中南大学研究生学位创新论文(2010ssxt140)
关键词
富钴废渣
草酸盐沉淀法
草酸钴
热分解
CO3O4
cobalt-rich slag
oxalate precipitation method
cobalt oxalate
thermal decomposition
Co3O4
