Preparation of cobalt oxalate powders with the presence of a pulsed electromagnetic field

• Published in: Powder technology Vol. 199; no. 2; pp. 149 - 153
• Main Authors: Du, Huiling, Wang, Jianzhong, Wang, Bing, Cang, Daqiang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 23.04.2010; Elsevier
• Subjects: Applied sciences; Chemical engineering; Cobalt oxalate powder; Exact sciences and technology; Miscellaneous; Particles morphology; Preparation; Solid-solid systems; Particles morphology; Preparation; Cobalt oxalate powder; Differential scanning calorimetry; Scanning electron microscopy; Morphology; Production; Thermogravimetry; Thermal analysis; Powder
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2009.12.015

The size and morphology of cobalt oxalate powders are the keys to metal cobalt powder production. Spheroidic and fine cobalt oxalate powders were prepared by conventional precipitation when a pulsed electromagnetic field (PEMF) was introduced. The phase structures of the produces were characterized by means of X-ray powder diffraction (XRD). Scanning electron microscopy (SEM) images were used to observe the morphologies of the cobalt oxalate powders. Thermal analyses were performed using TG–DSC thermogravimetric analyzer. Meanwhile, a possible mechanism was proposed based on the interaction between pulsed electromagnetic field and cobalt oxalate cluster. β-CoC 2O 4 ∙ 2H 2O powders were prepared from cobalt chloride and ammonium oxalate when a pulsed electromagnetic field (PEMF) was introduced. A satisfactory morphology of products with spheroidicity was obtained. A possible mechanism was proposed based on the interaction between pulsed electromagnetic field and cobalt oxalate clusters. [Display omitted]