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| Effect of solid oxalate acid feeding on the size and morphology of precipitated nickel oxalate particles |
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Received:December 08, 2010
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| DOI：10.3969/j.issn.1005-7854.2011.01.008 |
| KeyWord:nickel oxalate；solid oxalate acid；size；morphology；controllable synthesis |
| Author | Institution |
| HUANG Kai |
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing ，China |
| HUANG Shan-yan |
Beijing General Research Institute of Mining and Metallurgy, Beijing , China |
| GUO Xue-yi |
School of Metallurgical Science and Engineering, Central South University，Changsha , China |
| ZHANG Duo-mo |
School of Metallurgical Science and Engineering, Central South University，Changsha , China |
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| Abstract: |
| Spherical and quasi-spherical nickel oxalate compound precipitated particles were prepared by feeding oxalate acid in the form of solid particles into the nickel ion solution, and a lot of waste water will be reduced due to this special feeding way instead of the traditional oxalate acid solution. It has been experimentally verified that feeding one batch at a time, ultrasonic effect, shortening aging time, lowering the aging temperature, taking nickel nitrate as the source of nickel ion, and adding of surfactant would be beneficial to the attenuation and dispersing of the precipitated particles, and especially the pH of solution shows greater effect on the morphology of particles. Feeding of solid oxalate acid into the nickel ion solution from the initial pH of 11 to lower levels, a dissolution-recrystallization phenomenon of precipitated particle occurs and the shape of particles will transfer from quasi-spherical to needle-like or rod-like. The precipitated particles obtained under alkaline conditions were mainly composed of complex nickel oxalate contained ammonia, while in acidic solution it was nickel oxalate, which both could decompose into nickel oxide particles at the temperature of 400oC. |
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