湿法合成高致密碱式碳酸钴粉末及Co(Ⅱ)-NH3-CO32--H2O体系热力学分析

doi:10.19976/j.cnki.43-1448/TF.2022040

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Abstract CoCl₂ and four kinds of precipitants commonly used in industry, namely (NH₄)₂CO₃, NH₄HCO₃, Na₂CO₃ and NaHCO₃, were used as raw materials to prepare basic cobalt carbonate by wet synthesis. The as-prepared basic cobalt carbonate were studied by means of lazer particle analyzer, scanning electron microscope, X-ray diffractometer and vibrating densitometer. The effects of solution pH value and NH₃ concentration on particle size, microscopic morphology, crystal structure and density of basic cobalt carbonate powder were evaluated, and the thermodynamic analysis of Co(II)-NH₃-CO₃^2--H₂O system was performed as well. The results show that the pH value and NH₃ concentration of the solution have a great influence on the complexation and precipitation behavior of cobalt ions. Based on the complexing precipitation process, the tap density of the basic cobalt carbonate solid powders prepared with NH₄HCO₃ and (NH₄)₂CO₃ precipitant is higher. Based on the principle of simultaneous equilibrium and mass conservation, the thermodynamic diagram of lg[Co]_total on pH under different solution compositions was drawn, and the effect of solution pH value of different systems on the precipitation process was further studied. The results show that the precipitation rate of cobalt ions is more than 90% when the pH is 6-8. In the Na₂CO₃ and NaHCO₃ precipitant systems, free Co²⁺ is dominant during the transient, and it precipitates rapidly after contacting the precipitant to form loose flocculated basic cobalt carbonate powders. In the (NH₄)₂CO₃ and NH₄HCO₃ precipitant systems, Co²⁺ is coordinated with ammonia, the precipitation process procees slowly with the release of Co²⁺ from multi coordinated Co(NH₃)_n²⁺ (n=1, 2,…, 6), results in dense powders.

Key words： cobalt carbonate precipitation cobalamin coordination thermodynamic equilibrium tap density

Received: 24 March 2022 Published: 19 July 2022

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TQ138.12

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	XU Wei
	XIA Jie
	ZHANG Kejun
	HU Bin
	BAI Dehong
	HE Kai
	YUAN Tiechui
	LI Ruidi

Cite this article:

XU Wei,XIA Jie,ZHANG Kejun, et al. Wet synthesis of high-density basic cobalt carbonate powder and thermodynamic analysis of Co(Ⅱ)-NH₃-CO₃^2--H₂O system[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(3): 310-318.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022040 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I3/310

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