Effect of colloidal potassium alum formation on vanadium recovery from acid leach solutions of stone coal
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- 作者：Yimin Zhang ; Xiaobo Zhu ; Tao Liu ; Jing Huang ; Shaoxian Song
- 关键词：Potassium alum ; Vanadium recovery ; Thermodynamics ; Acid leaching ; Stone coal
- 刊名：Hydrometallurgy
- 出版年：2013
- 出版时间：June, 2013
- 年：2013
- 卷：138
- 期：Complete
- 页码：54-58
- 全文大小：611 K
文摘
The nattier-blue colloidal particles precipitated out from the sulfuric acid leach solution of stone coal were identified to be potassium alum (KAl(SO4)2 ¡¤ 12H2O). The particles were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM) and theoretical analysis with thermodynamics of ion crystallization. The results show that the particles belonged to potassium alum with micro-scale granular surfaces. The colloidal potassium alum formed with the temperature of the leaching solution cooling to 45 ¡ãC. This observation could lead to 27.6 % vanadium loss in the vanadium extraction process, which might be attributed to the chemical adsorption of vanadium in the form of the species of VO2 + on the potassium alum surfaces.