Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal

Abstract

Abstract:The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium reacts with sodium salt to generate water-soluble sodium vanadate, some reacts with calcite in stone coal to form water-insoluble calcium vanadate, and other liberated vanadium exists as free vanadium oxide. However, for coarse muscovite grains, the reaction of muscovite converted to K-Na-feldspar only occurs at the outer margin of muscovite grains, and the vanadium in the interior of muscovite grains is not liberated. During water leaching, the sodium vanadate is leached out. The calcium vanadate and free vanadium oxide are dissolved out in the process of acid leaching, and the vanadium, presenting in muscovite grains surrounded by K-Na-feldspar, still remains in the acid leaching residue. Two suggestions, including optimization of grinding-classification process and adopting microwave roasting, were proposed for improving vanadium recovery according to the vanadium transition rules.

The Recovery of Vanadium Pentoxide (V2O5) from Spent Catalyst Utilized in a Sulfuric Acid Production Plant in Jordan

“…The absence of any noticeable change in Bragg peaks indicates that there are no major differences between the spent vanadium catalyst and the active catalyst in terms of the crystallographic structure. This result is comparable with the Zhang study that shows the Bragg diffraction of the V2O5/TiO2 catalyst [27]. Apparently, as expected, the catalyst loses its activity because of poisoning without any major change in its chemical structure.…”

A theoretical analysis of the vibrational modes of ammonium metavanadate

“…[38][39][40] The two main chemical methods currently used for the industrial extraction of V are the sodium roasting-water leaching process [9][10][11][12][13] and the calcium roasting-acid leaching process. [14][15][16][17][18] Based on our mode analysis, we propose the use of a high-power terahertz laser radiation at 711 cm −1 to assist in breaking the V-O bonds and separating V from NH 4 VO 3 . With the continuous progress of terahertz laser technology, this PPRA method could offer new application prospects.…”

“…Currently, there are various methods of extracting V directly from ores and secondary raw materials, including sodium roasting-water leaching V extraction [9][10][11][12][13] and calcication roasting-acid leaching V extraction. [14][15][16][17][18] However, these methods have disadvantages, such as causing pollution due to the use of various additives in the roasting and leaching processes and high costs. It is worth noting that China is one of the countries with the richest V mineral resources.…”

Research on the Identification Mechanism of Coal Gangue Based on the Differences of Mineral Components

“…According to the above analysis, it can be determined that the research on the intelligent sorting of coal gangue focuses on finding the image features of coal gangue under visible light, which is mainly reflected in the optimization of the training model and the diversification of image features. − There is less research on this fundamental difference between coal and gangue mineral components. To further develop the photoelectric separation technology of coal and gangue, the impact of thickness and density of single and mixed minerals on the gray value was studied via the regression equation of the gray value. − …”