In the industry of vanadium extraction from stone coal, one of the strategies used to tackle various problems caused by the production process is the implementation of cleaner production (CP). To ...
Hence, much attention has been paid to research on extracting vanadium from stone coal. The traditional high salt roasting-water leaching (HSRWL) technique is the earliest technique applied in ...
3. Results and discussion3.1.. RoastingIn stone coal, vanadium mainly fettered in crystal structure of roscoelite in the form of V(III), and V(III) could not be leached by NaOH until it is turned into oxide (V 2 O 5) (Xu, 1985).Therefore, the purpose of roasting was to make V(III) in stone coal turn into V 2 O 5.In this process, roasting temperature …
This study focuses on efficient green vanadium extraction of stone coal. A gradient oxidation roasting-acid leaching (GORA) process was proposed, which is additive-free and effectively improves the leaching efficiency with preliminary oxidation and further high-temperature reoxidation. The results of this study showed that 95.59 % of −0.074 ...
Vanadium was leached from roasted stone coal by NaOH solution, and the effect of leaching temperature, leaching time, addition of NaOH liquid to solid ratio, the …
The powdery V 2 O 5 product with 99.52% in V 2 O 5 content is obtained by the flowsheet of acid recovery, removing iron by reduction process, solvent extraction, …
It is very difficult to extract vanadium from stone coal. A new process for extracting vanadium from stone coal with sulfuric acid using sodium nitrate as leaching aid is proposed and studied. The … Expand
Low recovery rate,high energy consumption and serious pollution are existed in traditional processes of vanadium extraction.To seek a new process with high recovery rate,low energy consumption and less pollution discharge is of great significance.Microwave-aided roasting for vanadium extraction is an environmentally-friendly technology.Non …
In the direct acid leaching system of stone coal, a synergistic mechanism between sodium fluorosilicate and sodium chlorate has been observed. This mechanism …
vanadium in stone coal in China. Hence, the need for vanadium will continue to increase and it is acknowledged that meeting the world's increasing demand for vanadium can only be met by extracting vanadium from stone coal in the near future [3]. However, vanadium is always found in combination with various minerals [4] and, for the most part ...
The extraction technology of vanadium from stone coal by means of no-salt-roasting and dilute acid solution leaching treatment has the advantages of low pollution, low investment, as well as high vanadium leaching efficiency, which makes it the best technology for extending application. In the present study, the effects of vanadium …
DOI: 10.1016/J.FUEL.2014.10.068 Corpus ID: 94010749; Extraction of vanadium from stone coal by roasting in a fluidized bed reactor @article{Zeng2015ExtractionOV, title={Extraction of vanadium from stone coal by roasting in a fluidized bed reactor}, author={Xi Zeng and Fang Wang and Huifeng Zhang …
In this work, a two-stage roasting technology was presented to promote the vanadium leaching efficiency. The effects of roasting factors of two-stage roasting method on vanadium leaching rate and the mechanism of extracting vanadium from stone coal were studied. Phase transformation of minerals during roasting was analyzed with X-ray …
Stone coal (from Hunan province, China) was the vanadium source employed. The acidic leach solution was generated by direct leaching in 160 g/L H 2 SO 4 and 25 g/L HF solution at 90 °C, using a liquid-to-solid ratio of 2 mL/g and a reaction time of 6 h. The leach solution contained Fe(III), which has a negative influence on extraction …
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 …
PDF | On Jan 1, 2020, published Study on Extracting Vanadium from Stone Coal by Acid Leaching with Aid of Sodium Nitrate | Find, read and cite all the research you need on ResearchGate
The solvent extraction of vanadium from aqueous solution after the leaching of stone coal vanadium ore following low–temperature sulfation roasting was enabled by di-(2-ethylhexyl)phosphoric ...
This paper systematically summarizes the current vanadium extraction technology from converter vanadium slag, covering roasting, direct leaching, sub …
DOI: 10.1016/J.HYDROMET.2011.06.002 Corpus ID: 97163814; The technology of extracting vanadium from stone coal in China: History, current status and future prospects @article{Zhang2011TheTO, title={The technology of extracting vanadium from stone coal in China: History, current status and future prospects}, author={Yi-min Zhang …
If the vanadium compounds in stone coal exist in the amorphous Wang M.Y. et al., Effect of vanadium occurrence state on the choice of extracting vanadium technology from stone coal 115 phase form, the treatment of this type of stone coal by no-slat-roasting and dilute acid solution leaching constitutes a very efficient method, and …
The influence of roasting on the leaching rate and valence of vanadium was evaluated during vanadium extraction from stone coal. Vanadium in stone coal is hard to be leached and the leaching rate ...
The extraction technology of vanadium from stone coal by means of no-salt-roasting and dilute acid solution leaching treatment has the advantages of low pollution, low investment, as well as high ...
DOI: 10.1016/J.HYDROMET.2014.11.008 Corpus ID: 95158176; Solvent extraction of vanadium from a stone coal acidic leach solution using D2EHPA/TBP: Continuous testing @article{Xingbin2015SolventEO, title={Solvent extraction of vanadium from a stone coal acidic leach solution using D2EHPA/TBP: Continuous testing}, author={Li Xingbin and …
Besides, the ore containing vanadium in stone coal is always complicatedly combined with carbon, which further increases the difficulty for extracting vanadium form stone coal. China has started to extract vanadium from stone coal since 1960s, whose fundamental principle is oxidizing the acid- and water-insoluble V(III) to V(IV) and/or V(V ...
In this paper, the extraction of vanadium from stone coal by roasting with MgO and leaching with sulfuric acid has been investigated, and the mechanism analysis of stone coal roasting with MgO was ...
The mechanisms of aid-leaching reagent calcium fluoride in the extracting vanadium processes were researched by comparing the blank extraction with the extraction with calcium fluoride as aid-leaching reagent. The leaching experiments were carried out under the conditions of 95 °C, 6 h, 1.5 ml·g−1, 15 vol % H2SO4, and 5 % …
A new process of extracting vanadium from the stone coal vanadium ore in Fangshankou, Dunhuang area of Gansu Province, China was introduced. Various leaching experiments were carried out, and the ...
The effects of roasting factors of two-stage roasting method on vanadium leaching rate and the mechanism of extracting vanadium from stone coal were studied. Phase transformation of minerals during roasting was analyzed with X-ray diffraction (XRD). Microstructure change was studied using scanning electron microscope (SEM), energy …
