بازيابي واناديوم از سرباره كنورتور فولادسازي به روش تشويه نمكي

Recovery of Vanadium from Steel Making Converter Slag

A salt roasting-water leaching process was adopted for the recovery of vanadium from steel making converter slag produced at Isfahan steel plant. A mixture of slag and sodium carbonate was pelletized and roasted under various conditions. The effects of roasting parameters such as temperature, sodium carbonate content of the mixture, particle size, oxygen content of gas atmosphere and time were studied. The highest efficiency . of roasting was achieved at 850°C with salt (sodium carbonate) to slag weight ratio of 0.5 and slag powder particle size of - 246miu m. It was observed that the oxygen partial pressure in gas atmosphere has a little effect on the roasting efficiency. This observation is in accordance with the form of vanadium in the slag which is in pentavalent state as revealed by XRD analysis. To . extract vanadium compounds, the roasted products were leached in hot water under optimum conditions reported in the litreture. Vanadium compounds were precipitated from the solution and was analysed by XRD and XRF techniques where in Beta-Na4V207 and V304 detected.