Study on Recycling Waste Water from V₂O₅ Extraction from the Stone Coal Leaching Solution

Experiments for recycling waste water from the process of V₂O₅ extraction from stone coal leaching solution are carried out in which a V₂O₅ extraction process of direct acid leaching and solvent extraction is employed using stone coal obtained from a certain area of Guangxi Province as raw materials.Impurities（Si,Fe and Al etc.） formed in leaching solution and their influence on process index and product quality during wastewater recycling process are investigated.Results show that the leaching rate of vanadium is not remarkably affected by utilization of the recycled residual solution from extraction.Si does not accumulate while Fe and Al accumulate to a certain extent and then stabilize during recycling process,which exerts no influence on recycling of the waste water.The vanadium pentoxide produced steadily can meet the requirements of GB3238-1987（V₂O₅-98）,which shows the product quality is not remarkably impacted by the recycling of residual solution.