Effect of Recycling Waste Water on Producing Clean Vanadium Oxide Using Dilute Sulfuric Acid Leaching Method

To solve problems that recycling wastewater pH、SS、Mn²⁺、NH₄⁺ concentration change greatly to cause vanadium precipitation and low yield of vanadium during calcified roasting clinker leaching with sulfuric acid and ammonium salt precipitation of vanadium process in clean production,the effect of recycling wastewater pH、SS、Mn²⁺、NH₄⁺ concentration on immersion ratio of vanadium was studied using the method of sulfuric acid leaching by taking wastewater and roasting clinker as raw material. Meanwhile,compare the wastewater with deionized water to leaching-filtering-washing effect were studied. The results show that with the increase of wastewater pH,acid leaching residue of vanadium content decreases,vanadium leaching rate increases and with increasing recycling wastewater SS、Mn²⁺、NH₄⁺ concentration,acid leaching residue of vanadium content increased,vanadium leaching rate decreased sharply. Recycling wastewater and deionized water to leaching-filtering-washing effect is similar to that of acid leaching residue of vanadium content can be reduced to 1.2%,vanadium leaching rate can be achieved 85% when recycling wastewater of pH = 6.5~7.5,Mn²⁺≤3 g/L,SS≤30 g/L,NH₄⁺≤25 g/L. The experimental results provide the technical control requirements and data reference for the wastewater treatment and recycling of the industrial waste water in the process of producing clean vanadium from the calcified roasting clinker sulfuric acid leaching and ammonium salt precipitation vanadium.