攀钢钒渣钙化焙烧酸浸液沉钒试验

为了揭示攀钢钒渣钙化提钒工艺酸浸液直接沉钒的一般规律,确定合适沉钒工艺技术参数,以3种不同钒、磷浓度的酸浸液及其混合配制液为对象,研究了沉钒液钒磷浓度比、钒浓度、初始pH值对沉钒率和V2O5产品质量的影响。结果表明:①沉钒液钒磷浓度比升高,沉钒率上升、V2O5产品磷含量下降。②钙化工艺对沉钒液磷浓度的要求更宽松,在钒磷浓度比大于767、磷浓度小于0.042 g/L情况下的沉钒效果与钠化提钒工艺钒磷浓度比大于1 100、磷浓度小于0.015 g/L情况下的沉钒效果相当。③沉钒液钒浓度越低越不利于沉钒,适宜的沉钒初始浓度为32~40 g/L,当沉钒过程中上清液的pH2.5时应采取二次补酸、加热、沉钒措施来提高沉钒效果。④对于钒磷浓度比≥767(磷浓度≤0.042 g/L)的沉钒液,在沉钒初始pH=2.0左右时,沉钒率达99.5%以上,V2O5产品的V2O5含量大于98.5%,磷含量低于0.016%。

Vanadium Precipitation Tests for Pickle Liquor of Calcific-Roasting Vanadium Slag of Pangang

In order to reveal the universal law of direct vanadium precipitation from acid leaching solution of Pangang vanadium slag，and determine the appropriate technological parameters of precipitation，the effects of ratio of ［V］/［P］，［V］，initial pH value on precipitation rate and the quality of V₂O₅ products were studied with acid leaching solutions in three different ［V］ and ［P］ concentration and their mixtures as object.The results showed that：①As the concentration ratio of ［V］/［P］ increases，the precipitation rate rises，and P content decreases in V₂O₅ products.②The requirement for ［P］ in leaching solution of calcium roasting process is lower.With ［V］/［P］ greater than 767 and ［P］ less than 0.042 g/L，the vanadium precipitation in calcium roasting process is the same as that in sodium roasting process with ［V］/［P］ greater than 1 100 and ［P］ less than 0.015 g/L.③The lower ［V］ in leaching solution is the lower of precipitation ratio.The optimal initial concentration for vanadium precipitation is between 32~40 g/L，as the pH of the supernatant is greater than 2.5，replenish of acid，heating，precipitating should be taken to improve the efficiency.④When the initial pH is about 2.0 and ［V］/［P］ is greater than 767(or ［P］ is less than 0.042 g/L)，the precipitation rate can reach more than 99.5%，and V₂O₅ content will be greater than 98.5% with less than 0.016% of P respectively.