三聚氰胺沉钒试验研究

以钒渣钠化焙烧工艺得到的碱性钒净化液为原料,分析了溶液中V、Na以及杂质Si、P的含量,研究了三聚氰胺代替常规铵盐作为沉淀剂的酸性铵盐沉钒新工艺,并探讨了溶液中Na含量对沉钒效果的影响。结果表明:采用三聚氰胺沉钒,在沉钒剂用量n(C_3H_6N_6)/n(TV)=0.3、pH=2.0、沉钒温度90℃及沉钒时间45 min的条件下,沉钒率大于98%,得到的钒沉淀物经500℃煅烧3 h,可以获得满足标准的粉状V_2O_5,且沉钒废水中V和NH_4~+含量极低,简化了后续的废水处理工序。该工艺适合于nNa]/nV]≤5.0的溶液体系,试验效果良好。

Experimental Study on Precipitation of Vanadium Using Melamine

The purified alkaline vanadium solution obtained from the process of sodium roasting for vana dium slag was used as the raw material in this experiment,and the content of V and Na,and impurities content of Si and P were analyzed.A new process of vanadium precipitation under acidic condition was investigated using melamine as precipitant which substitutes for the ordinary ammonium agents such as ammonium sulfate and ammonium carbonate,etc.,and the effect of Na content in the solution on vanadium precipitation was also studied.The results show that powdery V2O5 satisfying the standard requirements is obtained after 3 hours of calcination at 500 ℃ with the precipitate as raw material,which is prepared at 0.3 of mole ratio of melamine to vanadium,pH=2.0,90 ℃ of precipitation temperature for 45 min.The precipitation rate of vanadium at the optimum conditions mentioned above is more than 98％,and the content of remaining vanadium and NH4+ in the wastewater keeps at an extremely low range,simplifying the subsequent treatment process for waste water.This method is suitable for the aqueous solution where n Na]/nV] ≤5.0 (mole ratio) and has an excellent test result.