高密度多钒酸铵制备技术研究

介绍一种高密度多钒酸铵的制备方法,研究TV浓度、pH、搅拌速度、加药与酸温度、加铵系数以及晶种对多钒酸铵的堆密度和沉钒率的影响。研究结果表明:以含钒20～30 g/L的溶液在60～85℃加入大于1/50倍于全钒质量的晶种和1.5～2.5倍于全钒质量的硫酸铵后,用硫酸调节pH到2.1～2.4,沸水浴95℃依次在350 r/min和200 r/min转速下分别沉淀40 min和20 min,可获得98.5%以上的沉钒率,烘干后的APV堆密度大于0.95 g/cm3,APV焙烧后的粉钒中含V2O5大于98.5%,Na2O小于0.10%。

Study on the Preparation Technology of High-density APV

A new process to prepare high-density APV is introduced and the effects of TV concentration,pH value,stirring rate,temperature before adding reagent and acid,ammonium adding coefficient and seed crystal on bulk density and precipitation ratio of APV are investigated.The results show that following adding seed crystal with its mass more than 1/50 time that of TV and(NH4)2SO4 with its mass more than 1.5~2.5 times that of TV to the solution containing 20~30 g/L of vanadium between 60~85 ℃,and adjusting pH value of the solution to 2.1~2.4,the solution is precipitated for 40 min at 350 r/min and 20 min at 200 r/min in boiling water bath under 95 ℃.Precipitation ratio and bulk density of dried APV can reach above 98.5% and 0.95 g/cm3respectively.As a result,V2O5 powder contains more than 98.5% of V2O5 and less than 0.10% of Na2O after APV is roasted.