钒化工流程高效提取钒元素

High Efficiency Leaching of Vanadium in Vanadium Chemical Process

进行了强碱浸出钒渣焙烧熟料实验及钒化工固体废料(脱硅渣、钒酸铁泥、二次渣)混料低碱量焙烧实验,以提高现有钒渣钠化焙烧工艺钒浸出率.结果表明,钒相被赤铁矿相(Fe_2O_3)、板钛矿相(Fe_2TiO_5)及锥辉石相[NaFe(SiO_3)_2]包裹,强碱浸出钒渣钠化焙烧熟料工艺中NaOH浓度为10 g/L时,钒浸出率高达83.15%,过滤效率提高12%;二次渣配脱硅渣后加NaOH或Na_2CO_3焙烧均可高效浸出钒,尾渣含钒仅为0.57%;混渣采用混碱(Na_2CO_3和NaOH复合添加剂)焙烧提钒,钒酸铁泥配加量在8%以下时,二次渣配钒酸铁泥加Na_2CO_3焙烧可高效浸出钒,尾渣含钒仅为0.68%.

In order to improve the leaching rate of vanadium in the existing sodium roasting of vanadium slag process, strong alkali leaching of roasted clinker and roasting mixed vanadium chemical solid waste （desiliconized slag, ferric vanadate and secondary slag） under a small quantity of alkalis was carried out. The results showed that vanadium-bearing mineral is maily wrapped by phases hematite （Fe2O3）, pseudobrookite （Fe2TiOs） and acmite [NaFe（SiO3）2]. When the concentration of NaOH was 10 g/L in strong alkali leaching of roasted clinker process, the leaching rate of vanadium is higher, up to 83.15%, and the filter efficiency increased by 12%. High efficiency leaching of vanadium can be achieved by adding NaOH or Na2CO3 to the mixture of desiliconized slag and secondary slag and roasting, vanadium content in railings is only 0.57%. Roasting mixed slag with mixed alkali （Na2CO3 and NaOH composite additives） was employed. When the dosage of ferric vanadate is less than 8%, high efficiency leaching of vanadium can be achieved by adding Na2CO3 to the mixture of ferric vanadate slag and secondary slag and roasting, vanadium content in tailings is only 0.68%.