Research on Application of Acidic Precipitation of Vanadium with Ammonium Salt in the Solution Containing Vanadium and Chromium
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摘要: 以钒渣钠化焙烧工艺得到的碱性钒浸出液为原料,在除去主要杂质硅和磷后,通过添加硫酸钠和三氧化铬,配制成一定组分的钒铬溶液,采用典型的酸性铵盐沉钒工艺,考察了溶液中钠、铬、钒含量以及加铵系数对沉钒率及最终V2O5中Na2O含量的影响。结果表明:钒铬溶液在一定的浓度范围内可以采用酸性铵盐沉钒工艺,并取得较好效果。在满足高沉钒率及V2O5产品质量合格的前提下,溶液中钠的最大允许浓度为c(Na)/c(V)=2.4;在c(Na)/c(V)=1.8时,随着溶液钒浓度的增加,铬的最大允许浓度发生变化,表现为c(Cr)/c(V)逐步减小;对c(V)=25 g/L、c(Na)=45 g/L、c(Cr)=24 g/L的溶液浓缩后进行沉钒,通过降低浸出液固比提高钒浓度,钒的最大允许浓度为26 g/L;当加铵系数在1.5以上时,获得的V2O5产品满足相关质量要求;溶液离子浓度及加铵系数对沉钒率的影响很小。Abstract: The alkaline solution containing vanadium was used as the raw material,which was from the process of sodium roasting for vanadium slag.After the removal of silicon and phosphorus from the solution,sodium sulfate and chromic anhydride were added into the solution to prepare vanadium and chromium containing solution with a fixed composition.Then,the representative process for acidic precipitation of vanadium with ammonium salt was adopted to investigate the impacts of sodium,chromium and vanadium contents in the vanadium and chromium containing solution as well as the ammonium addition coefficient on the precipitation rate of vanadium and Na2O content in the obtained V2O5.The results show that it is feasible to apply the acidic precipitation of vanadium with ammonium salt to the solution containing vanadium and chromium in a certain concentration range,which can achieve desirable effects.On the precondition of satisfying the high vanadium deposition rate and qualified products,the maximum permissible concentration of sodium in the solution is determined at c(Na)/c(V)=2.4(the content ratio of sodium to vanadium).As the concentration of vanadium increases,the maximum permissible concentration of chromium in the solution changes with c(Cr)/c(V)(content ratio of chromium to vanadium) gradually decreasing at c(Na)/c(V)=1.8.The solution containing 25 g/L of vanadium,24 g/L of chromium and 45 g/L of sodium was concentrated for vanadium precipitation,and the results indicate that a maximum 26 g/L of vanadium can be permitted for the increase of vanadium concentration via reducing the liquid to solid ratio in the leaching process.The obtained V2O5 meets the relevant quality requirements with ammonium addition coefficient of 1.5.Few influences of ions concentration and ammonium addition coefficient were found on the vanadium precipitation rate.This study can provide the guidance for vanadium precipitation in the solution containing vanadium and chromium.
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