Feasibility Study on Vanadium Precipitation with(NH4)2SO4-Na2SO4 Mixed Salt
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摘要: 研究了（NH4）2SO4-Na2SO4混合盐用于酸性铵盐沉钒的可行性，研究结果表明，w Na2SO4/w （NH4）2SO4≤0.3时，沉钒率为98.9%~99.3%，沉淀物（APV）洗涤后，TV 49.85%~50.43%、Na2O 0.11%~0.51%、S 0.100%~0.448%，K2O 0.11%~0.12%，混合盐中Na2SO4含量未对沉钒过程及沉淀物成分造成显著影响。采用SEM、EDS分析沉淀物，推测Na+、SO42-以表面吸附的方式存在于沉淀物表面，K+可能作为晶核或构晶离子生成混合晶体存在于沉淀物中。废水蒸发浓缩结晶残液制备的（NH4）2SO4-Na2SO4混合盐酸性沉钒试验结果表明，沉淀物经洗涤后可满足生产要求，试验结果验证了用废水蒸发浓缩结晶残液制备的混合盐用于酸性铵盐沉钒的可行性。Abstract: In this paper,the feasibility of vanadium precipitation with(NH4)2SO4-Na2SO4 mixed salt is studied.The results indicate that vanadium precipitation ratio is at 98.9%~99.3% as the mass ratio of(NH4)2SO4to Na2SO4 ≤ 0.3.With TV percentage of 49.85%~50.43%,Na2O of 0.11%~0.51%,S of 0.100%~0.448%,and K2O of 0.11%~0.12% after washing of precipitate(APV),it can be found out that Na2SO4 content in the mixed salt has little influence on the precipitating process and precipitate compositions.Through precipitate analyzing by SEM and EDS,it can be assumed that Na+ and SO42- may exist on the surface of precipitates in a way of surface adsorption,and K+may exist in the precipitate as crystal nucleus or crystal structural ion.The result of the experiment for vanadium precipitation with(NH4)2SO4-Na2SO4 mixed salt prepared by concentration of residual liquid of crystallization show that after washing,the precipitate can meet the production requirements.
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