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以钒反萃取液(主要成分五氧化二钒浓度99.30 g/L,铁浓度3.15 g/L)为原料,研究了钒反萃取液酸度、沉钒pH值、溶液电位等条件对沉钒率和产品五氧化二钒质量的影响。试验结果表明:针对含铁较高的上述钒反萃取液,为了获取优质五氧化二钒产品,沉钒分二段进行。第一段沉钒是先用硫酸调整钒反萃液酸度为1.5 mol/L,60℃水浴下加氯酸钠,控制溶液电位为1 000 mV,用15%的氨水调pH值在0.5以内,90℃下搅拌1 h,该段沉钒率为85%,其产品五氧化二钒含量达99%以上,铁含量在0.3%以下。第二段沉钒是将上述滤液接着用氨水调pH值至2.0并于90℃下搅拌1 h,两段总沉钒率达99%,第二段沉钒产品铁含量达1.5%,需后处理,经30%氢氧化钠溶液除铁后再次沉钒,其产品五氧化二钒含量达99%以上,铁含量在0.1%以下。
The vanadium stripping solution (the main component vanadium pentoxide concentration of 99.30 g / L, the iron concentration of 3.15 g / L) as raw materials, vanadium stripping extract acidity, vanadium pH, solution potential and other conditions Shen vanadium rate and The impact of vanadium pentoxide quality on the product. The test results show that for the above vanadium stripping solution with higher iron content, Shen vanadium is divided into two sections in order to obtain good vanadium pentoxide products. The first paragraph Shen vanadium is first adjusted with sulfuric acid vanadium stripping solution acidity of 1.5 mol / L, 60 ° C water bath sodium hypochlorite control solution potential of 1 000 mV with 15% aqueous ammonia to adjust the pH value within 0.5, 90 ° C for 1 h, the vanadium deposition rate of 85%, vanadium pentoxide content of more than 99%, iron content below 0.3%. The second paragraph Shen vanadium is the filtrate was then adjusted to pH 2.0 with ammonia and stirred at 90 ℃ for 1 h, the total vanadium deposition rate of 99%, the second paragraph of vanadium content of 1.5% Treatment, after 30% sodium hydroxide solution again vanadium precipitation Shen vanadium pentoxide content of more than 99%, iron content below 0.1%.