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研究了用叔胺N235从石煤硫酸浸出液中萃取钒工艺,考察了萃取剂组成、萃原液p H值、萃取时间,反萃取剂组成、反萃时间等因素对萃取率及反萃率的影响,并探究了萃取与反萃过程中钒离子与杂质离子的分离效果。试验结果表明:对于钒质量浓度为1.89 g·L~(-1)的含钒酸浸液,用20%N235+5%TBP+75%磺化煤油作萃取剂,在p H为1.7、相比O/A=1∶3条件下萃取2 min,钒单级萃取率在90%以上,经过两级逆流萃取,钒的总萃取率达到98%以上;对于负载9.92 g·L~(-1)钒的有机相,用6%Na_2CO_3溶液作反萃剂反萃钒,控制相比O/A=3∶1,反萃时间4 min,钒的单级反萃率达58%,经过两级反萃取,钒的反萃率达到99%以上,同时与杂质离子有较好的分离效果,其中对铁、铝、镁的总去除率达到99%以上,对磷、硅的总去除率达到60%以上。该反萃液通过铵盐沉钒后所得五氧化二钒产品质量达到YB/T 5304-2011冶金98级标准。
The extraction process of vanadium from the leachate of stone coal with tertiary amine N235 was studied. The effects of extractant composition, p H value, extraction time, composition of stripping agent and stripping time on extraction yield and stripping efficiency were investigated. , And explored the separation effect of vanadium ions and impurity ions during extraction and stripping. The experimental results show that for vanadium-containing immersion liquid with mass concentration of vanadium (1.89 g · L -1), using 20% N235 + 5% TBP + 75% sulfonated kerosene as extractant, The total extraction rate of vanadium reached more than 98% after two-stage counter-current extraction. For the extraction of 9.92 g · L -1 (-1) ) Vanadium organic phase with 6% Na_2CO_3 solution as the stripping agent to stripping vanadium control, compared to O / A = 3: 1, stripping time 4 min, vanadium single-stage stripping rate of 58%, after two stages The stripping rate of vanadium reached more than 99% and the stripping efficiency was better than that of impurity ions. The total removal rate of iron, aluminum and magnesium reached more than 99%, and the total removal rate of phosphorus and silicon reached 60 %the above. The stripping solution vanadium pentoxide vanadium pentoxide obtained by vanadium precipitation after the ammonium sulfate solution has reached the standard of metallurgical grade 98 YB / T 5304-2011.