Two-Stage Separation of V(IV) and Al(III) by Crystallization and Solvent Extraction from Aluminum-Rich Sulfuric Acid Leaching Solution of Stone Coal
Two-Stage Separation of V(IV) and Al(III) by Crystallization and Solvent Extraction from Aluminum-Rich Sulfuric Acid Leaching Solution of Stone Coal
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石煤富铝硫酸浸出液结晶和溶剂萃取两级分离V(IV)和Al(III)
DOI：
10.1007/s11837-016-2229-y
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发表时间：
2017-10
期刊：
影响因子：
2.6
通讯作者：
Liu Hong
中科院分区：
文献类型：
--
作者：
Shi Qihua;Zhang Yimin;Liu Tao;Huang Jing;Liu Hong
摘要
为提高石煤富铝硫酸浸出液中V（IV）和Al（III）的分离效果，开发了结晶-溶剂萃取两段分离方法。提出了共萃取系数k来综合评价不同溶液中共萃取的程度。在结晶阶段，68.2%的铝可以从溶液中除去。在溶剂萃取阶段，钒被选择性地提取使用二-2-乙基己基磷酸/磷酸三正丁酯从结晶母液，然后用H2SO 4有效地反萃。经氧化、沉淀、煅烧后得到纯度为98.39%、Al含量仅为0.10%的V2 O 5产品。与不结晶的溶液提钒相比，两级分离可使钒的逆流萃取级数由6级减少到3级，共萃取系数（k）由2.51降低到0.58。结果表明，结晶除铝可明显减弱铝共萃取对钒萃取的影响，提高溶剂萃取钒的选择性。
Abstract
To improve separation of V(IV) and Al(III) from aluminum-rich sulfuric acid leaching solution of stone coal, the two-stage separation by crystallization and solvent extraction methods have been developed. A co-extraction coefficient (k) was put forward to evaluate comprehensively co-extraction extent in different solutions. In the crystallization stage, 68.2% of aluminum can be removed from the solution. In the solvent extraction stage, vanadium was selectively extracted using di-2-ethylhexyl phosphoric acid/tri-n-butyl phosphate from the crystalline mother solution, followed by H2SO4 stripped efficiently. A V2O5 product with purity of 98.39% and only 0.10% Al was obtained after oxidation, precipitation, and calcination. Compared with vanadium extraction from solution without crystallization, the counter-current extraction stage of vanadium can be decreased from 6 to 3 and co-extraction coefficient (k) decreased from 2.51 to 0.58 with two-stage separation. It is suggested that the aluminum removal by crystallization can evidently weaken the influence of aluminum co-extraction on vanadium extraction and improve the selectivity of solvent extraction for vanadium.
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