CAJ | 학술논문

通过热力学计算绘制25℃时W(Ⅵ)-V(Ⅴ)-H2O系中存在的离子随pH、钨、钒浓度变化的热力学平衡图，并总结其变化规律。通过热力学分析，从理论上寻找到钨、钒在混合溶液中存在形式上的差异，并据此提出钨钒分离的技术路线。钒形成聚合离子的能力强于钨。在pH约为8.5~9.0的条件下，溶液中绝大部分的钒以聚合离子形式存在，而钨则几乎全部为单核离子，利用该差异通过合理的分离手段即可实现二者的有效分离；而在钨、钒浓度均较低时，体系会在pH较低的条件下形成VO2+离子，而此时钨的存在形式全部为阴离子，因而，采用阳离子萃取剂或阳离子树脂可望选择性地将VO2+从溶液中分离。
통과열역학계산회제25℃시W(Ⅵ)-V(Ⅴ)-H2O계중존재적리자수pH、오、범농도변화적열역학평형도，병총결기변화규률。통과열역학분석，종이론상심조도오、범재혼합용액중존재형식상적차이，병거차제출오범분리적기술로선。범형성취합리자적능력강우오。재pH약위8.5~9.0적조건하，용액중절대부분적범이취합리자형식존재，이오칙궤호전부위단핵리자，이용해차이통과합리적분리수단즉가실현이자적유효분리；이재오、범농도균교저시，체계회재pH교저적조건하형성VO2+리자，이차시오적존재형식전부위음리자，인이，채용양리자췌취제혹양리자수지가망선택성지장VO2+종용액중분리。
The thermodynamic equilibrium diagrams were drawn for the distribution of species at different pH and concentrations in the W(Ⅵ)-V(Ⅴ)-H2O system at 25 ℃. The difference of existing forms between W and V in the mixed solution was found by the theoretical analysis, and accordingly the technical routes for separation of W and V were presented. The results show that the polymeric ability of VO43-is stronger than that of WO42-. At the pH range of 8.5-9.0, most of VO43-transform to polymeric anions, while almost all W ions still exist as the form of monomeric WO42-. This difference makes it possible that W and V can be separated efficiently by a proper method. In the solution with low concentration of W and V, VO2+ ions are formed under low pH conditions, while W ions exist as the form of anions. Consequently, VO2+ions can be selectively separated by the cation extraction agent or exchange resin.