2O酸性溶液體系中，pH=1~4時VO2+首先轉(zhuǎn)變?yōu)榱租C雜多酸陰離子，pH=4~7時磷釩雜多酸陰離子轉(zhuǎn)變?yōu)橥嗨彡庪x子；在S(VI)-V(V)-H2O酸性溶液體系中，pH=0~1時釩主要以VO2+和 VO2SO4-形式存在，pH=2~6時釩逐漸轉(zhuǎn)變?yōu)橥嗨彡庪x子；在P(V)-S(VI)-V(V)-H2O酸性溶液體系中，pH=1~3 時VO2+和 VO2SO4-逐漸轉(zhuǎn)變?yōu)榱租C雜多酸陰離子，當pΗ=2時ΣPV14（所有磷釩雜多酸陰離子之和）的摩爾分數(shù)最大為88.55%；pH=4~6 時，磷釩雜多酸陰離子消失并逐漸轉(zhuǎn)變?yōu)橥嗨彡庪x子，當pΗ=5時ΣV10（所有同多酸陰離子之和）的摩爾分數(shù)最大為100.00%。;To extract vanadium efficiently from the acidic leachate of vanadium slag, a thermodynamic analysis of phosphorus-sulfur-vanadium-water acidic systems was established at 298 K. Results show that in the P(V)-V(V)-H2O acidic system, VO2+ is first conver-ted to phosphovanadic heteropolyacid ions when pH=1~4 and then converted to vanadium isopolyacid ions when pH=4~7. In the S(VI)-V(V)-H2O acidic system, VO2+ and VO2SO4- are the main existing chemical forms when pH=0~1 and gradually converted to vanadium isopolyacid ions when pH=2~6. In the P(V)-S(VI)-V(V)-H2O acidic system, when pH=1~3, VO2+ and VO2SO4- are gradua-lly converted to phosphovanadic heteropolyacid ions. The optimum molar fraction of ΣPV14 (total sum of phosphovanadic heteropolyacid ions) reaches 88.55% at pH=2. As the pH value increases to 4~6, phosphovanadic heteropolyacid ion gradually disappears and is converted to vanadium isopolyacid anions, and the optimum molar fraction of ΣV10 (total sum of vanadium isopolyacid ions containing ten vanadium) is 100.00% at pH=5."/>