(中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 通過熱力學計算25℃時 體系在水溶液中的離子形態(tài)并繪制其隨pH、磷濃度變化的關系圖。為了模擬鎳鉬礦硫酸浸出液的液相環(huán)境，控制模擬料液中鉬的濃度在0.1mol/L左右，分析磷鉬摩爾比(n(P):n(Mo))為1:1、1:9、1:12、1:50時其熱力學平衡圖的變化規(guī)律。結果表面：隨著pH值的降低，鉬的存在形態(tài)分別是鉬酸根離子、磷鉬雜多酸根離子和同多鉬酸根離子。當氫離子濃度在0.1mol/L左右，隨著溶液中磷濃度的降低，鉬的存在形態(tài)由Dawson結構的 轉變成Keggin結構的 。
關鍵字: 系；磷鉬雜多酸；熱力學平衡；鎳鉬礦；萃取
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The thermodynamic diagrams of the ionic species were plotted at different pH values and phosphorus concentration in system at 25 ℃. To simulate the liquid phase environment of Ni-Mo ore leaching solution, the diagrams were plotted with different phosphorus-molybdenum molar ratios of 1:1, 1:9, 1:12 and 1:50 at certain molybdenum concentration of 0.1 mol/L. The results show that, as the pH value decreases, the species of molybdenum are molybdate anion, molybdophosphate anion and isopolymolybdate ion. As the phosphorus concentration decreases, the species of molybdenum is converted into Keggin-type from Dawson-type at certain hydrogen ion concentration 1 mol/L.
Key words: system; molybdophosphate; thermodynamic equilibrium; Ni-Mo ore; extraction
