(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中南大學(xué) 難冶有色金屬資源高效利用國家工程實(shí)驗(yàn)室，長沙 410083)
摘 要: 弱堿性陰離子交換樹脂(伯胺型)可從鎢酸鹽溶液中優(yōu)先吸附 ，且負(fù)載樹脂易于用NaOH解吸，但當(dāng)鎢酸鈉溶液中鉬含量較低時(shí)其對(duì)鉬的吸附容量很小。為提高其對(duì)鉬的吸附容量，研究鎢酸鈉溶液成分及硫化劑種類對(duì)鉬吸附行為的影響。結(jié)果表明：對(duì)于含93g/L WO3的鎢酸鈉溶液，鉬的吸附率和吸附容量隨料液中鉬濃度的增加而增大；相對(duì)于Na2S，以NaHS作為硫化劑可明顯降低溶液的平衡pH值，顯著改善鉬的硫化效果，從而更有利于鉬的吸附；對(duì)于含85 g/L WO3、7.6 g/L Mo、100 g/L Na2CO3的鎢酸鈉溶液，以NaHS作為硫化劑硫化后，經(jīng)動(dòng)態(tài)吸附得到的鎢酸鈉溶液中，WO3與Mo的質(zhì)量比達(dá)到1970:1，除鉬率達(dá)99.4%，鎢損失率僅為1.5%，鉬的吸附容量(單位體積的濕樹脂吸附的鉬的質(zhì)量)達(dá)31 mg/mL。經(jīng)1.0 mol/L NaOH溶液解吸后，鉬的解吸率達(dá)97.3%。
關(guān)鍵字: 鎢；鉬；離子交換樹脂；硫化；吸附
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. National Engineering Laboratory for Efficient Utilization of Refractory Nonferrous Metals Resources,
Central South University, Changsha 410083, China）
Abstract:Thiomolybdate ( ) has high affinity to alkalescent anion exchange resin (primary amine), and can be striped with NaOH solution easily, but the adsorption capacity of Mo is very low when Mo content in Na2WO4 solution is low. To increase the adsorption capacity of Mo, the effects of Na2WO4 composition of solution and the kind of sulfurizing reagent on the adsorption behavior of Mo were studied. The results show that the adsorption rate and adsorption capacity of Mo increases with increasing Mo concentration for Na2WO4 solution containing 93 g/L WO3. The sulfurizing reagent NaHS, as a alternative to Na2S, lowers the equilibrium pH value of solution and favors sulfurizing and adsorbing of Mo. The Na2WO4 solution containing 85 g/L WO3, 7.6 g/L Mo, 100 g/L Na2CO3 sulfurized with NaHS is adsorbed by means of column test, and mass ratio of WO3 to Mo of the elution before breakthrough reaches 1970:1, the removal ratio of Mo is 99.4%, the loss rate of WO3 is 1.5%, and the adsorption capacity of Mo is 31 mg/mL. The stripping ratio of Mo is 97.3% when the loaded resin stripped with 1 mol/L NaOH solution.
Key words: tungsten; molybdenum; anion exchange resin; sulfurizing; adsorption
