(中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 針對(duì)鎢冶煉過(guò)程中鎢鉬分離這一關(guān)鍵問(wèn)題，研究了利用CuS, CoS, NiS, PbS, FeS, ZnS和HgS等金屬硫化物從鎢酸鹽溶液中除鉬的效果。對(duì)含鉬的Na2WO4或(NH4)2WO4溶液用Na2S或(NH4)2S 進(jìn)行硫化處理，使其中的MoO42-轉(zhuǎn)化為MoS42-，然后加入上述金屬硫化物進(jìn)行除鉬。 結(jié)果表明， CuS， CoS和NiS在Na2WO4或(NH4)2WO4溶液中均具有良好的除鉬效果，綜合考慮經(jīng)濟(jì)、 環(huán)保等因素， 認(rèn)為CuS是最經(jīng)濟(jì)合理的鎢鉬分離新試劑。考察了試劑用量、 反應(yīng)溫度和溶液pH值對(duì)除鉬效果的影響，并獲得了最佳除鉬工藝條件， 即在CuS試劑用量為理論量的3~4倍、 室溫下攪拌反應(yīng)1h的條件下， 可使溶液中的Mo從0.6~0.77g/L降至0.007~0.02g/L， 除鉬率達(dá)96.0%~98.5%， 整個(gè)除鉬過(guò)程中鎢的回收率達(dá)99.75%以上。
關(guān)鍵字: 鎢鉬分離； 金屬硫化物； 硫化； 鎢冶金
LI Hong-gui, SUN Pei-mei, LI Yun-jiao
（ College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The effect of removing molybdenum from tungsten solution by using metal sulfides, such as CuS, CoS, NiS, PbS, FeS, ZnS and HgS, was studied. After the molybdenum contained in Na2WO4 or (NH4)2WO4 solution was sulfurized from MoO42- into MoS42- by using Na2S or (NH4)2S, the metal sulfide was added into the solution to remove MoS42-. It is shown that CuS, CoS and NiS are very effective for removing Mo from Na2WO4 or (NH4)2WO4 solution. Considering the economic and environmental protection factors, CuS is considered as the proper reagent of removing Mo. The effects of the amount of metal sulfide used, the pH of solution and temperature on removing Mo from tungstate solution were studied. Under the optimum conditions, the Mo concentration can be reduced from 0.6-0.77g/L to 0.007-0.02g/L, the efficiency of de-molybdenum is 96.0%-98.5%, and the recovery of tungsten reaches 99.75% in this process.
Key words: removing molybdenum from tungstate; metal sulfide; sulfuration; tungsten metallurgy
