(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083;
2. 稀有金屬冶金與材料制備湖南省重點實驗室，長沙 410083)
摘 要: 針對目前黑鎢礦堿法分解工藝中存在的反應(yīng)溫度高、生產(chǎn)效率低等問題，開發(fā)了一種黑鎢礦堿分解新工藝，以雙螺桿擠出機(jī)為反應(yīng)器，采用反應(yīng)擠出法對高黏度黑鎢礦的堿分解過程進(jìn)行了研究，系統(tǒng)考察浸出時間、溫度、螺桿轉(zhuǎn)速和堿用量對鎢礦浸出效果的影響。在礦水質(zhì)量比為2.67:1、堿用量為理論量的1.5倍、溫度為120 ℃，螺桿轉(zhuǎn)速為180 r/min和反應(yīng)時間為2.5 h的條件下，浸出渣中WO3的含量為2.54%，鎢礦的浸出率達(dá)99.13%。
關(guān)鍵字: 反應(yīng)擠出法；雙螺桿擠出機(jī)；黑鎢礦；氫氧化鈉
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Hunan Key Laboratory for Metallurgy and Material Processing of Rare Metals, Changsha 410083, China）
Abstract:A novel process was proposed to solve the current disadvantages of high reaction temperature and low productivity in the process of NaOH digestion of wolframite. With a reactor of twin screw extruder, the process of sodium hydroxide digestion of high-viscosity wolframite by reactive extrusion was investigated. The effects of leaching time, temperature, screw rotating speed and NaOH dosage on digestion of wolframite were systematically evaluated. Under the conditions of mass ratio of ore to water 2.67:1, NaOH dosage 1.5 times to stoichiometry, temperature 120 °C, screw rotating speed 180 r/min and reaction time 2.5 h, the content of WO3 in the residue and the WO3 extraction are 2.54% and 99.13%, respectively.
Key words: reactive extrusion method; twin screw extruder; wolframite; sodium hydroxide
