(1. 中南大学 冶金科学与工程学院，长沙 410083;
2. 稀有金属冶金与材料制备湖南省重点实验室，长沙 410083)
摘 要: 针对目前黑钨矿碱法分解工艺中存在的反应温度高、生产效率低等问题，开发了一种黑钨矿碱分解新工艺，以双螺杆挤出机为反应器，采用反应挤出法对高黏度黑钨矿的碱分解过程进行了研究，系统考察浸出时间、温度、螺杆转速和碱用量对钨矿浸出效果的影响。在矿水质量比为2.67:1、碱用量为理论量的1.5倍、温度为120 ℃，螺杆转速为180 r/min和反应时间为2.5 h的条件下，浸出渣中WO3的含量为2.54%，钨矿的浸出率达99.13%。
关键字: 反应挤出法；双螺杆挤出机；黑钨矿；氢氧化钠
（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
