DOC《doi:10》

doi:10.

3969/j.issn.1007-7545.2019.03.009 微波焙烧辉钼矿制备三氧化钼研究 蒋永林1,2,3,刘秉国1,2,3,曲雯雯1,2,3,宇文超1,2,3 (1.微波能工程应用及装备技术国家地方联合工程实验室,昆明 650093;

2.昆明理工大学 非常规冶金省部共建教育部重点实验室,昆明 650093;

3.昆明理工大学 冶金与能源工程学院,昆明 650093) 摘要:对辉钼矿在微波场中的升温特性进行了研究,考查物料厚度、物料量和温度对产品得率的影响.结果表明,辉钼矿具有良好的吸波特性;

随着物料厚度的增加,产品得率先增加后减小,物料量增大时产品得率增大,而温度提高时,得率先增加后减小.微波焙烧辉钼矿制备三氧化钼的最佳条件为:物料厚度3 cm、物料量60 g、温度为800 ℃.升高温度,产品晶体的纯度提升,晶体成型更为明显,结构更为规整.微波焙烧辉钼矿制备三氧化钼是可行的. 关键词:微波;

辉钼矿;

产率;

MoO3 中图分类号:TF841.2 文献标志码:A 文章编号:1007-7545(2019)03-0000-00 Study on Preparation of Molybdenum Trioxide from Molybdenite by Microwave Roasting JIANG Yong-lin1,2,3, LIU Bing-guo1,2,3, QU Wen-wen1,2,3, YU Wen-chao1,2,3 (1. National Local Joint Engineering Laboratory of Engineering Applications of Microwave Energy and Equipment Technology, Kunming 650093, China;

2. Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China;

3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China) Abstract:Temperature rising properties of molybdenite in microwave field were studied. Effects of material thickness, material mass and temperature on product yield were discussed. The results indicate that molybdenite has good microwave absorption properties. Product yield rises first and drops later with increase of material thickness and temperature. Product yield rises with increase of material mass. The optimum preparation conditions include material thickness of

3 cm, material mass of

60 g, and temperature of

800 ℃. Increasing temperature is favorable to improve product purity with more obvious crystal forming and more regular crystal structure. It is feasible to prepare molybdenum trioxide crystal from molybdenite by microwave roast. Key words:microwave;

molybdenite;

yield;

MoO3 三氧化钼是一种由[MoO6]八面体单元连接而成[1-2]的过渡金属氧化物,广泛应用于超导体[3]、光电元件[4]、催化剂[5]、功能材料[6]等领域.工业上生产三氧化钼的方法主要有酸浸―铵盐沉淀―煅烧法和升华法.前者工艺复杂、浸出废液易对环境造成污染[7];

后者尽管工艺简单、流程短,但产品质量难控制.微波加热作为一种绿色高效的加热方法[8-13],升温速率快,可选择性加热物料,且加热效率高,已经在工业上得到应用.因此我们将微波用于辉钼矿焙烧生产三氧化钼,本文主要从辉钼矿在微波场中的升温特性出发,探讨微波场中各因素对三氧化钼产品得率的影响.

1 试验部分 1.1 原料和设备 试验所用辉钼矿为江苏某公司提供,化学成分(%):Mo 44.

64、S 28.

17、SiO2 11.

37、Cu 0.

92、CaO 0.

90、Pb 0.16.可以看出,原料的主要元素为钼和硫,其次是钙和硅等杂质元素的氧化物,另外含有金属铅和铜等. 原料经XRD和SEM分析可知,辉钼矿的主要物质形态为MoS2,同时夹杂部分二硫化钨和金属卤化物等杂质,呈不规则的块状和大颗粒状,大小在100 μm左右. 收稿日期:2018-12-01 基金项目:国家自然科学基金资助项目(51564033);