低品位钛铁矿的介电特性和微波加热特征.docVIP

PAGE PAGE 12 电焊条用钛铁矿的介电特性及微波加热特征 刘晨辉1,2 ，彭金辉1,2，*, 李欣雨3, 张利波1,2 ,蒋勇3 ,郭胜惠1,2 （1基金项目：国家自然科学基金重大项目（外场对钒钛组元迁移及分离的强化与协同作作者简介： 刘晨辉, 男，博士生，主要从事微波冶金方面研究，Email:liu-chenhui@通讯作者: 基金项目：国家自然科学基金重大项目（外场对钒钛组元迁移及分离的强化与协同作 作者简介： 刘晨辉, 男，博士生，主要从事微波冶金方面研究，Email:liu-chenhui@ 通讯作者: 彭金辉（1964-），彝族，教授，博导，主要从事非常规冶金，资源综合利用方面的研究。Email: jhpeng@ 摘要：电焊条用含钛原料的介电特性研究对于拓宽焊条产生原料来源和发展微波加热制备还原钛铁矿具有重要的指导意义。采用同轴探头反射法测定了钛铁矿粉末（含TiO2 38%～47%）在2.45 GHz频率下和20～80 ℃之间的介电特性，并测定钛铁矿在微波场下的温升特性。研究结果表明：钛铁矿的介电常数和介电损耗因子及损耗角正切随着温度的上升而增加，介电特性总体随着含钛品位增高逐渐增强。钛铁矿的穿透深度在40～80 ℃之间随温度增加逐渐降低，微波加热钛铁矿的最佳物料厚度为3～6 cm。微波场下钛铁矿的升温曲线表明温度和微波加热时间具有一个非线性关系。 关键词：介电特性；钛铁矿；微波加热；穿透深度； 中图分类号：TF19 文献标志码：A Dielectric properties and microwave heating characteristics of ilmenite for welding LIU Chen-hui1,2, PENG Jin-hui1,2*, LI Xin-yu3, ZHANG Li-bo1,2, JIANG Yong3, GUO Sheng-hui1,2, National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, 650093, China; 2. Key Laboratory of Unconventional metallurgy,Ministry of Education, Kunming 650093，China; 3. Sichuan Atlantic Welding Consumable CO., LTD,643000,China) Abstract: The knowledge of dielectric properties of ilmenite ore for welding electrode is essential for widening the electrode produce preparation raw material sources and the development of microwave reduction ilmenite. In this study, the dielectric properties of ilmenite with different TiO2 content at 2.45GHz in the temperatures from 20 °C up to 80 °C was measured using the technology of open-ended coaxial sensor method. The temperature increase characteristic was also measured. The results show that dielectric constant, loss factor and loss tangent of the ilmenite increase significantly with temperature. Dielectric properties of ilmenite increase with increasing in TiO2 content overall. The penetration depth of ilmenite decreases with temperature increase between 40 °C and 80 °C, the best thickness of microwave heating ilmenite is 3～6 cm. The increase in the s