Application of Microwave Melting for the Recovery of Tin Powder

作     者：Lei Xu Jinhui Peng Hailong Bai C. Srinivasakannan Libo Zhang Qingtian wu Zhaohui Han Shenghui Guo Shaohua Ju Li Yang 

作者机构：Faculty of MetaUurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Kunming 650093 China Yunnan Tin Croup (Holding) Company Limited Gejiu Yunnan 661000 China Chemical Engineering Program The Petroleum Institute P.O. Box 2533 Abu Dhabi United Arab Emirates 

出 版 物：《Engineering》 (工程（英文）)

年 卷 期：2017年第3卷第3期

页      面：423-427页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：this work was financially supported by the national natural science foundation of china the china scholarship council the yunnan provincial science and technology innovation talents scheme-technological leading talent of china the major project of applied basic research of yunnan province the scientific research fund of yunnan provincial department of education 

主　　题：Microwave heating Melting Tin powder Microwave equipment Recovery 

摘      要：The present work explores the application of microwave heating for the melting of powdered tin. The mor- phology and particle size of powdered tin prepared by the centrifugal atomization method were charac- terized. The tin particles were uniform and spherical in shape, with 90% of the particles in the size range of 38-75μm. The microwave absorption characteristic of the tin powder was assessed by an estimation of the dielectric properties. Microwave penetration was found to have good volumetric heating on powdered tin. Conduction losses were the main loss mechanisms for powdered tin by microwave heating at temperatures above 150 ℃. A 20 kW commercial-scale microwave tin-melting unit was designed, developed, and utilized for production. This unit achieved a heating rate that was at least 10 times higher than those of conventional methods, as well as a far shorter melting duration. The results suggest that microwave heating accelerates the heating rate and shortens the melting time. Tin recovery rate was 97.79%, with a slag ratio of only 1.65% and other losses accounting for less than 0.56%. The unit energy consumption was only 0.17 （kW·h）·kg-1- far lower than the energy required by conventional melting methods. Thus, the microwave melting process improved heating efficiency and reduced energy consumption.