脱硫石膏含水量对微波加热升温特性的影响  

Effect of Water Content in FDG Gypsum on Temperature Rising Characteristics under Microwave Heating

作　　者：郭宇[1] 陈津[1] 吉忠海 郭丽娜[1] 林万明[1] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024

出　　处：《有色金属（冶炼部分）》2016年第5期61-65,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金联合基金项目(51174252)

摘　　要：采用微波加热技术,研究了脱硫石膏中含水量对其升温特性的影响。结果表明,在微波加热的条件下,含水量25%的脱硫石膏比含水量20%和0%的脱硫石膏最终加热温度更高,升温过程分为快速升温阶段和温度平衡阶段。在配加无烟煤和磁铁矿的脱硫石膏混合物料中,含水量过多或过少都会阻碍高温区内温度的继续升高。脱硫石膏中含水会影响混合料中无烟煤的微波选择性加热和热点的产生,脱硫石膏中的含水量越少,无烟煤越早燃烧。当脱硫石膏含水量为20%时,无烟煤和热点不同时的升温会降低升温速率突然变化的可能性,防止热失控的产生,产生更好的升温效果。Effect of water content in FDG gypsum on temperature rising characteristics under microwave heating was investigated. The results show that final heating temperature of FDG gypsum with 25% water content is higher than those with 20% and 0% water content. For FDG gypsum matching with anthracite and magnetite, either too much or too little water content hinders continuous rise of temperature within high temperature zone. Water in FDG gypsum can affect microwave selective heating and generation of hotspot for anthracite in mixture. The less content is the earlier anthracite will burn. For FDG gypsum mixture with 20% water content, rise of temperature of anthracite and hotspot at different time reduces possibility of abrupt change of heating rate, which prevents generation of thermal runaway and with better heating effect.

关 键 词：脱硫石膏 微波加热 水含量 升温特性 

分 类 号：TQ177.375[化学工程—硅酸盐工业]