CaCO_3悬浮液热压过滤干燥实验研究  

Experimental study on thermo-compression filtration-drying of CaCO_3 suspension

作　　者：李秀丽[1] 周明远[1] 樊丽[1] 

机构地区：[1]上海第二工业大学城市建设与环境工程学院,上海201209

出　　处：《化学工程》2013年第9期27-30,44,共5页Chemical Engineering(China)

基　　金：上海市教育委员会重点学科建设项目(电子产品与环境工程)(J51803);上海第二工业大学培育学科建设(环境工程)(XXKPY1303)

摘　　要：碳化法生产所得超细CaCO3浆体需经机械过滤和二级热力干燥才能得到粉体产品,工艺复杂,能耗较大。为简化传统生产工艺,采用热压过滤干燥固液分离技术进行超细CaCO3悬浮液的脱水干化研究。通过对热压过滤干燥固液分离技术的原理分析和理论研究,设计小型热压过滤干燥装置,并确定影响CaCO3热压干燥效果的主要因素为滤饼厚度、热压干燥温度和热压干燥时间。设计正交试验,以滤饼含水率为考察指标,结果表明:影响滤饼含水率的显著因素是浆体填料高度(决定滤饼厚度)和热压干燥时间,浆体填料高度为40 mm,热压干燥温度为150℃,热压过滤时间为15 min和热压干燥时间为30 min时,所得滤饼水分最低,质量分数为15.67%。热压干燥过程中部分水分以液态形式脱除,与传统热力干燥相比节能约73%。The ultra fine CaCO3 powder product is obtained from CaCO3 slurry manutacturea Dy caroomzatton technology through mechanical filtration and two-stage thermal drying. The production process is complex and the energy cost is high. The solid-liquid separation techniques of thermo-compression filtration-drying was taken to study the dewatering drying of ultra fine CaCO3 suspension for the purpose of simplifying the traditional producing technique. A minitype then-no-compression filtration-drying device was designed and manufactured based on the principle analysis and theoretical research of the solld-liquid separation technique of tbermo-compression filtration- drying. The main factors that influence the thermo-compression drying effects of CaCO3 suspension were identified as filter cake thickness, thermo-compression drying temperature and thermo-compression drying time. The orthogonal test was designed and the moisture of filter cake was taken as assessing index. The results indicate that the most remarkable influencing factors are the loading height （which determines filter cake thickness ） and the thermo-compression drying time. When the loading height is 40 ram, the thermo-compression drying temperature is 150 ~C, the thermo-compression filtrating time and the thermo-compression drying time are 15 min and 30 min respectively, the moisture of the obtained filter cake was the lowest（mass fraction 15.67% ）. The partial water of the suspension is removed as liquid stage in the thermo-compression drying process, which can save energy by 73% compared with the traditional thermal drying.

关 键 词：CaCO3悬浮液 热压过滤 固液分离 干燥 

分 类 号：TQ132.32[化学工程—无机化工]