响应曲面优化微波干燥铅渣的工艺研究

采用微波加热技术对铅渣进行脱水。通过响应曲面法中心组合设计分析了干燥温度、干燥时间、物料厚度对脱水率的影响,并建立了相关的数学模型。方差分析表明,二次方数学模型拟合较好,物料厚度、干燥温度对脱水率的影响较干燥时间更为显著。优化工艺参数为干燥温度93℃,干燥时间10min,物料厚度19mm,相对脱水率达到68.21%,实际值与模型预测值相差0.73个百分点,干燥后铅渣的含水量为8.12%,可以满足后序工艺要求。

Optimization of Microwave Drying of Lead Slag with Response Surface Methodology

A new technology of microwave heating was applied to dry lead slag.The effects of drying temperature,drying duration and material thickness on the dehydration rate of lead slag were investigated by means of the response surface(RSM) central composite design(CCD),and the mathematical model was established.As can be seen from the ANOV,quadratic of mathematical model is better than others in terms of goodness of fit.The material thickness and temperature are found to exert more significant effects on the dehydration rate than drying duration.The optimum conditions for dying with microwave radiation include temperature of 93 ℃,duration of 10 min and material thickness of 19 mm.The optimum dehydration rate is 67.48% with the relatively error of just 0.73 percentage point.The moisture content after drying is less than 8.12%,which satisfies the technological requirements of following processes.