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采用中心组合设计(CCRD),三因素五水平响应曲面法(RSM),研究了微波功率、干燥时间和物料厚度间的交互作用对碳酸稀土脱除吸附水的影响,模拟得到二次多项式回归方程的预测模型。结果表明:物料厚度一定,脱水率随微波功率和干燥时间的增大而增加;微波功率一定,脱水率随物料厚度增加而降低,优化的最佳工艺参数为:微波功率800 W,干燥时间12 min,物料厚度2 cm,脱水率98.88%,实际测得97.69%,相对误差为1.31%。红外光谱(FT-IR)分析表明微波干燥后碳酸稀土不再含有吸附水;粒度分析表明微波干燥后的碳酸稀土具有粒度细和分布均匀的特点。
The effects of interaction between microwave power, drying time and material thickness on the removal of adsorbed water by rare earth carbonate were investigated by CCRD and RSM. The quadratic polynomial regression equation Prediction model. The results show that: the material thickness is constant, the dehydration rate increases with the increase of microwave power and drying time. When the microwave power is constant, the dehydration rate decreases with the increase of material thickness. The optimum technological parameters are microwave power 800 W, drying time 12 min, material thickness 2 cm, dehydration rate 98.88%, the actual measured 97.69%, the relative error of 1.31%. Fourier transform infrared spectroscopy (FT-IR) analysis showed that the rare earth carbonate no longer contains adsorbed water after microwave drying. Particle size analysis showed that the rare earth carbonate after microwave drying has fine grain size and uniform distribution.