超声衰减测粒理论模型的因素分析及分形修正

根据超声衰减理论模型, 对影响超声波衰减的主要因素如超声波频率、固体浓度和密度、颗粒粒度、矿浆温度等进行了模拟计算和详细分析, 阐明了各因素间的相互关系; 同时分析了颗粒不规则性、表面粗糙度对理论模型的影响, 说明该理论模型的不适用性; 采用分形方法对理论模型进行了修正。实际应用结果表明, 理论模型预测值与实际检测值明显不一致, 而分形修正模型预测值与实际检测值较吻合, 说明了该分形修正模型可应用于实际矿浆体系的超声衰减测粒中。

Factors Analysis and Fractal Modification of Ultrasonic Attenuation Theoretic Model for Particle Size Measurement

Based on the ultrasonic attenuation theoretic model, simulative calculation and detailed analysis on some dominant factors influencing ultrasonic attenuation, including ultrasonic frequency, volume concentration, solid density, particle size and pulp temperature, were carried out, and the interrelations among these factors were illustrated. Meanwhile, the effect of surface roughness and morphological irregularity of the particles on the theoretic model was discussed, which testified the inapplicability of the model. Theoretic model was therewith modified by the fractal method. The result of the practical application shows that the predictions of theoretic model obviously differ from the experimental data, while, the forecasted data based on the modified model tally with the experimental ones, which indicates that the modified model is applicable for measuring the size of particles in the actual pulp.