三水碳酸镁浆液过滤及脱水性能的测定与模拟（英文）

发布时间：2018-03-20 02:29

  本文选题：三水碳酸镁　切入点：过滤　出处：《过程工程学报》2017年06期 　论文类型：期刊论文

【摘要】：考察了颗粒特征(尺寸和形状)和操作条件(过滤差压、离子强度、浆液固体浓度和过滤温度)对三水碳酸镁沉降、过滤和脱水性能的影响.结果表明,三水碳酸镁的沉降速率受离子强度和浆液固体浓度影响明显,过滤性能与离子强度无关,提高浆液固体浓度和过滤温度、增加颗粒尺寸和降低过滤差压大均有利于改善三水碳酸镁的过滤性能;三水碳酸镁脱水性能的提高有赖于高的过滤差压和高的浆料浓度.基于实验数据,通过回归计算得到三水碳酸镁滤饼的压缩系数和孔隙分布因子,采用Happel模型以三水碳酸镁的颗粒尺寸、滤饼的平均孔隙率及其它颗粒特征数据对三水碳酸镁滤饼比阻进行模拟计算,结果与实验数据一致性高,表明该模型可用于三水碳酸镁滤饼比阻的预测.
[Abstract]:The effects of particle characteristics (size and shape) and operating conditions (filtration differential pressure, ionic strength, slurry solid concentration and filtration temperature) on the deposition, filtration and dehydration properties of magnesium carbonate trihydrate were investigated. The sedimentation rate of magnesium carbonate trihydrate is obviously affected by ionic strength and solid concentration of slurry, the filtration performance is independent of ionic strength, and the solid concentration of slurry and filtration temperature are increased. Increasing particle size and decreasing filtration differential pressure can improve the filtration performance of magnesium carbonate trihydrate, and the improvement of dehydration performance of magnesium carbonate trihydrate depends on high filtration differential pressure and high slurry concentration. The compression coefficient and pore distribution factor of magnesium carbonate trihydrate filter cake were calculated by regression. The particle size of magnesium carbonate trihydrate was calculated by Happel model. The average porosity and other particle characteristics of the filter cake were simulated and calculated for the specific resistance of the cake. The results were in good agreement with the experimental data, which indicated that the model could be used to predict the specific resistance of the cake.
【作者单位】： 中国科学院过程工程研究所绿色过程与工程重点实验室;北京安珂罗工程技术有限公司;
【基金】：Supported by National Natural Science Foundation of China(No.21076212,21076213) National Basic Research Program of China(973)(No.2007CB613501;2009CB219904)
【分类号】：TQ132.2
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本文编号：1637120