欢迎访问过程工程学报, 今天是
过程与工艺

三水碳酸镁浆液过滤及脱水性能的测定与模拟

  • 王道广 李志宝 王英军
展开
  • 1. 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 100190;2. 北京安珂罗工程技术有限公司,北京 100015

收稿日期: 2017-02-22

  修回日期: 2017-04-26

  网络出版日期: 2017-12-05

Filtration and Dewatering Characteristics of Nesquehonite Suspensions: Experimental and Modeling

  • Daoguang WANG Zhibao LI Yingjun WANG
Expand
  • 1. Key Lab. Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 2. Beijing Encryo Engineering and Technology Co., Ltd., Beijing 100015, China

Received date: 2017-02-22

  Revised date: 2017-04-26

  Online published: 2017-12-05

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.

本文引用格式

王道广 李志宝 王英军 . 三水碳酸镁浆液过滤及脱水性能的测定与模拟[J]. 过程工程学报, 2017 , 17(6) : 1217 -1226 . DOI: 10.12034/j.issn.1009-606X.217142

Abstract

The effect of particle characteristics (i.e. particle size and shape), as well as operating conditions (i.e. pressure drop, ionic strength, solid concentration in slurry and filtration temperature) on the settling, filtration and dewatering properties of nesquehonite were investigated. The results showed that the settling rate was strongly dependent on ionic strength and solid concentration. Meanwhile, the filterability, independent of ionic strength, was improved under the conditions of high solid concentration and filtration temperature, low vacuum pressure drop and large crystal size of nesquehonite. Increased dewaterability was revealed at high vacuum pressure drop and solid concentration. Besides, compressibility coefficient and pore size distribution index of nesquehonite cake were determined by further modeling work. Finally, Happel model was used to predict the specific cake resistance with the particle size, average cake porosity and other particle characteristic data of nesquehonite, and the calculated values were in good agreement with experimental data.

参考文献

[1] Ainul A A, David R D, Shane P U, Peter J S. Electrically enhanced dewatering(EED) of particulate suspensions [J]. Colloids and Surfaces A, 2006, 209, 194-205.
[2] Rushton A, Ward A S, Holdich R G. Solid-Liquid Filtration and Separation Technology [M]. Weinheim: Wiley-VCH, 2000, 110-115.
[3] Wakeman R J, Tarleton E S. Filtration: Equipment Selection, Modelling and Process Simulation [M]. Oxford: Elsevier, 1998, 75-92.
[4] Wakeman R J, Tarleton E S. Solid/Liquid Separation: Scale-up of Industrial Equipment [M]. Oxford: Elsevier, 2005, 98-109.
[5] H?nchen M, Prigiobbe V, Baciocchil R, Mazzotti M. Precipitation in the Mg-carbonate system-effects of temperature and CO2 pressure [J]. Chem. Eng. Sci., 2008, 63, 1012-1028.
[6] Kloprogge J T, Martens W N, Nothdurft L, Duong L V, Webb G E. Low temperature synthesis and characterization of nesquehonite [J]. Journal of Materials Science Letters, 2003, 22, 825-829.
[7] K?nigsberger E, K?nigsberger L C, Gamsj?ger H. Low-temperature thermodynamic model for the system Na2CO3-MgCO3-CaCO3-H2O [J]. Geochim. Cosmochim. Acta., 1999, 63, 3105-3119 .
[8] Ballirano P, Vito C D, Ferrini V, Mignardi S. The thermal behavior and structural stability of nesquehonite, MgCO3?3H2O, evaluated by in situ laboratory parallel-beam X-ray powder diffraction: New constraints on CO2 sequestration within minerals [J]. J. Hazard. Mater., 2010, 178, 522-528.
[9] Ferrini V, Vito C D, Mignardi S. Synthesis of nesquehonite by reaction of gaseous CO2 with Mg chloride solution: Its potential role in the sequestration of carbon dioxide [J]. J. Hazard. Mater., 2009, 168, 832-837.
[10] Park A A. Carbon dioxide sequestration: Chemical and physical activation of aqueous carbonation of Mg-bearing minerals and pH swing process [D]. Columbus: The Ohio State University, 2005, 45-56.
[11] Wang Y, Li Z B, Demopoulos G P. Controlled precipitation of nesquehonite by the reaction of MgCl2 with (NH4)2CO3 at 303 K [J]. J. Cryst. Growth, 2007, 310, 1220-1227.
[12] Cheng W T, Li Z B. Controlled supersaturation precipitation of hydromagnesite for the MgCl2-Na2CO3 system at elevated temperatures: chemical modeling and experiment [J]. Ind. Eng. Chem. Res., 2010, 49, 1964-1974.
[13] Cheng W T, Li Z B. Precipitation of nesquehonite from homogeneous supersaturated solutions [J]. Crystal Research Technology, 2009, 44, 937-947.
[14] Cheng W T, Li Z B. Demopoulos G P. Effect of temperature on the preparation of magnesium carbonate hydrates by reaction of MgCl2 with Na2CO3 [J]. Chinese Journal of Chemical Engineering, 2009, 17, 661-669.
[15] Mark A S. The Chemistry and Technology of Magnesia [M]. New Jersey:John Wiley and Sons, 2006, 125-129.
[16] Wang L M. Improvement of performance of sedimentation filtration of Mg(OH)2 slurry [J]. Sea-lake Salt and Chemical Industry, 2002, 31, 22-25.
[17] Wang P, Du G X, Li F. Effect of flocculation of Mg(OH)2 slurry on its filtration property and washing property [J]. Industrial Mineral and Processing, 2008, 3, 20-22.
[18] Li J Q, Wang P, Liu L, Yang S H. Effect on filtration performance of Mg(OH)2 slurry by some factors [J]. Journal of Guizhou University of Technology (Nature Science Edition), 2007, 36, 32-39.
[19] Li Y L, Peng J P, Ni P, Tang R G. Effect of adding seed crystal and flocculant on magnesium hydrate deposition [J]. Inorganic Chemicals Industry, 2008, 40, 26-28.
[20] Besra L, Singh B P, Reddy P S R. Effect of flocculant on settling and filtration of iron ore sludge [J]. Minerals and Metallurgical Processing, 1996, 11, 402-405.
[21] Besra L, Sengupta D K, Roy S K. Particle characteristics and their influence on dewatering of kaolin, calcite and quartz suspensions [J]. International Journal Mineral Processing, 2000, 59, 89-112.
[22] S?hnel O, Garside J. Precipitation: Basic Principles and Industrial Applications [M], London: Butterworth-Heinmann, 1992, 60-68.
[23] Cheng Y S, Fang S R, Tierney J W, Chiang S H. Application of enhanced vacuum filtration to dewatering of fine coal refuse [J]. Separation Science and Technology, 23, 1988, 2113-2130.
[24] Svarovsky L. Solid-Liquid Separation [M], London: Butterworths, 1981, 35-42.
[25] Wakeman R J. Vacuum dewatering and residual saturation of incompressible filter cakes [J]. International Journal Mineral Processing, 1976, 3, 193-206.
[26] Wakeman R. The influence of particle properties on filtration [J]. Separation and Purification Technology, 2007, 58, 234-241.
[27] Ni L A, Yu A B, Lu G Q, Howes T. Simulation of the cake formation and growth in cake filtration [J]. Mining Engineering, 2006, 19, 1084-1097.
[28] Mihoubi D. Mechanical and thermal dewatering of residual sludge [J]. Desalination, 2004, 167, 135-139.
[29] Mihoubi D, Vaxelaire J, Zagrouba F, Bellagi A. Mechanical dewatering of suspension [J]. Desalination, 2003, 158, 259-265.
[30] Holdich R G. Solid-liquid separation equipment selection and modeling [J]. Minerals Engineering, 2003, 16, 75-83.
[31] Jenny N M, Gerg F. Dend-end filtration of yeast suspensions: Correlating specific resistance and flux data using artificial neural networks [J]. Journal of Membrane Science, 2006, 281, 325-333.
[32] Tiller F M, Cooper H. The role of porosity in filtration, Part V: Porosity variation in filter cakes [J]. AIChE Journal, 1962, 8, 445-449.
[33] Hulston J, Kretser R G, Scales P J. Effect of temperature on the dewatering of hematite suspensions [J]. International Journal Mineral Processing, 2004, 3, 269-279.
[34] Happel J. Viscous flow in multiparticle systems Slow motion of fluids relative to beds of spherical particles [J]. AIChE Journal, 1958, 4, 197-201.
[35] Sluis S V D, Leenhouts W P, Wesselingh J A. Filtration and washing of calcium sulphate/phosphoric acid slurries [J]. Filtration and Separation, 1989, 26, 105-112.
文章导航

/