高梯度磁分离及其应用

一、高梯度磁分离HGMS(或过滤HGMF)技术高梯度磁分离(过滤)技术采用强磁场(10—100KG)、高梯度(1KG/μ)的理论,用较小的功率获得很大的捕获力(比常规磁分离大10~8倍),借以分离(或捕获)很微小的颗粒,而常规磁分离技术不能分离的弱磁性及顺磁性元素达55种之多。高梯度电磁过滤器处理污水电耗率随着装置尺寸加大会更加改善,因为过流截面积     

一种有效延长膜使用寿命的中水处理工艺改进方法——郭玉同．CN 101274219

本发明涉及一种新的中水回用的改进工艺，针对利用膜分离技术处理的前期预处理过程中传统工艺的不足．采用二级磁分离技术和相应有磁过滤设备代替传统的过滤工艺和设备，通过添加磁种和絮凝剂，作为膜分离技术的前期预处理技术和设备。     

磁分离技术在水污染治理中的应用

磁分离技术作为一种高效、环保的分离技术,本身具备了分离速率快、效率高、无二次污染等优点,在水处理领域备受关注和应用。随着超导高梯度磁分离技术以及磁分离器设计的进一步发展,磁分离技术在水处理领域逐渐显示出巨大的应用潜力。本文简述磁分离技术和磁种的种类,综述磁分离技术在水处理领域的应用,指出了磁分离技术在水处理领域亟待解决的问题。     

粉煤灰中磁珠的回收及用于含磷废水的处理

论述了从粉煤灰中回收磁珠，利用磁珠作磁种，加混凝剂，用高梯度磁分离技术处理含磷废水机理及方案实施的效果，提出了一种以废治废的措施。     

磁性介质及其在生物技术中的应用

论述了磁性介质的来源,分类及以其为基础的生物物质磁性分离技术,着重介绍了混合／澄清,高梯度磁分离／过滤,双水相萃取,磁稳定流化床及磁泳等操作过程的原理和应用实例。     

超导磁分离：工业废水处理新途

一项超导磁体应用技术研究表明,超导高梯度磁分离技术可用于造纸、化工、医药工业废水的净化分离。与传统的超导磁分离技术只能分离矿物、煤、高岭土中磁性杂质不同,该技术通过预先加入改性的磁种子颗粒材料,从而分离工业废水中无磁性的有机、无机污染物,实现工业污水的达标排放。     

“表层过滤”技术及其在超细粉体过滤、洗涤及压干技术上的成功应用

<正>上海洪利净化科技有限公司经过十多年的研发,研制成功以"表层吸附,孔口架桥"为过滤机理的"表层过滤"新技术。它是已有二百年历史的传统的"表面过滤"与"深层过滤"两大类过滤技术之后出现的第三类过滤技术。与"表面过滤"及"深层过滤"相比,"表层过滤"避免了"表面过滤"与"深层过滤"的所有固有缺点,保留了"表面过滤"与"深层过滤"的所有固有优点。其最大特点是过滤精度与过滤效率非常高,而能耗与物耗却相当低。滤材的使用寿命很长,洗涤与压干效率相当高,卸除干滤饼又快速又简便,自动化程度高,整个技术与装置对环境很友好。     

“表层过滤”技术及其在超细粉体过滤,洗涤及压干技术上的成功应用

上海洪利净化科技有限公司经过十多年的研发,研制成功以“表层吸附,孔口架桥”为过滤机理的“表层过滤”新技术。它是已有二百年历史的传统的“表面过滤”与“深层过滤”两大类过滤技术之后出现的第三类过滤技术。与“表面过滤”及“深层过滤”相比,“表层过滤”避免了“表面过滤”与“深层过滤”的所有固有缺点,保留了“表面过滤”与“深层过滤”的所有固有优点。其最大特点是过滤精度与过滤效率非常高,而能耗与物耗却相当低。滤材的使用寿命很长,洗涤与压干效率相当高,卸除干滤饼又快速又简便,自动化程度高,整个技术与装置对环境很友好。     

高梯度磁分离的几种状况

国际研究及开发有限公司,太尼新堡高梯度磁分离原理介绍磁分离的应用已经采用有许多年了,虽然它的习惯设计只限止着用于少数工业技术上的一些方法。湿式及干式分离器在采用方面,两者都已经有所发展,并已有用于去除河流中的污染物或是回收低梯度给料的所需颗粒。在常用的磁过滤设计中增加在分离(或     

铁盐絮凝剂磁絮体形成的最佳参数及性能研究

本文系统研究了失盐及有机高分子絮凝剂与磁粉在高浊度原水中复合投加的絮凝效果和含磁絮体形成的最佳参数，并通过比较处理效果，出水沉降时间和含磁絮体的显微结构，验证了本磁絮凝方法处理高浊度原水效果更好，停留时间更短的预估，且絮体含磁易分离、为管式絮凝器采用磁絮凝和高梯度磁分离工艺提供了参数依据和高效絮凝分离一体化，管经的可行性证明。     

大梯度磁滤法处理微污染水的试验研究

以受污染的湖水作为原水,采用大梯度磁滤取代传统的砂滤,对水中浊度、色度、藻类、有机物以及细菌、大肠杆菌等的去除进行了研究,结果表明,大梯度磁滤法对水中细菌、藻类和有机物具有很好的去除效果,在磁通密度为0.13T情况下藻类的去除率为96%,有机物去除率近60%,细菌去除率可达98%,大肠杆菌去除率可达96%,其它指标满足国家饮用水卫生标准。     

Particle Flocculation and Filtration by High-Gradient Magnetic Fields

Abstract

Flocculation and filtration of micrometer-sized particles in a high-gradient magnetic field (HGMF) were investigated. Experiments were conducted using a cryogenic magnet of 6 Tesla maximum strength. Hematite particles were used for flocculation and filtration experiments. A new approach of using magnetic fields to enhance separation of weakly magnetic particles was also investigated. This approach is based on magnetic seeding which involves flocculation of existing nonmagnetic particles with injected paramagnetic particles. A particle-flocculation model was developed based on trajectory analysis. External forces due to gravity and magnetism, and interparticle forces such as electrostatic, hydrodynamic, magnetic dipole, and van der Waals forces, were taken into consideration in these models.

     

表面改性磁种-磁滤技术处理含油废水的研究

将表面改性后的磁粉,磁性颗粒分别作为磁种和磁滤材料,以出水含油量、除油率为试验指标,采用磁种-磁滤技术处理江苏油田废水.试验结果表明,经改性后的Fe3O4磁种粒度小、比表面积大,与油滴的吸附亲和力增强,且包覆在Fe3O4表面的偶联剂能阻止Fe3O4微粒聚结,减缓沉降速度,从而提高除油效果.当进水含油量为140.3mg/L,磁种投加量300mg/L、搅拌强度250r/min,搅拌时间20min、磁滤速度25m/h、磁感应强度0.0839T时,出水含油量降为19.8mg/L,除油率迭85.9%.     

磁种-磁滤法在洗车废水回用处理的研究

采用磁种-磁滤法对洗车废水进行处理,以便能达到废水回用的目的。考察了磁种投加量、混凝剂用量、磁场强度和磁滤速度对出水浊度的影响,并在最佳条件下对实际废水进行了处理。结果表明,在磁种投加量为80mg／L,聚合氯化铝用量为45mg／L,磁场强度为2000Gs,磁滤速度为80m／h的条件下,出水达到了生活杂用水水质标准的要求（CJ25．1-89）。     

微米级高分子精密过滤技术及其在精细化工、水处理与环保领域的应用

微米级高分子精密过滤既能澄清过滤 ,也能滤饼过滤 ,还能卸干滤饼 ,过滤介质能高效再生 ,耐化学性能好 ,是一种使用寿命长的新型过滤技术。主要介绍了该技术的组成特点及其在精细化工、水处理及环保领域的主要应用。     

DEM‐simulation of the magnetic field enhanced cake filtration

Using the discrete element method, we simulate numerically the cake formation and growth in magnetic field enhanced cake filtration to give further insight on the mechanisms of the structuring of the filter cake due to the interaction of magnetic, hydrodynamic, and mass forces. The motion of the discrete particles is obtained by applying the three‐dimensional Newton's equations to individual particles, allowing for both external forces (gravity, applied magnetic field) and particle–particle interactions calculated using the modified DLVO‐theory. Continuous liquid phase flow is assumed as one‐dimensional. The simulation results compare favorably with reported experimental data, 1 and can be used to delineate the regimes associated with different liquid flow and magnetic field effects that are observed experimentally. © 2012 American Institute of Chemical Engineers AIChE J, 2012     

MAGNETIC-SEEDING FILTRATION

ABSTRACT

Magnetic-seeding filtration consists of two steps: heterogeneous particle flocculation of magnetic and nonmagnetic particles in a stirred tank and high-gradient magnetic filtration (HGMF). The effects of various parameters affecting magnetic-seeding filtration are theoretically and experimentally investigated. A trajectory model that includes hydrodynamic resistance, van der Waals, and electrostatic forces is developed to calculate the flocculation frequency in a turbulent-shear regime. Fractal dimension is introduced to simulate the open structure of aggregates. A magnetic-filtration model that consists of trajectory analysis, a particle build-up model, a breakthrough model, and a bivariate population-balance model is developed to predict the breakthrough curve of magnetic-seeding filtration. A good agreement between modeling results and experimental data is obtained. The results show that the model developed in this study can be used to predict the performance of magnetic-seeding filtration without using empirical coefficients or fitting parameters.

     

Preparation and Properties of PVDF/Fe3O4 Nanofibers with Magnetic and Electret Effects and their Application in Air Filtration

Electrospun electret filter material is widely studied because of its excellent removal effect on particulate matter from air streams. Here, a kind of high efficiency and low pressure drop nanofiber (NF) membrane with both electret effect and magnetic effect is developed, and compounded it with glass fiber mesh and polyester (polyethylene terephthalate) mesh to prepare a sandwich structure of NF anti‐haze window screen. Under the synergistic effect of magnetic particles, when the density is 2.06 g m^?2, the filtration efficiency of NF anti‐haze window screen can reach 99.95% for the fine particles below 0.3 µm, while the filtration pressure drop is only 58.5 Pa, with good light transmittance and excellent breaking strength (6.32 MPa). Therefore, polyvinylidene fluoride/Fe₃O₄ composite NF membrane has a potential application prospect in the field of air filtration.     

CUNO过滤器在涂料中的应用

与常用的板框过滤器相比,ＣＵＮＯ 过滤器具有操作方便、占用空间小、过滤效率高等特点。介绍了该过滤器的结构及其工作原理。比较了过滤器的不同过滤芯的过滤效率。讨论了ＣＵＮＯ 过滤器在涂料、磁性记录介质、化妆品中的应用     

砂滤技术在水处理研究中的进展

对砂滤技术进行了简要的概述。从级配、滤料种类、特殊水质等方面对影响过滤的几个重要因素进行了论述。从除浊、除氨氮、除铁锰、除藻等方面详细的论述了砂滤技术的应用现状。对砂滤工艺中存在的问题,从滤料改性、微絮凝过滤、生物强化过滤等方面总结了强化过滤的措施和发展趋势。