Supporting theory of a new magnetic separator and classifier. Limiting conditions: Part II – Magnetic particles

2007 ◽  
Vol 7 (3) ◽  
pp. 264-273 ◽  
Author(s):  
Paulo A. Augusto ◽  
Teresa Castelo-Grande ◽  
Pedro Augusto ◽  
Domingos Barbosa ◽  
A.M. Estévez
Keyword(s):  
Magnetic Particles ◽  
Magnetic Separator

Supporting theory of a new magnetic separator and classifier. Limiting conditions: Part I – Non-magnetic particles

2007 ◽  
Vol 7 (3) ◽  
pp. 258-263 ◽  
Author(s):  
Paulo A. Augusto ◽  
Teresa Castelo-Grande ◽  
Pedro Augusto ◽  
Domingos Barbosa ◽  
A.M. Estévez
Keyword(s):  
Magnetic Particles ◽  
Magnetic Separator

scholarly journals Optimization of a Magnetic Separator Air-Gap

1986 ◽  
Vol 2 (2) ◽  
pp. 97-113
Author(s):  
Kazimierz Adamiak
Keyword(s):  
Force Field ◽  
Magnetic Particles ◽  
Magnetic Force ◽  
Air Gap ◽  
Field Analysis ◽  
Magnetic Separator ◽  
Inverse Boundary ◽  
Force Field Analysis ◽  
Inverse Boundary Problem ◽  
Magnetic Force Field

The paper describes a method of optimization of a magnetic separator air-gap which serves to separate magnetic particles from volatile power plant dust. The method consists in seeking the air-gap dimensions, assuming that the shape of poles is known on the basis of magnetic force field analysis, or in seeking the shape of poles for the assumed force field distribution. In the second case the problem is reduced to solving a certain inverse boundary problem of the Dirichlet type.

scholarly journals Magnetic Biofilm Carriers: The Use of Novel Magnetic Foam Glass Particles in Anaerobic Digestion of Sugar Beet Silage

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Patrice Ramm ◽  
Carsten Jost ◽  
Elisabeth Neitmann ◽  
Ulrich Sohling ◽  
Oliver Menhorn ◽  
...  
Keyword(s):  
Sugar Beet ◽  
Magnetic Particles ◽  
Loading Rate ◽  
Biogas Production ◽  
Foam Glass ◽  
Organic Loading Rate ◽  
Separation Procedure ◽  
Organic Loading ◽  
Magnetic Separator ◽  
Volatile Solids

The use of recently developed magnetic foam glass particles for immobilization of microbial biomass was tested. The effect of the particles was illustrated at the production of biogas from sugar beet silage as the sole substrate. Lab-scale fermentation experiments were conducted using a mesophilic completely stirred tank reactor and a magnetic separator. Microscopic analysis revealed biofilm coverage of 50–60% on the surface of the particles within 110 days. It was possible to recover 76.3% of the particles from fermentation effluent by means of a separation procedure based on magnetic forces. Comparing a particle charged reactor with a control reactor showed a small performance gain. The methane rate was increased from1.18±0.09to1.25±0.06 L L−1 d−1and the methane yield was increased from0.302±0.029to0.318±0.022 L g−1(volatile solids) at an organic loading rate of3.93±0.22 g L−1 d−1(volatile solids). Maximum methane rates of 1.42 L L−1d−1at an organic loading rate of 4.60 g (volatile solids) L−1 d−1(reactor including magnetic particles) and 1.34 L L−1 d−1at 3.73 g L−1 d−1(control reactor) were achieved. Based on the results, it can be concluded that the use of magnetic particles could be an attractive option for the optimization of biogas production.

A Study of Liberation and Separation Process of Metals from Printed Circuit Boards (PCBs) Scraps

2013 ◽  
Vol 594-595 ◽  
pp. 123-127
Author(s):  
Aimi Noorliyana Hashim ◽  
Kasmuin Mohd Zaheruddin ◽  
Hussin Kamarudin
Keyword(s):  
Rare Earth ◽  
Magnetic Particles ◽  
Printed Circuit Boards ◽  
Ceramic Materials ◽  
Circuit Boards ◽  
Metallic Elements ◽  
Fundamental Study ◽  
Magnetic Separator ◽  
Printed Circuit ◽  
Pre Treatment

Since the metallic elements are covered with or encapsulated by various plastic or ceramic materials on printed circuit boards (PCBs), a pre-treatment process allowing their liberation and separation is first needed in order to facilitate proficient extraction. In this work, a fundamental study has been carried out to recover metallic concentrates from PCBs scraps. The most important step is to separate or release particles from the associated gangue minerals at the possible liberation particle size. The samples of printed circuit boards were separated into the magnetic and non-magnetic fractions by Rare-earth Roll Magnetic Separator. Then, the magnetic and non-magnetic fractions were separated to heavy fraction (metallic elements) and light fraction (plastic) by Mozley Laboratory Table Separator. Results show that the unliberated particles still remain in the comminution fines PCBs. The use of Rare-earth roll magnetic separation was clarified that the Fe, Ni and Zn element tend to be condensed in magnetic particles. Meanwhile Cu element tends to be release in non-magnetic particles. Mozley Laboratory Table Separation was capable to obtain fractions with relatively high concentrations of metallic elements. This study is expected to provide useful data for the efficient physical separation of metallic components from printed circuit boards scraps.

scholarly journals Simulation of Magnetophoretic Separation Processes in Dispersions of Superparamagnetic Nanoparticles in the Noncooperative Regime

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Jordi S. Andreu ◽  
Pablo Barbero ◽  
Juan Camacho ◽  
Jordi Faraudo
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Separation ◽  
Magnetic Particles ◽  
Colloidal Particles ◽  
Low Cost ◽  
Superparamagnetic Nanoparticles ◽  
Separation Processes ◽  
Magnetic Separator ◽  
Simulation Strategy ◽  
Magnetophoretic Separation

Magnetic separation has gained much attention due to its implications in different fields, becoming feasible as an alternative to existent technologies at the industrial and lab scale. Substantial efforts are focused to improve the magnetic particles used in these applications. Here we show how a relatively simple and low-cost simulation strategy (tracer simulations) can be employed to predict the effect of various key factors in magnetic separation processes, namely, particle properties and magnetic separator designs. For concreteness, we consider here specific problems in magnetic separation. The first one is the effect of different profiles of the magnetic field in the separation of magnetic nanoparticles, and the second one is the magnetophoresis of colloidal particles in a dispersion of magnetic nanoparticles.

scholarly journals Variables and Applications on Dry Magnetic Separator

2018 ◽  
Vol 53 ◽  
pp. 02019
Author(s):  
Qin Xing Zong ◽  
Luo Zhen Fu ◽  
Lv Bo
Keyword(s):  
Rare Earth ◽  
Magnetic Separation ◽  
Large Scale ◽  
Magnetic Particles ◽  
Water Shortage ◽  
Heavy Mineral ◽  
Magnetic Separator ◽  
New Ideas ◽  
Dry Magnetic Separation ◽  
Separation Equipment

Magnetic separation is an indispensable part of magnetic separation, and the dry magnetic separator can be selected under the condition of water shortage in China to ensure that our country can also be selected under the conditions of lack of some resources. The magnetic separator plays a role in improving the grade of ore, purifying solid and liquid materials, and recycling waste. With the application and development of magnetic separation technology, magnetic separation equipment is constantly updating and replacing, and dry magnetic separation has experienced remarkable technological progress over the past twenty years. There are many new ideas and techniques applied in magnetic separators. So far, dry magnetic separators have developed many different applications for mineral and coal processing, for induction roller magnetic separators for chromite. Cross-belt magnetic separator for removing harmful magnetic particles and paramagnetic particles. The lifting roller magnetic separator is used in the heavy mineral industry to separate garnet from monazite and rutile. Rare earth drum magnetic separator for fine feed dry magnetic separation sorting process and rare earth roller magnetic separator for zircon and rutile in heavy mineral sand industry. These magnetic separators have different applications, and the dry magnetic separator is also moving toward large-scale and easy-to-manufacture.

scholarly journals Multiphysics Modeling Simulation and Optimization of Aerodynamic Drum Magnetic Separator

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 680
Author(s):  
Jianjun Liu ◽  
Zixing Xue ◽  
Zhenhai Dong ◽  
Xiaofeng Yang ◽  
Yafeng Fu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Separation ◽  
Magnetic Particles ◽  
Magnetic Separator ◽  
Simulation And Optimization ◽  
Finite Element Software ◽  
Coupling Force ◽  
Magnetic Poles ◽  
Separation Behavior ◽  
The Magnetic Field

Aerodynamic Drum Magnetic Separator (ADMS) uses an adjustable air flow to enhance the separation of magnetic particles from gangue. In order to explore the matching relationship between the magnetic field, the flow field, and the gravity field, as well as the capture and separation behavior of particles under the action of multi-physics, a related simulation model is established using the finite element software COMSOL Multiphysics and the accuracy of the simulation results is verified by measurement, formula calculation, and magnetic separation experiment. The trajectories and capture probabilities of particles in different magnetic fields and flow fields are calculated, as well as the critical airflow velocity corresponding to a specific capture probability. In addition, the magnetic field characteristics and particle capture effect of N-S alternate arrangement and N-N homopolar arrangement are compared by optimizing the permutation of magnetic poles. This model may provide a reference for the accurate control of magnetic separation enhanced by a coupling force field.

scholarly journals METHOD OF CALCULATION OF MAGNETIC SEPARATORS WITH A FERROMAGNETIC BALL NOZZLE FOR CLEANING SUSPENSIONS FROM MAGNETIC IMPURITIES

2021 ◽  
pp. 69-74
Author(s):  
А.Г. Овчаренко ◽  
М.С. Василишин
Keyword(s):  
Magnetic Particles ◽  
Magnetic Impurities ◽  
Magnetic Separator ◽  
Method Of Calculation ◽  
Contact Points ◽  
Working Space ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Adsorption Processes ◽  
Deposition Processes

Для повышения эффекта очистки суспензий от магнитных частиц экономически целесообразно в промышленных условиях использовать устройства с магнитными полями невысокой напряженности, но имеющими высокие градиенты магнитного поля в рабочем пространстве. В качестве таких устройств используются магнитные сепараторы с ферромагнитной шаровой насадкой. Для расчетов за основу взята модель процесса осаждения магнитных частиц в квазисплошном поглощающем экране магнитного фильтра, при этом предполагается, что рельеф зоны захвата в окрестности точек контакта намагниченных шаров будет в виде сегментов с характерными размерами rо и b. Анализ такой модели позволил отметить подобие рассмотренных процессов осаждения в магнитном сепараторе процессам адсорбции и в дальнейшем использовать элементы теории процесса адсорбции для расчетов таких сепараторов. Представлена методика расчета магнитных сепараторов с ферромагнитной шаровой насадкой для очистки суспензий от магнитных примесей. Экспериментальная проверка расчетных зависимостей при очистке антифрикционной присадки «Деста» подтвердила возможность использования предложенной методики для магнитных сепараторов с ферромагнитной шаровой насадкой To increase the effect of cleaning suspensions from magnetic particles, it is economically feasible in industrial conditions to use devices with low-intensity magnetic fields, but having high magnetic field gradients in the working space. As such devices, magnetic separators with a ferromagnetic ball nozzle are used. The calculations are based on a model of deposition of magnetic particles in a magnetic absorbing screen, and it is assumed that the topography of the capture zone in the vicinity of the contact points of the magnetized balls will have the form of segments with characteristic sizes ro and b. The analysis of such a model allowed us to note the similarity of the considered deposition processes in the magnetic separator with the adsorption processes and to further use the elements of the theory of the adsorption process for the calculations of such separators. A method for calculating magnetic separators with a ferromagnetic ball nozzle for cleaning suspensions from magnetic impurities is presented. Experimental verification of the calculated dependences during the cleaning of the anti-friction additive "Desta" confirmed the possibility of using the proposed calculation method for magnetic separators with a ferromagnetic ball nozzle.

A new wastewater treatment system recovering magnetically immobilized microorganisms under strong magnetic field

2004 ◽  
Vol 4 (1) ◽  
pp. 47-54
Author(s):  
H. Ozaki ◽  
S. Kurinobu ◽  
T. Watanabe ◽  
S. Nishijima ◽  
T. Sumino
Keyword(s):  
Magnetic Field ◽  
Wastewater Treatment ◽  
Magnetic Particles ◽  
High Efficiency ◽  
Nitrifying Bacteria ◽  
Water And Wastewater Treatment ◽  
Magnetic Separator ◽  
Gel Particles ◽  
Water And Wastewater ◽  
Immobilized Microorganisms

A new generation of high gradient magnetic separation (HGMS) has recently received attention again, especially for its applications in the field of water and wastewater treatment. The reason for this attention is that a newly developed superconducting magnet can be used to easily generate a high magnetic field, under which even weakly paramagnetic materials can be separated at high efficiency. We have developed a new wastewater treatment process using magnetic gel particles containing immobilized microorganisms and magnetic particles. The magnetic gel particles are separated and recovered from the effluent in water and wastewater treatment processes, and are then recycled to a bioreactor directly or reused after storing. In this research, a novel type of magnetic separator without a filter matrix was designed for the separation and recovery of magnetic gel particles with different magnetic characteristics. No backwashing is required for this new type of separator. By using the separator, polyethylene glycol (PEG) gel particles with 2% magnetite were continuously separated and recovered from the PEG gel particles with 0.04% magnetite at an efficiency of around 90%. The PEG gel particles containing nitrifying bacteria and magnetic particles were available for the oxidation of ammonia solution at a slightly lower nitrification rate than the PEG gel particles with nitrifying bacteria but without magnetite.

Supporting theory of a new magnetic separator and classifier. Equations and modeling: Part II – Magnetic particles

2007 ◽  
Vol 7 (3) ◽  
pp. 247-257 ◽  
Author(s):  
Paulo A. Augusto ◽  
Teresa Castelo-Grande ◽  
Pedro Augusto ◽  
Domingos Barbosa ◽  
A.M. Estévez
Keyword(s):  
Magnetic Particles ◽  
Magnetic Separator
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