Magnetic-Fluid Separations of Coal using a Modified Frantz Electromagnet
作者:
MOHAMED FOFANA,
MARKS. KLIMA,
期刊:
Coal Preparation
(Taylor Available online 1997)
卷期:
Volume 18,
issue 1-2
页码: 91-114
ISSN:0734-9343
年代: 1997
DOI:10.1080/07349349708905140
出版商: Taylor & Francis Group
关键词: Magnetohydrostatic separation;ferro-fluid;washability analysis;float-sink separation;gravity concentration
数据来源: Taylor
摘要:
An investigation on the use or a magnetic fluid-based process for float-sink separations of coal was conducted. The required magnetic field was generated with a Frantz electromagnet using redesigned pole pieces. Finite element analysis was used to analyze the magnetic field distribution between the poles as a function of current intensity. The simulated results compared well with the measured values. Viscosity measurements of the water-based magnetic fluid showed that the viscosity remained relatively low even under high magnetic field strengths. Several size fractions of bituminous coal (0.59x0.50mm and 0.18 x0.15mm) and anthracite (0.50x0.l8mm and 0.18 x 0.15 mm) were separated in a batch separation cell, which was designed to fit between the pole pieces. The yields compared well to those obtained using organic liquids and zinc bromide solutions. However, the ash and sulfur contents of the float material were higher when using the magnetic fluid method, particularly in regions of high near-density material. The differences can be attributed to particle misplacement resulting from slight variations in the magnetic field gradient and the subsequent effect on the apparent density of the fluid.
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