Wet Magnetic Separation of Ti, Cr, Fe Compounds from Incinerated Bottom Ash by Controlling the Magnetic Susceptibility of the Medium
The incinerated bottom ash includes titanium oxides and a small amount of chromium oxides.Initially, 89 % of chromium was removed from ash at magnetic flux density at several stages of wet magnetic separation from 0.05 T to 6 T.The bottom ash from an industrial waste incineration process includes about 10 % of TiO2. The minerals that contain titanium are futile and perovskite. These minerals are paramagnetic and show low magnetic susceptibility, therefore, the high magnetic field strength, created by a superconducting magnet, is necessary to capture these minerals. At the first stage of separation, a magnetic field strength of 6T was applied in order to attract the particles that contain iron oxides to the higher magnetic field region. At the second stage of separation, the magnetic capture rate of weekly magnetic particles decreased with increasing the magnetic susceptibility of the aqueous solution (i.e. the medium for dispersing the particles) in order to separate the highly magnetic materials. The paramagnetic salt such as ferric chloride was dissolved in the water to increase the magnetic susceptibility of the medium. After a two-step wet HGMS with superconducting magnet, the grade of TiO2 was increased from 10 % to 28 % with a recovery of 64 %.
Magnetic separation Ash Ti Cr Fe Magnetic susceptibility
T. Fujita G. Dodbiba R. Ito H. Tanno J. W. Ahn
Department of Systems Innovation, The University of Tokyo, Tokyo, Japan Dowa Eco-System, Dowa Holdings Co., Ltd., Japan Eriez Magnetics Japan Co., Ltd., Japan Korea Institute of Geoscience & Mineral Resources, Korea
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
729-734
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）