ENHANCED MAGNETIC SEPARATION OF PYRITE FROM COAL AFTER MICROWAVE-HEATING

被引:15
作者
BLUHM, DD
FANSLOW, GE
NELSON, SO
机构
[1] IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN,AMES,IA 50011
[2] USDA ARS,RICHARD B RUSSELL AGR RES CTR,ATHENS,GA 30613
关键词
HEATING; -; Radiant; MICROWAVES; Applications; PYRITES; SEPARATORS; Magnetic;
D O I
10.1109/TMAG.1986.1064686
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A method is proposed for improving the magnetic separation of coal and pyrite by enhancing the magnetic susceptibility of pyrite in run-of-mine coal through the use of selective dielectric heating to change a portion of each pyrite particle to a more magnetic form. Studies included the measurement of the dielectric properties of different coal fractions at frequencies ranging from 1 MHz to 12 GHz. These values were then used to calculate the theoretical heating expected in these materials and their mixtures at 2. 45 GHz. The experimental treatment showed general agreement between theoretical and experimental heating and that it is possible to heat pyrite in coal selectively. Data indicated an increase in the apparent magnetic susceptibility of dielectrically heated pyrite samples that was roughly proportional to the time and power of treatment. Magnetic separation tests were conducted on untreated and heated coal samples. Dielectric heating produced more magnetic material in the samples, increased the magnetic susceptibility, and slightly improved magnetic separations.
引用
收藏
页码:1887 / 1890
页数:4
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