Coal dressing magnetite powder magnetism strengthening method
The technology of magnetite powder and magnet is applied in the field of magnetism enhancement of magnetite powder for coal preparation, which can solve the problems of technical loss, economic waste, weak magnetism of fine-grained magnetite powder, etc., so as to reduce the dielectric consumption. , the effect of low cost and low strength
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Embodiment 1
[0013] The magnetic strengthening method of magnetite powder for coal preparation adopts the following steps: a. Put the magnetite powder in a corundum crucible and put it in a heating furnace, and depressurize until the air pressure in the heating furnace is 0.09Mpa; b. Heating in the heating furnace After holding at 300°C for 40 minutes, stop heating; c. The heating furnace is naturally cooled in the air. At the same time, a pulsed magnetic field with a frequency of 30 Hz and a magnetic field strength of 5000 oe is applied on the side of the heating furnace until the furnace body cools down to room temperature ; d, taking out the magnetite powder for packaging and storage.
[0014] It was tested that its magnetic substance content increased by 2.11%, the residual magnetic field strength increased by 68%, and the saturation magnetic field strength increased by 43%.
Embodiment 2
[0016] The magnetic strengthening method of magnetite powder for coal preparation adopts the following steps: a, put the magnetite powder in a corundum crucible and put it in a heating furnace, decompress until the pressure in the heating furnace is 0.06Mpa; b, heat the heating furnace After holding at 400°C for 30 minutes, stop heating; c. The heating furnace is naturally cooled in the air. At the same time, a pulsed magnetic field with a frequency of 100 Hz and a magnetic field strength of 8000 oe is applied on the side of the heating furnace until the furnace body cools to room temperature. ; d, taking out the magnetite powder for packaging and storage.
[0017] It was tested that its magnetic substance content increased by 2.63%, the residual magnetic field strength increased by 77%, and the saturation magnetic field strength increased by 50%.
Embodiment 3
[0019] The magnetic strengthening method of magnetite powder for coal preparation adopts the following steps: a. Put the magnetite powder in a corundum crucible and put it in a heating furnace, and depressurize until the pressure in the heating furnace is 0.03Mpa; b. Heating in the heating furnace After holding at 500°C for 45 minutes, stop heating; c. The heating furnace is naturally cooled in the air. At the same time, a pulsed magnetic field with a frequency of 200 Hz and a magnetic field strength of 10000 oe is applied on the side of the heating furnace until the furnace body cools to room temperature. ; d, taking out the magnetite powder for packaging and storage.
[0020] It was tested that its magnetic substance content increased by 3.01%, the residual magnetic field strength increased by 86%, and the saturation magnetic field strength increased by 52%.
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