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Method and apparatus for sorting particles with electric and magnetic forces

A magnetic separation and particle technology, applied in magnetic separation, chemical instruments and methods, Lorentz force separation, etc., can solve the problems that electrostatic technology cannot adapt to scale and limitations

Inactive Publication Date: 2002-06-19
艾克斯普技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently, the separation of subdomain-sized particles from carbon arc products is limited by the electrostatic size classification methods employed
Electrostatic techniques cannot be scaled to commercial output, which limits the potential for extremely small particle sizes to be brought to the laboratory

Method used

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  • Method and apparatus for sorting particles with electric and magnetic forces
  • Method and apparatus for sorting particles with electric and magnetic forces
  • Method and apparatus for sorting particles with electric and magnetic forces

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] The magnetic susceptibility was measured using a modified Goyo balance. (The unit of magnetic susceptibility used below is 10 -6 cm 3 / g, the unit is multiplied by 4π×10 -3 can be converted into the international standard unit m 3 / kg. ) to measure unburned carbon and loss on ignition (LOI) by ashing using a muffle furnace. Sulfur content was determined using a Leco S32 sulfur determiner. ASTM procedures D-3174-82 and D-4239-83 were used for the measurement of ash and sulfur, respectively. Measurements of the LOI were performed according to standard procedure 2520. Determine the weight using an analytical balance with a resolution of 1 / 10 mg. Example 1: Effect of Charge

[0051] Coal particles with a nominal diameter of 0.3-0.6 mm are used to illustrate the effect of friction, triboelectric and capacitive charges, electric field strength, magnetic force and angular velocity on the magnetic separation of an electromagnetic separator. Individual particles can be ...

example 2

[0077] It is clear that the additional application of an electric field in addition to the magnetic force improves the performance of the magnetic separator. Polarity is determined by the triboelectric charge of the particles to be collected at the magnet surface. Example 2: Purified coal.

[0078] The test coal used was a low kittaning coal from Clearfield County, PA, containing 26.06% ash, 7.08% sulfur, a magnetic susceptibility of 133, and contained 0.58% moisture by weight. Particle sizes range from 0.074-1.19 mm in diameter. The coal was fed into an experimental electromagnetic separator at a rate of 116.3 pounds per hour and processed with 0 and ±5000 volts applied to a magnet rotating at 100 RPM. Splitter No. 1, which separates receivers 1 and 2, is 6.74 cm in front of this belt. Splitter No. 2, which separates receivers 2 and 3, is 1.66 cm in front of this belt. Splitter No. 3, which separates receivers 3 and 4, is 1.16 cm in front of this belt. Splitter No. 4, wh...

example 3

[0082] Applying a magnetic field such that the magnet surface is positive with respect to the outer electrode 22 results in a higher rate of reduction of ash and sulfur at a constant Btu recovery rate when compared to operation where the applied voltage difference is zero. When the magnet surface is negative with respect to the external electrode 22, the reduction rate of ash and sulfur is lower. The carbonaceous constituents of the test coal had a positive triboelectric charge while the mineral-rich constituents had a negative triboelectric charge. Applying a positive voltage differential to the surface of the magnetic separator improves the removal of undesirable ash and sulfur containing minerals without negatively affecting the recovery of the clean coal constituents. Example 3: Activated carbon-fly ash mixture.

[0083] Activated carbon was obtained from fisher scientific. Use traditional permanent magnets to sieve carbon particles with a diameter of 74um-297um to remov...

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Abstract

Disclosed is an apparatus and method for sorting particles. The apparatus includes a magnet mechanism(12)for separating particles with a magnetic force. The apparatus includes an electric mechanism including an electrode(22)disposed adjacent to the magnet mechanism for separating particles with a electric force. The apparatus includes a mechanism(26)for providing the particles to the magnet mechanism and the electric mechanism. The providing mechanism is engaged with the magnet mechanism and the electric mechanism. The magnet mechanism(12)acts as another electrode to create an electric field between the magnet mechanism(12)and the electrode(22). The method includes the steps of providing the particles to a magnet mechanism(12)and an electric mechanism, comprised of electrode(22)and magnet mechanism(12). Then there is a step of separating the particles with the magnetic force and the electric force, both acting simultaneously on the particles.

Description

[0001] The present invention is based on the PMI-9760706 funding granted by the National Science Foundation, and is carried out with the support of the government. The government has certain rights in this invention. field of invention [0002] The present invention relates to methods and apparatus for classifying particles. More specifically, the present invention relates to methods and apparatus for sorting particles using electrical and magnetic forces, said particles being charged by frictional and capacitive contact. Background of the invention [0003] The present invention aims to separate particles with similar magnetic properties but different surface electrical properties. An example of commercial importance is the separation of unburned carbon from fly ash from fossil-fuel combustion. The triboelectric precipitant collects dry pulverized coal fly ash with an average particle size of about 10-30um to prevent its emission into the atmosphere. The fly ash is mainl...

Claims

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Application Information

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IPC IPC(8): B03C1/02B03C1/023B03C7/00B03C7/02H01F1/00
CPCH01F1/0045B82Y25/00B03C1/02B03C7/006B03C7/02B03C1/023
Inventor 罗宾·R·欧德罗塞尔·E·詹姆森
Owner 艾克斯普技术公司
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