JPS5949858A - Sorting device of powder - Google Patents

Abstract

PURPOSE:To provide a titled device simplified in processing stage and used for coal dressing, etc., by generating triboelectricity in powder to be selected, and sorting the powder in accordance with its charged quantities after introducing them to a sorting chamber having a DC electric field. CONSTITUTION:Powder to be sorted such as finely-pulverized coal is fluidized by a gas and are introduced into an electrically charging device 5 to produce a swirling flow in the inside of a cylinder 52. By said flow, the friction caused between the powder and the inner surface of the cylinder 52 produces electric charges on the powder corresponding to the components of the powder, and then the powder is discharged from a discharging port 54. Next, the powder is introduced into a sorting chamber 9 in which a DC electric field is created by a pair of electrodes 901, 902, and are separated in accordance with the charged quantities of them into a high coal fraction, a coal and ash-mixed fraction, and an ash fraction, etc. In the chamber 9, because the electrodes 901, 902 are placed so that their recessed surface sides are faced each other, the intensity of electric field at the end of electrode is made larger to effectively prevent the powder from scattering out of the electrode system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder sorting device that selects and separates only a specific component from a mixture of powders (particles) of class 28 U having different components. This type of equipment is used, for example, for refining ores or refining powder raw materials, and has traditionally been used for refining ores and refining powder raw materials. Since magnetic selection and magnetic selection have been put into practical use,
Conventional methods cannot be said to be effective means for selecting materials with small differences in specific gravity and small differences in magnetic properties. For example, in the case of coal utilization, ash, dehydration, desulfurization, etc. are important issues through various processes such as transportation, combustion, and Fuchsization, and various refining equipment has been developed and put into practical use. As is clear, it was never sufficient.

Regarding conventional coal preparation, methods such as heavy liquid preparation, jig coal preparation, table coal preparation, rheo coal preparation, and flotation have been developed, and recently, oil age precipitation methods have also been developed.

The heavy liquid coal preparation method *7J (Ic) uses an mM liquid in which heavy liquid materials such as magnetite and iron sand are suspended, and this KW coal is suspended or sedimented to separate it into carbonaceous components and mud/stone components. This static coal selection method is usually used as a sorting button for lump charcoal of 7.5 to 50 yen, and is limited to particles with a small particle size (over 3 yen). There is a problem that the existing ash cannot be removed.Also, a heavy liquid phase recovery system is essential for the equipment, which makes the equipment complicated and requires a dehydration and drying process after coal washing.Furthermore, recently, fine powder The demand for pulverized coal for coal burnt ends and fine powder 00M raw material requires pulverization again, which becomes inefficient and uneconomical.

[Other conventional methods] 11 Coal method and 1-1 Jig coal selection method are as follows: The coal is placed horizontally in a water tank with a closed structure, the 17th layer of the net is airtight, the lower PA is made into a palm water chamber, and one of the When raw coal is introduced onto the bed from the end, at the same time + CC ice chamber lower pressure communication - pressurized chamber σ)n: The force is cut off and changed in a rod-like manner, thereby causing the water surface to vibrate up and down. By this operation, by the time the stone reaches the other end, the low specific gravity in the raw coal is transferred to the upper layer, and the high specific gravity is transferred to the TR force, and the upper layer is selectively removed according to the specific gravity, and the coal is cleaned. will be done. This 2-ng porridge charcoal is usually a few IQ
It is widely used as lump coal for mrl, and in the vicinity of I, even fine grain coal with a grain size of about 1 inch can be produced.
, 50, numerous improvements have been made. However, even with this method, there are the same problems as with Mg coal preparation, including the treatment of sludge contained in wastewater;

Next, the table coal selection method and the rheo coal selection method have a problem in that the water is used as a screening medium. Charcoal grade KL can be used, but both have the same problems as heavy liquid coal preparation and jig;-q coal.T-5 flotation coal has a diameter of 0.3 +'
& Powdered coal is used as 9M, and the raw coal is stirred in an aqueous liquid, 9 air is pumped through the water tank P, and the coal particles are stirred. After 4 inches, it is exposed on the surface, leaving mud and stone in the water, and then charred.This method has the advantage that it can be handled in a fine powder form, and is widely used for making candy. However, there are still problems with associated equipment such as pollution, VrIA, and dehydration and drying after coal preparation.

In addition, Oil Apr. 2015, oil door pulverized coal is placed in water for 1 hour.
Make it muddy, -5 to this? The coal particles are agglomerated and granulated using the heavy oil as a binder by mixing and stirring a certain amount of heavy oil, and the coal particles are agglomerated and granulated using the heavy oil as a binder. Even with this method, there are still problems such as the problem of sewage treatment, the consumption of a large amount of M night σ), and the restrictions on the use of granulated coal (・stone).

The present invention eliminates the above-mentioned drawbacks of the conventional edition,
The object of the present invention is to provide a separate apparatus for powder J1 that can omit or simplify the dehydration and drying steps. According to the present invention, the powder particles to be sorted that have been ground into fine powder are subjected to 8 bumps (rubbing by C; The goal is to achieve the purpose by separating the 8 fields of direct current from the ultimate wisdom in the sorting room TTC: 5 according to their bands and amounts.

The present invention will be explained below based on detailed drawings.

Figure 1 also shows this invention O) As an example, a coal preparation process section i? This is what is shown. In this process, raw coal is first crushed into appropriate sizes by a crusher 1, and then e.g. It is stored in the buffer 2. This stored raw coal is sent to a pulverizing mill for three millimeters, where it is pulverized to, for example, 200 mesh or less. In this grinding mill 3, drying or non-combustible gas (used when dry dust generation is expected) is passed in the directions shown by broken lines 31 and 32 as necessary to keep the powder dry. be done. The pulverized and dried powder is fed to a fixed amount (Jt feeder 1) as shown by an arrow 41.
21 stones led to.

UtP supply, - P\ro 421 from Kuba - the stone powder sent out is the obi! A value (C) corresponding to the processing speed of the device 5 is maintained. In the charging device 5, the powder particles collide with the solid surface as described below. After receiving the goods, they were sent to Atsushi City Annex 9.

Silence! In separation room 9, X-ne Zf J1%! 1 (-ζ is separated into high carbon content, J-J ash mixed content, and ash content, and the high-charcoal juice is indicated by arrow 91 ↓ As a sea urchin fillet product, 1?
The strawberry is separated and seamed as shown by arrow 93, and the waste is removed and disposed of.

The charcoal/ash mixture is disposed of as crystal form or waste in the metering feeder 1 as shown by arrow 92 to enter the weigher.

Next is the obi! I would like to confirm about device 5. Powder σ) Frictional electrification method can be used in various ways.
When fed at a speed of -f, a swirling flow as shown by the arrow 55σ is generated inside the cylinder 52, and the powder particles are separated from the gas flow by centrifugal force and create intermediate friction with the inner surface of the cylinder 52.
After being charged and discharged, the particles are discharged from the powder supply port 502 (lj) while sending gas from the lower part of the fluidization tank 501 at an appropriate speed as shown in Fig. 3. The powdered bamboo shoots repeatedly collide with each other, acquire a frictional charge, and are discharged from the particle discharge port 503 at the upper end of the fluidization tank 501.

Furthermore, as shown in FIG.
The ladle generates sliding friction ~ between the surface of the rotating body and obtains a frictional charge.

As mentioned above, powder particles can be given a triboelectric charge by various methods, but according to the results of experiments, it has been found that even when particles of the same component collide, they are charged to opposite polarities. Therefore, it is effective as a charging device for a sorter that avoids collisions between powder particles and utilizes collisions between particles and solid surfaces.By the way, particles and solid surfaces that reduce collisions between particles When using collision between particles, it is necessary to discharge the charged particles to the outside of the dispersed charging device (for example, in Figure 2, if the particle outlet is narrowed like a normal dust collection cyclone, the charged particles will become extremely charged). performance will be degraded).

For this reason, it is inevitable that the charged particles discharged from the device will be scattered over a considerable distance around the charging device.

The electrode configuration for electrostatic 8 separation, which is the main subject of the present invention, will be explained below. FIG. 5 is an example of a view projected onto a horizontal plane of tracks of particles discharged from two representative points of the charging device 5. The broken line 511 is an example where there is no DC electric field E, and the case is the same for both positively charged particles and negatively charged particles. 'JiFI51
2 and 513 are examples of tracks of positively charged particles and negatively charged particles, respectively, when a DC electric field E is present. As is clear from the figure, if one tries to capture these 5JR particles using a parallel plate electrode, a wide electrode is required, which greatly reduces the space required for seedlings. Furthermore, as shown in FIG.
o and the back surfaces of the electrodes 91 and 92, resulting in a decrease in sorting efficiency and an increase in maintenance costs.

FIG. 7 shows the electrode configuration of the present invention, in which electrodes 901.
The horizontal cross section of 902 is curved, and they are arranged so that the concave sides of each other turn around. In this electrode configuration 1, the field strength E at the edge of the electrode is large (because it becomes thicker, it is possible to effectively prevent particles from scattering and flowing out of the heptadole system, and the It was found that sufficient i'i17X'Q particles could be captured with the corresponding electrode width.

By using this '1:i 4ti and the charging device shown in FIG. When a sorting experiment was carried out on coal with an ash content of 20 parts crushed to less than 20%, refined coal with an ash content of 9 parts was obtained on the cathode side, and high ash coal with an I/c ash content of 15 parts on the anode side was obtained. At this time, the amount of scattering outside the W habit system was less than 1%.

In addition, in the multi-stage sorting using this apparatus R3&, refined four-charcoal with an ash content of 5%, a hard content with an ash content of 85, and an intermediate with an ash content of 30% were obtained.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of a sorting device for coal, which is an example of A: U-Ming 12, and Figures 2, 3, and 4 are ':1i'' kl equipment Q) Each is different. Figure illustrating an example, i
Figure 135 is a diagram showing an example of the trajectory of particles discharged from the charging device, Figure 6 is a diagram showing how the sorting chamber is contaminated by particles that cannot be captured by the electrode, and Figure 7 is the configuration of the sorting bar according to the present invention. 5
[Z, which is a diagram showing 1. 1... crusher, 2... hopper, 3... crushing mill,
4...Constant supply feeder, 5 River zone mounting sound, 9...Electrostatic separation chamber, 51.Powder gas mixture person [], 52...Cylinder, 53...Gas outlet, 54.・・Particle emission [], 5
Q+...Fluidization tank, 502...Ia body supply 18 "1
．． 5o3...Particle p"exit, 51o...Irotrotor, 9
0, 900 =-・Outer wall, 91, 92, 901
, 902-W, pole. ft@, 54 cm,! i closed size 5 (2) sasu flash off flash

Claims (1)

[Claims] 1) When a mixed powder consisting of two or more different components is separated and sorted for each specific component, the particles are charged by a collision between the powder scoop and the solid surface. and a sorting section consisting of a pair of electrodes with concave sides facing each other, each having a curved horizontal cross section.
A powder sorting device characterized in that a DC voltage is applied to the electrode pair to electrostatically separate and sort the charged particles sent out from the band π1' portion according to their charge, the size and polarity of each charge.