KR101792424B1 - Apparatus and method for silica fume densification - Google Patents

Abstract

The dumper silica dumper according to the present invention for shortening the densification time of the silica fume and uniformizing the apparent specific gravity of the silica fume, comprises a dust collector connected to an electric furnace for producing metal silicon or ferrosilicon to collect pure silica fume, A silo for receiving the fume and increasing an apparent specific gravity of the pure silica fume to densify the pure silica fume, a transfer line for transferring the pure silica fume collected in the dust collector to the silo by connecting the dust collector and the silo, And reusing the reusable silica fume that is less than the predetermined apparent specific gravity and reused in the transfer line to mix the pure silica fume and the reusable silica fume in the silo to form the reusable silica fume together with the pure silica fume A re-entry call to make the densification As it includes, it can achieve the effect of improving productivity.

Description

Technical Field [0001] The present invention relates to a silica fume densifying apparatus and method,

The present invention relates to an apparatus and a method for densifying silica fume, and more particularly, to an apparatus and a method for densifying silica fume which increase the apparent specific gravity of silica fume in order to improve the transportation and the workability of the silica fume.

Silica fumes are by-products generated in electric furnaces used for the production of metallic silicon and ferrosilicon, and are amorphous (spherical) silicon dioxide fine particles. Silica fume is widely used as an admixture for concrete. Especially, in order to increase the durability of concrete, 4 - 20% of silica fume is added in many cases and it is effective in measures against salting and sulfuric acid.

The technical background of this effect is the finer particles with average particle size of 0.15 microns, filling the gaps in cement concrete and the pozzolanic reaction with Ca (OH) 2 in cement to form solid CSH (Calciumsilicate) hydrate. There is. The formation of dense structure suppresses penetration and migration of elements that rust the reinforcing steel such as chloride ion, so that the concrete with silica fume is remarkably improved in strength and durability as being called '100 years concrete'. In this regard, silica fume is attracting attention as a material contributing to an environmentally friendly society in the 21st century. In addition, since microsilica is a by-product, there is little conversion amount of CO2 (CO2) related to manufacturing, and the amount of converted CO2 can be reduced by substituting a part of cement.

Since such silica fumes are fine particles having an average particle diameter of 0.15 micrometer, in order to improve the transportation and field workability of silica fumes, a high purification technique and a densification technique for increasing apparent specific gravity are required.

The densification process for increasing the apparent specific gravity can be divided into an initial load-up process and a continuous load-up process. The initial rod-up process is a process for raising the apparent apparent specific gravity of pure silica fume above a predetermined reference value, and means a process of adding pure silica fume to an empty silo without silica fume and raising the apparent specific gravity above the reference value. The continuous rod-up process means the process of discharging densified silica fume by continuously injecting pure silica fume when the apparent specific gravity of the pure silica fume reaches the reference value through the densification process after the start of the initial rod-up process.

However, the conventional densification process has a problem in that productivity is deteriorated because it takes about 20 days for the initial rod-up process, and since the apparent specific gravity of the pure silica fume is not uniform, the silica fume, which is less than the reference specific gravity, .

Korean Patent Publication No. 2015-0047352 (published on May 05, 04, 2015)

It is an object of the present invention to provide a silica fume densifying apparatus and method for shortening a densification process time of silica fume.

It is another object of the present invention to provide a silica fume and densification apparatus and method capable of reusing silica fume that is below an apparent specific gravity reference value in a continuous densification process.

Another object of the present invention is to provide an apparatus and a method for densifying silica fume in which the apparent specific gravity of silica fume is uniformized.

The present invention provides a dumper for silica fume dumper, comprising: a dust collector connected to an electric furnace for producing metal silicon or ferrosilicon to collect pure silica fume; and a cleaner for removing the pure silica fume by increasing the apparent specific gravity of the pure silica fume, A transfer line for transferring the pure silica fume collected in the dust collector to the silo by connecting the dust collector and the silo, and a reusable silica fume reusing material which is less than a predetermined apparent specific gravity, And recycling the pure silica fume and the reusable silica fume in the silo so that the reused silica fume is densified together with the pure siliceous fume.

A densifying air blower connected to the lower end of the silo and supplying air into the silo so that the pure silica fume and the reusable silica fume are densified by static electricity in the silo; And a densification filter disposed between the silo and the densified air blower to supply the air supplied into the silo into the silo with a uniform distribution.

The silica fume densifying device may further include an exhaust fan installed at an upper end of the silo, exhausting the inside of the silo to adjust a pressure inside the silo, and forming an ascending air flow in the silo together with the densified air blower .

The densification filter is made of a mesh net and a porous cloth, and a discharge pipe for discharging the densified pure silica fume may be passed through the center of the densification filter.

The silica fume densifier may further include a vibrator for vibrating a sidewall of the silo to prevent the pure silica fume and the reused silica fume from being fixed to the side wall of the silo.

And a hammer for preventing the pure silica fume and the reusable silica fume from sticking to the sidewall of the silo on the sidewall of the silo by hitting the sidewall of the silo.

Meanwhile, in the method for densifying silica fume according to the present invention, pure silica fume is collected in a dust collector connected to an electric furnace for producing metal silicon or ferrosilicon, and reused silica fume, which is less than a predetermined apparent specific gravity, A silica fume preparing step, a silica fume transfer step of transferring the pure silica fume and the reused silica fume to a silo through a transfer line, and a step of mixing the pure silica fume and the reused silica fume into the silo, And a silica fume densification step in which the silica fume is densified together.

In the silica fume densification step, an air blower connected to the lower end of the silo supplies air toward the inside of the silo, and the air can be supplied into the silo through a densification filter with a uniform distribution.

In the silica fume densification step, the inside of the silo is exhausted by the exhaust fan installed at the upper end of the silo, and the pressure inside the silo is adjusted, and a rising air flow can be formed in the silo.

The densifying the silica fume may prevent the vibrator from vibrating the side wall of the silo so that the pure silica fume and the reusable silica fume are fixed to the side wall of the silo.

The silica fume densification step may prevent the hammer from sticking to the sidewall of the silo so that the pure silica fume and the reusable silica fume are fixed to the side wall of the silo.

The apparatus and method for densifying silica fume according to the present invention have the effect of reusing silica fume which is less than a predetermined apparent specific gravity.

Further, in the apparatus and method for dumping silica fume according to the present invention, when the initial load-up is started and pure silica fume is introduced after the reusable silica fume is introduced into the re-charging hopper, the initial load- Can be shortened within about 20 days to 3 days.

The apparatus and method for densifying silica fume according to the present invention can increase the apparent specific gravity of pure silica fume by uniformly distributing air in the silo and forming a rising air flow in the silo, It is effective.

Fig. 1 is a configuration diagram showing a silica fume densifying apparatus according to the present embodiment.
2 is a flowchart showing a densification method of silica fume according to the present embodiment.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents and modifications may be made thereto .

Hereinafter, a silica fume densifying apparatus according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a configuration diagram showing a silica fume densifying apparatus according to the present embodiment.

Referring to FIG. 1, the silica fume densifying apparatus 100 according to the present embodiment may include a dust collector 200, a transfer line 300, a re-entry hopper 400, and a silo 500.

The dust collector 200 is connected to an electric furnace (not shown) for the production of metallic silicon or ferrosilicon. The dust collector 200 is provided to collect pure silica fume S1 pumped from an electric furnace (not shown). The dust collector 200 includes a hopper having an inclined surface whose inner diameter is gradually reduced toward the lower side and pure silica fume S1 that is collected in the hopper so that the pure silica fume S1 is collected in the hopper, And a rotary valve for discharging the refrigerant to the outside.

The transfer line 300 transfers the pure silica fume S1 collected in the dust collector 200 to the silo 500. The transfer line 300 includes a transfer pipe 310 connected to the silo 500, a branch pipe 330 connected to the dust collector 200 and joined to the transfer pipe 310, and pure silica fume Lt; RTI ID = 0.0 > S1) < / RTI > Although not shown, the branch pipes 330 may be provided with on-off valves for opening and closing the branch pipes 330.

The recycle hopper 400 joins the reusable silica fume S2 to the transfer line 300. The reusable silica fume (S2) is a silica fume that has been found to have undergone at least one densification process and that the silica fume is below the predetermined apparent specific gravity standard value. The silica fume (S1) together with the pure silica fume (S1) .

The re-feed hopper 400 may be connected to the confluent pipe 331 and joined to the feed pipe 310. The reusable silica fume S2 re-introduced into the re-input hopper 400 is supplied to the silo 500 through the transfer pipe 310 and the pure silica fume S1 supplied from the dust collector 200 to the silo 500, ≪ / RTI >

In the silo 500, a densification process of silica fume is performed to increase the apparent specific gravity of the pure silica fume S1 and the reusable silica fume S2.

A densified air blower 510 is connected to the lower end of the silo 500 for densifying the silica fume. A densifying filter 530 is disposed between the densifying air blower 510 and the silo 500. An exhaust fan 550 is installed at an upper end () of the silo 500.

The densified air blower 510 supplies air into the silo 500. The densification filter 530 is made of a mesh net so that the air is supplied into the silo with a uniform distribution. The exhaust fan 550 exhausts the inside of the silo 500. As the air is supplied into the silo 500 and the air is exhausted, the pressure inside the silo 500 is controlled, and a rising air current can be formed in the silo 500. The pure silica fume (S1) and the reusable silica fume (S2) supplied into the silo (500) rises along the rising air stream in the silo (500) and can be densified by the electrostatic force.

In order to prevent the densified pure silica fume S1 from sticking to the inner wall of the silo 500 during the densification process in the silo 500, (570) such as a vibrator that hits the side wall of the silo (500).

A discharge pipe 590 for discharging the pure silica fume S1 after the densification process to the outside of the silo 500 may be connected to the lower end of the silo 500. The discharge pipe 590 may communicate with the interior of the silo 500 through the center of the densification filter 530.

Hereinafter, a method for densifying silica fume according to the present invention will be described with reference to the accompanying drawings.

2 is a flowchart showing a densification method of silica fume according to the present embodiment.

Referring to FIG. 2, the method for densifying silica fumes according to the present embodiment includes a silica fume preparing step (S11), a silica fume transferring step (S13), and a silica fume densifying step (S15).

The silica-fume preparing step (S11) is a step for preparing the pure silica fume (S1) and the reusable silica fume (S2) for the silica fume densification process.

That is, the pure silica fume (S1) is a by-product generated in an electric furnace (not shown) for the production of metal silicon or ferrosilicon, and is collected in the dust collector (200). The reusable silica fume (S2) is a silica fume that has been subjected to at least one densification process and has been found to be below a predetermined apparent specific gravity, and is separately stored in a storage means such as a tone bag. The reused silica fume (S2) 400). ≪ / RTI >

Subsequently, the silica fume transferring step S13 is a step of transferring the pure silica fume S1 and the reusable silica fume S2 to the silo 500.

That is, the transfer line 300 forms a pressure for transferring the pure silica fume S1 to the silo 500. At this time, branch pipes 330 branching from the transfer pipe 310 to the dust collector 200 and the re-entry hopper 400 are opened. The pure silica fume S1 is transferred from the dust collector 200 to the silo 500 through the transfer pipe 310 and the reusable silica fume S2 is transferred from the re-entry hopper 400 through the transfer pipe 310 to the silo 500).

Subsequently, the silica fume densification step (S15) is a step in which the pure silica fume (S1) and the reusable silica fume (S2) are mixed and densified in the silo (500).

That is, the pure silica fume S1 and the reusable silica fume S2 transferred to the inside of the silo 500 can be mixed in the silo 500. At this time, the densifying air blower 510 supplies air into the silo 500. The densification filter 530 allows air to be fed into the silo 500 with a uniform distribution. The exhaust fan 550 exhausts the interior of the silo 500. Accordingly, an upward flow is formed in the silo 500.

The pure silica fume (S1) and the reusable silica fume (S2) mixed with each other generate static electricity, and the apparent specific gravity is increased and the densification proceeds.

The vibrator may vibrate the sidewall of the silo 500 while the densification process is performed inside the silo 500 or the hammer may strike the sidewall of the silo 500 so that silica fumes may be formed on the inner wall of the silo 500 Thereby preventing sticking.

Thereafter, when the densification process is completed, the densified silica fume can be discharged to the outside of the silo 500 through the discharge pipe 590.

As described above, the apparatus and method for pure silica fume densification according to the present embodiment reuse the recycled silica fume S2, which has been densified at least once, rather than the densified silica fume S1, ), The densification step is carried out, and therefore the process time for densifying silica fume can be shortened.

In addition, the apparatus and method for pure silica fume densification according to this embodiment can uniformly distribute the apparent specific gravity of silica fume because air can be uniformly distributed in the silo.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

S1: pure silica fume
S2: Reused silica fume
100: silica fume densifier
200: Dust collector
300: transfer line
400: Re-input hopper
500: Silo
510: Air blower
530: Densification filter
550: Exhaust fan
570: means for preventing sticking

Claims (11)

A dust collector connected to an electric furnace for production of metal silicon or ferrosilicon to collect pure silica fume;
A silo for receiving the pure silica fume and increasing an apparent specific gravity of the pure silica fume to densify the pure silica fume;
A conveyance pipe connected to the silo;
A branch pipe connected to the dust collector and joined to the transfer pipe;
A transfer air blower for forming a pressure necessary to transfer the pure silica fume to the transfer pipe;
The reusable silica fume which is less than the predetermined apparent specific gravity and reused is recycled into the transfer tube to mix the pure silica fume and the reusable silica fume in the silo so that the densification of the reusable silica fume with the pure silica fume A re-feed hopper
And a confluence pipe connected to the recycle hopper and joined to the transfer pipe to allow the reused silica fume to be merged into the transfer pipe. The method according to claim 1,
A densified air blower connected to a lower end of the silo and supplying air into the silo so that the pure silica fume and the reusable silica fume are densified by static electricity in the silo;
And a densification filter disposed between the silo and the densified air blower to supply the air supplied into the silo into the silo with a uniform distribution. 3. The method of claim 2,
Further comprising an exhaust fan installed at an upper end of the silo to exhaust the interior of the silo to control the pressure inside the silo and to form a rising air flow in the silo together with the densified air blower . 3. The method of claim 2,
Wherein the densification filter is made of a mesh net and a porous cloth to crush air supplied into the silo through the densified air blower to generate a flow between the pure silica fume and the reusable silica fume to form the static electricity,
And a discharge pipe for discharging the densified pure silica fume is passed through the center of the densification filter. The method according to claim 1,
Further comprising a vibrator for vibrating a sidewall of the silo to prevent the pure silica fume and the reusable silica fume from sticking to the side wall of the silo. The method according to claim 1,
Further comprising a hammer for preventing the pure silica fume and the reusable silica fume from sticking to side walls of the silo at the sidewall of the silo by striking a side wall of the silo. delete delete delete delete delete

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