KR20020046063A - Apparatus for treating high zinc sludge for the blast furnace - Google Patents

Abstract

PURPOSE: An apparatus for treating high zinc sludge for a blast furnace is provided which produces slurry cake by diluting and dehydrating high zinc sludge contained in slurry of blast furnace gas. CONSTITUTION: The apparatus for treating high zinc sludge for a blast furnace comprises a centrifugal machine(30) for separating high zinc sludge from slurry; a dilution tank(40) diluting high zinc slurry supplied from the centrifugal machine(30); a coagulant feeding device(100) for feeding coagulant into the dilution tank(40); and a hydroextractor(50) producing sludge cake by dehydrating a mixture of high zinc sludge supplied from the dilution tank(40) and coagulant in a centrifuge method, wherein the apparatus further comprises a mixing chamber which is installed at the inlet side of the dilution tank(40) so as to premix high zinc sludge supplied from the centrifugal machine(30) with coagulant supplied from the coagulant feeding device(100), the hydroextractor(50) comprises a cylinder part in which sludge cake is accumulated by dehydrating the mixture, a motor for rotating the cylinder part and an inverter controller for controlling the number of revolutions of the motor, the number of revolutions of the motor of the hydroextractor(50) is controlled through the inverter according to a moisture content contained in sludge cake, a cone part inside the dilution tank(40) is manufactured in a cone shape having 45 degrees of an angle or more, and a centrifuge nozzle installed at the end of a supply pipe for supplying high zinc sludge into the dilution tank(40) is spaced apart from the inner surface of the dilution tank(40) in a distance of 50 mm or more and faces toward a circumferential direction.

Description

Apparatus for treating high zinc sludge for the blast furnace}

The present invention relates to an apparatus for treating a slurry produced in the process of purifying blast furnace gas produced in a blast furnace process for producing molten iron in steelworks, and more specifically, to dilute high zinc sludge contained in the slurry of blast furnace gas. It relates to a high zinc sludge treatment apparatus for dewatering to produce a sludge cake.

In general, the blast furnace process inputs coke, which is fuel, iron ore, and raw materials, which are fuels, through a charge hopper on the top of the blast furnace 10, and high temperature (approximately 1200) through 34 tuyere 11 installed under the blast furnace 10. It is a process of producing molten iron by blowing hot air of ℃). At this time, the blast furnace gas generated during the reduction process of the iron ore is introduced into the dust catcher, which is a dry dust generator 12, through a connection pipe of the upper portion of the blast furnace.

In the dry vibration damper 12, coarse dust is accumulated at the bottom by gravity settling, and some particulate dust is again passed through the connecting pipe to the Bischoff Scrubber, which is a wet vibration damper 13. The wet vibration suppressor 13 cleans the blast furnace gas so that a large amount of dust can be sprayed on the particulate dust to be cleaned and reused as fuel.

In addition, the dust-collecting dust containing the particulate dust used in the wet vibration damper 13 is introduced into a large-scale thickener pond 20 which is a gas clean water treatment facility through the dust-collecting discharge passage 14 to be treated. That is, in the Seekner Pond 20, the dust contained in the dust collection is concentrated in a slurry (slurry) state in the lower portion of the Seekner Pond 20 by the settling agent to be separated from the dust collection.

On the other hand, in order to separate the high zinc sludge containing a large amount of zinc (Zn) from the concentrated slurry, as shown in FIG. 2, first, the diatomaceous earth of white powder from the diatomaceous earth storage tank 93 to the stirring tank 91. Predetermined amount is added, and diluted water is added and stirred. Then, underpressure is generated by the operation of the vacuum pump 94 toward the drum filter 90 (Drum filter) side to attach diatomaceous earth to the drum filter 90 surface. At this time, a horizontal cutting knife (not shown) is used to uniformly attach the diatomaceous earth. And a high zinc sludge is thrown into the stirring tank 91, and a sludge cake is produced.

However, in order to produce the sludge cake as described above, the operator has to continuously attach the diatomaceous earth powder to the surface of the drum filter at predetermined time intervals, and the amount of the high-zinc sludge cake is extremely small, and is discharged without being processed in the stirring tank. Since the high zinc sludge was continuously circulated in the dust collecting system, the increase of the zinc content during the recycling of the blast furnace sludge had an adverse effect on the increase of deposits in the furnace.

The present invention has been made in order to solve the conventional problems as described above, in order to completely collect the fine particles of the high-jink sludge separated from the slurry, a flocculant is added and concentrated in a dilution tank and then put into a centrifugal separator to go-jink The purpose of the present invention is to provide a high-jink sludge treatment apparatus that can minimize the zinc content of blast furnace recycled sludge by separating the sludge and the filtered water and treating them in a landfill to improve the separation efficiency of a large amount of high-ink sludge.

1 is a schematic diagram showing a blast furnace gas treatment process of a typical blast furnace process.

2 is a view showing a sludge cake producing apparatus according to a conventional embodiment.

Figure 3 is a block diagram showing a high zinc sludge treatment apparatus according to the present invention.

4 is a view showing a dilution tank of a high zinc sludge treatment apparatus according to the present invention.

Figure 5 is a block diagram showing the process of producing a sludge cake in accordance with the present invention.

<Description of Symbols for Major Parts of Drawings>

22: high zinc sludge discharge pipe

22a: Centrifugal nozzle

25: mixing chamber

30: centrifuge

40: high zinc sludge dilution tank

50: dewatering device

51: drive motor

100: flocculant input tank

In order to achieve the above object, according to the present invention, the apparatus for treating high-ink sludge in the slurry produced in the blast furnace gas purifying process, and a centrifuge for separating the high-ink sludge from the slurry, and from the centrifuge A dilution tank for diluting the supplied high zinc sludge, a flocculant input device for injecting a flocculant into the dilution tank, and a mixed water of the high zinc sludge and the flocculant supplied from the dilution tank are dewatered by centrifugation to produce a sludge cake. It is characterized by consisting of a dehydration device.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

According to the present invention, the slurry concentrated in the blast furnace treatment 20 for the blast furnace gas is supplied to the centrifuge 30, and the centrifuge 30 is a concentrated slurry that has a relatively high specific gravity due to the specific gravity difference. Is separated from and supplied to the dilution tank 40 through the discharge pipe 22 at the top of the centrifuge 30.

In order to dilute and coagulate the high zinc sludge in the dilution tank 40, a flocculant is introduced from the coagulant supply tank 100. The mixed water mixed with the high zinc sludge and the flocculant is supplied from the dilution tank 40 to the centrifugal dewatering device 50 and dewatered, resulting in a sludge cake.

Meanwhile, referring to FIG. 4, a mixing chamber 25 for preliminarily mixing the high zinc sludge and the flocculant is provided at the inlet side of the dilution tank 40.

3 to 5, the production process of the sludge cake will be described in detail.

First, the high zinc sludge dilution tank 40 used for separating a high zinc sludge cake, a coagulant input device, and a dewatering device 50 will be described.

In order to more efficiently concentrate the high zinc sludge containing the predetermined moisture, the inclination angle of the cone portion of the dilution tank 40 is preferably maintained at 45 degrees or more. This is because if the sludge stays in the dilution tank for a long time before the dilute high zinc sludge is introduced into the dehydration device 50, the relatively high specific gravity contained in the high zinc sludge accumulates at the bottom of the dilution tank, thereby diluting the high zinc. This is to prevent the sludge from being discharged.

At the inlet side of the dilution tank 40, a mixing chamber 25 for preliminarily mixing the high zinc sludge and the flocculant is provided. In the mixing chamber 25, when a coagulant is introduced into the dilution tank 40, a high-pressure sludge discharged from the centrifuge 30 falls more than the pressure acting by falling from the upper portion of the discharge pipe 22. By supplying a predetermined amount of coagulant from the coagulant supply tank 100 through the pump 95, the coagulant is brought into contact with the components of the sludge fine particles in the high zinc slug discharge pipe 22 to dilute and settle the high zinc sludge. Double

The high zinc sludge discharge pipe 22 in the dilution tank 40 is attached to the wall of the dilution tank 40 to install a centrifugal nozzle 22a at the cone, while maintaining a distance of 50 mm from the shell. It should be desirable. This is to allow the mixed water mixed with the high zinc sludge in the coagulant mixing chamber 25 of the upper pipe to apply the rotational force in the circumferential direction as it strikes the cone portion of the dilution tank. That is, to allow the mixed water in the dilution tank 40 to continue to rotate in the circumferential direction.

In order to separate the water from the above-described high zinc sludge, a screw type centrifuge 50 and a drive motor 51 are provided and an inverter controller capable of controlling the drive motor 51 is provided. At this time, in consideration of the fact that the constituent characteristics of the blast furnace thinner slurry has a heavy specific gravity, it is possible to control the rotation speed of the low speed at the first start and stop.

The lower end of the mouth of the dewatering device 50 is installed with a filtered water discharge pipe 55 for discharging the filtered water, the discharge pipe 55 is connected to the filtered water storage pond 56 to store the filtered water. In addition, the lower portion of the dewatering device 50 is provided with a discharge dama and chute (52) to discharge the high-jink sludge cake.

Referring to the process of separating the high-ink sludge cake using the apparatus and structure configured as described above are as follows.

As described above, in the centrifuge 30, the low zinc sludge and the high zinc sludge are separated through different discharge pipes. The high zinc sludge is preliminarily mixed with the coagulant supplied from the coagulant supply tank 90 through the coagulant pipe 90a in the mixing chamber 25 through the discharge pipe 22.

In the mixing chamber 25, the mixed water mixed even with the fine sludge component drops to the wall side in the sludge dilution tank 40 through the discharge pipe extending to the lower end, and to the centrifugal nozzle 22a attached to the distal end of the discharge pipe 22. By rotation in the circumferential direction. The mixed water is automatically mixed in the dilution tank 40 while rotating, and a predetermined amount is discharged to the discharge device 50 through the discharge pipe at the bottom of the dilution tank 40.

At this time, an inverter is installed to control the rotation speed at the initial start and stop of the drive motor 51 of the discharge device 50 at the lowest speed before the discharge of the mixed water. As described above, controlling the operation of the driving motor 51 at a low speed by using the inverter is because the facility can be protected during rapid braking due to the Fe component of 40% or more contained in the sludge component.

When the mixed water flows into the dewatering device 50, the mixed water is dewatered by the operation of the driving motor 51, and the resulting sludge cake is discharged through the discharge chute 52 of the dewatering device.

On the other hand, as described above, the rotation speed adjustment in the inverter controller is made according to the self-containing moisture content of the high-ink sludge cake, as shown in Table 1 below. For example, in order to prevent environmental pollution when water content is 50 ~ 55%, the setting speed is set upward from 1950 ~ 1300rpm from the reference speed of 950 ~ 1000rpm, so that high zinc sludge of 40% or less without affecting environmental pollution Create a cake. In addition, even under other circumstances, when the water content is 40 to 50%, the set speed is controlled up to 310 to 1410 rpm in order to reach the target moisture content.

Therefore, according to the present invention, by producing a high-jink sludge cake using a centrifugal dewatering device, by improving the quality of the recycled sludge to stabilize the furnace blast furnace not only contribute to the productivity of the blast furnace, but also perfect landfill sludge cake It is practically effective to prevent environmental pollution by separating it.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. It should be recognized.

Claims (5)

In the apparatus for treating the high zinc sludge in the slurry produced in the blast furnace gas purifying process, A centrifuge for separating high zinc sludge from the slurry, A dilution tank for diluting the high zinc sludge supplied from the centrifuge, A flocculant input device for injecting a flocculant into the dilution tank; And a dehydrating device for producing a sludge cake by dehydrating the mixed water of the high zinc sludge and the flocculant supplied from the dilution tank by a centrifugal separation method. The method of claim 1, And a mixing chamber for premixing the high zinc sludge supplied from the centrifuge and the coagulant supplied from the coagulant injector at the inlet side of the dilution tank. The method of claim 1, The dewatering device comprises a cylindrical portion for dewatering the mixed water to accumulate sludge cake, and a motor for rotating the cylindrical portion, further comprising an inverter controller for adjusting the rotational speed of the motor. Zinc sludge treatment unit. The method of claim 3, The rotation speed of the motor of the dewatering device is a high-jink sludge treatment apparatus, characterized in that adjusted through the inverter in accordance with the amount of water contained in the sludge cake. The method of claim 1, The cone portion inside the dilution tank is made in the form of a cockle of 45 ° or more, and the centrifugal nozzles installed at the end of the supply pipe for supplying the high zinc sludge to the dilution tank are spaced at least 50 mm apart from the inner surface of the dilution tank and are directed in the circumferential direction. High zinc sludge treatment apparatus, characterized in that.