KR20160029178A - Method and system for drying high moisture- ultrafine sludge with precious metal and method for manufacturing sinter material - Google Patents

Abstract

Introduced are a method and a system for drying high-moisture and ultrafine sludge having precious metal and a method for producing a sinter material using a sludge having precious metal. The method for drying high-moisture and ultrafine sludge having precious metal allows mixed sludge, which is formed by mixing first sludge, second sludge, and third sludge, to be dried to have the percentage of moisture content of less than or equal to 10% (except for 0%), wherein the first sludge has the percentage of moisture content of 16-25%, wherein the second sludge has the percentage of moisture content of 30-36% and has a particle diameter smaller than the first sludge, and wherein the third sludge has the percentage of moisture content of less than or equal to 3% (except for 0%) and has latent heat.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying method and a sludge drying method using a sludge containing a precious metal,

The present invention relates to a method for drying a very fine sludge containing a valuable metal and a system thereof, and a method for producing a sintered raw material using a very fine sludge of high water content containing a valuable metal. More specifically, the present invention relates to a fine sludge A method and system for drying a highly sludge of high water content by drying a mixed sludge by mixing the sludge and drying the mixed sludge by using a latent heat of the dried mixed sludge to lower the water content of the mixed sludge before drying, The present invention relates to a method for producing a raw material for sinter by using a sludge having a very fine particle size.

Recently, the research and development of Finex sludge and the recycling of oil resources, which are included in the existing steelmaking sludge, are being actively carried out in the steelmaking process.

Thus, for the recycling of FINEX sludge and steelmaking sludge, it is necessary to form pellets having a high oil content (Fe), a low harmful component and a certain level of strength or more. To this end, a pretreatment process Do.

The amount of water contained in the sludge should be controlled within a certain range, the content of harmful components should be controlled to a certain amount or less, and the particle size should be more than a certain level.

As the pretreatment method, a natural curing method that simply mixes dust with low water content and byproducts (sludge, iron oxide, scale and the like) having a high water content in advance and ages them is utilized, and a dryer that compulsorily lowers the water content of the mixed raw material is utilized The dryer adjusts the water content of the raw material by direct drying the sludge in the dryer using gas and refined oil as a heat source.

On the other hand, various methods such as a method of passing the dust through a hydrator for controlling the water content to shorten the hydration reaction of the dust are used for controlling the water content.

If the sludge containing a large amount of water is cured naturally or mixed with dust and dried, it is necessary to have a large area for storing the raw materials before and after the drying, and to ensure that the dried raw material has sufficient moisture content to form pellets And there are various problems that require separate facilities and processes in order to prevent water content decrease during storage.

Particularly, in the case of FINEX sludge, which is formed of fine particles and contains high water content, the sludge is easily formed due to uneven agglomeration in addition to the above-mentioned problems, and it takes a long time to dry naturally, There are disadvantages.

On the other hand, there are rotary dryer kiln type, duct type, indirect type steam type disk type, and the like, which are commonly used as dryers.

In the case of direct flush method, when the condensed sludge is forcibly dried, a large amount of adhering light is generated on the inner wall of the device, and when the carbon contained in the sludge is introduced into the dust collector and adsorbed and accumulated in the dust bag filter, So that it may act as a cause of fire occurrence.

In order to reduce the moisture content of the raw material, it is necessary to use the ferrother unit to reduce the moisture content of the raw material in a limited space. There is a disadvantage that not only the operation is delayed but also the continuous operation of the drying equipment becomes impossible.

As described above, when using the current method for drying the pulverized sludge, the drying efficiency is lowered and moisture control of the raw material is not smooth, resulting in obstruction of pellet processing, so that it becomes difficult to obtain an optimum product.

In case of indirect method, it is applicable to sewage sludge which is mainly used for general sewage sludge with less sludge lumps, but it is difficult to dry sludge having special sludge characteristics such as fine particulate and high water content.

Fine sludge which is a differential sludge and contains a large amount of water contains valuable metals such as T. Fe and C but it is poor in usability and workability due to fine particulate shape and high water content and the steel sludge has a high Zn content Since it does not satisfy the criteria of Zn: 0.5% or less, which is the application standard in the sintering process, it is difficult to mix pretreatment with finishing sludge having a large amount of Zn component and fine sludge with currently used equipment.

Prior arts include various sludge drying methods and methods, such as Korean Patent Publication No. 2012-0084226 (July 27, 2012), Korean Patent Publication No. 2012-0084220 (July 27, 2012), Korean Patent Publication No. 2005-0106799 Apparatus, etc. However, these prior art techniques are not suitable for pretreating fine sludge containing fine and high water content as a raw material for pellets. The present inventors have found that an optimal method for recycling the FINEX sludge And devices.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as adhering to the prior art already known to those skilled in the art.

Korean Patent No. 2012-0084226 (July 27, 2012) Korean Patent No. 2012-0084220 (July 27, 2012) Korea Patent Publication No. 2005-0106799 (November 11, 2005)

The present invention has been made to solve such conventional problems, and it is an object of the present invention to provide a method and system for drying a very fine sludge containing a valuable metal so as to efficiently dry highly sludge highly sludge as a raw material for sintering, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for producing a raw material for sinter using a highly sludge of high water content.

In order to accomplish the above object, the present invention provides a method for drying a highly particulate sludge of high water content containing a valuable metal according to the present invention, comprising a first sludge having a moisture content of 16 to 25% and a second sludge having a moisture content of 30 to 36% Is mixed with a third sludge having a moisture content of 3% or less (excluding 0%) and a latent heat, and the mixed sludge is dried to have a water content of 10% or less (excluding 0%).

The mixed sludge is characterized in that the first sludge, the second sludge, and the third sludge are mixed to adjust the water content to 15 to 20% and then dried.

The first sludge feeds and feeds the sludge generated in the steelmaking process, and the second sludge feeds and feeds sludge generated in the finishing process.

The mixed sludge dried to a moisture content of 10% or less (excluding 0%) is classified into sludge having a water content of 3% or less (excluding 0%) and sludge having a water content of 8 to 10% And the sludge is supplied to the third sludge.

Preparing a first sludge having a particle size of 0.83 to 1 mm; Preparing a second sludge having a particle size of 0.2 to 0.38 mm; Preparing the third sludge; Mixing the first sludge, the second sludge, and the third sludge to produce a mixed sludge having a water content of 15 to 20%; Drying the mixed sludge at a moisture content of 10% or less (excluding 0%), sorting the dried mixed sludge at a moisture content of 3% or less (excluding 0%) and 8 to 10%; And supplying water to the third sludge having a moisture content of 3% or less (excluding 0%) in the dried mixed sludge.

The first sludge is 10 to 30 wt%, and the second sludge is 70 to 90 wt%.

The dust contained in the exhaust gas generated during the drying of the mixed sludge is collected and supplied at the time of manufacturing the mixed sludge.

And removing the carbon component contained in the exhaust gas generated in drying the mixed sludge, and then collecting the dust.

And the mixed sludge is indirectly dried by steam.

The mixed sludge is dried at a temperature of 150 to 200 ° C. for 10 minutes or more.

In order to accomplish the above object, the present invention provides a highly sludge drying system of high water content containing a valuable metal, comprising a first sludge having a water content of 16 to 25% and a second sludge having a moisture content of 30 to 36% And a third sludge having a water content of 3% or less (excluding 0%) and a latent heat, to prepare a mixed sludge having a water content of 15 to 20%; And the mixed sludge is supplied from the mixer and dried to prepare a sludge having a moisture content of 10% or less (excluding 0%) and supplying the third sludge having a water content of 3% or less (excluding 0%) to the mixer, And 10% of the sludge is classified into the third sludge and discharged separately.

A cyclone that receives the exhaust gas discharged from the dryer and filters the carbon component, and a dust collector that receives and collects the exhaust gas passing through the cyclone.

And the dust collector and the mixer are connected by a transfer line so that the dust recovered from the dust collector can be supplied to the mixer.

The dryer includes an outer housing having a raw material inlet through which the mixed sludge supplied from the mixer flows and an exhaust outlet through which the exhaust gas evaporated in the mixed sludge flows out; An inner housing having an outer circumferential surface spaced apart from an inner circumferential surface of the outer housing by a predetermined distance, a hollow space formed therein, a steam supply pipe connected to one end thereof, And a motor connected to the disc to allow the disc to rotate.

A disc-shaped disc is protruded in the circumferential direction on the outer circumferential surface of the inner housing, and a transfer blade is coupled to an outer circumferential surface of the disc so that the mixed sludge can be transferred .

A first outlet for discharging a part of the mixed sludge is formed at a lower end of the outer housing, and a second outlet for discharging the remaining portion of the mixed sludge is formed at one end of the outer housing.

To achieve these objects and other advantages in accordance with the purpose of the present invention, there is provided a method for producing a raw material for sinter using highly refined sludge containing a valuable metal according to the present invention, comprising a first sludge having a water content of 16 to 25% and a second sludge having a water content of 30 to 36% The mixed sludge obtained by mixing the second sludge having a particle diameter smaller than that of the sludge and the third sludge having a moisture content of 3% or less (excluding 0%) and having a latent heat is dried to have a water content of 10% or less (excluding 0% The pellet is formed into a pellet.

A method for producing a raw material for sinter using a highly sludge of high water content containing such a valuable metal includes the steps of preparing a first sludge having a particle size of 0.83 to 1 mm and a water content of 16 to 25% Preparing a second sludge having a particle size of 0.2 to 0.38 mm and a water content of 30 to 36%; Preparing a third sludge having a water content of 3% or less (excluding 0%) and having a latent heat; Mixing the first sludge, the second sludge, and the third sludge to produce a mixed sludge having a moisture content of 15 to 20%; Drying the mixed sludge at a moisture content of 10% or less (excluding 0%), sorting the dried mixed sludge at a moisture content of 3% or less (excluding 0%) and 8 to 10%; And supplying water to the third sludge having a moisture content of 3% or less (excluding 0%) in the dried mixed sludge; And 3 to 9 parts by weight of a binder to 100 parts by weight of a mixed sludge having a water content of 8 to 10%, and molding the pellet with a compression strength of 30 kgf / cm 2 or more and a particle size of 2 to 10 mm.

The first sludge feeds and feeds the sludge generated in the steelmaking process, and the second sludge feeds and feeds sludge generated in the finishing process.

Wherein the first sludge is 10 to 30 wt%, the second sludge is 70 to 90 wt%, and the mixed sludge is indirectly dried by steam at a temperature of 150 to 200 DEG C for 10 minutes or longer .

According to the present invention, various effects can be obtained as follows.

First, there is an advantage that sludge of high water content and extremely fine sludge can be produced in a recyclable state.

Second, there is an advantage that the generation of adhering light in the drier is prevented during the drying of the high-water and ultra-fine sludge, and the aggregation phenomenon is prevented.

Third, there is an advantage that waste heat of dried sludge can be recycled.

Fourth, there is an advantage of preventing the occurrence of fire in the dust collector.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a system for drying a highly particulate sludge of high water content containing a valuable metal of the present invention,
FIG. 2 is a graph showing the change in water content of the mixed sludge according to the drying time according to the method for drying a very fine sludge of high water content containing a valuable metal of the present invention,
3 is a view showing a drying device, which is a part of a highly-particulate sludge drying system containing a valuable metal of the present invention,
4 is a flow chart of a method for producing a raw material for sinter using a high-volume ultra-fine sludge containing a valuable metal of the present invention.

Hereinafter, referring to the accompanying drawings, a method of drying a highly particulate sludge containing a valuable metal according to a preferred embodiment of the present invention and a system thereof, and a method of manufacturing a sintered raw material using a very fine sludge of a high- The method will be described.

Hereinafter, a drying system of a sludge containing a valuable metal of the present invention will be described, and its production method will be described together.

As shown in FIG. 1, the extreme-fine sludge drying system containing a valuable metal of the present invention includes a mixer 100 and a dryer 200.

The first sludge and the second sludge are supplied to the first hopper H1 and the second hopper H2, respectively.

The first sludge is preferably a sludge having a water content of 16 to 25% and a particle size of 0.83 to 1 mm, and is preferably supplied with sludge generated in the steelmaking process.

The second sludge is preferably a sludge having a water content of 30 to 36% and a particle size of 0.2 to 0.38 mm, and is preferably supplied with sludge generated in the Finex process. The second sludge contains high water content relative to the first sludge, It has the property of fine grain.

When the first sludge and the second sludge are steel sludge and fine sludge, respectively, the composition of the components contained in each sludge is as shown in Table 1 below,

division T.Fe
(Total Fe) C Al2O3 Alkali Zn The first sludge
(Steelmaking sludge) 59.2 1.76 0.41 0.23 0.93 The second sludge
(FINEX
Sludge 47.1 12.9 4.5 0.3 0.06

As shown in Table 1, the first sludge and the second sludge contain a large amount of valuable metal. If such a valuable metal is recovered and recycled, economical efficiency will be improved. The second sludge contains a very fine fine powder There is a disadvantage that the pretreatment process is difficult and the first sludge contains zinc above the recycling standard value (Zn: 0.5 or less) and must undergo a zinc removal process during recycling.

The present inventors have solved the above-mentioned problems by using the latent heat of the dried mixed sludge by mixing the first sludge and the second sludge, and have also found a way to reduce energy consumption in the pretreatment process.

The first sludge and the second sludge supplied to the first hopper H1 and the second hopper H2 are supplied to the mixer 100. [ Considering the mixing efficiency, the drying efficiency in the dryer 200 to be described later, and the moisture content of the final product, the first sludge is supplied in an amount of 10 to 30% by weight and the second sludge is supplied in an amount of 70 to 90% It is preferable to mix them.

The weight percentages of the first sludge and the second sludge are the values including the weight percent of the first sludge and the second sludge contained in the third sludge supplied from the mixed sludge.

The mixer 100 mixes the first sludge supplied from the first hopper H1 with the second sludge supplied from the second hopper H2 and the third sludge supplied from the dryer 200 and having latent heat, .

The third sludge supplied from the dryer 200 is supplied to the mixer 100 with latent heat. The water content of the third sludge is about 1 to 3%. Even if the third sludge is 1% or less, And the temperature of the third sludge is about 80 to 100 ° C.

As described above, the mixer 100 mixes the first sludge, the second sludge, and the third sludge supplied from the dryer 200 to produce a mixed sludge having a water content of 15 to 20% 2 sludge, as well as the zinc content above the reference value contained in the first sludge is regulated below the reference value.

When the mixed sludge is completed in the mixer 100, the mixed sludge is supplied to the dryer 200. In the dryer 200, the mixed sludge is dried and separated into two kinds. The mixed sludge having a moisture content of 8 to 10% is discharged and used as a raw material for sintering. The mixed sludge having a moisture content of 3% is supplied to the mixer 100 So as to serve as a third sludge.

The mixed sludge is preferably dried by indirect heating using steam.

In direct drying method, since hot air is directly contacted with sludge and sludge clustering and attachment light are generated in many ways, it is difficult to control water content, and since a large capacity facility for producing hot air and discharging exhaust gas must be secured, And there is a disadvantage that the particle size of the product is uneven because heat can not be uniformly supplied to the mixed sludge.

On the other hand, the indirect heating method using steam is a method of heating the disk by steam heat and transferring it to the sludge as an intermediary and drying it, so that the water content can be easily controlled, the sludge accumulation and the adhered light generation can be minimized, It is possible to produce a product, and since there is no need for a facility for producing hot air, it is advantageous that the installation space is not limited.

The mixed sludge is preferably dried at a temperature of 150 to 200 DEG C for 10 minutes or more.

FIG. 2 is a graph showing the water content of the mixed sludge when the mixed sludge is dried at a temperature of 150 to 200 ° C. To obtain the mixed sludge having a moisture content of 10% or less, And the temperature of the third sludge.

The extreme-fine sludge drying system of high water content containing the valuable metal of the present invention preferably further comprises a cyclone 300 and a dust collector 400.

The exhaust gas is discharged when the mixed sludge is dried in the dryer (200).

The dust collector 400 collects the dust contained in the exhaust gas and supplies the collected dust to the mixer 100. The dust collector 400 and the mixer 100 are connected to the transfer line 500, So that dust can be transferred to the mixer 100.

Further, the exhaust gas generated when the mixed sludge is dried contains a large amount of carbon components. When such a high temperature carbon component is adhered to the bag filter of the dust collector 400, it may cause a fire. In the present invention, The cyclone 300 is installed in the exhaust gas flow line between the dust collector 400 and the drier 200 so as to filter the carbon contained in the exhaust gas.

Hereinafter, referring to FIG. 3, a dryer, which is a sunshade of the present invention, will be described.

The dryer 200 of the present invention includes an outer housing 210, an inner housing 220, and a motor (not shown).

The outer housing 210 is maintained in a fixed state and a raw material inlet 200a is formed on one side of the upper end so that the mixed sludge supplied from the mixer 100 can be introduced. In addition to the raw material inlet 200a, An exhaust gas outlet 200b is formed so that the generated exhaust gas can be discharged.

A carrier air inlet hole 200c is formed in the outer housing 210 to supply air so that the moisture evaporated from the mixed sludge can be quickly discharged to the outside of the dryer 200. A part of the mixed sludge is discharged at the lower end thereof A first outlet 200d is formed and a second outlet 200e through which the remaining portion of the mixed sludge is discharged is formed at one end thereof.

Mixed sludge having a moisture content of 8 to 10% suitable for use as a raw material for sinter is discharged as the first outlet 200d and sludge having a water content of 3% or less is discharged as a second outlet. The third sludge is discharged to the mixer 100 Or a part thereof is supplied for the sintering raw material.

The inner housing 220 is formed with an outer circumferential surface spaced apart from the inner circumferential surface of the outer housing 210 by a predetermined distance. An empty space is formed in the inner housing 220. A steam supply pipe 230 is connected to one end of the inner housing 220, .

The inner housing 220 and the outer housing 210 are formed to have a concentric circular cross section having different diameters. The inner housing 220 is connected to the motor and rotates.

A plurality of discs 222 are formed on the outer circumferential surface of the inner housing 220 in a circumferential direction at predetermined intervals in the longitudinal direction of the inner housing 220, The transfer blade 224 is coupled to the outer circumferential surface of the disk 222 so that the sludge can be transferred.

Meanwhile, the steam flowing into the empty space of the inner housing 220 heats the inner housing 220, and the mixed sludge supplied to the space between the inner housing 220 and the outer housing 210 is dried by the heat of conduction . In this process, as the steam temperature is lowered by heat exchange, condensed water is generated inside the inner housing 220, and the condensed water is discharged in a direction opposite to the steam supply direction.

As shown in FIG. 4, the method for producing a raw material for sinter using a highly-finely ground sludge containing a valuable metal of the present invention comprises a first sludge having a water content of 16 to 25% and a first sludge having a water content of 30 to 36% The mixed sludge obtained by mixing the second sludge having a particle diameter smaller than that of the first sludge and the third sludge having a water content of 3% or less (excluding 0%) and having a latent heat is dried to have a water content of 10% or less (excluding 0% And is formed into pellets for raw materials for sinter.

A method for producing a raw material for sinter using a high-water-content ultra-fine sludge containing a valuable metal of the present invention comprises the steps of preparing a first sludge having a particle size of 0.83 to 1 mm and a moisture content of 16 to 25%, a step of preparing a sludge having a particle size of 0.2 to 0.38 mm, 36%, preparing a third sludge having a water content of 3% or less (excluding 0%) and a latent heat, mixing the first sludge, the second sludge, and the third sludge to obtain a water content of 15 (20%), the mixed sludge is dried to a water content of less than 10% (excluding 0%), and the dried mixed sludge is less than 3% (excluding 0%) and 8 to 10% And 3 to 9 parts by weight of a binder are mixed with 100 parts by weight of a mixed sludge having a water content of 8 to 10% by a process of supplying water to a third sludge having a moisture content of 3% or less (excluding 0%) in the dried mixed sludge It can be embodied as a process of molding into a pellet having a compressive strength of 30 kgf / cm 2 or more and a particle size of 2 to 10 mm All.

As a binder, cost can be reduced by using low cost cement alone.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

H1: First hopper H2: Second hopper
100: mixer 200: dryer
200a: raw material inlet port 200b: exhaust gas outlet port
200c: carrier air inlet hole 200d: first outlet
200e: second outlet 210: outer housing
220: inner housing 222: disk
224: Feed blade 230: Steam feed pipe
240: Condensate discharge pipe 300: Cyclone
400: Dust collector 500: Transfer line

Claims (20)

A first sludge having a water content of 16 to 25%, a second sludge having a water content of 30 to 36% and a particle size smaller than that of the first sludge, and a third sludge having a water content of 3% Wherein a mixed sludge is dried to have a moisture content of 10% or less (excluding 0%).
The method according to claim 1,
Characterized in that the mixed sludge is dried after the first sludge, the second sludge, and the third sludge are mixed and the water content is adjusted to 15 to 20% and then dried. Drying method.
The method of claim 2,
Wherein the first sludge transports and supplies sludge generated in the steelmaking process, and the second sludge transports and supplies sludge generated in the Finex process. Way.
The method according to claim 1,
The mixed sludge dried at a moisture content of 10% or less (excluding 0%),
Sludge with a moisture content of 3% or less (excluding 0%) and sludge with a moisture content of 8 to 10%
Wherein the sludge having a moisture content of 3% or less (excluding 0%) is supplied to the third sludge.
The method of claim 4,
Preparing a first sludge having a particle size of 0.83 to 1 mm;
Preparing a second sludge having a particle size of 0.2 to 0.38 mm;
Preparing the third sludge;
Mixing the first sludge, the second sludge, and the third sludge to produce a mixed sludge having a moisture content of 15 to 20%;
Drying the mixed sludge at a moisture content of 10% or less (excluding 0%), sorting the dried mixed sludge at a moisture content of 3% or less (excluding 0%) and 8 to 10%; And
And supplying the dried sludge with a moisture content of 3% or less (excluding 0%) to the third sludge.
The method of claim 5,
Wherein the first sludge is 10 to 30 wt.%, And the second sludge is 70 to 90 wt.%.
The method of claim 6,
Wherein the dust contained in the exhaust gas generated in drying the mixed sludge is collected and supplied at the time of producing the mixed sludge.
The method of claim 7,
Wherein the dust is collected after removing the carbon component contained in the exhaust gas generated upon drying the mixed sludge.
The method of claim 6,
Wherein the mixed sludge is indirectly dried by steam. ≪ RTI ID = 0.0 > 15. < / RTI >
The method of claim 9,
Wherein the mixed sludge is dried at a temperature of 150 to 200 DEG C for 10 minutes or more.
A first sludge having a water content of 16 to 25%, a second sludge having a water content of 30 to 36% and a particle size smaller than that of the first sludge, and a third sludge having a water content of 3% Wherein a mixed sludge is dried to have a moisture content of 10% or less (excluding 0%), and is formed into pellets for raw material for sinter.
The method of claim 11,
Preparing a first sludge having a particle size of 0.83 to 1 mm and a water content of 16 to 25%;
Preparing a second sludge having a particle size of 0.2 to 0.38 mm and a water content of 30 to 36%;
Preparing a third sludge having a water content of 3% or less (excluding 0%) and having a latent heat;
Mixing the first sludge, the second sludge, and the third sludge to produce a mixed sludge having a moisture content of 15 to 20%;
Drying the mixed sludge at a moisture content of 10% or less (excluding 0%), sorting the dried mixed sludge at a moisture content of 3% or less (excluding 0%) and 8 to 10%; And
Supplying to the third sludge a moisture content of 3% or less (excluding 0%) in the dried mixed sludge; And
A process for producing a pellet comprising a step of mixing 3 to 9 parts by weight of a binder with 100 parts by weight of a mixed sludge having a water content of 8 to 10% and molding the mixture into pellets having a compression strength of 30 kgf / cm 2 or more and a particle size of 2 to 10 mm A method for producing raw materials for sintering using ultrafine sludge.
The method of claim 12,
Characterized in that the first sludge feeds and feeds the sludge generated in the steelmaking process and the second sludge feeds and feeds the sludge generated in the finishing process, A method for manufacturing raw materials for sintering.
14. The method of claim 13,
Wherein the first sludge is 10 to 30 wt%, the second sludge is 70 to 90 wt%, and the mixed sludge is indirectly dried by steam at a temperature of 150 to 200 DEG C for 10 minutes or more. A method for producing a raw material for sinter using a highly particulate sludge of high water content containing a valuable metal.
A first sludge having a water content of 16 to 25%, a second sludge having a water content of 30 to 36% and a particle size smaller than that of the first sludge, and a third sludge having a water content of 3% A mixer for producing a mixed sludge having a water content of 15 to 20%; And
The mixed sludge was supplied from the mixer and dried to prepare a sludge having a moisture content of 10% or less (excluding 0%). The third sludge having a water content of 3% or less (excluding 0%) was supplied to the mixer. % By weight of the sludge, and discharging the third sludge separately.
16. The method of claim 15,
A cyclone for filtering a carbon component by being supplied with exhaust gas discharged from the dryer, and a dust collector for collecting exhaust gas passing through the cyclone and collecting the highly valuable sludge containing a valuable metal system.
18. The method of claim 16,
Wherein the dust collector and the mixer are connected by a transfer line so that the dust recovered from the dust collector can be supplied to the mixer.
16. The method of claim 15,
The dryer includes:
An outer housing having a raw material inlet through which the mixed sludge supplied from the mixer flows and an exhaust outlet through which the exhaust gas evaporated in the mixed sludge flows out;
An inner housing having an outer circumferential surface spaced apart from an inner circumferential surface of the outer housing by a predetermined distance, a hollow space formed therein, a steam supply pipe connected to one end thereof, And
And a motor coupled to the disk to allow the disk to rotate. ≪ Desc / Clms Page number 24 >
19. The method of claim 18,
An air inlet is formed in the outer housing,
Wherein a disk-shaped disk is protruded in the circumferential direction on the outer circumferential surface of the inner housing, and a transfer blade is coupled to an outer circumferential surface of the disk so that the mixed sludge can be transferred. The particulate sludge drying system.
The method of claim 19,
Wherein a first outlet for discharging a part of the mixed sludge is formed at a lower end of the outer housing and a second outlet for discharging a remaining portion of the mixed sludge is formed at one end of the outer housing, Minute sludge drying system.

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