KR101147876B1 - Process and apparatus for granulating a melt - Google Patents

Process and apparatus for granulating a melt Download PDF

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Publication number
KR101147876B1
KR101147876B1 KR1020077000631A KR20077000631A KR101147876B1 KR 101147876 B1 KR101147876 B1 KR 101147876B1 KR 1020077000631 A KR1020077000631 A KR 1020077000631A KR 20077000631 A KR20077000631 A KR 20077000631A KR 101147876 B1 KR101147876 B1 KR 101147876B1
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KR
South Korea
Prior art keywords
collection tank
dewatering
plate settler
inclined plate
water
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KR1020077000631A
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Korean (ko)
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KR20070031382A (en
Inventor
패트릭 레저
크리스티안 코르티나
Original Assignee
파울 부르쓰 소시에떼 아노님
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Priority claimed from PCT/EP2005/052568 external-priority patent/WO2006005653A1/en
Publication of KR20070031382A publication Critical patent/KR20070031382A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/074—Tower structures for cooling, being confined but not sealed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

In the method of granulating the melt, the melt is quenched with water to produce a mixture of granules and water. In the dehydration apparatus, the mixture is dewatered to recover the solid-load wastewater and feed it to the collection tank. The collection tank is provided with an inclined plate settler, which is always submerged in water. Solid-loaded wastewater is fed to the collection tank such that at least a portion thereof flows from the bottom to the top via a swash plate settler in the collection tank, and at the top outlet of the swash plate settler, a substantially solid water stream flows out of the collection tank.

Figure R1020077000631

Furnace slag melt, granulation, slag sand, inclined plate settler, dewatering unit

Description

METHOD AND APPARATUS FOR GRANING MELTS {PROCESS AND APPARATUS FOR GRANULATING A MELT}

The present invention relates generally to a method and apparatus for granulating a furnace slag melt.

In a granulation plant for furnace slag, the molten slag exiting the slag channel of the furnace is granulated by the spray head and nozzle system and also with water. In this case, a product is formed, which is mostly made of small granules which solidify in a glassy state, called slag sand. In order to produce slag sand suitable for cement production, which is the main application of slag sand, the heat of molten slag must be removed by impact cooling. For this purpose, a relatively large amount of process water is required depending on the amount of slag. In order to dewater the slag sand and recover water in the process circuit, a mixture of water and granules generated by the spray is fed to the dewatering plant. Wastewater removed from the dewatering plant still contains a certain amount of solids. This solid content can settle in the plant components or cause wear of the plant components when further utilizing waste water. For this reason, as disclosed, for example, in the patent document LU 85508 or LU 79466, downstream of the dewatering plant, from the settling tank after the solid has settled using a settling tank or settling basin. Methods of recovering relatively pure process water are known. However, the sedimentation tanks require considerable structural volume and require a relatively complex process that requires regular removal of precipitated solids.

In contrast, patent document DE 102 16 415 proposes a method of using hydrocyclone to at least partially clean wastewater from a dewatering plant. This method allows solids to separate from the water and accelerates stationary dewatering processes, especially with dewatering silos, but from an engineering standpoint it is not only necessary to run complex hydrocyclones, but also to supply feed pumps for hydrocyclones. Requires additional energy consumption to operate. In addition, such hydrocyclones appear to be particularly sensitive to blockage due to slag sand deposits.

Another problem is due to the potential hydraulic properties of the fine granulated slag sand present in the waste water to be cleaned. Slag sand in the wet state has the property of hardening when water is actually removed to form concrete deposits. Therefore, in purifying wastewater from dewatering plants, hardening of slag sand deposits must be absolutely avoided.

Object of the invention

It is an object of the present invention to recover by simple means a water stream which is substantially free of solids and which is less susceptible to blockage due to the solidification of slag sand deposits and which can be suitably used as process water. It is to propose a method of granulating a furnace slag melt. This object is achieved according to the invention by a granulation method of a furnace slag melt according to claim 1. Similarly, an apparatus for carrying out the method is proposed.

General description of the invention

In the process of the invention, the furnace slag melt is quenched with water in a known manner to produce a mixture of granules and water. In the dehydration apparatus, the mixture is dewatered and the solids-loaded wastewater is recovered and fed to a collection tank. According to the invention, the collection tank is provided with an inclined plate settler and is always submerged in water. Solid-loaded wastewater is fed to the collection tank, at least some of which flow from bottom to top through the swash plate settler in the collection tank and as the clarified water, which can also be suitably used as process water. From the capture tank at the top outlet of the settler. This process enables the recovery of substantially solid free water streams by very simple means, in which case there is little sensitivity to blockage due to the solidification of the slag sand deposits. Inclined plate settlers, also referred to as lamellar plate settlers or separators, have been found to be substantially less susceptible to blockage due to the solidification of slag sand deposits, unless the slag sand deposits are completely dry. In the method of the invention, this is ensured by the fact that the swash plate settler is installed in the collection tank and always submerged in water. Even when the process is interrupted and the granulation plant's idle time is relatively long, the slag sand cannot harden because the swash plate settler remains submerged. Because the swash plate settler is installed in the collection tank, no additional space is required for the secondary cleaning plant. Another advantage is that the inclined plate settler is simple and reliable to operate, and because there is no moving member, no special repairs are required and virtually no maintenance costs. In the capture tank, the swash plate settler is also very easy and inexpensive to replace as needed. Another advantage of the method of the present invention is that secondary cleansing in slop plate settler is a purely static process that does not require additional energy.

The collection tank advantageously has a funnel outlet, and sediment sludge is withdrawn from this funnel outlet and fed back to the dewatering device. This maintains a constant solid concentration in the corresponding conveying circulation, and the efficiency of the process can be further improved in practice.

The inclined plate settler is advantageously suspended on a support frame in the collection tank and can be slid onto the support frame. As a result, the swash plate settler is very simply installed and removed in the collection tank.

In a preferred embodiment the inclined plate settler consists of a plurality of modules which are individually suspended on a support frame in the collection tank and placed in an operating position by sliding on the support frame. As a result, the swash plate settler can be simply installed and removed even if the volume of the structure is limited.

The dewatering device advantageously comprises a rotatable dewatering drum provided therein with a shovel. The method of the present invention can be operated continuously by the dehydrating drum. The dewatering drum is advantageously provided directly above the first region of the collecting tank, and the inclined plate settler is provided in the adjacent second region of the collecting tank, which is laterally separated from the first region. By this design, the dehydrating drum is combined with the collection tank and the swash plate settler forms a very compact unit.

However, the dewatering device may likewise comprise one or more dewatering silos or one dewatering screw, the waste water of the dewatering device being fed into the collection tank.

The apparatus for carrying out the process of the invention is in a known manner, an infusion apparatus for injecting water flow into a furnace slag melt to produce a mixture of granules and water, a dewatering apparatus for dehydrating the mixture to recover solid-load wastewater, and A collection tank into which the solid-load wastewater is supplied. According to the invention, the swash plate settler in the collection tank is always submerged in water, at least some of the solid-load wastewater fed to the collection tank flows from bottom to top through the swash plate settler in the collection tank, at the top outlet of the swash plate settler. As purified water that can be suitably used as process water, it is installed to be withdrawn from the collection tank.

Further details and advantages of the invention can be obtained from the following comprehensive description of possible embodiments of the invention based on the accompanying drawings.

1 is a schematic view of a plant for granulating a slag melt.

2 is a schematic diagram of a first step of installing a swash plate settler in a collection tank;

3 is a schematic diagram of a second step of installing a swash plate settler in a collection tank;

4 is a schematic diagram of a third step of installing a swash plate settler in a collection tank;

5 is a view schematically showing that the inclined plate settler installed according to FIGS. 2 to 4 is in an operating state.

In FIG. 1, the granulation plant is indicated generally at 10. The granulation plant 10 has a granulation tower 11 of a type already known per se. In the granulation tower 11, water is injected into the slag melt 14 discharged from the tapping channel 12 to granulate the furnace slag. By this shock-type quenching, the slag melt 14 is granulated to form slag sand. This granulation is carried out in a known manner based on the spray head 16 which injects the bundles 18 of multiple water jets into the melt stream 14. The mixture of water and slag granules obtained is collected in the granulation tank 20 provided in the lower region of the granulation tower 11. The mixture is then transferred from the granulation tank 20 via the distribution channel 22 into the dewatering unit 24. Dewatering unit 24 is preferably, for example, U.S. Patent No. 4,204,855) or (No. 4,289,519, dewatering drum ® Paul Wurth SA INBA products as described in.

As shown in FIG. 1, the slag sand 28 obtained from the dewatering unit 24 is transferred to a suitable reservoir 29 by the conveyor belt 26. On the other hand, solids-loaded water separated from the dewatering unit 24 is collected in a collection tank 30, also called a hot water tank, provided for this purpose from the dewatering drum 24 as waste water. Inflow. Due to the process conditions, despite the filtration function of the dewatering unit 24 formed by the slag sand layer (not shown in more detail) in the lower region of the dewatering drum, the wastewater removed here has a relatively high proportion of solid particulates. It is inevitable, in particular, to still contain slag sand residues.

The collection tank 30 has a structure in which the lower region is a funnel shape, and preferably has an outlet connection 32 in the lower region. Sedimentation sludge collected in the lower region of the capture tank 30 is removed via the outlet connection 32. This settling sludge is conveyed by the pump to the distribution channel 22 upstream of the dewatering unit 24, preferably via the wear resistant pipe 34. In this way the settling sludge is resupplied to the aforementioned filtration function. In the recirculation process indicated by reference numeral 36, the particulate concentration is thus equilibrated.

In addition, it can be seen from FIG. 1 that the inclined plate settler 40 is installed inside the collection tank 30. The inclined plate settler or thin plate separator 40 is a separation device for separately separating phases with different densities of the dispersion system. Inclined plate settler consists essentially of bundles of parallel inclined thin plates or tubes in which the wastewater to be purified generally flows upwards. By gravity, the solid particles settle and slide downward from the inclined plate settler 40 toward the bottom of the thin plate or tube.

The inclined plate settler 40 is mounted in the upper region of the collection tank 30, preferably on a straight outer wall. Inclined plate settler 40 has the function of substantially removing solids from the solid-loaded water collected in collection tank 30 for recovery and water treatment circulation. By purifying the solid-loaded wastewater from the dewatering plant 24, wear, sand deposition and hardening in all plant components to which the purified water is fed, especially from the swash plate settler 40, are reduced. In this case, by installing the swash plate settler 40 inside the collection tank 30 as illustrated, the plant section through which the solid-load wastewater passes is reduced to a minimum, and ideally the dewatering unit 24 and the collection tank ( 30) is collapsed into sections in between. Furthermore, as a result, the length of the recycle circuit 36 is likewise minimized. The use of swash plate settler 40 also allows for efficient treatment of process water with minimal monitoring, maintenance and treatment costs. In addition, the swash plate settler 40 can be integrated into the existing collection tank 30 without requiring additional structural volume. The swash plate settler 40 is preferably used to purify the entire wastewater stream from the dewatering unit 24 remaining after removal of the settling sludge. As an alternative, for example, using a relatively small volume of the collection tank 30, a smaller design of the swash plate settler can be used for the partial flow cleanup process.

Incline plate settler 40 has an upper outlet 42 through which the purified, substantially solid, water-free fraction is removed from collection tank 30. The upper outlet 42 is located at a level lower than the level of water remaining in the collection tank 30 and is obliquely sealed against this level by a corresponding partition wall 44. This causes the solid-load water to flow into the swash plate settler 40 and there is only purified water that cannot return to the collection tank 30 at the upper outlet 42. In this case the inflow according to the arrow 46 takes place automatically and if the filling level of the collecting tank 30 is appropriate, it is due to the difference in the levels. This results in a flow of solid-load wastewater that automatically flows from the bottom to the top through the swash plate settler 40, where the solid is gradually removed by precipitation. Thus, no additional means for operating the swash plate settler 40 is needed. Solids and particulates that settle in the swash plate settler 40 sink only to the lower region of the collection tank 30 indicated by the arrow 48 by gravity action. As explained above, the solid in the settling sludge is recycled to the dewatering unit 24 according to the arrow 36, where it is at least partially filtered. Thus, there is no need to remove and discard the separated solids separately. It should be noted here that the removal rate through the outlet connection 32 and the piping 34 is always lower than the supply rate from the dewatering unit 24. This removal rate is advantageously selected so that the swash plate settler 40 is always optimally loaded.

In order to cool the water heated by the melt waste heat, this water is transferred, for example by a pump, from the storage vessel 50 connected to the upper outlet 42 to the cooling tower and the reservoirs 52 and 52 '. Thus, the water fraction purified by the swash plate settler 40 is particularly suitable for further use as process water in the spray head 16. It should also be pointed out that it is simply ensured that the swash plate settler 40 is always submerged in water simply by keeping the fill level of the collection tank 30 constant. This in particular ensures that there is no hardening that can occur due to the drying of slag sand deposits in the swash plate settler 40. Integration into the circulation according to arrows 36 and 54 as described above ensures automatic circulation of the tank contents with a constant water level in the collection tank 30 without the need for additional means.

FIG. 2 shows a first step of introducing an inclined plate settler 40 'in two parts into a collection tank 30'. The first module 401 of the inclined plate settler 40 'is lowered into the collection tank 30' which is opposed to the side surface by, for example, a crane. The first module 401 comprises an upper frame 411, for example made of steel, to which a thin plate or tube of the inclined plate settler is attached as a package. The roller 421 is mounted on the frame 411, and the module 401 is suspended in the collection tank 30 ′ so as to be slidable on the corresponding support frame 300 having a rail. It is advantageous to install all of the movable elements or the supporting frame 411 above the water level of the collection tank 30 '.

Referring to FIG. 3, it can be seen that the first module 401 of the inclined plate settler 40 ′ can be pushed transversely into the tank 30 ′ via the rails of the roller 421 and the support frame 300. Can be. In the rest position, if the first module 401 is located substantially in the center of the tank 30, the first module can be held in that position by appropriate means.

4 shows a third step of installing the second module 402 of the inclined plate settler 40 ′ corresponding to the first module 401. The second module 402 is introduced at the same height against the first module 401 in a manner similar to the step of FIG. 2. The second module 402 is likewise mounted via a support frame 412 on the roller 422 which allows it to be suspended into the tank 30 '. Finally, the upper outlet channels 431 and 432 of the two modules 401 and 402 are connected to form one or more outlet channels 440.

5 shows the swash plate settler 40 'in ready to operate state. In FIG. 5, a first region 301 is shown in which a dewatering unit (not shown) is installed on top for supplying wastewater into the collection tank 30 ′. The inclined plate settler 40 'composed of the modules 401, 402 is located in the second area 302 separated from the first area 301 by the partition wall 44' initially installed at an angle. According to the structure and the installation method according to FIGS. 2 to 5, the inclined plate settler 40 ′ can be mounted in the collection tank 30 ′ even when space conditions are limited. Further, even if maintenance work is required, for example, rapid installation or removal can be achieved. In this case, the modules 401, 402 are removed in a manner corresponding to the installation.

Such methods and devices may also include dewatering screws, shovel wheels or other dynamic dewatering devices as dewatering devices, as well as stationary dewatering devices such as, for example, filtering beds or dewatering silos.

Claims (17)

Quenching the blast furnace slag melt to produce a mixture of granules and water; Dehydrating the mixture in a dehydration apparatus to recover solid-loaded wastewater and feed it to a collection tank; And Secondary clarification of the solid-load wastewater from the collection tank to recover a substantially solid water stream As a granulation method of the furnace slag melt comprising: Inclined plate settler is always installed in the collection tank submerged, The solid-load wastewater is supplied to a collection tank, at least some of which are flowed from bottom to top through a swash plate settler in the collection tank, so that the purified water can be suitably used as process water. Is discharged from the collection tank at the upper outlet of the inclined plate settler) Granulation method of furnace slag melt. The method of claim 1, And said collection tank has a funnel outlet and sediment sludge is withdrawn from said funnel outlet and fed back to said dewatering device. The method according to claim 1 or 2, And said inclined plate settler in said collection tank is suspended on a support frame and slidable on said support frame. The method according to claim 1 or 2, The inclined plate settler is composed of a plurality of modules, wherein the plurality of modules are individually suspended on a support frame in the collection tank and are moved to an operating position by sliding on the support frame. Granulation method of slag melt. The method according to claim 1 or 2, The dewatering device comprises a rotatable dewatering drum having a shovel therein. The method of claim 5, The dewatering drum is provided directly above the first region of the collection tank, the inclined plate settler is provided in an adjacent second region of the collection tank, and the second region is laterally separated from the first region. A granulation method of a furnace slag melt, characterized in that. The method according to claim 1 or 2, The dewatering device comprises at least one dewatering silo (dewatering silo) characterized in that the granules of the furnace slag melt. The method according to claim 1 or 2, The dewatering device comprises a dewatering screw (dewatering screw) characterized in that the granules of the furnace slag melt. An injection apparatus for injecting a stream of water into the furnace slag melt to produce a mixture of granules and water; A dehydration apparatus for recovering the solid-load wastewater by dehydrating the mixture; And A capture tank to which the solid-load wastewater is supplied As a granulation apparatus of the furnace slag melt comprising: An inclined plate settler is installed in the collection tank, the inclined plate settler is always submerged in water, and at least some of the solid-load wastewater supplied to the collection tank flows from bottom to top through the inclined plate settler in the collection tank, Characterized in that the purified water can be suitably used as process water is withdrawn from the collection tank at the upper outlet of the inclined plate settler Granulation device of furnace slag melt. 10. The method of claim 9, The collection tank has a funnel outlet, and the granulation device includes circulation means for withdrawing settling sludge from the funnel outlet and feeding it back to the dewatering device. Granulation device. 11. The method according to claim 9 or 10, And said inclined plate settler in said collection tank is suspended on a support frame and is slidable on said support frame. 11. The method according to claim 9 or 10, The inclined plate settler is composed of a plurality of modules, wherein the plurality of modules are individually suspended on a support frame in the collection tank and moved to an operating position by sliding on the support frame. Granulation device. 11. The method according to claim 9 or 10, The dewatering device, granulating apparatus of the furnace slag melt characterized in that it comprises a rotatable dewatering drum having a shovel therein. The method of claim 13, The dewatering drum is provided directly above the first region of the collection tank, the inclined plate settler is provided in an adjacent second region of the collection tank, and the second region is laterally separated from the first region. Granulation apparatus of a furnace slag melt characterized by the above-mentioned. 11. The method according to claim 9 or 10, Granulation apparatus of the furnace slag melt, characterized in that the dewatering device comprises one or more dewatering silos. 11. The method according to claim 9 or 10, Granulation apparatus of the furnace slag melt, characterized in that the dewatering device comprises a dewatering screw. delete
KR1020077000631A 2004-07-14 2005-06-03 Process and apparatus for granulating a melt KR101147876B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU91088 2004-07-14
PCT/EP2005/052568 WO2006005653A1 (en) 2004-07-14 2005-06-03 Process and apparatus for granulating a melt

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KR101147876B1 true KR101147876B1 (en) 2012-07-02

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LU92235B1 (en) * 2013-07-01 2015-01-02 Wurth Paul Sa Steam condensation tower for a granulation installation
KR101717196B1 (en) 2016-11-25 2017-03-17 성일하이텍(주) Apparatus for manufacturing granule and manufacturing method thereby
KR102082770B1 (en) 2019-10-25 2020-02-28 성일하이메탈(주) Apparatus and method for producing molten metal granules using high pressure water spray

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003520290A (en) 1998-06-26 2003-07-02 ポル ヴルス エス アー Equipment for wet granulation of liquid slag

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003520290A (en) 1998-06-26 2003-07-02 ポル ヴルス エス アー Equipment for wet granulation of liquid slag

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