CA2290500C - Apparatus for and process of water granulating matte or slag - Google Patents
Apparatus for and process of water granulating matte or slag Download PDFInfo
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- CA2290500C CA2290500C CA 2290500 CA2290500A CA2290500C CA 2290500 C CA2290500 C CA 2290500C CA 2290500 CA2290500 CA 2290500 CA 2290500 A CA2290500 A CA 2290500A CA 2290500 C CA2290500 C CA 2290500C
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
- C03B19/1045—Forming solid beads by bringing hot glass in contact with a liquid, e.g. shattering
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling 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
- C21B2400/02—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
- C21B2400/05—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Furnace Details (AREA)
- Glanulating (AREA)
- Manufacture Of Iron (AREA)
- Processing Of Solid Wastes (AREA)
- Disintegrating Or Milling (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Molten matte or slag is water granulated by feeding molten matte or slag through a launder (10a, 10b) to a granulator tank (11a, 11b). Tank (11a, 11b) comprises sloping walls and is equipped with adjustabl e overflow weirs (22b) and one or more spray nozzles (19a, 19b). Nozzles (19a, 19b) are positioned so water that they emit impacts substantially all of the molten matte or slag that is fed to granulator tank (11a, 11b). Granulation tank (11a, 11b) is optionally coated with a polymeric material to reduce the potential for phreatic explosions. The granulator is optionally equipped with a gas offtake (16b) which can be connected directly to quench tower (14b) which in turn can be connected to an induced ventilation system (15). The granulator is preferably fitted with an explosion relief opening (27b) consisting of durable channels (28b) with explosion relief opening (27b) preferably covere d with a polymeric material (29b).
Description
APPARATUS FOR AND PROCESS OF WATER
GRANULATING MATTE OR SLAG
BACKGROUND OF THE INVENTION
This invention relates to water granulation. In one aspect, this invention relates to an apparatus useful for the water granulation of molten matte or slag while in another aspect, this invention relates to a method of water granulating matte or slag.
In yet another aspect this invention relates to an apparatus and method of water granulating matte or slag in an environmentally safe manner and with minimal, if any, phreatic explosions.
In the various pyrometallurgical processes, particularly nonferrous processes, 1 S molten matte and slag are generated as intermediate product and by-product, respectively.
Efficient handling of these materials favors their reduction to a flowable, particulate state.
Many methods are known for making this reduction, and these include water granulation, air granulation, grinding, rotary atomization (as described in USP 5,409,521 which is incorporated herein by reference) and the like. For reasons of convenience, safety and cost, water granulation is often a preferred method of size reducing matte and slag. One representative water granulation method is described in USP 5,468,279 which is incorporated herein by reference.
While all of the above techniques are effective to one degree or another, all are 2S subject to improvement, particularly with respect to environmental and safety considerations. With respect to water granulation in particular, improvements in gas emission capture and reduction in phreatic explosions are the targets of a constant quest.
SUMMARY OF THE INVENTION
According to this invention, molten matte or slag is water granulated by feeding molten matte or slag through a launder to a granulator tank. The tank comprises sloping walls, and it is equipped with one or more baffles which divides it into an active granulation zone and a quiescent settling zone. The tank is also equipped with adjustable overflow weirs and a multiplicity of spray nozzles. These nozzles are positioned such that the water that they emit impacts on all or substantially all of the molten matte or slag that is fed to the granulator tank. The granulation tank is optionally coated with a polymeric material to reduce the potential for phreatic explosions. The granulator is also optionally equipped with a gas offtake which can be connected directly to a quench tower which in turn can be connected to an induced ventilation system.
The granulator tank is also equipped with a bucket elevator for removing granulated material. Water overflow from the granulator is transferred to a thickener/clarifier to recover solids. The recovered granulation water from the thickener/clarifier is cooled and recycled, and the pH of this water is controlled to maximize the efficiency of removing pollutants from the granulator ventilation gas.
An aspect of the invention provides an apparatus for granulating molten material, the apparatus comprising:
A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) means for diverting material spills away from the granulation zone, and (iv) means to impede the discharge of solid material from the granulator tank to the means for conveying;
GRANULATING MATTE OR SLAG
BACKGROUND OF THE INVENTION
This invention relates to water granulation. In one aspect, this invention relates to an apparatus useful for the water granulation of molten matte or slag while in another aspect, this invention relates to a method of water granulating matte or slag.
In yet another aspect this invention relates to an apparatus and method of water granulating matte or slag in an environmentally safe manner and with minimal, if any, phreatic explosions.
In the various pyrometallurgical processes, particularly nonferrous processes, 1 S molten matte and slag are generated as intermediate product and by-product, respectively.
Efficient handling of these materials favors their reduction to a flowable, particulate state.
Many methods are known for making this reduction, and these include water granulation, air granulation, grinding, rotary atomization (as described in USP 5,409,521 which is incorporated herein by reference) and the like. For reasons of convenience, safety and cost, water granulation is often a preferred method of size reducing matte and slag. One representative water granulation method is described in USP 5,468,279 which is incorporated herein by reference.
While all of the above techniques are effective to one degree or another, all are 2S subject to improvement, particularly with respect to environmental and safety considerations. With respect to water granulation in particular, improvements in gas emission capture and reduction in phreatic explosions are the targets of a constant quest.
SUMMARY OF THE INVENTION
According to this invention, molten matte or slag is water granulated by feeding molten matte or slag through a launder to a granulator tank. The tank comprises sloping walls, and it is equipped with one or more baffles which divides it into an active granulation zone and a quiescent settling zone. The tank is also equipped with adjustable overflow weirs and a multiplicity of spray nozzles. These nozzles are positioned such that the water that they emit impacts on all or substantially all of the molten matte or slag that is fed to the granulator tank. The granulation tank is optionally coated with a polymeric material to reduce the potential for phreatic explosions. The granulator is also optionally equipped with a gas offtake which can be connected directly to a quench tower which in turn can be connected to an induced ventilation system.
The granulator tank is also equipped with a bucket elevator for removing granulated material. Water overflow from the granulator is transferred to a thickener/clarifier to recover solids. The recovered granulation water from the thickener/clarifier is cooled and recycled, and the pH of this water is controlled to maximize the efficiency of removing pollutants from the granulator ventilation gas.
An aspect of the invention provides an apparatus for granulating molten material, the apparatus comprising:
A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) means for diverting material spills away from the granulation zone, and (iv) means to impede the discharge of solid material from the granulator tank to the means for conveying;
B. means for projecting water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank; C. means for removing the granulated material from the settling zone of the granulator tank; and D. means for capturing gas emissions from the granulator tank.
Another aspect of the invention provides an apparatus for granulating molten material, the apparatus comprising: A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, the weirs are adjustably positioned in the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) a polymeric coating, (iv) means for diverting material spills away from the granulation zone, and (v) means to impede a discharge of solid material from the granulator tank to the means for conveying; B. means for projecting pH neutral or slightly basic water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. means for removing the granulated material from the settling zone of the granulator tank comprising a bucket 2a elevator, the bucket elevator being adjustably positioned in relation to the bottom of the granulator tank; D. means for capturing gas emissions from the granulator tank; and E.
means for recycling the water from the granulator tank back to the means for projecting.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a schematic flow diagram of one embodiment of a matte granulation process from matte launders to two granulators to a granulated matte conveyor belt.
FIGURE 2 is a schematic depiction of the two granulators of FIGURE 1.
FIGURE 3 is a schematic depiction of the bucket excavator of FIGURES 1 and 2:
DESCRIPTION OF THE PREFERRED EMBODIMENT
The water granulation apparatus of this invention is capable of granulating either molten matte or slag or a combination of both. Typical matte and slag compositions include those generated in copper smelting processes as those described in USP 5,449,395; 4,416,690; 5,217,427 and 5,007,959. Representative mattes and stags generated from a nickel smelting process are described in USP 5,215,571.
Like numerals are employed to designate like parts throughout the drawings. Various items of equipment, such as valves, fittings, heaters and the like, are omitted so 2b as to simplify the description of the invention but those skilled in the art will recognize that such conventional equipment can be, and is, employed as desired.
One typical embodiment of the process of this invention is depicted in FIGURE
1.
Molten matte (e.g. copper or nickel) or slag. in this case matte. is conveyed by launders l0a and l Ob from one or more smelters or other pyrometallurgical furnaces (not shown) to granulation tanks 1 I a and 11 b. The molten matte is contacted with water within these tanks, and it is converted to granulated matte which collects at the bottom of the tanks.
Bucket excavators 12a and 12b remove the granulated matte on a continuous or batch basis from the bottom of the granulation tanks to conveyor 13 or similar transport equipment which transports the granulated matte to a storage or shipping facility or to another station for further processing (none of which are shown in the Figures).
FIGURE 2 depicts one embodiment of the granulator of this invention. Typically the granulator (here described in terms of granulator 11 b) includes an enclosed and ventilated tower 14b connected to a ventilation duct 15. Tower 14b is joined to steam hood 16b which covers granulation zone 17b. The granulation zone is equipped with an intermediate ladle (e.g. ladle 18a shown in the cutaway section of granulation zone 17a) positioned relative to one or more water nozzles (e.g. 19a and 19b) such that molten matte discharged from the intermediate ladle (which was received from launder l0a or l Ob, respectively) comes into immediate and substantially complete contact with water discharged from the nozzles.
The contact of molten matte with water generates steam which is captured by the steam hood and vented through the tower to the ventilation duct. Typically and preferably, the intermediate ladle is located above the nozzle, and the nozzle is operated in such a manner that it ejects a spray or cascade of water. The molten matte discharged from the ladle thus passes or falls through the water spray or cascade.
Upon contact with water, the molten matte is granulated and collected at the bottom of the granulation tank, i.e. in settling zone 20b. Granulation zone 17b is separated from settling zone 20b by baffle 21 b which is typically one or more concrete or steel structures extending from the inner walls of the granulation tank.
Settling zone 20b is also equipped with granulation water overflow weir 22b which will capture and divert from the settling zone the granulation water. The granulated matte is eventually removed from the settling zone by excavation buckets 23b which are depicted in greaser detail in FIGURE 3.
The granulation tank is also equipped with provisions (e.g. emergency launder 24b and emergency pot 25b) to control and direct any molten material spills that may occur on occasion away from the granulation area.
The granulator tank consists of reinforced concrete or other suitable construction material, e.g. steel, and comprises sloping walls (as depicted in FIGURE 3) to direct the granulated material to the bucket elevator. The overflow weirs are located along the side of the tank to allow controlled withdrawal of water, and preferably these weirs are 1 ~ adjustable. The weirs are isolated from the free-board in the granulator and the turbulent water by metal partitions 26a and b which extend into the water as shown in FIGURE 2.
In one embodiment, water enters the granulation pit or tank through a plate (not shown), typically made of stainless steel, which is fitted with a multiplicity of spray nozzles. The number, diameter (size) and positioning of the nozzles can vary to convenience, the exact size, number and positioning of the nozzles a function of the molten material, the parameters of the granulating operation, the desired final particle size of the granulated product, and similar factors. The combination of all these factors ultimately determines the number and size of phreatic explosions.
Optionally, the granulation pit is coated with a polymeric material, e.g. a coal tar epoxy, to reduce the potential for molten material explosions. While not wanting to be bound by theory, organic materials are believed to prevent metal-water explosions by interfering with the onset of nucleate boiling at the interface between the molten material and the granulation tank.
Another aspect of the invention provides an apparatus for granulating molten material, the apparatus comprising: A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, the weirs are adjustably positioned in the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) a polymeric coating, (iv) means for diverting material spills away from the granulation zone, and (v) means to impede a discharge of solid material from the granulator tank to the means for conveying; B. means for projecting pH neutral or slightly basic water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. means for removing the granulated material from the settling zone of the granulator tank comprising a bucket 2a elevator, the bucket elevator being adjustably positioned in relation to the bottom of the granulator tank; D. means for capturing gas emissions from the granulator tank; and E.
means for recycling the water from the granulator tank back to the means for projecting.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a schematic flow diagram of one embodiment of a matte granulation process from matte launders to two granulators to a granulated matte conveyor belt.
FIGURE 2 is a schematic depiction of the two granulators of FIGURE 1.
FIGURE 3 is a schematic depiction of the bucket excavator of FIGURES 1 and 2:
DESCRIPTION OF THE PREFERRED EMBODIMENT
The water granulation apparatus of this invention is capable of granulating either molten matte or slag or a combination of both. Typical matte and slag compositions include those generated in copper smelting processes as those described in USP 5,449,395; 4,416,690; 5,217,427 and 5,007,959. Representative mattes and stags generated from a nickel smelting process are described in USP 5,215,571.
Like numerals are employed to designate like parts throughout the drawings. Various items of equipment, such as valves, fittings, heaters and the like, are omitted so 2b as to simplify the description of the invention but those skilled in the art will recognize that such conventional equipment can be, and is, employed as desired.
One typical embodiment of the process of this invention is depicted in FIGURE
1.
Molten matte (e.g. copper or nickel) or slag. in this case matte. is conveyed by launders l0a and l Ob from one or more smelters or other pyrometallurgical furnaces (not shown) to granulation tanks 1 I a and 11 b. The molten matte is contacted with water within these tanks, and it is converted to granulated matte which collects at the bottom of the tanks.
Bucket excavators 12a and 12b remove the granulated matte on a continuous or batch basis from the bottom of the granulation tanks to conveyor 13 or similar transport equipment which transports the granulated matte to a storage or shipping facility or to another station for further processing (none of which are shown in the Figures).
FIGURE 2 depicts one embodiment of the granulator of this invention. Typically the granulator (here described in terms of granulator 11 b) includes an enclosed and ventilated tower 14b connected to a ventilation duct 15. Tower 14b is joined to steam hood 16b which covers granulation zone 17b. The granulation zone is equipped with an intermediate ladle (e.g. ladle 18a shown in the cutaway section of granulation zone 17a) positioned relative to one or more water nozzles (e.g. 19a and 19b) such that molten matte discharged from the intermediate ladle (which was received from launder l0a or l Ob, respectively) comes into immediate and substantially complete contact with water discharged from the nozzles.
The contact of molten matte with water generates steam which is captured by the steam hood and vented through the tower to the ventilation duct. Typically and preferably, the intermediate ladle is located above the nozzle, and the nozzle is operated in such a manner that it ejects a spray or cascade of water. The molten matte discharged from the ladle thus passes or falls through the water spray or cascade.
Upon contact with water, the molten matte is granulated and collected at the bottom of the granulation tank, i.e. in settling zone 20b. Granulation zone 17b is separated from settling zone 20b by baffle 21 b which is typically one or more concrete or steel structures extending from the inner walls of the granulation tank.
Settling zone 20b is also equipped with granulation water overflow weir 22b which will capture and divert from the settling zone the granulation water. The granulated matte is eventually removed from the settling zone by excavation buckets 23b which are depicted in greaser detail in FIGURE 3.
The granulation tank is also equipped with provisions (e.g. emergency launder 24b and emergency pot 25b) to control and direct any molten material spills that may occur on occasion away from the granulation area.
The granulator tank consists of reinforced concrete or other suitable construction material, e.g. steel, and comprises sloping walls (as depicted in FIGURE 3) to direct the granulated material to the bucket elevator. The overflow weirs are located along the side of the tank to allow controlled withdrawal of water, and preferably these weirs are 1 ~ adjustable. The weirs are isolated from the free-board in the granulator and the turbulent water by metal partitions 26a and b which extend into the water as shown in FIGURE 2.
In one embodiment, water enters the granulation pit or tank through a plate (not shown), typically made of stainless steel, which is fitted with a multiplicity of spray nozzles. The number, diameter (size) and positioning of the nozzles can vary to convenience, the exact size, number and positioning of the nozzles a function of the molten material, the parameters of the granulating operation, the desired final particle size of the granulated product, and similar factors. The combination of all these factors ultimately determines the number and size of phreatic explosions.
Optionally, the granulation pit is coated with a polymeric material, e.g. a coal tar epoxy, to reduce the potential for molten material explosions. While not wanting to be bound by theory, organic materials are believed to prevent metal-water explosions by interfering with the onset of nucleate boiling at the interface between the molten material and the granulation tank.
The water flow rate to the granulator tank will vary with the design of the tank, the nature and amount of molten material, water temperature and other variables, but typically varies between about 30 and about 10 tons of water per ton of material, preferably between about 2~ and 1 ~ tons water per ton of material. Depending upon the various design and operating variables of the water granulation system, typical systems can routinely process 60 tons per hour (tph) of molten material, e.g. copper matte, often in excess of 85 tph, and some system designs and operations can process in excess of 200, even 300, tph molten material without damaging explosions.
Water pressure is typically between about 6~ and 120 psig, preferably between about 85 and 105 psig, to promote explosion-free granulation. Some small "bangs" are typical and useful to assure the operators that the system is operating normally. The water temperature is typically in excess or 90 F, preferably between about 120 to 140 F.
Preferably, the granulators are fitted with an explosion relief opening 27b consisting of durable, e.g. stainless steel, channels 28b set at a spacing to reduce the possibility of solid material being expelled from the granulation area closest to the molten material inlet launder. Here too, preferably the explosion relief opening is covered with a polymeric material 29b, e.g. a polymer coated fabric, and retained by elastic cords to prevent release of steam during normal operation but allowing relief of pressurized gases in the event of an explosion (thus preventing structural damage to the granulator tank and associated equipment).
The granulator is preferably equipped with a gas offtake which connects directly to quench tower (scrubber) 14b and then to an induced ventilation system (e.g.
ventilation duct 15). The quench tower can be operated with a side-stream of the main granulation water to effect the scrubbing of pollutants such as sulfur dioxide or particulate matter.
The quench tower effluent can flow directly into the granulation tank.
Alternatively the granulator can be ventilated through a remotely located scrubber (not shown).
In another alternative, the granulator can be tightly sealed to prevent any gas escape with the exception of gases into the ventilated launder enclosure.
Water pressure is typically between about 6~ and 120 psig, preferably between about 85 and 105 psig, to promote explosion-free granulation. Some small "bangs" are typical and useful to assure the operators that the system is operating normally. The water temperature is typically in excess or 90 F, preferably between about 120 to 140 F.
Preferably, the granulators are fitted with an explosion relief opening 27b consisting of durable, e.g. stainless steel, channels 28b set at a spacing to reduce the possibility of solid material being expelled from the granulation area closest to the molten material inlet launder. Here too, preferably the explosion relief opening is covered with a polymeric material 29b, e.g. a polymer coated fabric, and retained by elastic cords to prevent release of steam during normal operation but allowing relief of pressurized gases in the event of an explosion (thus preventing structural damage to the granulator tank and associated equipment).
The granulator is preferably equipped with a gas offtake which connects directly to quench tower (scrubber) 14b and then to an induced ventilation system (e.g.
ventilation duct 15). The quench tower can be operated with a side-stream of the main granulation water to effect the scrubbing of pollutants such as sulfur dioxide or particulate matter.
The quench tower effluent can flow directly into the granulation tank.
Alternatively the granulator can be ventilated through a remotely located scrubber (not shown).
In another alternative, the granulator can be tightly sealed to prevent any gas escape with the exception of gases into the ventilated launder enclosure.
The bucket elevator is used to remove material from the granulation tank, and it is equipped with rollers, guides and a lifting hoist so it can be partially removed from the granulation tank for servicing or to effect a controlled removal of material from the tank.
This latter procedure allows the tank to be "mined" should it be overfilled with granulated material.
The water overflow from the granulator is directed to a thickener/clarifier (not shown) to recover any solids that are entrained in the granulation water. The underflow from the thickener can optionally be fed into slotted granulation excavator buckets to effect filtration and recovery of the material. Alternatively, the underflow can be directed to a filtration apparatus.
The granulation water pH is controlled by addition of a basic compound, such as NaOH, to maintain the pH at about neutral to slightly basic. In one embodiment, the 1 S controlled pH water is used to scrub pollutants from the granulator ventilation gas.
The granulation water can be cooled in a conventional cooling tower, and then recycled to the granulation system. Preferably, a backup water supply system is provided to assure water flow to the granulation heads even in the event of an electrical power failure that shuts down the main granulation pumps.
Although this invention has been described in considerable detail by reference to the drawings and the various embodiments detailed above, this description is for the purpose of illustration and is not to be construed as a limitation upon the invention as described in the appended claims.
This latter procedure allows the tank to be "mined" should it be overfilled with granulated material.
The water overflow from the granulator is directed to a thickener/clarifier (not shown) to recover any solids that are entrained in the granulation water. The underflow from the thickener can optionally be fed into slotted granulation excavator buckets to effect filtration and recovery of the material. Alternatively, the underflow can be directed to a filtration apparatus.
The granulation water pH is controlled by addition of a basic compound, such as NaOH, to maintain the pH at about neutral to slightly basic. In one embodiment, the 1 S controlled pH water is used to scrub pollutants from the granulator ventilation gas.
The granulation water can be cooled in a conventional cooling tower, and then recycled to the granulation system. Preferably, a backup water supply system is provided to assure water flow to the granulation heads even in the event of an electrical power failure that shuts down the main granulation pumps.
Although this invention has been described in considerable detail by reference to the drawings and the various embodiments detailed above, this description is for the purpose of illustration and is not to be construed as a limitation upon the invention as described in the appended claims.
Claims (9)
1. An apparatus for granulating molten material, the apparatus comprising:
A. Means for conveying a molten material from a source of molten material to n sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) means for diverting material spills away from the granulation zone, and (iv) means to impede the discharge of solid material from the granulator tank to the means for conveying:
B. Means for projecting water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. Means for removing the granulated material from the settling zone of the granulator tank: and D. Means for capturing gas emissions from the granulator tank.
A. Means for conveying a molten material from a source of molten material to n sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) means for diverting material spills away from the granulation zone, and (iv) means to impede the discharge of solid material from the granulator tank to the means for conveying:
B. Means for projecting water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. Means for removing the granulated material from the settling zone of the granulator tank: and D. Means for capturing gas emissions from the granulator tank.
2. A method of granulating a molten material, the method comprising the steps of:
A. Feeding a molten material into a granulation zone of a granulator tank;
B. Contacting the molten material with sufficient water, the water pH
controlled to neutral or slightly basic, and in such a manner in the granulation zone such that the molten material is converted into granulated material with only phreatic explosions that are not damaging to the granulator tank:
C. Collecting the granulated material in a settling zone of the granulator tank;
D. Collecting gas emissions from the granulator tank, and converting such emissions to a form suitable for discharge to the environment:
E. recovering the water remaining from Step (B) from the granulated material, converting the recovered water to a form suitable for use in Step (B), and recycling the recovered water to Step (B);
F. removing the granulated material from the settling zone of the granulator tank with an adjustably positioned removal means; and G. diverting spills of the molten material away from the granulation zone of the granulator tank.
A. Feeding a molten material into a granulation zone of a granulator tank;
B. Contacting the molten material with sufficient water, the water pH
controlled to neutral or slightly basic, and in such a manner in the granulation zone such that the molten material is converted into granulated material with only phreatic explosions that are not damaging to the granulator tank:
C. Collecting the granulated material in a settling zone of the granulator tank;
D. Collecting gas emissions from the granulator tank, and converting such emissions to a form suitable for discharge to the environment:
E. recovering the water remaining from Step (B) from the granulated material, converting the recovered water to a form suitable for use in Step (B), and recycling the recovered water to Step (B);
F. removing the granulated material from the settling zone of the granulator tank with an adjustably positioned removal means; and G. diverting spills of the molten material away from the granulation zone of the granulator tank.
3. The apparatus of Claim 1 further comprising means for recycling the projected water from the granulating tank.
4. The apparatus of Claim 1 further comprising means for controlling the pH of the projected water in a range of neutral to slightly basic.
5. The apparatus of Claim 1 wherein the means for removing the granulated material comprises a bucket elevator, the bucket elevator being adjustably positioned in relation to the bottom of the granulator tank.
6. The apparatus of Claim 1 wherein the granulator tank is coated with a polymeric material.
7. The apparatus of Claim 1 wherein the weirs are adjustably positioned along an inner side of the granulator tank.
8. The apparatus of Claim 3 wherein the recycled water is passed through a thickener/clarifier to remove suspended material.
9. An apparatus for granulating molten material, the apparatus comprising:
A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, the weirs are adjustably positioned in the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) a polymeric coating, (iv) means for diverting material spills away from the granulation zone, and (v) means to impede a discharge of solid material from the granulator tank to the means for conveying;
B. means for projecting pH neutral or slightly basic water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. means for removing the granulated material from the settling zone of the granulator tank comprising a bucket elevator, the bucket elevator being adjustably positioned in relation to the bottom of the granulator tank;
D. means for capturing gas emissions from the granulator tank; and E. means for recycling the water from the granulator tank back to the means for projecting.
A. means for conveying a molten material from a source of molten material to a sloping wall granulator tank having a freeboard area, the granulator tank equipped with (i) water overflow weirs, the weirs isolated from the freeboard area by at least one partition that extends into the granulator tank, the weirs are adjustably positioned in the granulator tank, (ii) a baffle to divide the granulator tank into a settling zone and a granulation zone, (iii) a polymeric coating, (iv) means for diverting material spills away from the granulation zone, and (v) means to impede a discharge of solid material from the granulator tank to the means for conveying;
B. means for projecting pH neutral or slightly basic water onto the molten material as the molten material is discharged from the means for conveying into the granulation zone of the granulator tank such that the molten material is converted into a granulated material and then collects in the settling zone of the granulator tank;
C. means for removing the granulated material from the settling zone of the granulator tank comprising a bucket elevator, the bucket elevator being adjustably positioned in relation to the bottom of the granulator tank;
D. means for capturing gas emissions from the granulator tank; and E. means for recycling the water from the granulator tank back to the means for projecting.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/866,484 US6000242A (en) | 1996-05-31 | 1997-05-30 | Apparatus for and process of water granulating matte or slag |
| US08/866,484 | 1997-05-30 | ||
| PCT/US1998/010882 WO1998054103A1 (en) | 1997-05-30 | 1998-05-28 | Apparatus for and process of water granulating matte or slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2290500A1 CA2290500A1 (en) | 1998-12-03 |
| CA2290500C true CA2290500C (en) | 2007-03-20 |
Family
ID=25347708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2290500 Expired - Fee Related CA2290500C (en) | 1997-05-30 | 1998-05-28 | Apparatus for and process of water granulating matte or slag |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0988256A4 (en) |
| JP (1) | JP2002501471A (en) |
| KR (1) | KR100507883B1 (en) |
| CN (1) | CN1114565C (en) |
| AU (1) | AU730145B2 (en) |
| BG (1) | BG64257B1 (en) |
| BR (1) | BR9809195A (en) |
| CA (1) | CA2290500C (en) |
| PL (1) | PL186835B1 (en) |
| RU (1) | RU2203864C2 (en) |
| TR (1) | TR199902919T2 (en) |
| WO (1) | WO1998054103A1 (en) |
| YU (1) | YU62099A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE291642T1 (en) * | 2002-11-25 | 2005-04-15 | Wurth Paul Sa | SPRAY HEAD FOR A GRANULATING SYSTEM |
| US7857887B2 (en) * | 2008-12-20 | 2010-12-28 | Xiangguang Copper Co., Ltd. | Environment-friendly non-noise matte granulation technique |
| AU2008261182B2 (en) * | 2008-12-22 | 2013-05-23 | Xiangguang Copper Co., Ltd | Environment-friendly non-noise matte granulation technique |
| FI124883B (en) | 2012-12-20 | 2015-03-13 | Outotec Oyj | Method and apparatus for acid granulation of metallic rock |
| KR101556596B1 (en) | 2013-05-03 | 2015-10-01 | 이엔비나노텍(주) | Direct cooling manufacturing apparatus for molten slag and manufacturing method thereof |
| CN110004256A (en) * | 2019-04-26 | 2019-07-12 | 马鞍山市佳腾节能环保科技有限公司 | A method of blast furnace granulated slag is automatically grabbed using driving |
| CN110090488B (en) * | 2019-05-31 | 2021-04-06 | 安徽中巨机电设备有限公司 | Slag-water separation device |
| CN113584315B (en) * | 2021-07-31 | 2023-03-24 | 山东齐力环保科技有限公司 | Recovery unit is smelted to useless catalyst |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2159433A (en) * | 1938-01-05 | 1939-05-23 | John F Ervin | Method of disintegrating metal into shotting |
| US2286078A (en) * | 1939-01-31 | 1942-06-09 | Holland & Hannen And Cubltts L | Foaming or granulating molten material |
| US2384892A (en) * | 1942-05-28 | 1945-09-18 | F W Berk & Company | Method for the comminution of molten metals |
| AU287514B2 (en) * | 1964-07-22 | 1966-04-21 | The Eagle-Picher Company | Method and apparatus for manufacturing porcelain enamel frit |
| LU79466A1 (en) * | 1978-04-18 | 1979-05-25 | Sidmar Nv | PROCESS AND PLANT FOR TREATMENT AND HANDLING OF METALLURGIC DAIRY |
| US4230477A (en) * | 1979-01-02 | 1980-10-28 | Sharonov Mikhail A | Apparatus for granulating molten slag |
| FI814233L (en) * | 1981-12-31 | 1983-07-01 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER FRAMSTAELLNING AV GLASSKAERVMASSA |
| FR2542760B1 (en) * | 1983-03-17 | 1987-09-11 | Gagneraud Francis | IMPROVED PLANT FOR THE CONTINUOUS PROCESSING OF FUSED MATERIALS TO OBTAIN BOULETTE PRODUCTS |
| SU1426956A1 (en) * | 1984-12-28 | 1988-09-30 | Государственный Союзный Институт По Проектированию Металлургических Заводов "Гипромез" | Installation for granulating metallurgical melt |
| US4995894A (en) * | 1989-05-01 | 1991-02-26 | National Slag Limited | Enclosures for slag pelletization apparatus and method of operation |
| US5468279A (en) * | 1994-09-19 | 1995-11-21 | Mitsubishi Materials Corporation | Method for water-granulating calcium ferrite slag |
-
1998
- 1998-05-28 YU YU62099A patent/YU62099A/en unknown
- 1998-05-28 AU AU76033/98A patent/AU730145B2/en not_active Ceased
- 1998-05-28 JP JP50090899A patent/JP2002501471A/en active Pending
- 1998-05-28 PL PL98337082A patent/PL186835B1/en not_active IP Right Cessation
- 1998-05-28 WO PCT/US1998/010882 patent/WO1998054103A1/en active IP Right Grant
- 1998-05-28 BR BR9809195A patent/BR9809195A/en not_active IP Right Cessation
- 1998-05-28 CN CN98805669A patent/CN1114565C/en not_active Expired - Fee Related
- 1998-05-28 CA CA 2290500 patent/CA2290500C/en not_active Expired - Fee Related
- 1998-05-28 EP EP98923836A patent/EP0988256A4/en not_active Withdrawn
- 1998-05-28 TR TR1999/02919T patent/TR199902919T2/en unknown
- 1998-05-28 KR KR10-1999-7011014A patent/KR100507883B1/en not_active IP Right Cessation
- 1998-05-28 RU RU99128049A patent/RU2203864C2/en active
-
1999
- 1999-11-30 BG BG103935A patent/BG64257B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL337082A1 (en) | 2000-07-31 |
| BG103935A (en) | 2000-07-31 |
| EP0988256A1 (en) | 2000-03-29 |
| YU62099A (en) | 2000-12-28 |
| WO1998054103A1 (en) | 1998-12-03 |
| CA2290500A1 (en) | 1998-12-03 |
| CN1259108A (en) | 2000-07-05 |
| BG64257B1 (en) | 2004-07-30 |
| RU2203864C2 (en) | 2003-05-10 |
| KR100507883B1 (en) | 2005-08-17 |
| BR9809195A (en) | 2000-08-01 |
| KR20010013038A (en) | 2001-02-26 |
| AU730145B2 (en) | 2001-03-01 |
| JP2002501471A (en) | 2002-01-15 |
| EP0988256A4 (en) | 2000-07-19 |
| TR199902919T2 (en) | 2000-02-21 |
| AU7603398A (en) | 1998-12-30 |
| PL186835B1 (en) | 2004-03-31 |
| CN1114565C (en) | 2003-07-16 |
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| EEER | Examination request | ||
| MKLA | Lapsed |