WO2003106012A1 - Method and apparatus for granulating molten metal - Google Patents

Method and apparatus for granulating molten metal Download PDF

Info

Publication number
WO2003106012A1
WO2003106012A1 PCT/NO2003/000192 NO0300192W WO03106012A1 WO 2003106012 A1 WO2003106012 A1 WO 2003106012A1 NO 0300192 W NO0300192 W NO 0300192W WO 03106012 A1 WO03106012 A1 WO 03106012A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal
stream
droplets
flume
gas stream
Prior art date
Application number
PCT/NO2003/000192
Other languages
French (fr)
Inventor
Karl Forwald
Original Assignee
Elkem Asa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elkem Asa filed Critical Elkem Asa
Priority to AU2003277245A priority Critical patent/AU2003277245A1/en
Publication of WO2003106012A1 publication Critical patent/WO2003106012A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/086—Cooling after atomisation

Definitions

  • the present invention relates to a method and an apparatus for granulating molten metals and alloys, particularly silicon and alloys having a high content of silicon such as ferrosilicon.
  • ferroalloy melts such as FeCr, FeSi, SiMn and others
  • a large part of granules or particles having a particle size less then 5 mm are formed.
  • ferrosilicon granules the part of particles having a particle size of less than 5 mm in typically in the range of 22 - 35 % of granulated melt and the mean particle size is about 7 mm.
  • particles having a size of below 5 mm are not wanted. Further, particles having a particle size below 1 mm are particularly harmful as such particles will be suspended in the bath of cooling liquid and necessitate a continuous cleaning of the cooling liquid.
  • the method according to US patent No. 3,888,956 has further shown to be exposed to explosions particularly when granulating silicon and alloys having a high content of silicon and a low content of easily oxidising alloying elements such as Ca and AI.
  • the reason that explosions occur is that all particles have not got a shell of solidified alloy before they hit the cooling liquid bath and that the film of water vapour that forms around each particle in the cooling bath may collapse and result in vapour explosions. Larger and minor explosions therefor occur by use of the method according to the US patent.
  • the granulating plant must therefor be installed in separate building where the high probability for explosion is take care of.
  • the present invention thus relates to a method for granulating metal melts, particularly silicon and alloys having a high silicon content, where a continuous stream of molten metal by means of at least one low pressure gas stream is divided into metal droplets, which gas stream gives the metal droplets a forward and upward movement and where the metal droplets are collected in a flume with flowing water where the droplets are cooled and thereafter transported to a collecting unit.
  • the metal stream is divided into metal droplets by means at three gas streams arranged at different vertical levels, where the upper gas stream introduces disturbance in the continuous metal stream, where the middle gas stream divides the metal stream into metal droplets and where the lower gas stream provides a forward and upward movement to the metal droplets before the metal droplets hit the flowing water in the flume.
  • the gas stream or gas streams preferably have a pressure of less than 1 bar overpressure.
  • the metal stream is divided into droplets having a size within a selected interval, for instance between 1 and 12 mm and where the part of particles outside the selected interval is very small.
  • the particles Due to the fact that the particles are given an upward and forward movement, the particles will get a solid film on their surfaces before the particles hit the water. Further the low pressure gas stream will spread the particles before they hit the water in the flume. The risk for explosions is thereby substantially reduced compared to the conventional methods.
  • the present invention further relates to an apparatus for granulating metal melts, which apparatus comprises a reservoir for molten metal having means for pouring a continuous stream of molten metal from the reservoir, at least one nozzle for directing a gas stream against the metal stream, and a flume having means for providing a continuous water flow in the flume, said flume being arranged at a lower level than the gas nozzle or the gas nozzles.
  • the apparatus comprises three nozzles for directing a gas stream against the molten metal stream, which nozzles are arranged at different vertical levels and where the gas stream can be regulated individually for each nozzle.
  • Figure 1 shows a side elevation of an embodiment of the apparatus according to the present invention
  • Figure 2 shows a side elevation of a second embodiment of the apparatus according to the present invention.
  • FIG 1 there is shown an embodiment of the apparatus according to the present invention.
  • FIG 1 there is shown a reservoir 1 intended to contain molten metal.
  • the reservoir 1 can be a tiltable ladle or the like.
  • a metal stream 2 is poured from the reservoir 1 at a constant amount of metal per unit of time by tilting the reservoir 1 or by other conventional means.
  • a gas nozzle 3 is arranged in such a way that a continuous gas stream hits the metal stream 2.
  • the gas stream has such a velocity that the metal stream is divided into metal droplets 4 when the gas stream hits the metal stream and to provide a forward and upward movement to the metal droplets 4 as shown in Figure 1.
  • a flume 5 having a small angle to the horizontal is arranged below the gas nozzle 3.
  • the flume 5 has means (not shown) for continuous supply of water to the upper end of the flume 5.
  • FIG 2 there is shown a second embodiment of the apparatus according to the invention.
  • the apparatus shown in Figure 2 is identical to the apparatus shown in Figure 1 , except that it is arranged three gas nozzles at different vertical levels. Parts on Figure 2 corresponding to parts on Figure 1 have identical reference numerals.
  • the upper gas nozzle 10 is intended to provide a gas stream against the metal stream 2 inducing disturbances to the metal stream 2, but does not divide the metal stream 2 into metal droplets.
  • the middle gas nozzle 11 is intended to divide the metal stream 2 into metal droplets 4, while the lower gas nozzle 12 is intended to provide a gas stream which gives the metal droplets a forward and upward movement.
  • Molten silicon with a purity of 98 % by weight was granulated in the apparatus shown in Figure 1.
  • the amount of silicon poured was 150 kg/min and air was used as gas in the gas nozzle. It was obtained granules of silicon where 99 % by weight had a diameter of less then 10 mm, 55 % by weight had a diameter below 5 mm, 20 % by weight had a diameter of less then 3 mm and only 2 % by weight had a diameter less then 1 mm.
  • EXAMPLE 2 An alloy consisting of 75 % by weight of silicon, the reminder being iron except for minor impurities, was granulated in the apparatus shown in Figure 1. The amount of alloy poured was 60 kg/min. The particle size distribution of the produced granules was 99 % by weight less than 10 mm and 4 % by weight was than 1 mm. The mean granule size was 4 mm.

Abstract

The present invention relates to a method for granulating metal melts, where a continuous stream of molten metal by means of at least one low pressure gas stream is divided into metal droplets, which gas stream gives the metal droplets a forward and upward movement and where the metal droplets are collected in a flume with flowing water where the droplets are cooled and thereafter transported to a collecting unit. The invention further relates to an apparatus for granulating metal melts, comprising a reservoir (1) for molten metal having means for pouring a continuous stream of molten metal (2) from the reservoir (1), at least one nozzle (3) for directing a low pressure gas stream against the metal stream (2), and a flume (5) having means for providing a continuous water flow in the flume, said flume being arranged at a lower level than the gas nozzle or the gas nozzles (3).

Description

Title of Invention
Method and apparatus for granulating molten metal.
Technical Field The present invention relates to a method and an apparatus for granulating molten metals and alloys, particularly silicon and alloys having a high content of silicon such as ferrosilicon.
Background Technology
From US patent No. 3,888,956 it is known a method for granulating molten metals, particularly molten iron, where the molten metal is caused to fall against a planar, fixed, unmoveable arranged disk, whereby the molten metal by its own kinetic energy split up is crushed against the disk to irregularly formed droplets which droplets move outwardly and fall down in a bath of cooling liquid below the disk. By this known method it is possible to produce metal granules, but the method has a number of drawbacks and disadvantages. It is thus not possible to regulate particle size and particle size distribution to any extent, as the droplets that form when the metal stream hits the disk will range from very small droplets to big droplets. By production of for instance granules of ferroalloy melts such as FeCr, FeSi, SiMn and others, a large part of granules or particles having a particle size less then 5 mm are formed. By production of ferrosilicon granules the part of particles having a particle size of less than 5 mm in typically in the range of 22 - 35 % of granulated melt and the mean particle size is about 7 mm. For ferrosilicon, particles having a size of below 5 mm are not wanted. Further, particles having a particle size below 1 mm are particularly harmful as such particles will be suspended in the bath of cooling liquid and necessitate a continuous cleaning of the cooling liquid.
The method according to US patent No. 3,888,956 has further shown to be exposed to explosions particularly when granulating silicon and alloys having a high content of silicon and a low content of easily oxidising alloying elements such as Ca and AI. The reason that explosions occur is that all particles have not got a shell of solidified alloy before they hit the cooling liquid bath and that the film of water vapour that forms around each particle in the cooling bath may collapse and result in vapour explosions. Larger and minor explosions therefor occur by use of the method according to the US patent. The granulating plant must therefor be installed in separate building where the high probability for explosion is take care of.
From EP-A-372918 it is known a method for atomising metal melts. By this method it is used an inert gas at a very high velocity to split the metal stream into very small droplets and final cooling of the atomised droplets takes place in an inert gas atmosphere. This method will only give satisfactory particle size for a product with particles less then 2 mm and will give a major size of particles less then 0,1 mm and is therefor not suitable for products having a particle size of more then 1 mm.
From WO 97/09145 it is known that metal droplets can be formed directly in water and thereafter being solidified and cooled in a water stream in a downwardly slooping flume. By this method it is produced granules of larger size, typically 5 to 40 mm. The method has however, the drawback that the risk of vapour explosions is high as the surface of the liquid metals comes in direct contact with water.
Description of invention
By the present invention one has now arrived at a method for granulation of metal melts where the drawbacks of the existing methods have been overcome both in the ability to produce granules with very low amount of particles below 1 mm and strongly reducing the risk of vapour explosions.
The present invention thus relates to a method for granulating metal melts, particularly silicon and alloys having a high silicon content, where a continuous stream of molten metal by means of at least one low pressure gas stream is divided into metal droplets, which gas stream gives the metal droplets a forward and upward movement and where the metal droplets are collected in a flume with flowing water where the droplets are cooled and thereafter transported to a collecting unit. According to a preferred embodiment, the metal stream is divided into metal droplets by means at three gas streams arranged at different vertical levels, where the upper gas stream introduces disturbance in the continuous metal stream, where the middle gas stream divides the metal stream into metal droplets and where the lower gas stream provides a forward and upward movement to the metal droplets before the metal droplets hit the flowing water in the flume.
The gas stream or gas streams preferably have a pressure of less than 1 bar overpressure.
By regulating the amount, velocity and direction of the gas stream or the gas streams in relation to the metal stream, the metal stream is divided into droplets having a size within a selected interval, for instance between 1 and 12 mm and where the part of particles outside the selected interval is very small.
Due to the fact that the particles are given an upward and forward movement, the particles will get a solid film on their surfaces before the particles hit the water. Further the low pressure gas stream will spread the particles before they hit the water in the flume. The risk for explosions is thereby substantially reduced compared to the conventional methods.
The present invention further relates to an apparatus for granulating metal melts, which apparatus comprises a reservoir for molten metal having means for pouring a continuous stream of molten metal from the reservoir, at least one nozzle for directing a gas stream against the metal stream, and a flume having means for providing a continuous water flow in the flume, said flume being arranged at a lower level than the gas nozzle or the gas nozzles.
According to a preferred embodiment the apparatus comprises three nozzles for directing a gas stream against the molten metal stream, which nozzles are arranged at different vertical levels and where the gas stream can be regulated individually for each nozzle.
It has been found that by the method of the present invention it is possible to produce granules having a very low amount of particles below 1 mm. It has further been found that by the method of the present invention the risk for vapour explosions is substantially reduced wen granulating silicon and alloys having a high content of silicon. The reason being that the granules formed by the gas stream or gas streams are kept in air for a time sufficient to form a solid film of metal or alloy on the surface of each granule before the granules hits the cooling water in the flume.
Shot description of the drawings
Figure 1 shows a side elevation of an embodiment of the apparatus according to the present invention, and
Figure 2 shows a side elevation of a second embodiment of the apparatus according to the present invention.
Detailed description of the invention
On figure 1 there is shown an embodiment of the apparatus according to the present invention.
On figure 1 there is shown a reservoir 1 intended to contain molten metal. The reservoir 1 can be a tiltable ladle or the like. A metal stream 2 is poured from the reservoir 1 at a constant amount of metal per unit of time by tilting the reservoir 1 or by other conventional means. A gas nozzle 3 is arranged in such a way that a continuous gas stream hits the metal stream 2. The gas stream has such a velocity that the metal stream is divided into metal droplets 4 when the gas stream hits the metal stream and to provide a forward and upward movement to the metal droplets 4 as shown in Figure 1. A flume 5 having a small angle to the horizontal is arranged below the gas nozzle 3. The flume 5 has means (not shown) for continuous supply of water to the upper end of the flume 5. When the metal droplet hit the water in the flume 5 they will be cooled and transported to the lower end of the flume where they are separated from the water in conventional ways such as a tank 6 equipped with a transport screw or a cell feeder 7 in the bottom for transporting the finished granules out of the tank 6.
In Figure 2 there is shown a second embodiment of the apparatus according to the invention. The apparatus shown in Figure 2 is identical to the apparatus shown in Figure 1 , except that it is arranged three gas nozzles at different vertical levels. Parts on Figure 2 corresponding to parts on Figure 1 have identical reference numerals.
In the embodiment shown in Figure 2 there are arranged three gas nozzles 10, 11 , 12. The upper gas nozzle 10 is intended to provide a gas stream against the metal stream 2 inducing disturbances to the metal stream 2, but does not divide the metal stream 2 into metal droplets. The middle gas nozzle 11 is intended to divide the metal stream 2 into metal droplets 4, while the lower gas nozzle 12 is intended to provide a gas stream which gives the metal droplets a forward and upward movement.
By regulating the gas streams from the gas nozzles 10, 11 and 12 to suitable values, it will be formed metal droplets 4 having such a retention time before they hit the water in the flume 5, that a solid film will be formed on each metal droplet.
Even if the embodiments shown in Figure 1 and Figure 2 have one, respectively three gas nozzles, it is understood that the apparatus according to the invention can have two gas nozzles or more than three gas nozzles.
By the method and apparatus according to the present invention, the possibility of explosion is substantially reduced as the metal droplets will have a solid film on the surface before they hit the water in the flume 5. There will thus not be any direct contact between liquid metal and cooling liquid. EXAMPLE 1
Molten silicon with a purity of 98 % by weight was granulated in the apparatus shown in Figure 1. The amount of silicon poured was 150 kg/min and air was used as gas in the gas nozzle. It was obtained granules of silicon where 99 % by weight had a diameter of less then 10 mm, 55 % by weight had a diameter below 5 mm, 20 % by weight had a diameter of less then 3 mm and only 2 % by weight had a diameter less then 1 mm.
EXAMPLE 2 An alloy consisting of 75 % by weight of silicon, the reminder being iron except for minor impurities, was granulated in the apparatus shown in Figure 1. The amount of alloy poured was 60 kg/min. The particle size distribution of the produced granules was 99 % by weight less than 10 mm and 4 % by weight was than 1 mm. The mean granule size was 4 mm.

Claims

Claims:
1. Method for granulating metal melts, particularly silicon and alloys having a high silicon content, ch a racterized i n that a continuous stream of molten metal by means of at least one low pressure gas stream is divided into metal droplets, which gas stream gives the metal droplets a forward and upward movement and where the metal droplets are collected in a flume with flowing water where the droplets are cooled and thereafter transported to a collecting unit.
2. Method according to claim 1, characterized in that the metal stream is divided into metal droplets by means of three low pressure gas streams arranged at different vertical levels, where the upper gas stream introduces disturbance in the continuous metal stream, where the middle gas stream divides the metal stream into metal droplets and where the lower gas stream provides a forward and upward movement to the metal droplets before the metal droplets hit the flowing water in the flume.
3. Method according to claim 1, characterized i n that the gas pressure is less than 1 bar overpressure.
4. Apparatus for granulating metal melts, particularly silicon and alloys having a high silicon content, ch a racte rized i n that the apparatus comprises a reservoir (1) for molten metal having means for pouring a continuous stream of molten metal (2) from the reservoir (1), at least one nozzle (3) for directing a low pressure gas stream against the metal stream (2), and a flume (5) having means for providing a continuous water flow in the flume, said flume being arranged at a lower level than the gas nozzle or the gas nozzles (3).
5. Apparatus according to claim 4, c h a ra cte rized i n that the apparatus comprises three nozzles (10, 11, 12) for directing a low pressure gas stream against the stream of molten metal, where the nozzles are arranged at different vertical levels and where the gas stream can be regulated separately for each nozzle.
PCT/NO2003/000192 2002-06-17 2003-06-12 Method and apparatus for granulating molten metal WO2003106012A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003277245A AU2003277245A1 (en) 2002-06-17 2003-06-12 Method and apparatus for granulating molten metal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20022881 2002-06-17
NO20022881A NO20022881L (en) 2002-06-17 2002-06-17 Method and apparatus for granulating metal melts

Publications (1)

Publication Number Publication Date
WO2003106012A1 true WO2003106012A1 (en) 2003-12-24

Family

ID=19913727

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2003/000192 WO2003106012A1 (en) 2002-06-17 2003-06-12 Method and apparatus for granulating molten metal

Country Status (3)

Country Link
AU (1) AU2003277245A1 (en)
NO (1) NO20022881L (en)
WO (1) WO2003106012A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2181785A1 (en) 2008-11-04 2010-05-05 Umicore AG & Co. KG Device and method of granulating molten metal
CN101988168A (en) * 2010-11-22 2011-03-23 张五越 Smelting device of nickel-based intermediate alloy and preparation method thereof
US8048221B2 (en) 2006-01-20 2011-11-01 Stoddard Nathan G Methods and apparatuses for manufacturing monocrystalline cast silicon and monocrystalline cast silicon bodies for photovoltaics
US8440157B2 (en) 2007-07-20 2013-05-14 Amg Idealcast Solar Corporation Methods and apparatuses for manufacturing cast silicon from seed crystals
US8591649B2 (en) 2007-07-25 2013-11-26 Advanced Metallurgical Group Idealcast Solar Corp. Methods for manufacturing geometric multi-crystalline cast materials
US8709154B2 (en) 2007-07-25 2014-04-29 Amg Idealcast Solar Corporation Methods for manufacturing monocrystalline or near-monocrystalline cast materials
CN113333766A (en) * 2021-06-24 2021-09-03 广东长信精密设备有限公司 Automatic change pelletization device
EP3988230A1 (en) 2020-10-23 2022-04-27 Heraeus Deutschland GmbH & Co. KG Granulating apparatus with continuous product discharge

Citations (7)

* Cited by examiner, † Cited by third party
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
US3150947A (en) * 1961-07-13 1964-09-29 Flex O Lite Mfg Corp Method for production of glass beads by dispersion of molten glass
GB1415227A (en) * 1972-12-13 1975-11-26 Hoechst Ag Process and apparatus for making metal powders
US4218201A (en) * 1978-07-25 1980-08-19 Nippon Steel Corporation Apparatus for producing solidified granular slag from molten blast furnace slag
FR2527940A1 (en) * 1982-06-02 1983-12-09 Cirm Molten slag granulation - using high pressure gas jets to produce round slag granules
US4671752A (en) * 1983-05-10 1987-06-09 Mitsubishi Jukogyo Kabushiki Kaisha Air-pulverizing apparatus for high-temperature molten slag
EP0372918A2 (en) * 1988-12-08 1990-06-13 Elkem A/S Silicon powder and method for its production

Patent Citations (7)

* Cited by examiner, † Cited by third party
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
US3150947A (en) * 1961-07-13 1964-09-29 Flex O Lite Mfg Corp Method for production of glass beads by dispersion of molten glass
GB1415227A (en) * 1972-12-13 1975-11-26 Hoechst Ag Process and apparatus for making metal powders
US4218201A (en) * 1978-07-25 1980-08-19 Nippon Steel Corporation Apparatus for producing solidified granular slag from molten blast furnace slag
FR2527940A1 (en) * 1982-06-02 1983-12-09 Cirm Molten slag granulation - using high pressure gas jets to produce round slag granules
US4671752A (en) * 1983-05-10 1987-06-09 Mitsubishi Jukogyo Kabushiki Kaisha Air-pulverizing apparatus for high-temperature molten slag
EP0372918A2 (en) * 1988-12-08 1990-06-13 Elkem A/S Silicon powder and method for its production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KIEFFER R. DR. ET AL.: "Sintereisen und Sinterstahl", 1948, SPRINGER, WIEN, pages: 28, XP002967997 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8048221B2 (en) 2006-01-20 2011-11-01 Stoddard Nathan G Methods and apparatuses for manufacturing monocrystalline cast silicon and monocrystalline cast silicon bodies for photovoltaics
US8628614B2 (en) 2006-01-20 2014-01-14 Amg Idealcast Solar Corporation Methods and apparatus for manufacturing monocrystalline cast silicon and monocrystalline cast silicon bodies for photovoltaics
US8951344B2 (en) 2006-01-20 2015-02-10 Amg Idealcast Solar Corporation Methods and apparatuses for manufacturing geometric multicrystalline cast silicon and geometric multicrystalline cast silicon bodies for photovoltaics
US8440157B2 (en) 2007-07-20 2013-05-14 Amg Idealcast Solar Corporation Methods and apparatuses for manufacturing cast silicon from seed crystals
US8591649B2 (en) 2007-07-25 2013-11-26 Advanced Metallurgical Group Idealcast Solar Corp. Methods for manufacturing geometric multi-crystalline cast materials
US8709154B2 (en) 2007-07-25 2014-04-29 Amg Idealcast Solar Corporation Methods for manufacturing monocrystalline or near-monocrystalline cast materials
EP2181785A1 (en) 2008-11-04 2010-05-05 Umicore AG & Co. KG Device and method of granulating molten metal
US8608823B2 (en) 2008-11-04 2013-12-17 Umicore Ag & Co. Kg Apparatus and process for granulating a metal melt
CN101988168A (en) * 2010-11-22 2011-03-23 张五越 Smelting device of nickel-based intermediate alloy and preparation method thereof
EP3988230A1 (en) 2020-10-23 2022-04-27 Heraeus Deutschland GmbH & Co. KG Granulating apparatus with continuous product discharge
CN113333766A (en) * 2021-06-24 2021-09-03 广东长信精密设备有限公司 Automatic change pelletization device

Also Published As

Publication number Publication date
NO20022881L (en) 2003-12-18
AU2003277245A1 (en) 2003-12-31
NO20022881D0 (en) 2002-06-17

Similar Documents

Publication Publication Date Title
EP0522844B1 (en) Method for granulating molten metal
EP0409905B1 (en) Atomising apparatus and process
US4897111A (en) Method for the manufacture of powders from molten materials
JPH0135881B2 (en)
WO2003106012A1 (en) Method and apparatus for granulating molten metal
CN1123416C (en) Production of metal lumps
US20120195786A1 (en) Production of spheroidal metal particles
JP2642060B2 (en) Method and apparatus for producing reactive metal particles
JPS63503468A (en) Molten material granulation equipment
JPS58124528A (en) Spherical product of sublimable substance, method and apparatus for preparing same
GB1565939A (en) Production of metal and alloy granulates
US6461403B1 (en) Apparatus and method for the formation of uniform spherical particles
DK2689873T3 (en) Process for preparing a powder of a metal alloy
Henein Why is spray forming a rapid solidification process?
US3532775A (en) Method for producing aluminum particles
RU2232066C1 (en) Method for producing pelletized magnesium or its alloys
GB2187762A (en) Metal powder by atomization process
CA1082413A (en) Production of metal powder
JPH0415161B2 (en)
WO2024018916A1 (en) Granular iron manufacturing device and granular iron manufacturing method
EP3290136A1 (en) Method for the production of metallic powders
JPS6193823A (en) Spheriform sublimable substance and its preparation
Forwald et al. Method for Granulating Molten Metal
AU759115B2 (en) Apparatus and method for the formation of uniform spherical particles
SU1652030A1 (en) Device for producing metallic granules

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP