US2448243A - Process of producing magnesium powder by cold rolling and grinding - Google Patents
Process of producing magnesium powder by cold rolling and grinding Download PDFInfo
- Publication number
- US2448243A US2448243A US540551A US54055144A US2448243A US 2448243 A US2448243 A US 2448243A US 540551 A US540551 A US 540551A US 54055144 A US54055144 A US 54055144A US 2448243 A US2448243 A US 2448243A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- grinding
- cold rolling
- metal
- powder
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 42
- 238000000034 method Methods 0.000 title description 17
- 230000008569 process Effects 0.000 title description 14
- 238000005097 cold rolling Methods 0.000 title description 7
- 238000000227 grinding Methods 0.000 title description 6
- 229910052749 magnesium Inorganic materials 0.000 description 35
- 239000011777 magnesium Substances 0.000 description 35
- 239000013078 crystal Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000000859 sublimation Methods 0.000 description 4
- 230000008022 sublimation Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000003621 hammer milling Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- -1 magnesium metals Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S241/00—Solid material comminution or disintegration
- Y10S241/14—Grinding in inert, controlled atmosphere
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S29/00—Metal working
- Y10S29/027—Method or apparatus using magnesium
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S29/00—Metal working
- Y10S29/031—Pressing powder with other step
Definitions
- This invention relates to a process for treating magnesium metal to produce powdered magnesium.
- the crystalline deposit so obtained is quite malleable, and it has been iound in practice that such a deposit cannot be satisfactorily reduced to a powder by direct introduction into a hammer mill or other mechanicalreduction device.
- the crystalline magnesium can be reduced to powder form by first flattening the crystallineagglomerates, or mechanically extending them along one general plane or axis, and then subjecting the flattened metal to the action of a hammer mill or other mechanical reduction device.
- the flattening oi the metal evidently causes the crystals to become brittle and they are then. easily powdered by a pounding or beating action as effected by a hammer mill.
- the crystalline magnesium is rolled in the cold state and then subjected to treatment by a hammering action,
- the cold rolled'crystal's are readily reduced to the pow dered state by hammering in a hammer mill or the like. It is advantageous to cold roll the crystals rapidly.
- distortion eflects are obtained in this manner which enable the production of many cleavages and, thereby, the producing ot 'a finely divided magnesium product.
- the flattening advantageously by cold rolling, and the hammering can be eiiected satisfactorily in thepresence of air.
- the operations can be carried out in an inert atmosphere, as for example by maintaining an atmosphere of hydrogen, argon or other inert gas about the rolls or mills, suitably housed, or the metal can be protected during working by application of a surface coating of a liquid hydrocarbon, preferably a low gravity liquid hydrocarbon such as kerosene or distillate.
- the method of carrying ou my process I use as a starting material magnesium produced by the reduction of magnesia with a carbonaceous reducing agent such as coke and subsequent refining of the crude condensate by distillation to recover sublimed magnesium as 1 crystals.
- the crystals deposit in the flnal stage as an irregular mass.
- This cooled crystalline mass is fed quickly thru a set of steel rolls.
- the rolled and flattened mass of magnesium is now run through a hammer mill and the resulting powder is screened.
- the coarser particles are again fed through the rolls and are put through the hammer mill again and these operations repeated once more to reduce the whole mess to a suitable state of subdivision.
- the final product has the following fineness: It all passes a 10 mesh screen, 2% remaining on a 20 mesh screen, 46% on a 50 mesh screen, 29%
- the crystalline magnesium may be pressed or hammeredflat prior to grinding or hammer milling.
- a process for producing powdered magnesium which comprises cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanically extending the magnesium crystals along a crystal axis, and disintegrating the said cold rolled magnesium by hammering, the rolling and hammering being conducted in an inert atmosphere.
- a process for producing powdered magnesium which comprises cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanically extending the magnesium crystals along a crystal axis, and disintegratin said cold rolled magnesium by grinding, the rolling and grinding being conducted in an inert atmosphere.
- a process for producing powdered magnesium which comprises rapidly cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanicallyextending the magnesium crystals along a crystal axis, and hammering to disintegrate said cold rolled magnesium,v the magnesium having thereon a protective surface coating of low gravity liquid hydrocarbon.
- a process of producing powdered magnesium which comprises embrittling malleable magnesium by rapidly cold rolling the bulk metal in a. manner to extend and distort the magnesium crystals along a crystal axis and then producing multiple cleavages in the magnesium crystals by subjecting the rolled metal to a hammering action until magnesium powder is produced.
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
Patented Aug". 31, 1948 UNITED s'rArEs PATENT OFFICE z,44a.24a
POWDER BY COLD GRINDING ROLLING AND Harold r. Anderson, Mountain View, Calif., as-
signonby mesne assignments, to
The Permanente Metals Corporation, a corporation of Delaware No Drawing.
'paumion June 15, 1944,
This invention relates to a process for treating magnesium metal to produce powdered magnesium.
It is contemplated by this invention to produce powdered, or finely divided, magnesium metal which may be used as flashlight powder, as an incendiary material for instance in fireworks or the like, or as a chemical reagent.
Magnesium metal as obtained, for example, by the sublimation of metallic magnesium or bythe reduction of magnesium containing ores with reducing agents which give, except for the magnesium, non-gaseous reaction products, is recovered in a condensing device in the form of crystals which deposit in agglomerat'e masses. The crystalline deposit so obtained is quite malleable, and it has been iound in practice that such a deposit cannot be satisfactorily reduced to a powder by direct introduction into a hammer mill or other mechanicalreduction device.
It has accordingly been the ordinary procedure to reduce crystalline magnesium to powdered form by casting into cylinders or ingots, milling the ingots into shavings, and then running these shavings thru a hammer mill or similar device.
Other processes have been devised for the production of magnesium powder such as directing a jet of gas against a stream-oi molten metal as the latter is forced downwardly out 01' the lower part of a melting vessel, or volatilizing the metal in an inert gas and chilling with a stream of cool gas to cause condensation of finely divided metal. In general, however, the cheapest, and most satisfactory method of making the powder has been to cast, form shavings or other thin pieces from the cast mass, and subject the shavings to the action of a hammer mill. In all of these methods, the crystalline magnesium has been first subjected to a heat treatment and, in casting at least, with consequent rearrangement or re-alignment oi the crystals.
I have now discovered that the crystalline magnesium can be reduced to powder form by first flattening the crystallineagglomerates, or mechanically extending them along one general plane or axis, and then subjecting the flattened metal to the action of a hammer mill or other mechanical reduction device. The flattening oi the metal evidently causes the crystals to become brittle and they are then. easily powdered by a pounding or beating action as effected by a hammer mill.
Advantageously the crystalline magnesium is rolled in the cold state and then subjected to treatment by a hammering action, The cold rolled'crystal's are readily reduced to the pow dered state by hammering in a hammer mill or the like. It is advantageous to cold roll the crystals rapidly. Evidently distortion eflects are obtained in this manner which enable the production of many cleavages and, thereby, the producing ot 'a finely divided magnesium product.
It is an advantage oi my process that the number of steps in the production of magnesium powder from refined magnesium metals are reduced. It is a further advantage that mechanical losses 0! metal such as are usually incurred in casting, shaving and other handling are avoided. It is a great advantage of my process that heating of the metal, with consequent dangers of loss by increased oxidation or necessity for increased protection irom atmospheric action upon the metal, is avoided.
In my process the flattening, advantageously by cold rolling, and the hammering can be eiiected satisfactorily in thepresence of air. If it be desired to prevent even small amounts oi! atmospheric degradation of the metal, the operations can be carried out in an inert atmosphere, as for example by maintaining an atmosphere of hydrogen, argon or other inert gas about the rolls or mills, suitably housed, or the metal can be protected during working by application of a surface coating of a liquid hydrocarbon, preferably a low gravity liquid hydrocarbon such as kerosene or distillate.
As an example oi. the method of carrying ou my process, I use as a starting material magnesium produced by the reduction of magnesia with a carbonaceous reducing agent such as coke and subsequent refining of the crude condensate by distillation to recover sublimed magnesium as 1 crystals. The crystals deposit in the flnal stage as an irregular mass. This cooled crystalline mass is fed quickly thru a set of steel rolls. The rolled and flattened mass of magnesium is now run through a hammer mill and the resulting powder is screened. The coarser particles are again fed through the rolls and are put through the hammer mill again and these operations repeated once more to reduce the whole mess to a suitable state of subdivision.
The final product has the following fineness: It all passes a 10 mesh screen, 2% remaining on a 20 mesh screen, 46% on a 50 mesh screen, 29%
on an mesh screen, and'23% passes through 80 mesh. The product is excellent as a flashlight powder, being ignited very easily when a small amount of potassium chlorate is admixed therewith. 'It is useful in powder metallurgical processes and it is also useful as a. component of flares and the like.
Alternatively, the crystalline magnesium may be pressed or hammeredflat prior to grinding or hammer milling. However, it is more convenient, and it is preferable to flatten the crystals by passing them quickly through a rolling operation. The more quickly the crystals are flattened, or mechanically extended along one plane or axis, the greater are the distortion strains set up and the better the results in the final reduction to powder.
It is to be understood that the above description and example are illustrative only and variations and modifications may be made therein without departing from the spirit and scope of this invention. I
Having now described my invention, what I Wish to claim is:
l. A process for producing powdered magnesium which comprises cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanically extending the magnesium crystals along a crystal axis, and disintegrating the said cold rolled magnesium by hammering, the rolling and hammering being conducted in an inert atmosphere.
2. A process for producing powdered magnesium which comprises cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanically extending the magnesium crystals along a crystal axis, and disintegratin said cold rolled magnesium by grinding, the rolling and grinding being conducted in an inert atmosphere.
3. A process for producing powdered magnesium which comprises rapidly cold rolling crystalline magnesium obtained by sublimation to make the magnesium brittle by mechanicallyextending the magnesium crystals along a crystal axis, and hammering to disintegrate said cold rolled magnesium,v the magnesium having thereon a protective surface coating of low gravity liquid hydrocarbon.
to distort the crystals 4. A process of producing powdered magnesium which comprises embrittling malleable magnesium by rapidly cold rolling the bulk metal in a. manner to extend and distort the magnesium crystals along a crystal axis and then producing multiple cleavages in the magnesium crystals by subjecting the rolled metal to a hammering action until magnesium powder is produced.
5. The process of claim 4 wherein the cold rolled magnesium is covered -with a protective surface coating of low specific gravity liquid hydrocarbon before being subjected to the hammering action. a
6. The process of claim 4, wherein the cold rolled metal is disintegrated by grinding the same in an inert atmosphere.
7. The process of claim 4, wherein the magnesium powder is screened and the coarse portion is repeatedly subjected to cold rolling and hammering operations until the desired state of subdivision is reached.
HAROLD P. ANDERSON.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS OTHER REFERENCES Noel, article in Transactions of American Institute of Mining and Metallurgical Engineers (1938) vol. 128, pages 37-41, noting particularly page 39.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US540551A US2448243A (en) | 1944-06-15 | 1944-06-15 | Process of producing magnesium powder by cold rolling and grinding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US540551A US2448243A (en) | 1944-06-15 | 1944-06-15 | Process of producing magnesium powder by cold rolling and grinding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2448243A true US2448243A (en) | 1948-08-31 |
Family
ID=24155934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US540551A Expired - Lifetime US2448243A (en) | 1944-06-15 | 1944-06-15 | Process of producing magnesium powder by cold rolling and grinding |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2448243A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2601953A (en) * | 1948-08-12 | 1952-07-01 | Gen Electric | Process of making chemically active graphitic carbon powder |
| US2666696A (en) * | 1950-01-31 | 1954-01-19 | Rca Corp | Method of treating metal powders |
| US2902357A (en) * | 1954-06-11 | 1959-09-01 | Republic Steel Corp | Increasing the density of iron powder by alternate rolling and grinding |
| DE1213207B (en) * | 1961-09-29 | 1966-03-24 | Hitachi Ltd | Process for pulverizing grainy raw graphite |
| US3892833A (en) * | 1972-11-10 | 1975-07-01 | Matsushita Electric Industrial Co Ltd | Method of making an ion-selective electrode |
| US20080019857A1 (en) * | 2004-07-08 | 2008-01-24 | Katsuyoshi Kondoh | Magnesium Based Composite Powder, Magnesium Based Alloy Base Material and Manufacturing Method Thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1559484A (en) * | 1918-04-25 | 1925-10-27 | Earl G Watrous | Liquid-soap pump |
| US1594346A (en) * | 1922-11-01 | 1926-08-03 | American Magnesium Corp | Magnesium product |
| US1669649A (en) * | 1926-04-10 | 1928-05-15 | Western Electric Co | Magnetic material |
| US1930684A (en) * | 1929-09-30 | 1933-10-17 | Hartstoff Metall Ag | Method of manufacturing bronze colors |
| US2017850A (en) * | 1932-03-10 | 1935-10-22 | Aluminum Co Of America | Manufacture of aluminum bronze powder |
| CH199000A (en) * | 1937-11-22 | 1938-07-31 | Georg Benda Lutz Werke Ges M B | Process for the production of aluminum grit. |
-
1944
- 1944-06-15 US US540551A patent/US2448243A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1559484A (en) * | 1918-04-25 | 1925-10-27 | Earl G Watrous | Liquid-soap pump |
| US1594346A (en) * | 1922-11-01 | 1926-08-03 | American Magnesium Corp | Magnesium product |
| US1669649A (en) * | 1926-04-10 | 1928-05-15 | Western Electric Co | Magnetic material |
| US1930684A (en) * | 1929-09-30 | 1933-10-17 | Hartstoff Metall Ag | Method of manufacturing bronze colors |
| US2017850A (en) * | 1932-03-10 | 1935-10-22 | Aluminum Co Of America | Manufacture of aluminum bronze powder |
| CH199000A (en) * | 1937-11-22 | 1938-07-31 | Georg Benda Lutz Werke Ges M B | Process for the production of aluminum grit. |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2601953A (en) * | 1948-08-12 | 1952-07-01 | Gen Electric | Process of making chemically active graphitic carbon powder |
| US2666696A (en) * | 1950-01-31 | 1954-01-19 | Rca Corp | Method of treating metal powders |
| US2902357A (en) * | 1954-06-11 | 1959-09-01 | Republic Steel Corp | Increasing the density of iron powder by alternate rolling and grinding |
| DE1213207B (en) * | 1961-09-29 | 1966-03-24 | Hitachi Ltd | Process for pulverizing grainy raw graphite |
| US3892833A (en) * | 1972-11-10 | 1975-07-01 | Matsushita Electric Industrial Co Ltd | Method of making an ion-selective electrode |
| US20080019857A1 (en) * | 2004-07-08 | 2008-01-24 | Katsuyoshi Kondoh | Magnesium Based Composite Powder, Magnesium Based Alloy Base Material and Manufacturing Method Thereof |
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