GB377239A - An improved process for producing diamonds - Google Patents
An improved process for producing diamondsInfo
- Publication number
- GB377239A GB377239A GB2018/31A GB201831A GB377239A GB 377239 A GB377239 A GB 377239A GB 2018/31 A GB2018/31 A GB 2018/31A GB 201831 A GB201831 A GB 201831A GB 377239 A GB377239 A GB 377239A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbon
- pressure
- melt
- atmospheres
- dioxide
- 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
Links
Classifications
-
- 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
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
-
- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0605—Composition of the material to be processed
- B01J2203/061—Graphite
-
- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/065—Composition of the material produced
- B01J2203/0655—Diamond
-
- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0675—Structural or physico-chemical features of the materials processed
- B01J2203/068—Crystal growth
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
<PICT:0377239/III/1> Diamonds are produced artificially from melts capable of yielding carbon in a free condition by subjecting the melt to increases and decreases of pressure, the decreases in pressure being made more rapidly than the increases. Amorphous carbon, e.g. graphite, is added to the melt, which may be of iron, nickel, cobalt, silver or silicates, together with a carbon compound, e.g. solid carbon dioxide or liquid carbon monoxide, also supplied during the operation. The final temperature attained is about 1000 DEG C. and the pressure may vary from 500 atmospheres to a final pressure of 15000 atmospheres. The melt is preferably composed of materials which act catalytically and easily dissolve the carbon compounds, e.g. iron, nickel, cobalt and their oxides. In an example, a melt consisting of 60 to 90 per cent of iron filings, 25 to 5 of blast furnace slag, and 15 to 5 of amorphous carbon is placed in a chamber 5 in a steel block 1 together with 30 per cent of solid carbon dioxide. Secured to the upper block 1 by insulated bolts 8 and separated therefrom by an insulating layer 4 is a lower steel block 2, a tubular passage 10 for carbon monoxide or dioxide being provided therein. Pressure is furnished by a hydraulic ram 3 provided with packing 9 and also by the gas supplied. Heating is effected by the resistance of the blocks 1, 2 to current supplied by leads 6, 7. In operation, the melt is liquefied by heating to about 1000 DEG C. and a pressure of 5000 atmospheres is applied, some of the carbon and the carbon dioxide dissolved giving rise to the production of carbon monoxide. Pressure is now increased to 15000 atmospheres over a period of 90 seconds during which time carbon monoxide is converted to carbon and dioxide. After a further period of 10 to 20 seconds, the heating and pressure are simultaneously interrupted, the sudden release of pressure which is effected serving to prevent carbon in the diamond form reverting to the amorphous form. This procedure is repeated three or four times.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT377239X | 1930-01-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB377239A true GB377239A (en) | 1932-07-21 |
Family
ID=3673069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2018/31A Expired GB377239A (en) | 1930-01-21 | 1931-01-21 | An improved process for producing diamonds |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB377239A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2947608A (en) * | 1955-08-29 | 1960-08-02 | Gen Electric | Diamond synthesis |
US2947611A (en) * | 1958-01-06 | 1960-08-02 | Gen Electric | Diamond synthesis |
US2947609A (en) * | 1958-01-06 | 1960-08-02 | Gen Electric | Diamond synthesis |
US2996763A (en) * | 1956-01-31 | 1961-08-22 | Gen Electric | Diamond material |
US3030188A (en) * | 1958-07-23 | 1962-04-17 | Union Carbide Corp | Synthesis of diamond |
US3030187A (en) * | 1958-07-23 | 1962-04-17 | Union Carbide Corp | Synthesis of diamond |
-
1931
- 1931-01-21 GB GB2018/31A patent/GB377239A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2947608A (en) * | 1955-08-29 | 1960-08-02 | Gen Electric | Diamond synthesis |
US2996763A (en) * | 1956-01-31 | 1961-08-22 | Gen Electric | Diamond material |
US2947611A (en) * | 1958-01-06 | 1960-08-02 | Gen Electric | Diamond synthesis |
US2947609A (en) * | 1958-01-06 | 1960-08-02 | Gen Electric | Diamond synthesis |
US3030188A (en) * | 1958-07-23 | 1962-04-17 | Union Carbide Corp | Synthesis of diamond |
US3030187A (en) * | 1958-07-23 | 1962-04-17 | Union Carbide Corp | Synthesis of diamond |
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