CN86100026A - Diamond and graphite centrifugal classification new method - Google Patents
Diamond and graphite centrifugal classification new method Download PDFInfo
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- CN86100026A CN86100026A CN 86100026 CN86100026A CN86100026A CN 86100026 A CN86100026 A CN 86100026A CN 86100026 CN86100026 CN 86100026 CN 86100026 A CN86100026 A CN 86100026A CN 86100026 A CN86100026 A CN 86100026A
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Abstract
Adopt J-10 heavy-fluid directly to mix with the former state of dissociating of diamond, through centrifugal classification, the little graphite floatation of proportion is on the top of centrifuge tube, and heavy diamond sinks down into the bottom of centrifuge tube.Pour out graphite, just obtain being sunken to the pipe diamond at the end.
J-10 heavy-fluid is a kind of odorless, nontoxic, non-environmental-pollution, inexpensive transparency liquid.The present invention can eliminate the harm of strong acid-base to environment and operating personnel; The diamond rate of recovery is more than 99.5%; Production cost is 1.5 minutes/carat, is significantly less than current methods.
Description
The present invention is a kind of sorting new method in the diamond production process, be used for to synthetic diamond be not transformed into adamantine graphite and effectively separate, thereby reach the purpose of choosing diamond.
In the adamantine synthetic coupon, except diamond is arranged, the transmission medium that also has remaining a large amount of graphite, catalyst alloy and be mingled with-pyrophillite fragment.In the existing at home and abroad purification diamond technology, maximum difficulty is to remove graphite, because under high pressure have only the graphite about 1/5th to be transformed into diamond, all the other graphite still are mixed in the synthetic coupon.Because graphite has good chemical stability, general acid can not be dissolved it.Present diamond producer all adopt the mixed acid of perchloric acid or nitric acid and sulfuric acid come oxidation it, make graphite be oxidized to gas and separate with diamond.Owing to will carry out chemical treatment with strong acid such as a large amount of perchloric acid or sulfuric acid, nitric acid and hydrochloric acid, and under hot conditions, carry out, cause a large amount of acid vapours, sulphuric anhydride NO and NO
2Gas is accompanied by the gas that oxidized graphite generates and discharges together, not only environment is had serious pollution, and operating personnel's health is also had very big infringement.Simultaneously, boil perchloric acid under the high temperature and also have explosive unsafe factor.For this reason, Inst. of Geochemistry, Chinese Academy of Sciences once helps manufacturer to set up at the seventies and uses the adamantine method of separation by shaking table.Yet this method has its weak point, because the separation by shaking table water is cooked carrier, and diamond has strong-hydrophobicity, so the part diamond is run off, particularly fine grain diamond runs off very serious.Adopt the adamantine method of above sorting, expense is than higher, and cost is every carat of 6-7 branch, and labour intensity is big.In addition, at high temperature perchloric acid and sodium carbonate have stronger oxidation corrosion to diamond, cause adamantine loss.
In view of the foregoing, special artificial diamond and graphite centrifugal classification new method.Its purpose is pollution abatement, reduces cost, improves the rate of recovery of diamond, avoids the loss of diamond.
Particular content of the present invention is:
1. compound (hereinafter to be referred as the compound) ball milling that diamond in the coupon and graphite is reached dissociate with electrolysis or with the acid-hatching of young eggs is 30 minutes.
2. compound behind the ball milling and separating medium J-10 are put into centrifuge tube; the centrifuge tube volume is 250 milliliters; its ratio is: compound 100 grams behind the ball milling; 200 milligrams of separating mediums; centrifugal classification was shut down after 5 minutes; restarted centrifuge after stirring evenly centrifugal 10 minutes, the impurity that graphite is promptly bigger with diamond and proportion-, produce layering as catalyst alloy and metallic compound etc.Above graphite floated on, the impurity that diamond and proportion are bigger was deposited in the bottom of centrifuge tube.
3. diamond and separating medium are poured in the glass sand hourglass, or directly filter in the impouring filter, glass sand hourglass is contained on the vacuum suction bottle, be connected with vacuum mechanical pump, start vavuum pump, the air in the vacuum suction bottle is discharged, pressure reduces in the bottle, separating medium solution is filtered in the bottle, has so both reached the purpose that diamond separates with separating medium, has reclaimed separating medium simultaneously again.
4. a small amount of separating medium water that will stick to diamond surface directly cleans on glass sand hourglass, and the separating medium that washes is promptly reusable (seeing accompanying drawing) after dewatering.
Characteristics of the present invention are: by the difference of separating medium, carry out separating of graphite and diamond with its physical property, and separating medium J-10.(being responsible for supply) nontoxic, odorless by Inst. of Geochemistry, Chinese Academy of Sciences, human body and environment are not polluted, easy to operate, safe and reliable, do not have any harmfulness, and can reclaim repeated use, good separation effect, graphite in the compound is removed in diamond, and the rate of recovery of diamond can reach more than 99.5%, and the thickness granularity of diamond is not limit.Also had the metal carbides of generation under remaining catalyst alloy of part electrolysis and the high pressure etc. in the diamond that sub-elects, these materials only need use a spot of rare bronsted lowry acids and bases bronsted lowry to handle can obtain pure artificial metal's stone.Its sorting cost is 1.5 minutes/carat.Adopt the present invention, not only efficiency of separation height can also be saved the sorting time greatly, reduces labour intensity, and diamond in cleaning process (comprising the fine grained diamond) does not have loss, and cost ratio used other method both at home and abroad reduces greatly.
Lifting an example below illustrates.
Take by weighing four parts with separating the compound that leaves, every part heavy 100 gram adds respectively in four 250 milliliters the centrifuge tube, pours 200 milliliters of J-10 heavy-fluids in each pipe at every turn, stirs with glass bar and makes it abundant mixing.Start centrifuge, make 1500 rev/mins of turn ups, turned round 5 minutes, behind the autostop, with glass bar the come-up sample in each centrifuge tube is stirred once again, carry out once more centrifugally, used rotating speed adds greatly 2000 rev/mins, centrifugation time 10 minutes.
Can know after the shutdown and see the top that graphite floats on centrifuge tube fully, diamond then sinks to the bottom of centrifuge tube down, and the middle part of centrifuge tube is transparent J-10 heavy-fluid.
The graphite on centrifuge tube top poured on the funnel of bleeding or on the filter filter, the heavy-fluid that leaches can directly be reused, and the diamond of centrifuge tube bottom is poured in another funnel of bleeding filtered.
Water obtains the diamond concentrate after cleaning diamond on the funnel.
Claims (4)
1, the new method of a kind of diamond and graphite centrifugal classification.It is characterized in that using heavy separating medium J-10, with electrolysis or make diamond in the coupon and graphite reach the compound (hereinafter to be referred as compound) that dissociates with the acid-hatching of young eggs to carry out centrifugation, obtain the diamond concentrate then after filtration.Used separating medium is all reusable, and attached to a small amount of J-10 medium of diamond surface, available water washes, and can reuse after dehydration.
2, claim 1 said heavy separating medium J-10, be a kind of can and water (water can be used running water, but the uses the distilled water effect better) heavy-fluid of preparation by a certain percentage.
3, said centrifugal classification in the claim 1 is after the compound behind separating medium J-10 and the ball milling is mixed by a certain percentage, to put centrifuge into and carry out centrifugal layering.Its optimal proportion is that 100 gram compounds add 200 milliliters of J-10 heavy-fluids.
4, said isolated by filtration in the claim 1 is meant that the suction system that both can adopt vavuum pump to be connected with glass sand hourglass finishes; Also can directly use filter to finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86100026 CN86100026A (en) | 1986-01-07 | 1986-01-07 | Diamond and graphite centrifugal classification new method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86100026 CN86100026A (en) | 1986-01-07 | 1986-01-07 | Diamond and graphite centrifugal classification new method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86100026A true CN86100026A (en) | 1987-09-30 |
Family
ID=4800859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86100026 Pending CN86100026A (en) | 1986-01-07 | 1986-01-07 | Diamond and graphite centrifugal classification new method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86100026A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109434009A (en) * | 2018-11-26 | 2019-03-08 | 湖南大学 | A kind of environment-friendly type graphite lubrication release agent |
| CN109467081A (en) * | 2018-12-12 | 2019-03-15 | 中国恩菲工程技术有限公司 | The method of serialization separation diamond and graphite |
| CN113916713A (en) * | 2021-09-28 | 2022-01-11 | 苏州中材非金属矿工业设计研究院有限公司 | Separation and determination method of graphite impurities |
-
1986
- 1986-01-07 CN CN 86100026 patent/CN86100026A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109434009A (en) * | 2018-11-26 | 2019-03-08 | 湖南大学 | A kind of environment-friendly type graphite lubrication release agent |
| CN109434009B (en) * | 2018-11-26 | 2020-07-21 | 湖南大学 | Environment-friendly graphite lubricating release agent |
| CN109467081A (en) * | 2018-12-12 | 2019-03-15 | 中国恩菲工程技术有限公司 | The method of serialization separation diamond and graphite |
| CN113916713A (en) * | 2021-09-28 | 2022-01-11 | 苏州中材非金属矿工业设计研究院有限公司 | Separation and determination method of graphite impurities |
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