IE36075B1 - Separation of diamonds by electro-magnetic radiation - Google Patents

Separation of diamonds by electro-magnetic radiation

Info

Publication number
IE36075B1
IE36075B1 IE163/72A IE16372A IE36075B1 IE 36075 B1 IE36075 B1 IE 36075B1 IE 163/72 A IE163/72 A IE 163/72A IE 16372 A IE16372 A IE 16372A IE 36075 B1 IE36075 B1 IE 36075B1
Authority
IE
Ireland
Prior art keywords
diamonds
spectra
spectral
luminescence
feb
Prior art date
Application number
IE163/72A
Other versions
IE36075L (en
Original Assignee
De Beers Cons Mines Ltd
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 De Beers Cons Mines Ltd filed Critical De Beers Cons Mines Ltd
Publication of IE36075L publication Critical patent/IE36075L/en
Publication of IE36075B1 publication Critical patent/IE36075B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/346—Sorting according to other particular properties according to radioactive properties

Landscapes

  • Analysing Materials By The Use Of Radiation (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

1384813 Uses of luminescence DE BEERS CONSOLIDATED MINES Ltd 10 Feb 1972 [12 Feb 1971] 6296/72 Heading C4S [Also in Division G1] Diamonds are sorted from a mixture by irradiating the mixture, detecting luminescence therefrom and dividing the diamonds into fractions in accordance with different spectral characteristics. The radiation may be γ-rays from a Co 60 source, X-rays from an X-ray tube or ultra violet radiation from a lamp which may require a u.v. filter. A grating spectrometer provided with a choice of photomultipliers to cover the full spectral range, or a plurality of filters, may be used for the spectral analysis. Characteristics which may be used in combination may be the unique spectra of the different types of diamonds and common impurities (spectral signatures), ratios of different parts of the spectra or decay characteristics. A compressed air blast sorter may be used on a single particle stream on a conveyer belt or freely falling. Various examples of luminescence characteristic spectra are provided (not shown) for four types of diamond, zircon and fluorite, at room and liquid nitrogen temperatures. [GB1384813A]
IE163/72A 1971-02-12 1972-02-10 Separation of diamonds by electro-magnetic radiation IE36075B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA710900A ZA71900B (en) 1971-02-12 1971-02-12 Separation of particles by electromagnetic radiation

Publications (2)

Publication Number Publication Date
IE36075L IE36075L (en) 1972-08-12
IE36075B1 true IE36075B1 (en) 1976-08-04

Family

ID=25563041

Family Applications (1)

Application Number Title Priority Date Filing Date
IE163/72A IE36075B1 (en) 1971-02-12 1972-02-10 Separation of diamonds by electro-magnetic radiation

Country Status (7)

Country Link
BE (1) BE779176A (en)
GB (1) GB1384813A (en)
IE (1) IE36075B1 (en)
IL (1) IL38744A (en)
NL (1) NL7201821A (en)
OA (1) OA04073A (en)
ZA (1) ZA71900B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429624A1 (en) * 1978-06-27 1980-01-25 Andrianavalontsalama Castel Ca Machine for sorting quartz rock - has laser which produces specific radiation waves for detection and transformation into electrical impulses for controlling grader
GB8531330D0 (en) * 1985-12-19 1986-01-29 British Petroleum Co Plc Differentiation process
BE1002936A4 (en) * 1988-01-29 1991-09-03 Argyle Diamond Sales Ltd METHOD AND APPARATUS FOR SORTING AND / OR CONFIRMING THE IDENTIFICATION OF PRECIOUS STONES.
US5206699A (en) * 1988-05-06 1993-04-27 Gersan Establishment Sensing a narrow frequency band of radiation and gemstones
GB9417665D0 (en) * 1994-09-02 1994-10-19 Gersan Ets Distinguishing natural from synthetic diamond
US5932119A (en) 1996-01-05 1999-08-03 Lazare Kaplan International, Inc. Laser marking system
US6377340B1 (en) 1999-10-29 2002-04-23 General Electric Company Method of detection of natural diamonds that have been processed at high pressure and high temperatures
GB201511461D0 (en) * 2015-06-30 2015-08-12 Beers Uk De Ltd Luminescence measurements in diamond
GB201622314D0 (en) * 2016-12-28 2017-02-08 Beers De Uk Ltd Identification of mounted gemstones

Also Published As

Publication number Publication date
BE779176A (en) 1972-05-30
IL38744A (en) 1975-04-25
GB1384813A (en) 1975-02-26
IL38744A0 (en) 1972-04-27
IE36075L (en) 1972-08-12
NL7201821A (en) 1972-08-15
ZA71900B (en) 1972-08-30
OA04073A (en) 1979-10-30

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