GB1394734A - Process for the purification of waste product calcium sulphate - Google Patents

Process for the purification of waste product calcium sulphate

Info

Publication number
GB1394734A
GB1394734A GB1948972A GB1948972A GB1394734A GB 1394734 A GB1394734 A GB 1394734A GB 1948972 A GB1948972 A GB 1948972A GB 1948972 A GB1948972 A GB 1948972A GB 1394734 A GB1394734 A GB 1394734A
Authority
GB
United Kingdom
Prior art keywords
calcium sulphate
purification
radioactivity
waste product
product calcium
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
Application number
GB1948972A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unie Van Kunstmestfabrieken BV
Original Assignee
Unie Van Kunstmestfabrieken BV
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 Unie Van Kunstmestfabrieken BV filed Critical Unie Van Kunstmestfabrieken BV
Priority to GB1948972A priority Critical patent/GB1394734A/en
Priority to NL7305679A priority patent/NL7305679A/xx
Priority to DE2320645A priority patent/DE2320645A1/en
Priority to BE130344A priority patent/BE798628A/en
Priority to FR7314787A priority patent/FR2182002B1/fr
Publication of GB1394734A publication Critical patent/GB1394734A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C01F11/468—Purification of calcium sulfates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

1394734 Purification of calcium sulphate UNIE VAN KUNSTMESTFABRIEKEN BV 25 April 1973 [26 April 1972] 19489/72 Heading C1A Waste product calcium sulphate is purified to decrease its radioactivity by classification according to particle size by using a hydrocyclone or curved screening deck and monitoring the radioactivity of the feed and various fractions, and removing the finer fraction or fractions, whereby the contaminants and also radioactivity, concentrated in the smaller particles are also removed. The waste calcium sulphate is preferably in aqueous suspension.
GB1948972A 1972-04-26 1972-04-26 Process for the purification of waste product calcium sulphate Expired GB1394734A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB1948972A GB1394734A (en) 1972-04-26 1972-04-26 Process for the purification of waste product calcium sulphate
NL7305679A NL7305679A (en) 1972-04-26 1973-04-24
DE2320645A DE2320645A1 (en) 1972-04-26 1973-04-24 METHOD FOR PURIFYING WASTE CALCIUM SULFATE
BE130344A BE798628A (en) 1972-04-26 1973-04-24 PROCESS FOR PURIFYING THE CALCIUM SULPHATE OBTAINED AS RESIDUE
FR7314787A FR2182002B1 (en) 1972-04-26 1973-04-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1948972A GB1394734A (en) 1972-04-26 1972-04-26 Process for the purification of waste product calcium sulphate

Publications (1)

Publication Number Publication Date
GB1394734A true GB1394734A (en) 1975-05-21

Family

ID=10130219

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1948972A Expired GB1394734A (en) 1972-04-26 1972-04-26 Process for the purification of waste product calcium sulphate

Country Status (5)

Country Link
BE (1) BE798628A (en)
DE (1) DE2320645A1 (en)
FR (1) FR2182002B1 (en)
GB (1) GB1394734A (en)
NL (1) NL7305679A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146568A (en) 1977-08-01 1979-03-27 Olin Corporation Process for reducing radioactive contamination in waste product gypsum
EP0041758A1 (en) * 1980-06-11 1981-12-16 Chemische Werke Hüls Ag Process for the reduction of radioactivity of calcium sulphate produced from phosphorite
EP0054993A1 (en) * 1980-12-20 1982-06-30 Stamicarbon B.V. Process for the recovery of practically radium-free calcium sulphate, yttrium and lanthanides
US4388292A (en) * 1981-12-14 1983-06-14 United States Gypsum Company Process for reducing radioactive contamination in phosphogypsum
US4421731A (en) * 1982-09-29 1983-12-20 United States Gypsum Company Process for purifying phosphogypsum
FR2529190A1 (en) * 1982-06-29 1983-12-30 United States Gypsum Co PROCESS FOR PRODUCING LOW RADIO-ACTIVE CONTAMINATION CALCIUM SULFATE
WO1994013845A1 (en) * 1991-07-01 1994-06-23 Sovmestnoe Rossiisko-Shvedskoe Predpriyatie 'horos' Process for extracting rare-earth elements from phosphate ore

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE563616A (en) * 1956-12-31
DE1235211B (en) * 1965-07-06 1967-02-23 Giulini Gmbh Geb Process for the production of plaster of paris from calcium sulphate dihydrate resulting from the production of phosphoric acid
GB1202893A (en) * 1967-02-09 1970-08-19 Fisons Ltd Calcium sulphate hemihydrate

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146568A (en) 1977-08-01 1979-03-27 Olin Corporation Process for reducing radioactive contamination in waste product gypsum
EP0041758A1 (en) * 1980-06-11 1981-12-16 Chemische Werke Hüls Ag Process for the reduction of radioactivity of calcium sulphate produced from phosphorite
EP0054993A1 (en) * 1980-12-20 1982-06-30 Stamicarbon B.V. Process for the recovery of practically radium-free calcium sulphate, yttrium and lanthanides
US4388292A (en) * 1981-12-14 1983-06-14 United States Gypsum Company Process for reducing radioactive contamination in phosphogypsum
WO1983002111A1 (en) * 1981-12-14 1983-06-23 United States Gypsum Co Process for reducing radioactive contamination in phosphogypsum
FR2529190A1 (en) * 1982-06-29 1983-12-30 United States Gypsum Co PROCESS FOR PRODUCING LOW RADIO-ACTIVE CONTAMINATION CALCIUM SULFATE
US4424196A (en) 1982-06-29 1984-01-03 United States Gypsum Company Phosphohemihydrate process for purification of gypsum
US4421731A (en) * 1982-09-29 1983-12-20 United States Gypsum Company Process for purifying phosphogypsum
WO1994013845A1 (en) * 1991-07-01 1994-06-23 Sovmestnoe Rossiisko-Shvedskoe Predpriyatie 'horos' Process for extracting rare-earth elements from phosphate ore

Also Published As

Publication number Publication date
FR2182002A1 (en) 1973-12-07
DE2320645A1 (en) 1973-11-08
FR2182002B1 (en) 1977-07-29
NL7305679A (en) 1973-10-30
BE798628A (en) 1973-10-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee