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WO2008118024A4 - Method for purification of calsium nitrate and products made thereof - Google Patents

Method for purification of calsium nitrate and products made thereof Download PDF

Info

Publication number
WO2008118024A4
WO2008118024A4 PCT/NO2008/000116 NO2008000116W WO2008118024A4 WO 2008118024 A4 WO2008118024 A4 WO 2008118024A4 NO 2008000116 W NO2008000116 W NO 2008000116W WO 2008118024 A4 WO2008118024 A4 WO 2008118024A4
Authority
WO
WIPO (PCT)
Prior art keywords
flocculant
calcium nitrate
dispersion liquid
flocculation tank
flotation
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.)
Ceased
Application number
PCT/NO2008/000116
Other languages
French (fr)
Other versions
WO2008118024A3 (en
WO2008118024A2 (en
Inventor
Frank Robert Eriksen
Hans Kristian Austad
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.)
Yara International ASA
Original Assignee
Yara International ASA
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 Yara International ASA filed Critical Yara International ASA
Priority to ROA200900675A priority Critical patent/RO125377B1/en
Publication of WO2008118024A2 publication Critical patent/WO2008118024A2/en
Publication of WO2008118024A3 publication Critical patent/WO2008118024A3/en
Publication of WO2008118024A4 publication Critical patent/WO2008118024A4/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C01F11/36—Nitrates
    • C01F11/38—Preparation with nitric acid or nitrogen oxides
    • 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
    • C01F11/36—Nitrates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Removal Of Specific Substances (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Physical Water Treatments (AREA)

Abstract

The present invention relates to a method to produce purified calcium nitrate. Due to introduction of a centrifugation stage at an early stage in the process, sedimentation of water insoluble particles is prevented on a later stage of the process such that flotation can effectively be performed. Sand filtration finalizes the purification process of the present invention and thereby the amount of impurities in the liquor is surprisingly decreased. By this continuous method it is possible to achieve clearly purified calcium nitrate wherein the content of water insoluble particles is well below 150 ppm in solid calcium nitrate.

Claims

AMENDED CLAIMS received by the International Bureau on 13 January 2009(13.01.2009)
1. Method for production of purified calcium nitrate from a calcium nitrate melt comprising digesting apatite in acid (1), cooling and crystallizing the digested calcium nitrate liquor (3)3 filtrating calcium nitrate crystals (4), washing the filtrate with nitric acid and/or water (5), dissolving with water
(6), neutralizing with ammonia (7) and adding flocculant (8), characterized in that it also comprises centrifugation of the digestion liquor (2) before crystallization and flotation (9).
2. Method according to claim 1 , characterized in that it comprises sand filtration (10) after addition of the flocculant.
3. Method according to claim 1 or 2, characterized in that it is a continuous method.
4. Method according to any of the preceding claims, characterized in that centrifugation (2) is done with a decanter centrifuge.
5. Method according to any of the preceding claims, characterized in that the flocculant is an anionic flocculant.
6. Method according to any of the preceding claims, characterized in that addition of the flocculant (8) is done in an flocculation tank.
7. Method according to claim 6, characterized in that the velocity gradient in the flocculation tank is 100 - 150 and the residence time is from 8 to 12 minutes. 8. Method according to claims 6 or 7, characterized in that the flocculant is added in 2 portions, before and after the flocculation tank.
9. Method according to any of the preceding claims, characterized in that flotation (9) comprises as dispersion liquid. 10. Method according to claim 9, characterized in that the dispersion liquid is cold water saturated wjth air at 5 - 6.5 bar.
11. Method according to claim 9, characterized in that the dispersion liquid is recycled purified CN melt saturated with air at 5 - 6.5 bar.
2. Method according to any of claim 2 to 117 characterized in that the sand used for sand filtration (10) has a particle size of 1.2 to 2.0 mm.
PCT/NO2008/000116 2007-03-28 2008-03-28 Method for purification of calsium nitrate and products made thereof Ceased WO2008118024A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ROA200900675A RO125377B1 (en) 2007-03-28 2008-03-28 Process for obtaining calcium nitrate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20071631 2007-03-28
NO20071631A NO332007B1 (en) 2007-03-28 2007-03-28 Calcium nitrate purification process

Publications (3)

Publication Number Publication Date
WO2008118024A2 WO2008118024A2 (en) 2008-10-02
WO2008118024A3 WO2008118024A3 (en) 2008-12-31
WO2008118024A4 true WO2008118024A4 (en) 2009-02-26

Family

ID=39683934

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2008/000116 Ceased WO2008118024A2 (en) 2007-03-28 2008-03-28 Method for purification of calsium nitrate and products made thereof

Country Status (5)

Country Link
NO (1) NO332007B1 (en)
PT (1) PT2008118024W (en)
RO (1) RO125377B1 (en)
RU (1) RU2459765C2 (en)
WO (1) WO2008118024A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SK287816B6 (en) * 2007-07-09 2011-11-04 Duslo, A. S. Granulated water-soluble calcium-nitrous fertilizer and method for preparation thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL134893C (en) * 1967-06-29
NO162714C (en) * 1987-10-06 1990-02-07 Norsk Hydro As PROCEDURE FOR PURIFICATION OF CALCIUM NITRATE MELT / SOLUTION SEPARATED FROM THE MIXTURE PHASED ON DISSOLUTION OF RAA PHOSPHATE WITH NITROGEN ACID.
US5009792A (en) * 1989-10-24 1991-04-23 Norsk Hydro A.S. Method for clarifying aqueous salt solutions
RU2228906C1 (en) * 2003-05-19 2004-05-20 Открытое акционерное общество "Акрон" Method of refining calcium nitrate melt or solution
PL200842B1 (en) * 2004-09-16 2009-02-27 Adam Nawrocki Method for the manufacture of calcium nitrate

Also Published As

Publication number Publication date
RU2459765C2 (en) 2012-08-27
WO2008118024A3 (en) 2008-12-31
RU2009137487A (en) 2011-05-10
NO20071631L (en) 2008-09-29
RO125377A2 (en) 2010-04-30
PT2008118024W (en) 2010-07-02
WO2008118024A2 (en) 2008-10-02
RO125377B1 (en) 2015-10-30
NO332007B1 (en) 2012-05-21

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