GB768040A - Improvements in or relating to the crystallisation of nitrates from nitric acid solutions of calcium phosphate - Google Patents

Improvements in or relating to the crystallisation of nitrates from nitric acid solutions of calcium phosphate

Info

Publication number
GB768040A
GB768040A GB31845/54A GB3184554A GB768040A GB 768040 A GB768040 A GB 768040A GB 31845/54 A GB31845/54 A GB 31845/54A GB 3184554 A GB3184554 A GB 3184554A GB 768040 A GB768040 A GB 768040A
Authority
GB
United Kingdom
Prior art keywords
crystals
solution
nitric acid
nitrate
calcium phosphate
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
GB31845/54A
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.)
Norsk Hydro Elektrisk Kvaelstof AS
Original Assignee
Norsk Hydro Elektrisk Kvaelstof AS
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 Norsk Hydro Elektrisk Kvaelstof AS filed Critical Norsk Hydro Elektrisk Kvaelstof AS
Publication of GB768040A publication Critical patent/GB768040A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C5/00—Fertilisers containing other nitrates
    • C05C5/005—Post-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/18—Nitrates of ammonium
    • 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
    • C01F11/44—Concentrating; Crystallisating; Dehydrating; Preventing the absorption of moisture or caking
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
    • C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
    • C05B11/06—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using nitric acid (nitrophosphates)
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C1/00—Ammonium nitrate fertilisers
    • C05C1/02—Granulation; Pelletisation; Stabilisation; Colouring

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Removal Of Specific Substances (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

A process for the crystallization of calcium nitrates by cooling a solution obtained by treating impure calcium phosphate with nitric acid, which solution may also contain an ammonium salt, and separation of the nitrate crystals from the mother lye and finely divided impurities contained therein by straining through a coarse-meshed filtering cloth, is characterized in that the solution is cooled in batches and the crystallization in each batch is nitiated by the addition of seed crystals mainly comprising calcium nitrate, when the solution is between 2 DEG and 10 DEG C. below the saturation temperature, whereby the main body of crystals produced has a granular size less than 2 m.m., while at least 80 per cent by weight of the crystals produced have a granular size between 0.5 and 1.5 m.m., preferably between 0.5 and 1.0 m.m. The raw calcium phosphate is dissolved in nitric acid containing 50 to 65 per cent by weight HNO3, and nitrate of lime dust added, preferably when the temperature is 4 DEG to 7 DEG C. below the saturation temperature. The average granular size of the crystals may be regulated by varying the number of grains of seed crystals added. The solution is moderately stirred during cooling to keep the crystals formed suspended, and the suspension is then filtered through a filter cloth having a mesh of 0.3 to 0.5 m.m., which permits the finely divided insoluble impurities to pass through with the mother lye, and retains the crystals formed. By the process crystals of calcium nitrate tetrahydrate, and, when the nitric acid used contains ammonium nitrate, crystals of 5 Ca(NO3)2.NH4 NO3.10H2O, are obtained. Examples are given of processes within, and, for comparison, outside the invention.
GB31845/54A 1953-11-05 1954-11-03 Improvements in or relating to the crystallisation of nitrates from nitric acid solutions of calcium phosphate Expired GB768040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO768040X 1953-11-05

Publications (1)

Publication Number Publication Date
GB768040A true GB768040A (en) 1957-02-13

Family

ID=19906972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31845/54A Expired GB768040A (en) 1953-11-05 1954-11-03 Improvements in or relating to the crystallisation of nitrates from nitric acid solutions of calcium phosphate

Country Status (4)

Country Link
BE (1) BE533101A (en)
DE (1) DE953977C (en)
FR (1) FR1111495A (en)
GB (1) GB768040A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004039722A1 (en) * 2002-11-01 2004-05-13 Yara International Asa Method for production of nitrate-containing products from undercooling melts
US10369493B2 (en) * 2012-09-11 2019-08-06 Cap Iii B.V. Process for initiating an ammonium sulfate crystallization process
WO2020074883A1 (en) * 2018-10-08 2020-04-16 Sunamp Limited Metal nitrate based compositions for use as phase change materials
CN116395730A (en) * 2023-03-22 2023-07-07 承德莹科精细化工股份有限公司 Preparation method of high-purity calcium carbonate and calcium nitrate tetrahydrate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8300816A (en) * 1983-03-07 1984-10-01 Unie Van Kunstmestfab Bv METHOD FOR SEPARATING CALCIUM NITRATE TETRAHYDRATE BY CRYSTALLIZATION

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR682423A (en) * 1928-10-27 1930-05-27 Odda Smelteverk Aktieselskap Process for converting natural phosphates into soluble compounds and for separating the lime and phosphoric acid contained therein
DE573284C (en) * 1928-10-27 1933-03-29 Erling Johnson Process for the production of calcium nitrate and phosphoric acid or nitrogen and phosphoric acid dueners
DE549539C (en) * 1929-09-28 1932-04-28 Erling Johnson Process for the production of concentrated fertilizers
DE559073C (en) * 1929-10-28 1932-09-15 Erling Johnson Process for removing insoluble impurities when dissolving rock phosphate in nitric acid
DE650344C (en) * 1931-11-21 1937-09-21 Norsk Hydro Elek Sk Kvaelstofa Process for the separate production of calcium-containing fertilizers and phosphoric acid or phosphate fertilizers
DE675823C (en) * 1932-05-12 1939-05-17 Norsk Hydro Elek Sk Kvaelstofa Process for the separate production of calcium-containing fertilizers and phosphoric acid or Phosphate fertilizers
DE631234C (en) * 1932-05-21 1936-06-16 Norsk Hydro Elek Sk Kvaelstofa Process for the production of fertilizers
DE641761C (en) * 1934-02-07 1937-02-18 Erling Johnson Process for the production of phosphate fertilizers in a uniformly grained form
DE677966C (en) * 1937-06-27 1939-07-06 I G Farbenindustrie Akt Ges Digestion of phosphates
DE697373C (en) * 1938-04-08 1940-10-12 I G Farbenindustrie Akt Ges Process for digesting phosphates
DE702607C (en) * 1938-11-02 1941-02-12 Meyer Fa Rud Otto Device to prevent and eliminate crystal deposits on overflow pipes
DE822994C (en) * 1939-06-03 1951-11-29 Norsk Hydro Elek Sk Kvaelstofa Process for the production of multi-component fertilizers
DE727142C (en) * 1939-07-09 1942-10-28 Ig Farbenindustrie Ag Process for digesting rock phosphates
DE858831C (en) * 1942-06-11 1952-12-08 Georg Alexander Krause Dr H C Method and device for the treatment of moist or liquid substances at two or more different temperatures
US2540083A (en) * 1945-12-29 1951-02-06 Phillips Petroleum Co Continuous extractive crystallization process
DE812433C (en) * 1947-08-11 1951-08-30 Der Niederlaendische Staat Process for reducing the calcium nitrate content of a solution of rock phosphate in nitric acid, e.g. B. for the production of fertilizers
DE833822C (en) * 1949-08-23 1952-03-13 Farbwerke Hoechst Vormals Meis Process for the nitric acid digestion of rock phosphates with simultaneous recovery of calcium salt tetrahydrate and phosphoric acid or nitrogen-phosphoric acid fertilizers

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004039722A1 (en) * 2002-11-01 2004-05-13 Yara International Asa Method for production of nitrate-containing products from undercooling melts
EA008385B1 (en) * 2002-11-01 2007-04-27 Яра Интернэшнл Аса Method for production of nitrate-containing products from undercooling melts
US7500995B2 (en) 2002-11-01 2009-03-10 Yara International Asa Method for production of nitrate-containing products from undercooling melts
HRP20050374B1 (en) * 2002-11-01 2014-03-28 Yara International Asa Method for production of nitrate-containing products from undercooling melts
US10369493B2 (en) * 2012-09-11 2019-08-06 Cap Iii B.V. Process for initiating an ammonium sulfate crystallization process
WO2020074883A1 (en) * 2018-10-08 2020-04-16 Sunamp Limited Metal nitrate based compositions for use as phase change materials
CN112888757A (en) * 2018-10-08 2021-06-01 松耐普有限公司 Composition based on metal nitrates for use as phase change material
US20210380860A1 (en) * 2018-10-08 2021-12-09 Sunamp Limited Metal nitrate based compositions for use as phase change materials
US11891561B2 (en) * 2018-10-08 2024-02-06 Sunamp Limited Metal nitrate based compositions for use as phase change materials
CN116395730A (en) * 2023-03-22 2023-07-07 承德莹科精细化工股份有限公司 Preparation method of high-purity calcium carbonate and calcium nitrate tetrahydrate

Also Published As

Publication number Publication date
DE953977C (en) 1956-12-13
BE533101A (en)
FR1111495A (en) 1956-02-27

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