Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B25/00—Phosphorus; Compounds thereof
  • C01B25/16—Oxyacids of phosphorus; Salts thereof
  • C01B25/18—Phosphoric acid
  • C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
• • 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
  • 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

Definitions

• the present invention relates to a process of decomposing water-insoluble phosphates.
• the calcium nitrate is separated in a specially well crystallised form by adding to the nitric acid, to the crude phosphate or to the mixture of both in which decomposition takes place, an amount of ammonium nitrate and/or potassium nitrate suflicient for the formation of the known calcium-ammonium nitrate or calcium-potassium nitrate double salts. It is especially suitable to maintain a temperature of from about to 25 C. during the decomposition.
• Example 1000 parts of Morocco phosphate are intro- In Germany April 7, 1938 quizzed at a temperature of 21 G. into 2000 parts of 65 per cent nitric acid in which 150 parts of ammonium nitrate are dissolved. While the crude phosphate is still being introduced, there begins the separation of the calcium-ammonium nitrate double salt which is completed a short time after all phosphate has been introduced In this way 1300 parts of well crystallised, readily filterable double salt having a content of 1..- per cent of ammonia-nitrogen are obtained.
• the improvement which comprises adding at any stage of the reaction at least one of the compounds ammonium nitrate and potassium nitrate in an amount sufficient for the formation of at least one of the known double salts calcium-ammonium nitrate and calcium-potassium nitrate, the crystallization of the calcium nitrate thus taking place in the form of at least one of the said double salts.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Treating Waste Gases (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7992410

Family Applications (1)

Country Status (2)

• 0
  • NL NL50807D patent/NL50807C/xx active
• 1939
  • 1939-04-04 US US265934A patent/US2252281A/en not_active Expired - Lifetime

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