International name: Сalcium Nitrate Synonyms: calcium nitrate, calcium nitrate

Chemical formula: Ca (NO3) 2

Appearance: colorless crystals with a cubic lattice

Production: Poland, Slovakia

Packaging and storage: bag 25 kg; up to 1 year

Description

Calcium nitrate (anhydrous salt) - colorless crystals with a cubic lattice. Inorganic salt of nitric acid.
Calcium nitrate in the form of anhydrous salt and crystalline hydrates of calcium nitrate is strongly hygroscopic, so it is stored without access to moisture. Blurs in the air. To reduce hygroscopicity, the crystalline salt is mixed with hydrophobic additives. Improvement of the physical properties of calcium nitrate is achieved by adding to its concentrated solution in the production process 4-7% ammonium nitrate. Granular forms of calcium nitrate with the addition of ammonium nitrogen retain all the positive qualities of anhydrous salt and crystalline hydrates. This reduces the hygroscopicity of the fertilizer and increases the mass fraction of nitrogen in the fertilizer composition. Calcium nitrate is a source of nitrogen for plants during the growing season. The use of this fertilizer contributes to the improvement of growth, resistance to various unfavorable factors and an increase in the yield of almost all cultivated plants. It is good to use this fertilizer for top dressing of winter crops, tilled crops and other crops. Fertilizer is also ideally suited for presowing implantation, since nitrogen is essential for crops at the initial stage of their development, which is absorbed only by calcium. Calcium nitrate is also introduced at the beginning of vegetation, by foliar dressing.

Properties

The density is 2.36 g / cm3. Anhydrous salt melts at a temperature of 561 ° C. At a temperature of 500 ° C, decomposition begins with the release of O2 and the formation of calcium nitrate Ca (NO2) 2, which then decomposes into CaO and NO2. At temperatures up to 42.7 ° C crystallizes into a four-aqueous crystalline hydrate, above 54.6 ° C is anhydrous calcium nitrate.
Solubility in water: o at 20 ° C - 56.3%, o at 51.6 ° C ° C - 78.2%. [3] Both the anhydrous salt and the crystalline hydrates of calcium nitrate are highly hygroscopic and spread out in the air. The vapor pressure above the 50% solution of calcium nitrate in the temperature range from 70 to 110 ° C rises from 135 to 730 mm Hg. st, and above 75% solution in the range of 90-140 ° C increases from 90 to 740 mm Hg. Art. A solution of 77.9% concentration of Ca (NO3) 2 boils at 143.3 ° C under normal pressure and at 117 ° C under a pressure of 300 mm Hg. article

Getting Calcium nitrate is obtained as a by-product in the production of nitric acid from ammonia by saturation of limestone milk with nitric gases, and also, in the production of complex fertilizers by the method of nitric acid decomposition of phosphate raw materials. Reduction of hygroscopicity is achieved by the addition of hydrophobic constituents (gypsum, paraffin oil). The physical properties of the fertilizer are increased by adding 4-7% of ammonium nitrate. Granular calcium nitrate is obtained by adding a small amount (4-7%) of ammonium nitrate to a pre-evaporated solution of high-concentration calcium nitrate followed by granulation (

Getting
  • In agriculture, calcium nitrate is used as pre-sowing fertilizer and dressing of various vegetable, fruit and ornamental crops.
  • In construction, it is used as an additive in concrete to slow down the corrosion process placed in concrete steel, as a curing accelerator, and also to increase strength.
  • In the food industry, calcium nitrate serves to prepare brine in refrigeration.
  • In the chemical industry, calcium nitrate is used in the manufacture of various reagents. It is one of the components in the production of explosives.

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