Superphosphate

Monocalcium phosphate is an inorganic compound with the chemical formula Ca(H2PO4)2 ("ACMP" or "CMP-A" for anhydrous monocalcium phosphate). It is commonly found as the monohydrate (""MCP" or "MCP-M"), Ca(H2PO4)2·H2O (CAS# 10031-30-8).

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Detailed Description for Superphosphate

Monocalcium phosphate is an inorganic compound with the chemical formula Ca(H2PO4)2 ("ACMP" or "CMP-A" for anhydrous monocalcium phosphate). It is commonly found as the monohydrate (""MCP" or "MCP-M"), Ca(H2PO4)2·H2O (CAS# 10031-30-8). Both salts are colourless solids. They are used mainly as superphosphate fertilizers and are also popular leavening agents.

Material of relatively high purity, as required for baking, is produced by treating calcium hydroxide with phosphoric acid:

Ca(OH)2 + 2 H3PO4 → Ca(H2PO4)2 + 2 H2O

Samples of Ca(H2PO4)2 tends to convert to dicalcium phosphate:

Ca(H2PO4)2 → Ca(HPO4) + H3PO4

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE White crystals
MELTING POINT  
BOILING POINT  
SPECIFIC GRAVITY 2.2
SOLUBILITY IN WATER 2 (g/100g)
pH  
VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

 

FLASH POINT Not considered to be a fire hazard
STABILITY Stable under ordinary conditions

 

Item Standard
Total P2O5 46% min
Available  P2O5 44% min
Water Soluble P2O5 37% min
Moisture 4.0% max
Free Acid 5.0% max
Size (2-5mm) pass 90% min

 

Superphosphate fertilizers are produced by treatment of "phosphate rock" with acids. Using phosphoric acid, fluorapatite is converted to Ca(H2PO4)2:

Ca5(PO4)3F + 7 H3PO4 → 5 Ca(H2PO4)2 + HF

This solid is called triple superphosphate. Several million tons are produced annually for use as fertilizers. Residual HF typically reacts with silicate minerals co-mingled with the phophate ores to produce hydrofluorosilicic acid (H2SiF6). The majority of the hexafluorosilicic acid is converted to aluminium fluoride and cryolite for the processing of aluminium.[1] These materials are central to the conversion of aluminium ore into aluminium metal.

When sulfuric acid is used, the product contains phosphogypsum ( CaSO4·2H2O) and is called single superphosphate.

 

 Application:

  - Improve the soil composition

  - Increase soil nutrients

  - Increase crop yield

  - Improve crop quality

  - Accelerate the cereal crops tillering and promoting grain full


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