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Aluminium dihydrogenphosphate describes inorganic compounds with the formula Al(H 2 PO 4) 3. xH 2 O where x = 0 or 3. They are white solids. Upon heating these materials convert sequentially to a family of related polyphosphate salts including aluminium triphosphate (AlH 2 P 3 O 10. 2H 2 O), aluminium hexametaphosphate (Al 2 P 6 O 18), and aluminium tetrametaphosphate (Al 4 (P 4 O 12) 3).
Aluminium phosphate is a chemical compound. In nature it occurs as the mineral berlinite. [3] Many synthetic forms of aluminium phosphate are known. They have framework structures similar to zeolites and some are used as catalysts, ion-exchangers or molecular sieves. [4] Commercial aluminium phosphate gel is available.
Monopotassium phosphate can exist in several polymorphs.At room temperature it forms paraelectric crystals with tetragonal symmetry. Upon cooling to −150 °C (−238 °F) it transforms to a ferroelectric phase of orthorhombic symmetry, and the transition temperature shifts up to −50 °C (−58 °F) when hydrogen is replaced by deuterium. [8]
Solid monoammonium phosphate can be considered stable in practice for temperatures up to 200 °C, when it decomposes into gaseous ammonia NH 3 and molten phosphoric acid H 3 PO 4. [9] At 125 °C the partial pressure of ammonia is 0.05 mm Hg. [10] A solution of stoichometric monoammonium phosphate is acidic (pH 4.7 at 0.1% concentration, 4.2 at ...
Residual HF typically reacts with silicate minerals co-mingled with the phosphate ores to produce hexafluorosilicic acid (H 2 SiF 6). 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.
Aluminium diethyl phosphinate has also been investigated in projects of the US EPA Design for Environment (DfE) programme [15] and in the European FP7 research project Enfiro. [16] With the exception of being persistent and thus not readily biodegradable, aluminium diethyl phosphinate has been shown to have a favourable environmental and health ...
Sodium aluminium phosphate (SAlP) describes the inorganic compounds consisting of sodium salts of aluminium phosphates. The most common SAlP has the formulas NaH 14 Al 3 (PO 4) 8 ·4H 2 O and Na 3 H 15 Al 2 (PO 4) 8. [1] These materials are prepared by combining alumina, phosphoric acid, and sodium hydroxide. [2]
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