Abstract
By methods of pH monitoring of filtration solutions as well as due to determination of residual concentrations of ions Мg2+ and РО4 3- the bishofite–phosphate acid interaction was studied with the given ratio [РО4 3-]:[Мg2+] = 0,187–5,24. The precipitation arising from the reaction was studied by chemical, thermal gravimetric and X-ray phase analysis and its compliance with the formula xNH4MgPO4 • yMgHPO4 was established, where х = 0,25; у = 0,75.
Highlights
Bishofite [1] which main compound is magnesium chloride is used as an accessible and natural raw material in order to get ammonium magnesium phosphates of various composition during fertilizer [2], antipyrene [3] production and other production.It was described in [4] how these complex fertilizers in the form of NH4MgPO4 · хН2О were got
The detailed analysis of range of publications was presented in [2], and in [5,6,7], where it was informed about various synthesis conditions of ammonium magnesium phosphates as well as results of their study by means of thermal gravimetric and X-ray phase analysis
Compounds, X-ray characteristics as well as for interpretation of thermal gravimetric data on the basis of which some authors say that NH4MgPO4 is decomposed into NH3 and MgHPO4, and other authors ― into NH3, Н2О and Mg2P2O7 [2]; according to some researchers, this process is carried out because of composition of magnesium oxide and polyphosphates which compose Mg2P2O7 [7] at higher temperatures
Summary
Bishofite [1] which main compound is magnesium chloride is used as an accessible and natural raw material in order to get ammonium magnesium phosphates of various composition during fertilizer [2], antipyrene [3] production and other production. It was described in [4] how these complex fertilizers in the form of NH4MgPO4 · хН2О were got. This is true for chemical compounds, X-ray characteristics as well as for interpretation of thermal gravimetric data on the basis of which some authors say that NH4MgPO4 is decomposed into NH3 and MgHPO4, and other authors ― into NH3, Н2О and Mg2P2O7 [2]; according to some researchers, this process is carried out because of composition of magnesium oxide and polyphosphates which compose Mg2P2O7 [7] at higher temperatures.
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