Abstract
The conditions of preparation of diferrous cyclo-tetraphosphate (tetrametaphosphate) have been followed by thermal decomposition (dehydration) of the phosphorus compound obtained from a mixture of iron and phosphoric acid. The methods of non-isothermal TA and analysis of the calcinates prepared under the same conditions in an electric furnace have been used to determine the temperatures of the individual dehydration and condensation reactions, the temperature regions of the existence of intermediates, and the conversion degree of the calcinate into the final product. It has been shown that the reactions are affected in a distinctly favourable way by increased water vapour pressure in the area of the products being formed.
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