It is an object of the present invention, therefore, to provide a nitric acid acidulation process for the production of phosphoric acid and phosphatic fertilizers. 2. While any inert gas may be employed, an oxygen-rich gas serves not only to recover the nitrogen values in question from the byproduct solids stream, but also tends to assure that the product gas stream comprises essentially nitric oxide, nitrogen dioxide, and excess oxygen. The product gases, comprising nitrogen oxides and oxygen, are particularly suitable for use in the formation of concentrated nitric acid. 1. Fluidization may be achieved by recycling a portion of the gaseous product of the decomposition upwardly through the decomposition zone at a bed fiuidizing velocity. Ammonia gas may be burned, for example, to form nitrogen oxides, e.g. For this reason, it is often convenient to recycle a portion of the product gas stream comprising nitrogen oxides for further passage upwardly through the decomposition zone as the iluidizing gas. The separation of these particles from the decomposition gases constitutes a difficult, but necessary, operation if the product gases are to be used in the manufacture of nitric acid. The final concentration in the irrigation water depends on the amount of nutrients in the stock solution, the injection ratio and the amount of nutrients used in the water. The product gases comprise generally nitrogen oxides. When the production of very concentrated nitric acid from the product gas stream is desired, it is preferable that the partial pressure of nitrogen oxides in the product gas stream be held as high as possible and that the ratio of water to nitrogen oxides be as low as possible. Calcium Nitrate is a good source of both Calcium and Nitrate. As previously indicated, the introduction of inerts such as nitrogen can be avoided by recycling a portion of the product gas stream as the fluidizing gas. The well known Odda process, and several variations thereof, provide for the nitric acid acidulation of phosphate rock and the crystallization and separation of the calcium nitrate formed during the acidulation. It is another object of the present invention to provide an improved calcium nitrate decomposition process. While the degree of agglomeration and particle growth will depend upon such factors as initial particle size distribution and the particular decomposition temperature, the results in Table III further demonstrate that a larger, more stable product is obtained in the fluidized bed decomposition process of the present invention. For example, calcium nitrate samples were decomposed in a fluid bed reactor maintained at decomposition temperature in accordance with the present invention. While a fluidized bed regenerator unit 17 was indicated, it is, of course, within the scope of the invention to provide any other convenient means for heating the recycle lime. No. After leaving dust collector cyclone 111, in which a large portion of the fines are removed therefrom, the product nitrogen gas stream may be passed through conventional electrosatic Cottrell precipitators or a conventional bag house, not shown, for removal of additional fines that may still be present in the gas stream. The nitric acid thus formed may thereafter be recycled to the original nitric acid acidulation operation in order to produce additional quantities of wet process phosphoric acid and by-product calcium nitrate that may be in accordance with the novel decomposition process of the present invention. Let’s see which one suits your needs. Its low analysis, however, prevents the economical transport of the cal cium nitrate over any considerable distance. 2Ca (NO3)2 = 2CaO + 4NO2 + O2. The bed may be maintained by recycling by-product lime formed during the thermal decomposition of the calcium nitrate. Because of these characteristics, three phases normally exist during thermal decomposition. Suflicient solids are recycled to supply the heat necessary for decomposition under fluid bed conditions. 2 is a diagrammatic illustration of the apparatus that may be employed for carrying out an alternate embodiment of the process herein described.