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The composition, solubility, and hygroscopicity of the solids, the stability of their solutions, and their tendencies to undergo hydrolysis, as influenced by the CaOuPsOs ratio and by silica content, were considered for both air-cooled and quenched materials.The comparative tendencies of P03 and PO4 to undergo fixation by the soil were also recorded. The determined values are considered to be useful as pilot information in the handling of the melts, in the requisite technic for the chemical analysis and evaluation of the final products, and for guidance in the planning of supplemental Neubauer, pot, and agronomic studies.Composition and Solubility of Semi-com-mercial Calcium MetaphosphatesThe compositions of four of the products studied are indicated by the detailed analyses of Table I. Product 443-A, of high silica content, was the most acidic and most soluble of all the air-cooled products of this and subsequent tables. The data show that the products are essentially calcium metaphosphates and that all products contained P08 in excess of the CaO:P2Os ratio that would be accounted for by the respective CaO contents.The solubility results of Table II were obtained from agitated extractions of 5-gram charges of 100-mesh products per liter of solvent for periods of 1, 20, 24, and 48 hours at room temperature. Only limited hydrolysis was induced by the acid content of the precipitant solution. The marked

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