| 摘要 |
<p>The fertiliser is made by (a) treating phosphate mineral with nitric acid to form an acid paster contg. nitrogenated cpds. and soluble phosphate cpds.; (b) feeding the acid paste into a mixing chamber; (c) mixing with an ammoniating agent and using the reaction heat developed to evaporate any liq. present; and (d) during ammoniation, adding sufficient sulphuric acid to inhibit reversion of soluble phosphate cpds. to insol. cpds. (0/1)</p> |
