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介绍冷冻法硝酸磷肥硝钙转化过程的化学反应机理、ｍ（ＮＨ３）／ｍ（ＣＯ２）比和ＣＯ２质量分数的确定，分析硝钙转化过程的影响因素，并提出生产控制要点。
The chemical reaction mechanism, the ratio of m (NH3) / m (CO2) and the mass fraction of CO2 were introduced. The influencing factors of conversion process of nitrocalcium were analyzed and the main points of production control were put forward.