贵溪化肥厂采用磷铵料浆氨化造粒法生产三元复合肥，液封槽洗涤液的中和度是生产过程控制的重要指标，工艺要求洗涤液校正中和度控制在０．８以下，但生产时分析测得的校正中和度经常出现负值。本文对校正中和度小于零的原因分析如下。中和度（ＭＲ）＝总ｎ（ＮＨ３）总ｎ... Guixi Chemical Fertilizer Plant production of ammonium phosphate granulation ternary compound fertilizer, liquid seal tank washing liquid and the degree of neutralization is an important indicator of the production process control, the process requires washing liquid correction and neutralization degree of control in 0.8 The following, but the production of the measured calibration neutrality often negative. The reason why the correction degree of neutrality is less than zero in this paper is as follows. Neutralization degree (MR) = Total n (NH3) Total n