Abstract Agricultural ammonium nitrate(ANP) is one of the main raw materials for the production of AN-based compound fertilizer. The IV-III phase transition of ammonium nitrate(AN) is one of the main reasons for the caking of AN-based compound fertilizer(NPK). Potassium salts used for the production of compound fertilizers are usually K2SO4(KS). In this paper KNO3(KN) was added to improve the anti-caking properties of AN-based NPK. The IV-III phase transition of ANP and the effects of KN, KS, NH4SO4(NS), and NH4H2PO4(NP) on the solid phase transitions of ANP was investigated by differential scanning calorimetry (DSC) and powder X-ray diffractometer(XRD). The results showed that the phase transformation inhibition effect of KN and KS on ANP was better than that of NS and NP. In this experiment, KN was used to replace part of KS in the formula of AN-based NPK, and the granular fertilizer with different contents of KN were prepared, the anti caking properties and hygroscopicity of the fertilizer were tested. The results showed that although the content of potassium in the compound fertilizer remained unchanged, with the increase of the content of KN and the decrease of the content of KS in the formula, the anti-caking performance and hygroscopicity of the AN-based NPK were obviously improved.

中文翻译：

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硝酸钾对AN基NPK颗粒复合肥抗结块性能的影响

摘要 农用硝酸铵(ANP)是生产AN基复合肥的主要原料之一。硝酸铵(AN)的IV-III相变是AN基复合肥(NPK)结块的主要原因之一。用于生产复合肥料的钾盐通常是K2SO4(KS)。在本文中，添加 KNO3(KN) 以提高 AN 基 NPK 的抗结块性能。采用差示扫描量热法(DSC)和粉末X射线衍射仪(XRD)研究了ANP的IV-III相转变以及KN、KS、NH4SO4(NS)和NH4H2PO4(NP)对ANP固相转变的影响）。结果表明，KN和KS对ANP的相变抑制作用优于NS和NP。在这个实验中，在AN基NPK配方中用KN代替部分KS，制备了不同KN含量的颗粒肥料，测试了肥料的抗结块性能和吸湿性。结果表明，虽然复混肥中钾的含量保持不变，但随着配方中KN含量的增加和KS含量的降低，AN基NPK的抗结块性能和吸湿性有所提高。明显改善。