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硝酸钾系烟用 NPK复肥是市场上畅销的品种 ,目前国内厂家都用硝酸钾、磷铵及硝铵等团粒而成 ,这种工艺的缺点是团粒颗粒强度低 ,成本亦较高。采用硝酸磷肥法制成的硝酸钾系复肥 ,既充分利用了硝酸的化学能分解磷矿 ,得到所需的 P2 O5,又能发挥硫酸钾中的硫酸根沉淀水溶性的 Ca O,并通过喷浆涂布造粒 ,得到物理性质良好的复合肥料。本文着重介绍硝酸磷肥法制硝酸钾系复肥的原理、工艺技术与产品的方案 ,并进行分离与不分离石膏 2种方案的比较 ,推荐并介绍不分离石膏法的工艺流程、主要设备与物料平衡。最后 ,介绍 10万吨 /年硝酸磷肥法复肥的投资估算以及与常规团粒法 10 15 15硝酸钾系烟用 NPK复肥的财务成本比较
Potassium nitrate based NPK compound fertilizer is a best-selling product in the market. At present, domestic manufacturers are made of agglomerates such as potassium nitrate, ammonium phosphate and ammonium nitrate. The disadvantage of this process is the low strength and high cost of aggregate particles. The use of nitric acid phosphate made of potassium nitrate compound fertilizer, not only make full use of the chemical decomposition of nitric acid phosphate, to obtain the required P2 O5, potassium sulfate can also play a role in the precipitation of water-soluble CaO, and by spraying Pulp coating granulation, get a good physical properties of compound fertilizers. This article focuses on the principle of nitric acid phosphate fertilizer system of potassium nitrate compound, the technology and product programs, and the separation and separation of gypsum without comparison of two programs, recommend and introduce the separation of gypsum process, the main equipment and material balance . Finally, the introduction of 100,000 tons / year nitrophosphate fertilizer compound fertilizer investment estimates and the conventional method of aggregate 15-15 15 potassium nitrate Department of tobacco NPK compound with the financial cost